Prof. Radek Zbořil, Ph.D.

Email: radek.zboril@upol.cz
Address:
Šlechtitelů 11, Olomouc, Czech Republic, 78371
Phone:
(+420) 58 563 4947
Fax: (+420) 58 563 4958

Tady bude neviditelný text – prázdná mezera

Tady bude neviditelný text – prázdná mezera

Tady bude neviditelný text – prázdná mezera

Professional
Born: 21. 5. 1973
2000 – Ph.D. degree
2001-2002 - Lecturer at Department of Inorganic and Physical Chemistry, Palacky University
2001-2003 – Lecturer at Department of Physical Chemistry, Palacky University
2006 – Associate professor in Physical Chemistry
2005-2010 – Scientific director of Centre for Research of Nanopowdered Materials 2010 – Professor in Physical Chemistry
2010 – General Director of Regional Centre of Advanced Technologies and Materials (http://www.rcptm.com/)
2010 – Professor in Physical Chemistry
Other activities
2011 - General Chairmen of the International Conference NANOCON (http://www.nanocon.cz/en/)
2010 - General Chairmen of the International Conference NANOCON (http://www.nanocon.cz/en/)
2010 – A member of the board of Technology Agency of the Czech Republic (http://www.tacr.cz/en/)

Research Activities:
Nanomaterial research – iron and iron oxide based nanoparticles, silver nanoparticles, carbon nanostructures, magnetic nanoparticles: synthesis, characterization, applications in catalysis, water treatment, antimicrobial treatment, medicine and biotechnologies.

 

Industrial applications:
2008 – Large scale technology for production of Zero Valent Iron nanoparticles (Fe(0), nZVI = nanoscale Zero Valent Iron) and their application in water treatment technologies. (http://www.nanoiron.cz/en/)

Foreign stays:
1998 – Institute of Materials Sciences, National Center for Scientific Research „Demokritos“, Athens, Greece (Prof. Petridis) – synthesis of magnetic nanoparticles for biomedicine
1998 – Wits University, Johannesburg, JAR (Dr. Mulaba) – pressure induced solid-state transformations
1999 – Company ThermoMicroscopes, the branch in Geneva – AFM training
2000 – Department of Physics, University of Ioannina, Greece (Prof. Papaefthymiou) – low temperature Mössbauer spectroscopy
2000 – Department of Physics and Astronomy, University of Delaware, USA (Prof. Hadjipanayis) – study of superparamagnetic materials
2000 – Graduate School of Engineering, University of Tokyo, (Prof. Nomura) – TEM training
2004 – Institute for Physical High Technology, Jena (Prof. Muller) – VSM magnetic measurements training

 

International Grant Projects: A leader and/or co-investigator of several international projects, e.g.:

  • Decontamination of chemical warfare agents by environmentally-friendly oxidants iron(IV) and iron (VI), NATO grant (CBP.EAP.CLG 983119), the multilateral (six partners) project coordinated by Florida Institute of Technology (USA). 2008-2009.
  • Iron oxide-based nanomaterials with the novel magnetic properties, synthesis, characterization and technological applications, MŠMT/ CZE03/013, 2004-2005, bilateral project with Institute for Physical High Technology, Jena.
  • Moessbauer investigation of nanostructured Fe-O particles, NATO grant HTECH. LG 973515, 1998-2000, thee-sided research project with University of Delaware (USA) and University of Ioannina(GR).
  • Mössbauer study of iron oxide nanoparticles MŠMT/ME600, 2002-2004, bilateral project with University of Tokyo, School of Engineering.
  • Surface stages of nanostructured materials, MŠMT/i.č.57, 2002-2004, bilateral project with Slovak Technical University in Bratislava.

A leader and/or co-investigator of more than 30 national projects.

Publication activities:

  • Author or co-author of more than 120 papers in international journals.
  • More than 1400 citations.
  • More than 20 contributions in books and international proceedings published e.g. by the American Chemical Society and American Institute of Physics.
  • Co-editor of the book: Mössbauer spectroscopy in Materials Science, eds. M. Mashlan, R. Zboril, American Institute of Physics, Melville, New York, 2008. ISBN 978-0-7354-0601-8.

Awards:
1998 – Prize of Minister of Education of the Czech Republic for the works in the field of thermal decomposition of ferrous sulfate heptahydrate
2011 – Award of the Minister of Education, Youth and Sport of the Czech Republic for extraordinary results achieved in the field of research, experimental development and innovations
 

Oral presentations, invited talks at world symposia and international conferences:
More than 20 oral presentations and/or invited talks at international conferences and symposia, e.g.:
2000 – International Symposium on the Industrial Applications of Mössbauer Effect- ISIAME 00, Virginia Beach, USA, August 13-18, 2000.
2001 – Asia-Pacific Symposium on Radiochemistry, APSORC 01, Fukuoka, Japan, October 30-November 2, 2001.
2002 – NATO Advanced Research Workshop on Material Research in Atomic Scale by Mössbauer Spectroscopy, Smolenice, Slovak Republic, June 1-6, 2002.
2003 – 10th International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials -ISMANAM03, Foz do Iguacu, Brasil, August 24-28, 2003.
2006 – 10th Castle Meeting on Paleo, Rock and Environmental Magnetism, Valtice, Czech Republic, September 3-8, 2006 (invited talk, participants from 25 countries) 2007 – International Conference on the Applications of the Mössbauer Effect – Kanpur, India, October 14-19,
2007 (invited talk, participants from more than 50 countries)
2008 – International Symposium on the Industrial Applications of Mössbauer Effect – ISIAME 08, Budapest, Hungary, August, 2008.

 

Top 10 publications:
1) R. Zboril; F. Karlicky; A. B.  Bourlinos; T. A. Steriotis; A. K. Stubos; V. Georgakilas; K. Safarova; D.  Jancik; C. Trapalis; M. Otyepka: Graphene Fluoride: A Stable Stoichiometric Graphene Derivative and Its Chemical Conversion to Graphene, Small 6 (2010) 2885-2891. IF09~6.171
2) K. Sivula; R. Zboril; F. Le Formal; R. Robert, A. Weidenkaff; J. Tucek; J. Frydrych; M. Grätzel: Photoelectrochemical Water Splitting with Mesoporous Hematite Prepared by a Solution-Based Colloidal Approach.  J. Am. Chem. Soc. 132 (2010) 7436-7444.  IF09~8.580 3) V. Georgakilas, A.B. Bourlinos, R. Zboril, T.A. Steriotis, P. Dallas, A.K. Stubos, C.Trapalis: Organic functionalisation of graphenes, Chem. Commun. 46 (2010) 1766-1768. IF09~5.504
4) K. Kluchova, R. Zboril et al.: Superparamagnetic maghemite nanoparticles from solid-state synthesis as peroral MRI contrast agent and carrier for trypsin immobilization, Biomaterials 30 (2009) 2855–2863.  IF09~7.365
5) A. Panacek, M. Kolar, R. Večeřova, R. Prucek, J. Soukupová, V. Krystof, P. Hamal, L. Kvitek, R. Zboril: Antifungal Activity of Silver Nanoparticles against Candida spp. Compared to E-test-Determined Activity of Conventional Antifungals, Biomaterials 30 (2009) 6333-6340. IF09~ 7.365
6) A.B. Bourlinos, V. Georgakilas, R. Zboril, T.A. Steriotis, A.K. Stubos: Liquid-phase exfoliation of graphite towards solubilized graphenes, Small 5 (2009) 1841-1845.  IF09~6.171
7) A. Bakandritsos, N. Bouropoulos, R. Zboril, K. Iliopoulos, N. Boukos, G. Chatzikyriakos, S. Couris: Optically active spherical polyelectrolyte brushes with a nanocrystalline magnetic core, Adv. Funct. Mater. 18 (2008) 1694-1706.  IF09~6.990
8) A.B. Bourlinos, A. Stassinopoulos, D. Anglos, R. Zboril, M. Karakassides, E.P. Giannelis: Surface functionalized carbogenic quantum dots, Small 4 (2008) 455-458.    IF09~6.171
9) V. Georgakilas, A.B. Bourlinos, R. Zboril, C. Trapalis: Synthesis, characterization and aspects of superhydrophobic functionalized carbon nanotubes, Chem. Mater. 20 (2008) 2884-2886.    IF09~5.368
10) M. Hermanek, R. Zboril, I. Medrik, J. Pechousek, C. Gregor: Catalytic efficiency of iron(III) oxides in decomposition of hydrogen peroxide: competition between surface area and crystallinity of nanoparticles, J. Am. Chem. Soc. 129 (2007) 10929-10936. IF09~8.580

Show publications

Publications

2011

  • [DOI] R. Herchel, Z. Travnicek, and R. Zboril, “Tuning of the Critical Temperature in Iron(II) Spin-Crossover Materials
    Based on Bridging Polycyanidometallates: Pentacyanidonitrosylferrate(II)
    and Hexacyanidoplatinate(IV),” INORGANIC CHEMISTRY, vol. 50, iss. 24, pp. 12390-12392, 2011.
    [Bibtex]
    @article ISI:000297782200017,
    Author = Herchel, Radovan and Travnicek, Zdenek and Zboril, Radek,
    Title = Tuning of the Critical Temperature in Iron(II) Spin-Crossover Materials
       Based on Bridging Polycyanidometallates: Pentacyanidonitrosylferrate(II)
       and Hexacyanidoplatinate(IV),
    Journal = INORGANIC CHEMISTRY,
    Year = 2011,
    Volume = 50,
    Number = 24,
    Pages = 12390-12392,
    Month = DEC 19,
    Abstract = The reactions of iron(II) sulfate,
       4-amino-3,5-di-2-pyridyl-4H-1,2,4-triazole (abpt), and
       pentacyanidonitrosylferrate(II) or hexacyanidoplatinate(IV) resulted in
       the formation of one-dimensional iron(II) spin-crossover compounds
       [Fe(abpt)(2)(mu-Fe(CN)(5)(NO))](n) (1) and
       [Fe(abpt)(2)(mu-Pt(CN)(6))](n) (2) with the spin-transition critical
       temperature near or above room temperature accompanied by
       thermochromism. Furthermore, it has been proven that the critical
       temperature T(c) is influenced by the type of dianionic
       polycyanidometallate within the series of discussed systems, and it
       changes in the sequence of [Fe(CN)(5)(NO)](2-) < \Pt(CN)(6))](2-) <
       [Ni(CN)(4))](2-) approximate to [Pd(CN)(4))\(2-) approximate to
       [Pt(CN)(4))](2-).,
    DOI = 10.1021/ic201702j,
    ISSN = 0020-1669,
    Unique-ID = ISI:000297782200017,
    
  • [DOI] A. B. Bourlinos, R. Zboril, M. Kubala, P. Stathi, Y. Deligiannakis, M. A. Karakassides, T. A. Steriotis, and A. K. Stubos, "Fabrication of fluorescent nanodiamond@C core-shell hybrids via mild
    carbonization of sodium cholate-nanodiamond complexes," JOURNAL OF MATERIALS SCIENCE, vol. 46, iss. 24, pp. 7912-7916, 2011.
    [Bibtex]
    @article ISI:000295177200032,
    Author = Bourlinos, A. B. and Zboril, R. and Kubala, M. and Stathi, P. and
       Deligiannakis, Y. and Karakassides, M. A. and Steriotis, T. A. and
       Stubos, A. K.,
    Title = Fabrication of fluorescent nanodiamond@C core-shell hybrids via mild
       carbonization of sodium cholate-nanodiamond complexes,
    Journal = JOURNAL OF MATERIALS SCIENCE,
    Year = 2011,
    Volume = 46,
    Number = 24,
    Pages = 7912-7916,
    Month = DEC,
    DOI = 10.1007/s10853-011-5911-z,
    ISSN = 0022-2461,
    Unique-ID = ISI:000295177200032,
    
  • [DOI] J. Cuda, T. Kohout, J. Tucek, J. Haloda, J. Filip, R. Prucek, and R. Zboril, "Low-temperature magnetic transition in troilite: A simple marker for
    highly stoichiometric FeS systems," JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, vol. 116, 2011.
    [Bibtex]
    @article ISI:000297257000001,
    Author = Cuda, J. and Kohout, T. and Tucek, J. and Haloda, J. and Filip, J. and
       Prucek, R. and Zboril, R.,
    Title = Low-temperature magnetic transition in troilite: A simple marker for
       highly stoichiometric FeS systems,
    Journal = JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,
    Year = 2011,
    Volume = 116,
    Month = NOV 15,
    Abstract = Low-temperature magnetic evolution of troilite sample, extracted from
       the Cape York IIIA octahedrite meteorite, was investigated by employing
       macroscopic magnetic measurement, Mssbauer spectroscopy, scanning
       electron microscopy (SEM) and backscattered electrons (BSE) microscopy,
       X-ray diffraction (XRD), electron microprobe analysis (EMA), and atomic
       absorption spectrometry (AAS). The study identified a magnetic
       transition at approximate to 70 K manifested itself in a similar manner
       as previously reported for troilite from the Bruderheim L6 chondrite
       meteorite. The data show that this transition is unlikely driven by
       impurity such as chromite and seems to be rather an intrinsic property
       of troilite. In this study, we unambiguously exclude the relation of
       this transition to the structural rearrangement like the Morin
       transition in hematite. Similarly, in-field Mssbauer data do not support
       the change of the canting angle in the spin structure of FeS above and
       below the transition. Mssbauer, XRD, and magnetic data, newly measured
       also for troilite from the Bruderheim L6 chondrite, demonstrate that
       both studied troilite samples exhibit nearly the same magnetic and
       structural characteristics. Thus, the nature of the transition occurring
       at approximate to 70 K in both samples has identical characteristics and
       its detection can be used as a simple general marker for highly
       stoichiometric FeS systems.,
    DOI = 10.1029/2011JB008232,
    Article-Number = B11205,
    ISSN = 0148-0227,
    Unique-ID = ISI:000297257000001,
    
  • [DOI] O. Schneeweiss, J. Filip, B. David, R. Zboril, and M. Maslan, "Iron nanoparticles prepared from natural ferrihydrite precursors:
    kinetics and properties," JOURNAL OF NANOPARTICLE RESEARCH, vol. 13, iss. 11, SI, pp. 5677-5684, 2011.
    [Bibtex]
    @article ISI:000297351600012,
    Author = Schneeweiss, O. and Filip, J. and David, B. and Zboril, R. and Maslan,
       M.,
    Title = Iron nanoparticles prepared from natural ferrihydrite precursors:
       kinetics and properties,
    Journal = JOURNAL OF NANOPARTICLE RESEARCH,
    Year = 2011,
    Volume = 13,
    Number = 11, SI,
    Pages = 5677-5684,
    Month = NOV,
    Note = 10th International Conference on Nanostructured Materials (NANO), Rome,
       ITALY, SEP 13-17, 2010,
    Organization = Int Comm Nanostruct Mat,
    Abstract = Natural ferrihydrite was used as the precursors for the preparation of
       the nanocrystalline alpha-Fe powder using heat treatment in hydrogen
       atmosphere. Transformation temperatures were estimated from the
       temperature dependences of magnetic moment. Structure and phase
       composition of the precursors and the final powders were characterized
       by X-ray diffraction and Mossbauer spectroscopy. Magnetic properties
       were characterized according to hysteresis loop parameters. The kinetics
       of the transformation was described using Avrami relation applied on the
       data of the isothermal time dependence of magnetic moment measurements
       and subsequently the activation enthalpy of transformation was estimated
       using Arrhenius plots of their parameters. Comparison of the changes of
       activation enthalpies derived from a different temperature ranges
       indicates effects of different processes on formation of alpha-Fe
       nanoparticles.,
    DOI = 10.1007/s11051-011-0383-2,
    ISSN = 1388-0764,
    Unique-ID = ISI:000297351600012,
    
  • [DOI] D. A. Golovko, V. K. Sharma, O. V. Pavlova, E. A. Belyanovskaya, I. D. Golovko, V. I. Suprunovich, and R. Zboril, "Determination of submillimolar concentration of ferrate(VI) in alkaline
    solutions by amperometric titration," CENTRAL EUROPEAN JOURNAL OF CHEMISTRY, vol. 9, iss. 5, pp. 808-812, 2011.
    [Bibtex]
    @article ISI:000293020400006,
    Author = Golovko, Dmitriy A. and Sharma, Virender K. and Pavlova, Olga. V. and
       Belyanovskaya, Elena A. and Golovko, Igor D. and Suprunovich, Victoria
       I. and Zboril, Radek,
    Title = Determination of submillimolar concentration of ferrate(VI) in alkaline
       solutions by amperometric titration,
    Journal = CENTRAL EUROPEAN JOURNAL OF CHEMISTRY,
    Year = 2011,
    Volume = 9,
    Number = 5,
    Pages = 808-812,
    Month = OCT,
    Abstract = A new amperometric titration method was developed for quantitative
       determination of ferrate(VI) (Fe(VI)O(4) (2-)) in the
       7.06x10(-5)-5.73x10(-3) M concentration range. Chromium(III) hydroxide
       solution was used as the titrant. The diffusion current (Id) had a
       linear relationship with the concentration of ferrate(VI) and slopes
       were dependent on the concentration of NaOH. The amperometric titration
       could detect a lower concentration of ferrate(VI) than could
       potentiometric and colorimetric titrations. The method was applied
       successfully to determine concentrations of ferrate(VI), generated
       electrochemically, in strong alkaline solutions.,
    DOI = 10.2478/s11532-011-0069-8,
    ISSN = 1895-1066,
    Unique-ID = ISI:000293020400006,
    
  • [DOI] R. Herchel, J. Tucek, Z. Travnicek, D. Petridis, and R. Zboril, "Crystal Water Molecules as Magnetic Tuners in Molecular Metamagnets
    Exhibiting Antiferro-Ferro-Paramagnetic Transitions," INORGANIC CHEMISTRY, vol. 50, iss. 18, pp. 9153-9163, 2011.
    [Bibtex]
    @article ISI:000294699700054,
    Author = Herchel, Radovan and Tucek, Jiri and Travnicek, Zdenek and Petridis,
       Dimitris and Zboril, Radek,
    Title = Crystal Water Molecules as Magnetic Tuners in Molecular Metamagnets
       Exhibiting Antiferro-Ferro-Paramagnetic Transitions,
    Journal = INORGANIC CHEMISTRY,
    Year = 2011,
    Volume = 50,
    Number = 18,
    Pages = 9153-9163,
    Month = SEP 19,
    Abstract = We studied the effects of the number of crystal water molecules on the
       magnetic behavior of \[Ni(en)(2)](3)[Fe(CN)(6)](2)center dot
       xH(2)O\(n) (1-3) (where en = ethylenediamine and x = 3, 2, or 0)
       coordination polymers by (57)Fe Mossbauer spectroscopy, single-crystal
       X-ray diffraction, and magnetization measurements. Magnetic phase
       diagrams constructed for all three compounds indicate that they behave
       as metamagnets exhibiting very rare field-induced
       antiferro-ferro-paramagnetic transitions. The number of crystal water
       molecules has a major effect on the Neel temperature, critical field,
       and magnetic hardness of the compounds in the ferromagnetic state.
       Moreover, the systems behave as molecular magnetic sponges, changing
       their magnetic properties due to the controllable and reversible
       dehydration/hydration process.,
    DOI = 10.1021/ic201358c,
    ISSN = 0020-1669,
    Unique-ID = ISI:000294699700054,
    
  • [DOI] P. Dallas, V. K. Sharma, and R. Zboril, "Silver polymeric nanocomposites as advanced antimicrobial agents:
    Classification, synthetic paths, applications, and perspectives," ADVANCES IN COLLOID AND INTERFACE SCIENCE, vol. 166, iss. 1-2, pp. 119-135, 2011.
    [Bibtex]
    @article ISI:000293550200007,
    Author = Dallas, Panagiotis and Sharma, Virender K. and Zboril, Radek,
    Title = Silver polymeric nanocomposites as advanced antimicrobial agents:
       Classification, synthetic paths, applications, and perspectives,
    Journal = ADVANCES IN COLLOID AND INTERFACE SCIENCE,
    Year = 2011,
    Volume = 166,
    Number = 1-2,
    Pages = 119-135,
    Month = AUG 10,
    Abstract = Utilization of metallic nanoparticles in various biotechnological and
       medical applications represents one of the most extensively investigated
       areas of the current materials science. These advanced applications
       require the appropriate chemical functionalization of the nanoparticles
       with organic molecules or their incorporation in suitable polymer
       matrices. The intensified interest in polymer nanocomposites with silver
       nanoparticles is due to the high antimicrobial effect of nanosilver as
       well as the unique characteristics of polymers which include their
       excellent structural uniformity, multivalency, high degree of branching,
       miscellaneous morphologies and architectures, and highly variable
       chemical composition. In this review, we explore several aspects of
       antimicrobial polymer silver nanocomposites, giving special focus to the
       critical analysis of the reported synthetic routes including their
       advantages, drawbacks, possible improvements, and real applicability in
       antibacterial and antifungal therapy. A special attention is given to
       ``green'' synthetic routes exploiting the biopolymeric matrix and to
       the methods allowing preparing magnetically controllable antimicrobial
       polymers for targeting to an active place. The controversial mechanism
       of the action of silver against bacteria, fungi and yeasts as well as
       perspectives and new applications of silver polymeric nanocomposites is
       also briefly discussed. (C) 2011 Elsevier B.V. All rights reserved.,
    DOI = 10.1016/j.cis.2011.05.008,
    ISSN = 0001-8686,
    Unique-ID = ISI:000293550200007,
    
  • [DOI] J. Filip, R. A. Yngard, K. Siskova, Z. Marusak, V. Ettler, P. Sajdl, V. K. Sharma, and R. Zboril, "Mechanisms and Efficiency of the Simultaneous Removal of Metals and
    Cyanides by Using Ferrate(VI): Crucial Roles of Nanocrystalline
    Iron(III) Oxyhydroxides and Metal Carbonates," CHEMISTRY-A EUROPEAN JOURNAL, vol. 17, iss. 36, pp. 10097-10105, 2011.
    [Bibtex]
    @article ISI:000295357800031,
    Author = Filip, Jan and Yngard, Ria A. and Siskova, Karolina and Marusak, Zdenek
       and Ettler, Vojtech and Sajdl, Petr and Sharma, Virender K. and Zboril,
       Radek,
    Title = Mechanisms and Efficiency of the Simultaneous Removal of Metals and
       Cyanides by Using Ferrate(VI): Crucial Roles of Nanocrystalline
       Iron(III) Oxyhydroxides and Metal Carbonates,
    Journal = CHEMISTRY-A EUROPEAN JOURNAL,
    Year = 2011,
    Volume = 17,
    Number = 36,
    Pages = 10097-10105,
    Month = AUG,
    Abstract = The reaction of potassium ferrate(VI), K(2)FeO(4), with weak-acid
       dissociable cyanides-namely, K(2)[Zn(CN)(4)], K(2)[Cd(CN)(4)],
       K(2)[Ni(CN)(4)], and K(3)[Cu(CN)(4)]-results in the formation of
       iron(III) oxyhydroxide nanoparticles that differ in size, crystal
       structure, and surface area. During cyanide oxidation and the
       simultaneous reduction of iron(VI), zinc(II), copper(II), and
       cadmium(II), metallic ions are almost completely removed from solution
       due to their co-precipitation with the iron(III) oxyhydroxides including
       2-line ferrihydrite, 7-line ferrihydrite, and/or goethite. Based on the
       results of XRD, Mossbauer and IR spectroscopies, as well as TEM, X-ray
       photoelectron emission spectroscopy, and Brunauer-Emmett-Teller
       measurements, we suggest three scavenging mechanisms for the removal of
       metals including their incorporation into the ferrihydrite crystal
       structure, the formation of a separate phase, and their adsorption onto
       the precipitate surface. Zn and Cu are preferentially and almost
       completely incorporated into the crystal structure of the iron(III)
       oxyhydroxides; the formation of the Cd-bearing, X-ray amorphous phase,
       together with Cd carbonate is the principal mechanism of Cd removal.
       Interestingly, Ni remains predominantly in solution due to the key role
       of nickel(II) carbonate, which exhibits a solubility product constant
       several orders of magnitude higher than the carbonates of the other
       metals. Traces of Ni, identified in the iron(III) precipitate, are
       exclusively adsorbed onto the large surface area of nanoparticles. We
       discuss the relationship between the crystal structure of iron(III)
       oxyhydroxides and the mechanism of metal removal, as well as the linear
       relationship observed between the rate constant and the surface area of
       precipitates.,
    DOI = 10.1002/chem.201100711,
    ISSN = 0947-6539,
    Unique-ID = ISI:000295357800031,
    
  • [DOI] L. Machala, J. Tucek, and R. Zboril, "Polymorphous Transformations of Nanometric Iron(III) Oxide: A Review," CHEMISTRY OF MATERIALS, vol. 23, iss. 14, pp. 3255-3272, 2011.
    [Bibtex]
    @article ISI:000292850700001,
    Author = Machala, Libor and Tucek, Jiri and Zboril, Radek,
    Title = Polymorphous Transformations of Nanometric Iron(III) Oxide: A Review,
    Journal = CHEMISTRY OF MATERIALS,
    Year = 2011,
    Volume = 23,
    Number = 14,
    Pages = 3255-3272,
    Month = JUL 26,
    Abstract = There is great interest in iron oxides, especially in nanosized form,
       for both fundamental and practical reasons. Because of its polymorphism,
       iron(III) oxide (ferric oxide, Fe(2)O(3)) is one of the most interesting
       and potentially useful phases of the iron oxides. Each of the four
       different known crystalline Fe(2)O(3) polymorphs (alpha-, beta-, gamma-,
       and epsilon-Fe(2)O(3)) has unique biochemical, magnetic, catalytic, and
       other properties that make it suitable for specific technical and
       biomedical applications. High temperature treatment is a key step in
       most syntheses of iron(III) oxides but often triggers polymorphous
       transformations that result in the formation of undesired mixtures of
       Fe(2)O(3) polymorphs. It is therefore important to control the
       parameters that induce polymorphous transformations when seeking to
       prepare a given Fe(2)O(3) polymorph as a single phase; identifying and
       understanding these parameters is a major challenge in the study of the
       polymorphism of solid compounds. This review discusses the dependence of
       the mechanism and kinetics of the polymorphous transformations of
       Fe(2)O(3) on the intrinsic properties of the material (polymorph
       structure, particle size, particle morphology, surface coating, particle
       aggregation, incorporation of particles within a matrix) and external
       parameters of synthetic and/or natural conditions such as temperature,
       atmosphere, and pressure. The high-temperature and high-pressure induced
       transformations of Fe(2)O(3) are reviewed in detail. In addition, the
       question of whether different Fe(2)O(3) polymorphs are formed
       sequentially or simultaneously during thermal processes is discussed
       extensively, with reference to the experimental results that have been
       invoked to support these two different mechanisms. The use of selected
       analytical tools in studying the polymorphous transformations of
       Fe(2)O(3) is also discussed, with particular emphasis on in situ
       approaches. Finally, key objectives for future research in this area are
       highlighted: (i) the development of more sophisticated kinetic control
       of the gamma-Fe(2)O(3) -> epsilon-Fe(2)O(3) phase transformation; (ii)
       investigation of particle morphology changes during the polymorphous
       transformations of Fe(2)O(3); and (iii) the study of high-pressure
       induced phase transformations of Fe(2)O(3) polymorphs other than
       alpha-Fe(2)O(3).,
    DOI = 10.1021/cm200397g,
    ISSN = 0897-4756,
    Unique-ID = ISI:000292850700001,
    
  • [DOI] K. Siskova, K. Safarova, J. H. Seo, R. Zboril, and M. Mashlan, "Non-chemical approach toward 2D self-assemblies of Ag nanoparticles via
    cold plasma treatment of substrates," NANOTECHNOLOGY, vol. 22, iss. 27, 2011.
    [Bibtex]
    @article ISI:000291021200028,
    Author = Siskova, Karolina and Safarova, Klara and Seo, Jung Hwa and Zboril,
       Radek and Mashlan, Miroslav,
    Title = Non-chemical approach toward 2D self-assemblies of Ag nanoparticles via
       cold plasma treatment of substrates,
    Journal = NANOTECHNOLOGY,
    Year = 2011,
    Volume = 22,
    Number = 27,
    Month = JUL 8,
    Abstract = The nano-modification of selected substrates by means of atmospheric
       cold plasma treatment was exploited for the two-dimensional (2D)
       self-assembling of silver nanoparticles (Ag NPs). Such a useful
       combination of the cold plasma treatment of substrate surface and an
       immediate easy deposition of Ag NPs creating the 2D self-assemblies on
       the substrates is published for the first time, to the best of our
       knowledge. Except for the cold plasma treatment, mainly the following
       parameters influenced the resulting NP assemblies: the choice of solvent
       mixture, concentration of Ag NP dispersions, and the deposition
       technique. The 2D self-assemblies of Ag NPs, providing the same work
       function as a Ag electrode, were formed on the cold plasma-treated
       substrates when a drop-casting technique was employed. The possibility
       of an easy preparation of the Ag NP 2D self-assemblies on substrates
       without using any chemical agents and/or evaporating chamber could be
       exploited, e.g. in photovoltaic and light-emitting diode devices.,
    DOI = 10.1088/0957-4484/22/27/275601,
    Article-Number = 275601,
    ISSN = 0957-4484,
    Unique-ID = ISI:000291021200028,
    
  • [DOI] R. Prucek, J. Tucek, M. Kilianova, A. Panacek, L. Kvitek, J. Filip, M. Kolar, K. Tomankova, and R. Zboril, "The targeted antibacterial and antifungal properties of magnetic
    nanocomposite of iron oxide and silver nanoparticles," BIOMATERIALS, vol. 32, iss. 21, pp. 4704-4713, 2011.
    [Bibtex]
    @article ISI:000291571400003,
    Author = Prucek, Robert and Tucek, Jiri and Kilianova, Martina and Panacek, Ales
       and Kvitek, Libor and Filip, Jan and Kolar, Milan and Tomankova,
       Katerina and Zboril, Radek,
    Title = The targeted antibacterial and antifungal properties of magnetic
       nanocomposite of iron oxide and silver nanoparticles,
    Journal = BIOMATERIALS,
    Year = 2011,
    Volume = 32,
    Number = 21,
    Pages = 4704-4713,
    Month = JUL,
    Abstract = Two types of magnetic binary nanocomposites, Ag@Fe(3)O(4) and
       gamma-Fe(2)O(3)@Ag, were synthesized and characterized and their
       antibacterial activities were tested. As a magnetic component, Fe(3)O(4)
       (magnetite) nanoparticles with an average size of about 70 nm and
       monodisperse gamma-Fe(2)O(3) (maghemite) nanoparticles with an average
       size of 5 nm were used. Nanocomposites were prepared via in situ
       chemical reduction of silver ions by maltose in the presence of
       particular magnetic phase and molecules of polyacrylate serving as a
       spacer among iron oxide and silver nanoparticles. In the case of the
       Ag@Fe(3)O(4) nanocomposite, silver nanoparticles, caught at the surfaces
       of Fe(3)O(4) nanocrystals, were around 5 nm in a size. On the contrary,
       in the case of the gamma-Fe(2)O(3)@Ag nanocomposite, ultrafine
       gamma-Fe(2)O(3) nanoparticles surrounded silver nanoparticles ranging in
       a size between 20 and 40 nm. In addition, the molecules of polyacrylate
       in this nanocomposite type suppress considerably interparticle magnetic
       interactions as proved by magnetization measurements. Both synthesized
       nanocomposites exhibited very significant antibacterial and antifungal
       activities against ten tested bacterial strains (minimum inhibition
       concentrations (MIC) from 15.6 mg/L to 125 mg/L) and four candida
       species (MIC from 1.9 mg/L to 31.3 mg/L). Moreover, acute nanocomposite
       cytotoxicity against mice embryonal fibroblasts was observed at
       concentrations of higher than 430 mg/L (Ag@Fe(3)O(4)) and 292 mg/L
       (gamma-Fe(2)O(3)@Ag). With respect to the non-cytotoxic nature of the
       polyacrylate linker, both kinds of silver nanocomposites are well
       applicable for a targeted magnetic delivery of silver nanoparticles in
       medicinal and disinfection applications. (C) 2011 Elsevier Ltd. All
       rights reserved.,
    DOI = 10.1016/j.biomaterials.2011.03.039,
    ISSN = 0142-9612,
    Unique-ID = ISI:000291571400003,
    
  • [DOI] A. Panacek, R. Prucek, D. Safarova, M. Dittrich, J. Richtrova, K. Benickova, R. Zboril, and L. Kvitek, "Acute and Chronic Toxicity Effects of Silver Nanoparticles (NPs) on
    Drosophila melanogaster," ENVIRONMENTAL SCIENCE & TECHNOLOGY, vol. 45, iss. 11, pp. 4974-4979, 2011.
    [Bibtex]
    @article ISI:000291128700045,
    Author = Panacek, Ales and Prucek, Robert and Safarova, Dana and Dittrich, Milan
       and Richtrova, Jana and Benickova, Katerina and Zboril, Radek and
       Kvitek, Libor,
    Title = Acute and Chronic Toxicity Effects of Silver Nanoparticles (NPs) on
       Drosophila melanogaster,
    Journal = ENVIRONMENTAL SCIENCE \& TECHNOLOGY,
    Year = 2011,
    Volume = 45,
    Number = 11,
    Pages = 4974-4979,
    Month = JUN 1,
    Abstract = The use of nanoscaled materials is rapidly increasing, however, their
       possible ecotoxicological effects are still not precisely known. This
       work constitutes the first complex study focused on in vivo evaluation
       of the acute and chronic toxic effects and toxic limits of silver
       nanoparticles (NPs) on the eukaryotic organism Drosophila melanogaster.
       For the purpose of this study, silver NPs were prepared in the form of
       solid dispersion using microencapsulation method, where mannitol was
       used as an encapsulation agent. This newly prepared solid dispersion
       with a high concentration of silver NPs was exploited to prepare the
       standard Drosophila culture medium at a silver concentration range from
       10 mg . L(-1) to 100 mg . L(-1) of Ag in the case of the acute toxicity
       testing and at a concentration equal to S mg . L in the case of the
       chronic toxicity testing. The acute toxic effect of silver NPs on
       Drosophila melanogaster was observed for the silver concentration equal
       to 20 mg . L(-1). At this silver concentration, 50\% of the tested flies
       were unable to leave the pupae, and they did not finish their
       developmental cycle. Chronic toxicity of silver NPs was assessed by a
       long-term exposure of overall eight filial generations of Drosophila
       melanogaster to silver NPs. The long-term exposure to silver NPs
       influenced the fertility of Drosophila during the first three filial
       generations, nevertheless the fecundity of flies in subsequent
       generations consequently increased up to the level of the flies from the
       control sample due to the adaptability of flies to the silver NPs
       exposure.,
    DOI = 10.1021/es104216b,
    ISSN = 0013-936X,
    Unique-ID = ISI:000291128700045,
    
  • [DOI] V. Prochazka, H. Stepankova, V. Chlan, J. Tucek, J. Cuda, K. Kouril, J. Filip, and R. Zboril, "Electric field gradient in FeTiO(3) by nuclear magnetic resonance and ab
    initio calculations," JOURNAL OF PHYSICS-CONDENSED MATTER, vol. 23, iss. 20, 2011.
    [Bibtex]
    @article ISI:000290212300014,
    Author = Prochazka, V. and Stepankova, H. and Chlan, V. and Tucek, J. and Cuda,
       J. and Kouril, K. and Filip, J. and Zboril, R.,
    Title = Electric field gradient in FeTiO(3) by nuclear magnetic resonance and ab
       initio calculations,
    Journal = JOURNAL OF PHYSICS-CONDENSED MATTER,
    Year = 2011,
    Volume = 23,
    Number = 20,
    Month = MAY 25,
    Abstract = Temperature dependence of nuclear magnetic resonance (NMR) spectra of
       (47)Ti and (49)Ti in polycrystalline ilmenite FeTiO(3) was measured in
       the range from 5 to 300 K under an external magnetic field of 9.401 T.
       NMR spectra collected between 300 and 77 K exhibit a resolved quadrupole
       splitting. The electric field gradient (EFG) tensor was evaluated for Ti
       nuclei and the ratio of (47)Ti and (49)Ti nuclear quadrupole moments was
       refined during the fitting procedure. Below 77 K, the fine structure of
       quadrupole splitting disappears due to the enormous increase of
       anisotropy.
       As a counterpart, ab initio calculations were performed using full
       potential augmented plane waves + local orbitals. The calculated EFG
       tensors for Ti and Fe were compared to the experimental ones evaluated
       from NMR and the Mossbauer spectroscopy experiments.,
    DOI = 10.1088/0953-8984/23/20/205503,
    Article-Number = 205503,
    ISSN = 0953-8984,
    Unique-ID = ISI:000290212300014,
    
  • [DOI] S. Klimkova, M. Cernik, L. Lacinova, J. Filip, D. Jancik, and R. Zboril, "Zero-valent iron nanoparticles in treatment of acid mine water from in
    situ uranium leaching," CHEMOSPHERE, vol. 82, iss. 8, pp. 1178-1184, 2011.
    [Bibtex]
    @article ISI:000287432100016,
    Author = Klimkova, Stepanka and Cernik, Miroslav and Lacinova, Lenka and Filip,
       Jan and Jancik, Dalibor and Zboril, Radek,
    Title = Zero-valent iron nanoparticles in treatment of acid mine water from in
       situ uranium leaching,
    Journal = CHEMOSPHERE,
    Year = 2011,
    Volume = 82,
    Number = 8,
    Pages = 1178-1184,
    Month = FEB,
    Abstract = Acid mine water from in situ chemical leaching of uranium (Straz pod
       Ralskem, Czech Republic) was treated in laboratory scale experiments by
       zero-valent iron nanoparticles (nZVI). For the first time, nZVI were
       applied for the treatment of the real acid water system containing the
       miscellaneous mixture of pollutants, where the various removal
       mechanisms occur simultaneously. Toxicity of the treated saline acid
       water is caused by major contaminants represented by aluminum and
       sulphates in a high concentration, as well as by microcontaminants like
       As, Be, Cd, Cr, Cu, Ni, U, V. and Zn. Laboratory batch experiments
       proved a significant decrease in concentrations of all the monitored
       pollutants due to an increase in pH and a decrease in
       oxidation-reduction potential related to an application of nZVI. The
       assumed mechanisms of contaminants removal include precipitation of
       cations in a lower oxidation state, precipitation caused by a simple pH
       increase and co-precipitation with the formed iron oxyhydroxides. The
       possibility to control the reaction kinetics through the nature of the
       surface stabilizing shell (polymer vs. FeO nano-layer) is discussed as
       an important practical aspect. (C) 2010 Elsevier Ltd. All rights
       reserved.,
    DOI = 10.1016/j.chemosphere.2010.11.075,
    ISSN = 0045-6535,
    Unique-ID = ISI:000287432100016,
    
  • [DOI] A. B. Bourlinos, M. A. Karakassides, P. Stathi, Y. Deligiannakis, R. Zboril, P. Dallas, T. A. Steriotis, A. K. Stubos, and C. Trapalis, "Pyrolytic formation of a carbonaceous solid for heavy metal adsorption," JOURNAL OF MATERIALS SCIENCE, vol. 46, iss. 4, pp. 975-982, 2011.
    [Bibtex]
    @article ISI:000286112900014,
    Author = Bourlinos, A. B. and Karakassides, M. A. and Stathi, P. and
       Deligiannakis, Y. and Zboril, R. and Dallas, P. and Steriotis, T. A. and
       Stubos, A. K. and Trapalis, C.,
    Title = Pyrolytic formation of a carbonaceous solid for heavy metal adsorption,
    Journal = JOURNAL OF MATERIALS SCIENCE,
    Year = 2011,
    Volume = 46,
    Number = 4,
    Pages = 975-982,
    Month = FEB,
    Abstract = The solid-state pyrolysis of acetylenedicarboxylic acid, monopotassium
       salt at 300 degrees C in air results in bulk quantities of a
       micron-sized yet macroporous oxidized carbon, which inherently possesses
       high content of metal-binding sites, such as carboxylate groups, free
       radicals, and ether/hydroxyl units. Besides its high oxygen content, the
       solid is stable in water and does not leach or disorient, while it also
       exhibits an appreciable thermal stability, at temperature exceeding 200
       degrees C in air. Several techniques including TEM/SEM, TGA,
       Raman/FT-IR, XPS, EPR, and potentiometric titrations were employed for
       the characterization of the solid. Furthermore, liquid phase adsorption
       experiments revealed that the material is an efficient heavy metal
       adsorbent due to the presence of diverse surface-accessible binding
       sites, showing unusually high metal uptake capacities for Pb(2+) and
       Cu(2+) ions (ca. 4.5 mmol g(-1)).,
    DOI = 10.1007/s10853-010-4854-0,
    ISSN = 0022-2461,
    Unique-ID = ISI:000286112900014,
    
  • [DOI] R. Herchel, Z. Travnicek, and R. Zboril, "Spin crossover behavior of a one-dimensional polymeric-chain compound
    \[Fe(abpt)(2)(mu-Ni(CN)(4))]center dot xH(2)O\(n) (x=0.5 -> 0):
    Synthesis, spectral, thermal and magnetic properties," INORGANICA CHIMICA ACTA, vol. 365, iss. 1, pp. 458-461, 2011.
    [Bibtex]
    @article ISI:000285624200068,
    Author = Herchel, Radovan and Travnicek, Zdenek and Zboril, Radek,
    Title = Spin crossover behavior of a one-dimensional polymeric-chain compound
       \[Fe(abpt)(2)(mu-Ni(CN)(4))]center dot xH(2)O\(n) (x=0.5 -> 0):
       Synthesis, spectral, thermal and magnetic properties,
    Journal = INORGANICA CHIMICA ACTA,
    Year = 2011,
    Volume = 365,
    Number = 1,
    Pages = 458-461,
    Month = JAN 15,
    Abstract = A one-dimensional polymeric-chain iron(II)-nickel(II) cyanido-bridged
       complex of the composition \[Fe(abpt)(2)(mu-Ni(CN)(4))]center dot
       0.5H(2)O\(n) (1.0.5H(2)O), where abpt =
       4-amino-3,5-di-2-pyridyl-4H-1,2,4-triazole, was prepared and
       characterized by elemental and thermal analyses, FTIR and (57)Fe
       Mossbauer spectroscopies, and magnetic measurements. The incomplete spin
       crossover phenomenon was observed with approximately 12\% of the frozen
       high-spin fraction at low temperatures and with the spin transition
       critical temperature above room temperature. (C) 2010 Elsevier B.V. All
       rights reserved.,
    DOI = 10.1016/j.ica.2010.08.030,
    ISSN = 0020-1693,
    Unique-ID = ISI:000285624200068,
    
  • [DOI] D. A. Golovko, V. K. Sharma, V. I. Suprunovich, O. V. Pavlova, I. D. Golovko, K. Bouzek, and R. Zboril, "A SIMPLE POTENTIOMETRIC TITRATION METHOD TO DETERMINE CONCENTRATION OF
    FERRATE(VI) IN STRONG ALKALINE SOLUTIONS," ANALYTICAL LETTERS, vol. 44, iss. 7, pp. 1333-1340, 2011.
    [Bibtex]
    @article ISI:000291643600015,
    Author = Golovko, Dmitriy A. and Sharma, Virender K. and Suprunovich, V. I. and
       Pavlova, O. V. and Golovko, I. D. and Bouzek, Karel and Zboril, Radek,
    Title = A SIMPLE POTENTIOMETRIC TITRATION METHOD TO DETERMINE CONCENTRATION OF
       FERRATE(VI) IN STRONG ALKALINE SOLUTIONS,
    Journal = ANALYTICAL LETTERS,
    Year = 2011,
    Volume = 44,
    Number = 7,
    Pages = 1333-1340,
    Abstract = A new potentiometric titration method using a Pt wire as an indicator
       electrode was developed for quantitative determination of ferrate(VI)
       (Fe(VI)O(4)(2-)) in the submillimolar to millimolar concentration range
       in a strong alkaline solution. A Ag/AgCl electrode was the reference
       electrode and the titrant used was chromium(III) hydroxide solution. The
       developed method is relatively simple and faster than the colorimetric
       titration technique. The method eliminates human error associated with
       the endpoint detection and increases accuracy of the results with
       respect to the colorimetric titration. The method was applied to study
       the decay of synthesized ferrate(VI) in alkaline solution.,
    DOI = 10.1080/00032719.2010.511748,
    ISSN = 0003-2719,
    Unique-ID = ISI:000291643600015,
    
  • [DOI] R. Prucek, A. Panacek, A. Fargasova, V. Ranc, V. Masek, L. Kvitek, and R. Zboril, "Re-crystallization of silver nanoparticles in a highly concentrated NaCl
    environment-a new substrate for surface enhanced IR-visible Raman
    spectroscopy," CRYSTENGCOMM, vol. 13, iss. 7, pp. 2242-2248, 2011.
    [Bibtex]
    @article ISI:000288562200014,
    Author = Prucek, Robert and Panacek, Ales and Fargasova, Ariana and Ranc, Vaclav
       and Masek, Vlastimil and Kvitek, Libor and Zboril, Radek,
    Title = Re-crystallization of silver nanoparticles in a highly concentrated NaCl
       environment-a new substrate for surface enhanced IR-visible Raman
       spectroscopy,
    Journal = CRYSTENGCOMM,
    Year = 2011,
    Volume = 13,
    Number = 7,
    Pages = 2242-2248,
    Abstract = The common approach of silver nanoparticles activation for surface
       enhanced Raman spectroscopy often exploits an addition of chloride ions,
       generally at low concentrations of about 0.1-10 mM in the final
       dispersion. For the first time, we report the applicability of a highly
       concentrated NaCl solution (final concentration of 400 mM) for the SERS
       activation of silver nanoparticles (similar to 30 nm). Microscopic,
       optical and particle size distribution measurements reveal the rapid and
       reproducible re-crystallization of the primary silver nanoparticles to
       one-order larger crystallites (similar to 400 nm) already after 15 min
       after NaCl addition. The crystal growth mechanism is discussed with
       respect to the proved essential role of oxygen in the reaction system.
       The specific action of chloride ions is demonstrated through a
       comparison with NaBr and NaI solutions of the identical concentrations,
       which do not induce the analogous crystallization process. The
       recrystallized silver particles are efficient in an enhancement of the
       Raman signal not only for visible (488 nm) but also for near infrared
       laser excitation (1064 nm) as illustrated with the representative
       spectra of adenine.,
    DOI = 10.1039/c0ce00776e,
    ISSN = 1466-8033,
    Unique-ID = ISI:000288562200014,
    
  • [DOI] K. Siskova, M. Kubala, P. Dallas, D. Jancik, A. Thorel, P. Ilik, and R. Zboril, "The effect of surface modification on the fluorescence and morphology of
    CdSe nanoparticles embedded in a 3D phosphazene-based matrix:
    nanowire-like quantum dots," JOURNAL OF MATERIALS CHEMISTRY, vol. 21, iss. 4, pp. 1086-1093, 2011.
    [Bibtex]
    @article ISI:000286110400023,
    Author = Siskova, Karolina and Kubala, Martin and Dallas, Panagiotis and Jancik,
       Dalibor and Thorel, Alain and Ilik, Petr and Zboril, Radek,
    Title = The effect of surface modification on the fluorescence and morphology of
       CdSe nanoparticles embedded in a 3D phosphazene-based matrix:
       nanowire-like quantum dots,
    Journal = JOURNAL OF MATERIALS CHEMISTRY,
    Year = 2011,
    Volume = 21,
    Number = 4,
    Pages = 1086-1093,
    Abstract = We have synthesized and characterized a new type of emissive
       nanocomposite material consisting of a 3D inorganic-organic
       phosphazene-based polymer and CdSe quantum dots (QDs). The materials
       uniquely combine and inherit the polymers 3D character and the QD
       fluorescence properties. Furthermore, we have proven that benzidine
       molecules are suitable surface-modifiers of QDs resulting in
       fluorescent, nearly spherical QDs arranged into the unique nanowire-like
       structure. Moreover, the benzidine-to-CdSe energy transfer has been
       observed which can be further exploited. Characterization of the
       as-synthesized materials has been performed by using UV-visible and
       FT-IR absorption spectroscopy, energy dispersive X-ray analysis (EDX),
       transmission electron microscopy (TEM), high resolution-transmission
       electron microscopy (HR-TEM), scanning electron microscopy (SEM),
       steady-state and time-resolved fluorescence measurements.,
    DOI = 10.1039/c0jm02360d,
    ISSN = 0959-9428,
    Unique-ID = ISI:000286110400023,
    

2010

  • [DOI] J. Tucek, R. Zboril, A. Namai, and S. Ohkoshi, "epsilon-Fe(2)O(3): An Advanced Nanomaterial Exhibiting Giant Coercive
    Field, Millimeter-Wave Ferromagnetic Resonance, and Magnetoelectric
    Coupling," CHEMISTRY OF MATERIALS, vol. 22, iss. 24, pp. 6483-6505, 2010.
    [Bibtex]
    @article ISI:000285429000001,
    Author = Tucek, Jiri and Zboril, Radek and Namai, Asuka and Ohkoshi, Shin-ichi,
    Title = epsilon-Fe(2)O(3): An Advanced Nanomaterial Exhibiting Giant Coercive
       Field, Millimeter-Wave Ferromagnetic Resonance, and Magnetoelectric
       Coupling,
    Journal = CHEMISTRY OF MATERIALS,
    Year = 2010,
    Volume = 22,
    Number = 24,
    Pages = 6483-6505,
    Month = DEC 28,
    Abstract = Nanosized iron oxides still attract significant attention within the
       scientific community, because of their application-promising properties.
       Among them, epsilon-Fe(2)O(3) constitutes a remarkable phase, taking
       pride in a giant coercive field at room temperature, significant
       ferromagnetic resonance, and coupled magnetoelectric features that are
       not observed in any other simple metal oxide phase. In this work, we
       review basic structural and magnetic characteristics of this
       extraordinary nanomaterial with an emphasis on questionable and
       unresolved issues raised during its intense research in the past years.
       We show how a combination of various experimental techniques brings
       essential and valuable information, with regard to understanding the
       physicochemical properties of the E-polymorph of Fe(2)O(3), which
       remained unexplored for a long period of time. In addition, we
       recapitulate a series of synthetic routes that lead to the formation of
       epsilon-Fe(2)O(3), highlighting their advantages and drawbacks. We also
       demonstrate how magnetic properties of epsilon-Fe(2)O(3) can be tuned
       through the exploitation of various morphologies of epsilon-Fe(2)O(3)
       nanosystems, the alignment of epsilon-Fe(2)O(3) nanoobjects in a
       supporting matrix, and various degrees of cation substitution. Based on
       the current knowledge of the scientific community working in the field
       of epsilon-Fe(2)O(3), we finally arrive at two main future challenges:
       (i) the search for optimal synthetic conditions to prepare single-phase
       epsilon-Fe(2)O(3) with a high yield, desired size, morphology, and
       stability; and (ii) the search for a correct description of the magnetic
       behavior of epsilon-Fe(2)O(3) at temperatures below the characteristic
       magnetic ordering temperature.,
    DOI = 10.1021/cm101967h,
    ISSN = 0897-4756,
    Unique-ID = ISI:000285429000001,
    
  • [DOI] R. Zboril, F. Karlicky, A. B. Bourlinos, T. A. Steriotis, A. K. Stubos, V. Georgakilas, K. Safarova, D. Jancik, C. Trapalis, and M. Otyepka, "Graphene Fluoride: A Stable Stoichiometric Graphene Derivative and its
    Chemical Conversion to Graphene," SMALL, vol. 6, iss. 24, pp. 2885-2891, 2010.
    [Bibtex]
    @article ISI:000285793900015,
    Author = Zboril, Radek and Karlicky, Frantisek and Bourlinos, Athanasios B. and
       Steriotis, Theodore A. and Stubos, Athanasios K. and Georgakilas,
       Vasilios and Safarova, Klara and Jancik, Dalibor and Trapalis, Christos
       and Otyepka, Michal,
    Title = Graphene Fluoride: A Stable Stoichiometric Graphene Derivative and its
       Chemical Conversion to Graphene,
    Journal = SMALL,
    Year = 2010,
    Volume = 6,
    Number = 24,
    Pages = 2885-2891,
    Month = DEC 20,
    Abstract = Stoichoimetric graphene fluoride monolayers are obtained in a single
       step by the liquid-phase exfoliation of graphite fluoride with
       sulfolane. Comparative quantum-mechanical calculations reveal that
       graphene fluoride is the most thermodynamically stable of five studied
       hypothetical graphene derivatives; graphane, graphene fluoride, bromide,
       chloride, and iodide. The graphene fluoride is transformed into graphene
       via graphene iodide, a spontaneously decomposing intermediate. The
       calculated bandgaps of graphene halides vary from zero for graphene
       bromide to 3.1 eV for graphene fluoride. It is possible to design the
       electronic properties of such two-dimensional crystals.,
    DOI = 10.1002/smll.201001401,
    ISSN = 1613-6810,
    Unique-ID = ISI:000285793900015,
    
  • O. Schneeweiss, B. David, T. Zak, J. Filip, J. Tucek, R. Zboril, and M. Maslan, "Magnetic Interactions between Nanoparticles Formed during Calcination of
    Ferrihydrite," ACTA PHYSICA POLONICA A, vol. 118, iss. 5, pp. 749-750, 2010.
    [Bibtex]
    @article ISI:000285797100015,
    Author = Schneeweiss, O. and David, B. and Zak, T. and Filip, J. and Tucek, J.
       and Zboril, R. and Maslan, M.,
    Title = Magnetic Interactions between Nanoparticles Formed during Calcination of
       Ferrihydrite,
    Journal = ACTA PHYSICA POLONICA A,
    Year = 2010,
    Volume = 118,
    Number = 5,
    Pages = 749-750,
    Month = NOV,
    Note = 14th Czech and Slovak Conference on Magnetism, Kosice, SLOVAKIA, JUN
       06-09, 2010,
    Organization = Safarik Univ, Fac Sci; Inst Phys, Slovak Acad Sci; Slovak Phys Soc,
    Abstract = Magnetic interactions between nanoparticles of magnetite Fe(3)O(4) and
       alpha-Fe Formed during calcination of ferrihydrite in H(2) at
       temperatures 533 - 713 K were studied The detailed phase analysis
       describes evolution of contents of magnetite and alpha-Fe Explanation of
       an anomalous course of magnetic moment characterized by a local maximum
       at an early stage of formation of nanoparticles is discussed,
    ISSN = 0587-4246,
    Unique-ID = ISI:000285797100015,
    
  • [DOI] J. Soukupova, L. Kvitek, M. Kratochvilova, A. Panacek, R. Prucek, and R. Zboril, "Silver Voyage from Macro- to Nanoworld," JOURNAL OF CHEMICAL EDUCATION, vol. 87, iss. 10, pp. 1094-1097, 2010.
    [Bibtex]
    @article ISI:000281834400024,
    Author = Soukupova, Jana and Kvitek, Libor and Kratochvilova, Martina and
       Panacek, Ales and Prucek, Robert and Zboril, Radek,
    Title = Silver Voyage from Macro- to Nanoworld,
    Journal = JOURNAL OF CHEMICAL EDUCATION,
    Year = 2010,
    Volume = 87,
    Number = 10,
    Pages = 1094-1097,
    Month = OCT,
    DOI = 10.1021/ed1003405,
    ISSN = 0021-9584,
    Unique-ID = ISI:000281834400024,
    
  • [DOI] J. Pinkas, V. Reichlova, A. Serafimidisova, Z. Moravec, R. Zboril, D. Jancik, and P. Bezdicka, "Sonochemical Synthesis of Amorphous Yttrium Iron Oxides Embedded in
    Acetate Matrix and their Controlled Thermal Crystallization toward
    Garnet (Y(3)Fe(5)O(12)) and Perovskite (YFeO(3)) Nanostructures," JOURNAL OF PHYSICAL CHEMISTRY C, vol. 114, iss. 32, pp. 13557-13564, 2010.
    [Bibtex]
    @article ISI:000280727500022,
    Author = Pinkas, Jiri and Reichlova, Vendula and Serafimidisova, Aneta and
       Moravec, Zdenek and Zboril, Radek and Jancik, Dalibor and Bezdicka, Petr,
    Title = Sonochemical Synthesis of Amorphous Yttrium Iron Oxides Embedded in
       Acetate Matrix and their Controlled Thermal Crystallization toward
       Garnet (Y(3)Fe(5)O(12)) and Perovskite (YFeO(3)) Nanostructures,
    Journal = JOURNAL OF PHYSICAL CHEMISTRY C,
    Year = 2010,
    Volume = 114,
    Number = 32,
    Pages = 13557-13564,
    Month = AUG 19,
    Abstract = Sonolysis of stoichiometric mixtures of tris(2,4-pentanedionato)iron,
       Fe(acac)(3), and tris(2,4-pentanedionato)yttrium, Y(acac)(3)(H(2)O)(3),
       under Ar atmosphere in tetraglyme led to a colloidal solution from which
       amorphous Y-Fe-O nanopowders could be precipitated by hexane. These
       powders are composed of amorphous nanoparticles (3 nm) of yttrium
       iron(III) oxide embedded in an acetate matrix as proved by X-ray
       diffraction (XRD), transmission electron microscopy (TEM), scanning
       electron microscopy (SEM), mass spectrometry, and Mossbauer and IR
       spectroscopy. The increasing amount (0, 2, 6\%) of added water in the
       reaction mixture was found to lower the organics content in the
       sonochemical products. The thermally induced crystallization of the
       amorphous Y-Fe-O nanoparticles was studied by thermal analysis (TG/DSC),
       evolved gas analysis (EGA), high-temperature XRD, and Mossbauer
       spectroscopy. Depending on the Y/Fe starting stoichiometric ratio in the
       sonicated reaction mixture, the single-phase YFeO(3) (YIP) with the
       perovskite structure or Y(3)Fe(5)O(12) (YIG) with the garnet structure
       can be synthesized by such controlled thermal transformation. The
       single-phase character of crystallized samples and the well-defined
       structure of both YIP and YIG nanoparticles were confirmed by XRD and
       Mossbauer spectra excluding the presence of any other phases in the
       reaction products. The hyperfine parameters of magnetically ordered
       spectrum of YIP reflect the octahedral environment of high-spin Fe(III)
       in the perovskite structure, while two nonequivalent octahedral and
       tetrahedral Fe(III) positions were identified in the YIG garnet
       spectrum.,
    DOI = 10.1021/jp104091n,
    ISSN = 1932-7447,
    Unique-ID = ISI:000280727500022,
    
  • [DOI] L. Smolakova, T. Grygar, L. Capek, O. Schneeweiss, and R. Zboril, "Speciation of Fe in Fe-modified zeolite catalysts," JOURNAL OF ELECTROANALYTICAL CHEMISTRY, vol. 647, iss. 1, pp. 8-19, 2010.
    [Bibtex]
    @article ISI:000280863200002,
    Author = Smolakova, Lucie and Grygar, Tomas and Capek, Libor and Schneeweiss,
       Oldrich and Zboril, Radek,
    Title = Speciation of Fe in Fe-modified zeolite catalysts,
    Journal = JOURNAL OF ELECTROANALYTICAL CHEMISTRY,
    Year = 2010,
    Volume = 647,
    Number = 1,
    Pages = 8-19,
    Month = AUG 15,
    Abstract = Fe-modified zeolites (ferrierite and MFI) were prepared by four
       impregnation methods followed by calcination and tested as catalysts in
       oxidative dehydrogenation of ethane by nitrous oxide at 350 degrees C.
       The Fe cationic and Fe oxidic species were identified by combination of
       UV-Vis spectroscopy and voltammetry. Monomeric or dimeric Fe ions have
       only UV absorption bands and some of them evolve voltammetrically
       identifiable [Fe(OH)(x)]((3-x)+) ions in contact with acetic
       acid-sodium acetate buffer. Fe oxide nanoclusters characterised by UV
       band at about 28,000 cm(-1) are not detected by voltammetry under chosen
       conditions because they are situated inside the zeolite channels.
       Amorphous, nanocrystalline, and crystalline Fe(III) oxides were
       distinguished sensitively by their specific voltammetric reduction peaks
       at potentials -0.1 to -0.8 V/SCE in acetate buffer (pH 4.7) and by
       phase-specific electron pair transitions responsible for Vis absorption
       band centred at 17,500-21,000 cm(-1). The proposed method to
       differentiation between these ferric oxides is novel in materials
       analysis and solid state speciation. The monomeric and dimeric ferric
       ions are active in oxidative dehydrogenation of ethane to ethene with
       selectivity about 40-60\% under used conditions, while Fe oxide
       nanoclusters are too active and over-oxidise ethane and/or ethene to C,
       CO and CO(2). Oppositely to general expectations, ferric oxides are
       indifferent in the catalytic reaction and do not decrease reaction
       selectivity. (C) 2010 Elsevier B.V. All rights reserved.,
    DOI = 10.1016/j.jelechem.2010.05.017,
    ISSN = 1572-6657,
    Unique-ID = ISI:000280863200002,
    
  • [DOI] T. Kohout, A. Kosterov, J. Haloda, P. Tycova, and R. Zboril, "Low-temperature magnetic properties of iron-bearing sulfides and their
    contribution to magnetism of cometary bodies," ICARUS, vol. 208, iss. 2, pp. 955-962, 2010.
    [Bibtex]
    @article ISI:000280183000037,
    Author = Kohout, Tomas and Kosterov, Andrei and Haloda, Jakub and Tycova,
       Patricie and Zboril, Radek,
    Title = Low-temperature magnetic properties of iron-bearing sulfides and their
       contribution to magnetism of cometary bodies,
    Journal = ICARUS,
    Year = 2010,
    Volume = 208,
    Number = 2,
    Pages = 955-962,
    Month = AUG,
    Abstract = In this study we present a review of low-temperature magnetic properties
       of alabandite (Fe, Mn)S, daubreelite FeCr(2)S(4), pyrrhotite Fe(1-x),S
       and troilite FeS updated with new experimental data. The results
       indicate that besides FeNi alloys mainly daubreelite with its Curie
       temperature T(C)similar to 150 K and strong induced and remanent
       magnetizations may be a significant magnetic mineral in cold
       environments and may complement that of FeNi or even dominate magnetic
       properties of sulfide rich bodies at temperatures below T(C).
       Comets are known to contain iron-bearing sulfides within dusty fraction
       and their surfaces are subject to temperature variations in the range of
       100-200 K down to the depth of several meters while the cometary
       interior is thermally stable at several tens of Kelvin which is within
       the temperature range where alabandite, daubreelite or troilite are
       ``magnetic''. Thus not only FeNi alloys, but also sulfides have to be
       considered in the interpretation of magnetic data from cometary objects
       such as will be delivered by Rosetta mission. Modeling indicates that
       magnetic interactions between cometary nucleus containing iron-bearing
       sulfides and interplanetary magnetic field would be difficult, but not
       impossible, to detect from orbit. Rosetta's Philae lander present on the
       surface would provide more reliable signal.. (C) 2010 Elsevier Inc. All
       rights reserved.,
    DOI = 10.1016/j.icarus.2010.03.021,
    ISSN = 0019-1035,
    Unique-ID = ISI:000280183000037,
    
  • [DOI] P. Dallas, J. Tucek, D. Jancik, M. Kolar, A. Panacek, and R. Zboril, "Magnetically Controllable Silver Nanocomposite with Multifunctional
    Phosphotriazine Matrix and High Antimicrobial Activity," ADVANCED FUNCTIONAL MATERIALS, vol. 20, iss. 14, pp. 2347-2354, 2010.
    [Bibtex]
    @article ISI:000280427000019,
    Author = Dallas, Panagiotis and Tucek, Jiri and Jancik, Dalibor and Kolar, Milan
       and Panacek, Ales and Zboril, Radek,
    Title = Magnetically Controllable Silver Nanocomposite with Multifunctional
       Phosphotriazine Matrix and High Antimicrobial Activity,
    Journal = ADVANCED FUNCTIONAL MATERIALS,
    Year = 2010,
    Volume = 20,
    Number = 14,
    Pages = 2347-2354,
    Month = JUL 23,
    Abstract = A recently developed multi-functional phosphotriazine-based polymer is
       used as a matrix for embedding gamma-Fe(2)O(3) nanoparticles as well as
       a suitable chemical template for surface modification with silver
       nanoparticles. For the; primary magnetic modification, maghemite
       nanoparticles are surface modified with oleic acid in order to render
       them organophilic and to prevent the aggregation of the nanoparticles.
       This aggregation could occur as the polymer synthesis, based on reaction
       of phosphonitrilic chlorine and 1,4phenylenediamine, takes place in
       toluene. The surface active amine units of the polymer structure enable
       the reduction of silver cations to silver nanoparticles, which are well
       attached and finely dispersed on its surface. The developed
       nanocomposite represents one of the few magnetically controllable
       antibacterial agents based on silver nanoparticles. Magnetic
       measurements reveal the completely suppressed interactions among
       maghemite nanoparticles because of their perfect surface coating with an
       organic surfactant and fine dispersion inside the polymer matrix. This
       magnetic nanocomposite exhibits a high antibacterial and antifungal
       activity as proven by tests with nine bacterial strains and four candida
       (yeast genus) species. For the majority of the tested species, the
       minimum-inhibition concentrations are below 100 mg L(-1), which is
       comparable to their equivalent minimum-inhibition concentrations in
       colloidal silver systems.,
    DOI = 10.1002/adfm.200902370,
    ISSN = 1616-301X,
    Unique-ID = ISI:000280427000019,
    
  • [DOI] K. Sivula, R. Zboril, F. Le Formal, R. Robert, A. Weidenkaff, J. Tucek, J. Frydrych, and M. Graetzel, "Photoelectrochemical Water Splitting with Mesoporous Hematite Prepared
    by a Solution-Based Colloidal Approach," JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 132, iss. 21, pp. 7436-7444, 2010.
    [Bibtex]
    @article ISI:000278190600045,
    Author = Sivula, Kevin and Zboril, Radek and Le Formal, Florian and Robert, Rosa
       and Weidenkaff, Anke and Tucek, Jiri and Frydrych, Jiri and Graetzel,
       Michael,
    Title = Photoelectrochemical Water Splitting with Mesoporous Hematite Prepared
       by a Solution-Based Colloidal Approach,
    Journal = JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,
    Year = 2010,
    Volume = 132,
    Number = 21,
    Pages = 7436-7444,
    Month = JUN 2,
    Abstract = Sustainable hydrogen production through photoelectrochemical water
       splitting using hematite (alpha-Fe(2)O(3)) is a promising approach for
       the chemical storage of solar energy, but is complicated by the
       material's nonoptimal optoelectronic properties. Nanostructuring
       approaches have been shown to increase the performance of hematite, but
       the ideal nanostructure giving high efficiencies for all absorbed light
       wavelengths remains elusive. Here, we report for the first time
       mesoporous hematite photoelectodes prepared by a solution-based
       colloidal method which yield water-splitting photocurrents of 0.56 mA
       cm(-2) under standard conditions (AM 1.5G 100 mW cm(-2), 1.23 V vs
       reversible hydrogen electrode, RHE) and over 1.0 mA cm(-2) before the
       dark current onset (1.55 V vs RHE). The sintering temperature is found
       to increase the average particle size, and have a drastic effect on the
       photoactivity. X-ray photoelectron spectroscopy and magnetic
       measurements using a SQUID magnetometer link this effect to the
       diffusion and incorporation of dopant atoms from the transparent
       conducting substrate. In addition, examining the optical properties of
       the films reveals a considerable change in the absorption coefficient
       and onset properties, critical aspects for hematite as a solar energy
       converter, as a function of the sintering temperature. A detailed
       investigation into hematite's crystal structure using powder X-ray
       diffraction with Rietveld refinement to account for these effects
       correlates an increase in a C(3v)-type crystal lattice distortion to the
       improved optical properties.,
    DOI = 10.1021/ja101564f,
    ISSN = 0002-7863,
    Unique-ID = ISI:000278190600045,
    
  • [DOI] C. Gregor, M. Hermanek, D. Jancik, J. Pechousek, J. Filip, J. Hrbac, and R. Zboril, "The Effect of Surface Area and Crystal Structure on the Catalytic
    Efficiency of Iron(III) Oxide Nanoparticles in Hydrogen Peroxide
    Decomposition," EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, iss. 16, pp. 2343-2351, 2010.
    [Bibtex]
    @article ISI:000278888300003,
    Author = Gregor, Cenek and Hermanek, Martin and Jancik, Dalibor and Pechousek,
       Jiri and Filip, Jan and Hrbac, Jan and Zboril, Radek,
    Title = The Effect of Surface Area and Crystal Structure on the Catalytic
       Efficiency of Iron(III) Oxide Nanoparticles in Hydrogen Peroxide
       Decomposition,
    Journal = EUROPEAN JOURNAL OF INORGANIC CHEMISTRY,
    Year = 2010,
    Number = 16,
    Pages = 2343-2351,
    Month = JUN,
    Abstract = Iron(II) oxalate dihydrate has been used as a readily decomposable
       substance for the controlled synthesis of nanosized iron(III) oxides.
       The polymorphous composition, particle size and surface area of these
       iron oxide nanoparticles were controlled by varying the reaction
       temperature between 185 and 500 degrees C. As-prepared samples were
       characterized by XRD, low-temperature and in-field Mossbauer
       spectroscopy, BET surface area and the TEM technique. They were also
       tested as heterogeneous catalysts in hydrogen peroxide decomposition. At
       the selected temperatures, the formed nanomaterials did not contain any
       traces of amorphous phase, which is known to considerably reduce the
       catalytic efficiency of iron(III) oxide catalysts. As the thickness of
       the sample (approximate to 2 mm) was above the critical value, a
       temporary temperature increase (''exo effect'') was observed during
       all quasi-isothermal decompositions studied, irrespective of the
       reaction temperature. Increasing the reaction temperature resulted in a
       shift of the exo effect towards shorter times and an increased content
       of maghemite phase. The maghemite content decreases above 350 degrees C
       as a result of a thermally induced polymorphous transition into
       hematite. The catalytic data demonstrate that the crystal structure of
       iron(III) oxide (i.e. the relative contents of maghemite and hematite)
       does not influence the rate of hydrogen peroxide decomposition. However,
       the rate constant increases monotonously with increasing sample surface
       area (and decreasing thermolysis temperature), reaching a maximum of 27
       x 10(-3) min(-1)(g/L)(-1) for the sample with a surface area of 285
       m(2)g(-1). This rate constant is currently the highest reported value of
       all known iron oxide catalytic systems and is even slightly higher than
       that observed for the most efficient catalyst reported to date, which
       has a significantly larger surface area of 337 m(2)g(-1). This
       surprisingly high catalytic activity at relatively low surface area can
       be ascribed to the absence of a amorphous phase in the samples prepared
       in this study. Taking into account these new findings, the contributions
       of the key factors highlighted above (surface area, particle size,
       crystal structure, crystallinity) to the overall activity of iron oxides
       for hydrogen peroxide decomposition are discussed.,
    DOI = 10.1002/ejic.200901066,
    ISSN = 1434-1948,
    Unique-ID = ISI:000278888300003,
    
  • [DOI] Z. Travnicek, R. Herchel, J. Mikulik, and R. Zboril, "Copper(II) cyanido-bridged bimetallic nitroprusside-based complexes:
    Syntheses, X-ray structures, magnetic properties, (57)Fe Mossbauer
    spectroscopy and thermal studies," JOURNAL OF SOLID STATE CHEMISTRY, vol. 183, iss. 5, pp. 1046-1054, 2010.
    [Bibtex]
    @article ISI:000277675500009,
    Author = Travnicek, Zdenek and Herchel, Radovan and Mikulik, Jiri and Zboril,
       Radek,
    Title = Copper(II) cyanido-bridged bimetallic nitroprusside-based complexes:
       Syntheses, X-ray structures, magnetic properties, (57)Fe Mossbauer
       spectroscopy and thermal studies,
    Journal = JOURNAL OF SOLID STATE CHEMISTRY,
    Year = 2010,
    Volume = 183,
    Number = 5,
    Pages = 1046-1054,
    Month = MAY,
    Abstract = Three heterobimetallic cyanido-bridged copper(II) nitroprusside-based
       complexes of the compositions [Cu(tet)Fe(CN)(5)O]center dot H(2)O (1),
       where tet=N,N'-bis(3-aminopropyl)ethylenediamine,
       [Cu(hto)Fe(CN)(5)NO]center dot 2H(2)O (2), where
       hto=1,3,6,9,11,14-hexaazatricyclo[12.2.1.1(69)]octadecane and
       [Cu(hto)(2)Fe(CN)(5)NO]center dot H(2)O (3), where
       nme=N-methylethylenediamine, were synthesized and characterized by
       elemental analyses, (57)Fe Mossbauer and FTI spectroscopies, thermal
       analysis, magnetic measurements and single-crystal X-ray analysis. The
       products of thermal degradation processes of 2 and 3 were studied by
       XRD, (57)Fe Mossbauer spectroscopy, SEM and EDS, and they were
       identified as mixtures of CuFe(2)O(4) and CuO. (C) 2010 Elsevier Inc.
       All rights reserved.,
    DOI = 10.1016/j.jssc.2010.03.001,
    ISSN = 0022-4596,
    Unique-ID = ISI:000277675500009,
    
  • [DOI] Z. Travnicek, I. Popa, M. Cajan, R. Zboril, V. Krystof, and J. Mikulik, "The first iron(III) complexes with cyclin-dependent kinase inhibitors:
    Magnetic, spectroscopic (IR, ES+ MS, NMR, (57)Fe Mossbauer),
    theoretical, and biological activity studies," JOURNAL OF INORGANIC BIOCHEMISTRY, vol. 104, iss. 4, pp. 405-417, 2010.
    [Bibtex]
    @article ISI:000274921200007,
    Author = Travnicek, Zdenek and Popa, Igor and Cajan, Michal and Zboril, Radek and
       Krystof, Vladimir and Mikulik, Jiri,
    Title = The first iron(III) complexes with cyclin-dependent kinase inhibitors:
       Magnetic, spectroscopic (IR, ES+ MS, NMR, (57)Fe Mossbauer),
       theoretical, and biological activity studies,
    Journal = JOURNAL OF INORGANIC BIOCHEMISTRY,
    Year = 2010,
    Volume = 104,
    Number = 4,
    Pages = 405-417,
    Month = APR,
    Abstract = The first Fe(III) complexes 1-6 with cyclin-dependent kinase (CDK)
       inhibitors of the type [Fe(L(n))Cl(3)]center dot nH(2)O (n = 0 for 1,
       1 for 2, 2 for 3-6; L(1)-L(6) = C2- and phenyl-substituted CDK
       inhibitors derived from 6-benzyl-amino-9-isopropylpurine), have been
       synthesized and characterized by elemental analysis, IR, (57)Fe
       Mossbauer, (1)H and (13)C NMR, and ES+ mass spectroscopies, conductivity
       and magnetic susceptibility measurements, and thermogravimetric analysis
       (TGA) and differential scanning calorimetry (DSC). The study revealed
       that the compounds are mononuclear, tetrahedral high-spin (S = 5/2)
       Fe(III) complexes with an admixture of an S = 3/2 spin state originating
       probably from five-coordinated Fe(III) ions either connecting with a
       bidentate coordination mode of the CDK inhibitor ligand or relating to
       the possibility that one crystal water molecule enters the coordination
       sphere of the central atom in a portion of molecules of the appropriate
       complex. Nearly spin-only value of the effective magnetic moment (5.82
       mu(eff)/mu(B)) was determined for compound 1 due to absence of crystal
       water molecule(s) in the structure of the complex. Based on NMR data and
       DFT calculations, we assume that the appropriate organic ligand is
       coordinated to the Fe(III) ion through the N7 atom of a purine moiety.
       The cytotoxicity of the complexes was tested in vitro against selected
       human cancer cell lines (G-361, HOS, K-562 and MCF-7) along with the
       ability to inhibit the CDK2/cyclinE kinase. The best cytotoxicity
       (IC(50): 4-23 mu M) and inhibition activity (IC(50): 0.02-0.09 mu M)
       results have been achieved in the case of complexes 2-4, and complexes
       3,4 and 6, respectively. In addition, the X-ray structure of
       2-chloro-6-benzylamino-9-isopropylpurine, i.e. a precursor for the
       preparation of L(1), L(4) and L(5), is also described. (C) 2009 Elsevier
       Inc. All rights reserved.,
    DOI = 10.1016/j.jinorgbio.2009.12.002,
    ISSN = 0162-0134,
    Unique-ID = ISI:000274921200007,
    
  • [DOI] P. Hermankova, M. Hermanek, and R. Zboril, "Thermal Decomposition of Ferric Oxalate Tetrahydrate in Oxidative and
    Inert Atmospheres: The Role of Ferrous Oxalate as an Intermediate," EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, iss. 7, pp. 1110-1118, 2010.
    [Bibtex]
    @article ISI:000275695200014,
    Author = Hermankova, Pavla and Hermanek, Martin and Zboril, Radek,
    Title = Thermal Decomposition of Ferric Oxalate Tetrahydrate in Oxidative and
       Inert Atmospheres: The Role of Ferrous Oxalate as an Intermediate,
    Journal = EUROPEAN JOURNAL OF INORGANIC CHEMISTRY,
    Year = 2010,
    Number = 7,
    Pages = 1110-1118,
    Month = MAR,
    Abstract = The thermal decomposition of ferric oxalate tetrahydrate
       Fe(2)(C(2)O(4))(3)center dot 4H(2)O was studied in dynamic oxidative and
       inert atmospheres by using a simultaneous thermogravimetric (TG) and
       differential scanning calorimetric (DSC) analytical device equipped with
       an evolved gas analyzer (EGA). Solid-state decomposition products formed
       during the decomposition were analyzed by (57)Fe Mossbauer spectroscopy,
       in situ and ex situ X-ray powder diffraction, and magnetic measurements.
       In the dynamic inert atmosphere, we observed the formation of a tiny
       amount of superparamagnetic iron oxide (most likely Fe(3)O(4)) together
       with a majority of ferrous oxalate (FeC(2)O(4)) and remains of
       undecomposed Fe(2)(C(2)O(4))(3) after the first decomposition step,
       which finished at 210 degrees C. The astonishing presence of the oxidic
       phase at such low temperatures is a highly probable side effect of the
       main reduction action of the electrons on the Fe(III) cations in the
       ferric oxalate structure, thus resulting in the creation of intermediate
       FeC(2)O(4). The final product of decomposition of the FeC(2)O(4)
       intermediate in a dynamic inert atmosphere is a mixture of wustite
       (Fe(x)O), alpha-iron (alpha-Fe), and magnetite (Fe(3)O(4)). Their
       proportion accurately reflects actual
       disproportionation/synproportionation/redisproportionation processes
       likely encouraged by the preserved size and morphology of the initial
       ferric oxalate crystals and that are dependent on temperature. In the
       oxidative atmosphere, the decomposition proceeds in the three overlapped
       stages that include dehydration, the astonishing reductive formation of
       FeC(2)O(4) as an intermediate, and final decarboxylation to hematite
       (alpha-Fe(2)O(3)). The principal effect of the experimental conditions
       on the amount of intermediate formation of FeC(2)O(4) in the oxidative
       atmosphere is also discussed and evaluated from the isothermal
       experiments carried out at 180 degrees C.,
    DOI = 10.1002/ejic.200900835,
    ISSN = 1434-1948,
    Unique-ID = ISI:000275695200014,
    
  • [DOI] P. Dallas, R. Zboril, A. B. Bourlinos, D. Jancik, D. Niarchos, A. Panacek, and D. Petridis, "Cornet-Like Phosphotriazine/Diamine Polymers as Reductant and Matrix for
    the Synthesis of Silver Nanocomposites with Antimicrobial Activity," MACROMOLECULAR MATERIALS AND ENGINEERING, vol. 295, iss. 2, pp. 108-114, 2010.
    [Bibtex]
    @article ISI:000275287400003,
    Author = Dallas, Panagiotis and Zboril, Radek and Bourlinos, Athanasios B. and
       Jancik, Dalibor and Niarchos, Dimitrios and Panacek, Ales and Petridis,
       Dimitrios,
    Title = Cornet-Like Phosphotriazine/Diamine Polymers as Reductant and Matrix for
       the Synthesis of Silver Nanocomposites with Antimicrobial Activity,
    Journal = MACROMOLECULAR MATERIALS AND ENGINEERING,
    Year = 2010,
    Volume = 295,
    Number = 2,
    Pages = 108-114,
    Month = FEB 12,
    Abstract = The synthesis of silver nanoparticles attached on the surface of a
       hollow cornet-like polymer matrix which served as a reductant and host
       matrix is described. This hybrid organic/inorganic macromolecular matrix
       is exhibiting anion-exchange properties, porous structure and hollow
       morphologies, and absorptions in the visible light region. Due to the
       anion-exchange property and the 3D orientation of the macromolecular
       chains the material is defining a new functional organic/inorganic
       hybrid. For the synthesis of nanoparticles, no other reducing agents
       were used and silver nanoparticles with a mean diameter of less than 20
       nm were attached on the surface of the polymer, thus inheriting the
       composite with high antibacterial activity tested in bacterial strains
       and yeasts.,
    DOI = 10.1002/mame.200900258,
    ISSN = 1438-7492,
    Unique-ID = ISI:000275287400003,
    
  • [DOI] A. Bakandritsos, R. Zboril, N. Bouropoulos, P. Kallinteri, M. E. Favretto, T. L. Parker, A. Mullertz, and D. G. Fatouros, "The preparation of magnetically guided lipid based nanoemulsions using
    self-emulsifying technology," NANOTECHNOLOGY, vol. 21, iss. 5, 2010.
    [Bibtex]
    @article ISI:000273348400004,
    Author = Bakandritsos, Aristides and Zboril, Radek and Bouropoulos, Nikolaos and
       Kallinteri, Paraskevi and Favretto, Marco E. and Parker, Terry L. and
       Mullertz, Anette and Fatouros, Dimitrios G.,
    Title = The preparation of magnetically guided lipid based nanoemulsions using
       self-emulsifying technology,
    Journal = NANOTECHNOLOGY,
    Year = 2010,
    Volume = 21,
    Number = 5,
    Month = FEB 5,
    Abstract = This paper reports an easy and highly reproducible preparation route,
       using self-emulsifying technology, for an orally administered high
       quality magnetically responsive drug delivery system. Hydrophobic iron
       oxide nanoparticles of about 5 nm in diameter were prepared and
       incorporated into the lipid core of the produced oil droplets of a
       self-nanoemulsifying drug delivery system (MagC(18)/SNEDDS). The
       produced nanoemulsion exhibits colloidal stability at high ionic
       strengths and temperatures. The observed value of the saturation
       magnetization at 2 K is approximate to 4.1 emu g(-1). The nanoemulsion
       displayed the magnetic properties of a non-interacting assembly of
       superparamagnetic particles and a low blocking temperature. Moreover the
       effect of MagC(18)/SNEDDS on biological systems in vitro was
       investigated in rodent fibroblasts (3T3 cells). The cytotoxicity studies
       show that none of the formulations tested affected cell activity
       significantly over the 24 h incubation. Such systems might have a
       potential use for oral delivery of poorly soluble compounds by extending
       the residence time of the formulation in the small intestine resulting
       in increased drug absorption values.,
    DOI = 10.1088/0957-4484/21/5/055104,
    Article-Number = 055104,
    ISSN = 0957-4484,
    Unique-ID = ISI:000273348400004,
    
  • [DOI] V. Georgakilas, A. B. Bourlinos, R. Zboril, T. A. Steriotis, P. Dallas, A. K. Stubos, and C. Trapalis, "Organic functionalisation of graphenes," CHEMICAL COMMUNICATIONS, vol. 46, iss. 10, pp. 1766-1768, 2010.
    [Bibtex]
    @article ISI:000274827000053,
    Author = Georgakilas, Vasilios and Bourlinos, Athanasios B. and Zboril, Radek and
       Steriotis, Theodore A. and Dallas, Panagiotis and Stubos, Athanasios K.
       and Trapalis, Christos,
    Title = Organic functionalisation of graphenes,
    Journal = CHEMICAL COMMUNICATIONS,
    Year = 2010,
    Volume = 46,
    Number = 10,
    Pages = 1766-1768,
    Abstract = Graphene sheets derived from dispersion of graphite in pyridine were
       functionalised by the 1,3 dipolar cycloaddition of azomethine ylide. The
       organically modified graphene sheets are easily dispersible in polar
       organic solvents and water, and they are extensively characterised using
       several spectroscopic and microscopy techniques.,
    DOI = 10.1039/b922081j,
    ISSN = 1359-7345,
    Unique-ID = ISI:000274827000053,
    
  • [DOI] V. Tzitzios, G. Basina, A. Bakandritsos, C. G. Hadjipanayis, H. Mao, D. Niarchos, G. C. Hadjipanayis, J. Tucek, and R. Zboril, "Immobilization of magnetic iron oxide nanoparticles on laponite discs -
    an easy way to biocompatible ferrofluids and ferrogels," JOURNAL OF MATERIALS CHEMISTRY, vol. 20, iss. 26, pp. 5418-5428, 2010.
    [Bibtex]
    @article ISI:000279046200007,
    Author = Tzitzios, Vassilios and Basina, Georgia and Bakandritsos, Aristides and
       Hadjipanayis, Costas G. and Mao, Hui and Niarchos, Dimitrios and
       Hadjipanayis, George C. and Tucek, Jiri and Zboril, Radek,
    Title = Immobilization of magnetic iron oxide nanoparticles on laponite discs -
       an easy way to biocompatible ferrofluids and ferrogels,
    Journal = JOURNAL OF MATERIALS CHEMISTRY,
    Year = 2010,
    Volume = 20,
    Number = 26,
    Pages = 5418-5428,
    Abstract = Magnetic nanocomposites containing iron oxide (maghemite -
       gamma-Fe(2)O(3)) nanoparticles, embedded in a synthetic clay matrix
       (laponite) were prepared by a new one step chemical route and
       characterized by TEM, XRD, magnetization measurements, Mossbauer
       spectroscopy, DLS, and MRI measurements. The synthesis procedure leads
       to non-stoichiometric gamma-Fe(2)O(3) with a controllable content in the
       nanocomposite. Magnetic nanoparticles incorporated in the diamagnetic
       clay matrix exhibit a mean diameter of 13 nm and superparamagnetic
       behaviour with a high saturation magnetization achievable at low applied
       magnetic fields. The in-field Mossbauer spectra and ZFC/FC magnetization
       curves reveal a perfect ferrimagnetic ordering within nanoparticles with
       negligible spin frustration and interparticle interactions due to the
       incorporation of maghemite nanoparticles into the nanocrystalline
       laponite matrix, thus, significantly avoiding their clustering and
       agglomeration. Magnetic iron oxide nanoparticles embedded in the
       laponite matrix exhibit strong T(2)-weighted MRI contrast. The
       gamma-Fe(2)O(3)/laponite nanocomposite particles have a 200 nm
       hydrodynamic diameter and form very stable hydrosols and/or hydrogels
       depending on their concentration in water.,
    DOI = 10.1039/c0jm00061b,
    ISSN = 0959-9428,
    Unique-ID = ISI:000279046200007,
    
  • [DOI] A. Bakandritsos, G. Mattheolabakis, R. Zboril, N. Bouropoulos, J. Tucek, D. G. Fatouros, and K. Avgoustakis, "Preparation, stability and cytocompatibility of magnetic/PLA-PEG hybrids," NANOSCALE, vol. 2, iss. 4, pp. 564-572, 2010.
    [Bibtex]
    @article ISI:000276469800015,
    Author = Bakandritsos, Aristides and Mattheolabakis, George and Zboril, Radek and
       Bouropoulos, Nikolaos and Tucek, Jiri and Fatouros, Dimitrios G. and
       Avgoustakis, Konstantinos,
    Title = Preparation, stability and cytocompatibility of magnetic/PLA-PEG hybrids,
    Journal = NANOSCALE,
    Year = 2010,
    Volume = 2,
    Number = 4,
    Pages = 564-572,
    Abstract = Hybrid nanocolloids based on biodegradable polymers of poly(lactide)
       (PLA) or poly(lactide)-block-poly(ethylene glycol) (PLA-PEG) and
       hydrophobic iron oxide magnetic nanoparticles (MNPs) of ca. 5 nm are
       prepared via a self-assembly route. The magnetic nanoparticles are
       organized in superclusters inside the hydrophobic core of PLA-PEG
       micelles or cholate-stabilized PLA nanospheres. The hydrodynamic
       diameter of MNPs-loaded PLA nanospheres is similar to 250 nm, whereas
       that of MNPs-loaded PLA-PEG micelles is much lower (similar to 100 nm)
       and thus compatible with applications where prolonged blood circulation
       is required. The PLA-PEG micelles exhibit high encapsulation efficiency
       for the MNPs, imparting a saturation magnetization value to the hybrid
       of 8.4 emu g(-1). Both hybrid colloids display magnetic properties of a
       non-interacting assembly of superparamagnetic particles and a low
       blocking temperature, both of which are key attributes for colloidally
       stable ferrofluids. Furthermore, the PLA-PEG magnetic hybrids display
       remarkable colloidal stability at high ionic strength, temperature and
       in human blood plasma, while the estimated critical micelle
       concentration of ca. 2 x 10(-5) mM (0.3 mg L(-1)) indicates the low
       probability of the colloids dissociation in the blood compartment. They
       were also found to be non-toxic to human cells in vitro. The results
       underline the potential of the magnetic/PLA-PEG hybrids and encourage
       further research for their in vivo biomedical applications.,
    DOI = 10.1039/b9nr00253g,
    ISSN = 2040-3364,
    Unique-ID = ISI:000276469800015,
    
  • I. Markova, K. Kluchova, R. Zboril, M. Mashlan, and M. Herman, "SMALL BOWEL IMAGING - STILL A RADIOLOGIC APPROACH?," BIOMEDICAL PAPERS-OLOMOUC, vol. 154, iss. 2, pp. 123-132, 2010.
    [Bibtex]
    @article ISI:000279802800003,
    Author = Markova, Ingrid and Kluchova, Katerina and Zboril, Radek and Mashlan,
       Miroslav and Herman, Miroslav,
    Title = SMALL BOWEL IMAGING - STILL A RADIOLOGIC APPROACH?,
    Journal = BIOMEDICAL PAPERS-OLOMOUC,
    Year = 2010,
    Volume = 154,
    Number = 2,
    Pages = 123-132,
    Abstract = Background. In recent years, there has been renewed interest in small
       bowel imaging using a variety of radiologic or endoscopic techniques.
       This article gives an overview and comparison of old and new techniques
       used in small bowel imaging. New imaging methods as computed tomography
       (CT), CT enteroclysis (CTEc), CT enterography (CTEg), ultrasound (US),
       contrast-enhanced ultrasound (CEUS), US enteroclysis, US enterography,
       magnetic resonance imaging (MRI), MR enteroclysis (MREc) and MR
       enterography (MREg) are compared with the older techniques such as
       small-bowel follow-through (SBFT), conventional enteroclysis (CE) and
       endoscopic techniques including push enteroscopy,
       ezofagogastroduodenoscopy (EGD), sonde enteroscopy, ileocolonoscopy,
       double-balloon enteroscopy, intraoperative enteroscopy and wireless
       capsule enteroscopy (WCE).
       Methods. Systematic scan of Pubmed, Medline, Ovid, Elsevier search
       engines was used.. Additional information was found through the
       bibliographical review of relevant articles.
       Results. SBFT has only secondary role in small bowel imaging. US is
       still the method of choice in imaging for pediatric populations. US and
       CEUS are also accepted as a method of choice especially in inflammatory
       cases. CE has been replaced by new cross - sectional imaging techniques
       (CTEc/CTEg or MREc/MREg). CTEc combines the advantages of CT and CE.
       MREc combines the advantages of MRI and CE. Some authors prefer CTEg or
       MREg with peroral bowel preparation and they strictly avoid nasojejunal
       intubation under fluoroscopic control. MREc has better soft tissue
       contrast, showing it to be more sensitive in detecting mucosal lesions
       than CTEc in inflammatory diseases. CTEg/MREg are techniques preferred
       for patients in follow-up of the inflammatory diseases. The radiologic
       community is not unanimous however about their role in the imaging
       process. CTEc/MREc as well as CTEg/MREg are superior to endoscopic
       methods in the investigation of small-bowel tumors. WCE gives
       unparalleled imaging of the mucosal surface of the small bowel
       especially in the event of obscure gastrointestinal bleeding and
       inflammatory diseases.
       Conclusions. In a comparison of endoscopic and radiologic approaches,
       radiologic techniques are less invasive for patients, they take less
       time to investigate and allow imaging the entire small bowel. Some do
       not involve radiation exposure (US, MR). Endoscopic methods are more
       expensive, more invasive, need longer examination time and technical
       special skills but without radiation exposure. The greatest advantage of
       some endoscopic methods is the possibility of mucosal biopsy in one step
       with diagnostic examination (EGD, push enteroscopy, intraoperative
       enteroscopy, ileocolonoscopy).,
    ISSN = 1213-8118,
    Unique-ID = ISI:000279802800003,
    
  • [DOI] J. Cuda, R. Zboril, O. Schneeweiss, J. Tucek, V. Prochazka, M. Maslan, and P. Tucek, "Mossbauer Study and Macroscopic/Global Magnetic Behavior of Powdered
    Ilmenite (FeTiO(3)) Sample," in MOSSBAUER SPECTROSCOPY IN MATERIALS SCIENCE - 2010, 2010, pp. 55-67.
    [Bibtex]
    @inproceedings ISI:000281606200008,
    Author = Cuda, J. and Zboril, R. and Schneeweiss, O. and Tucek, J. and Prochazka,
       V. and Maslan, M. and Tucek, P.,
    Editor = Tucek, J and Miglierini, M,
    Title = Mossbauer Study and Macroscopic/Global Magnetic Behavior of Powdered
       Ilmenite (FeTiO(3)) Sample,
    Booktitle = MOSSBAUER SPECTROSCOPY IN MATERIALS SCIENCE - 2010,
    Series = AIP Conference Proceedings,
    Year = 2010,
    Volume = 1258,
    Pages = 55-67,
    Note = International Conference on Mossbauer Spectroscopy in Materials Science,
       Liptovsky Jan, SLOVAKIA, JAN 31-FEB 05, 2010,
    Abstract = In this article, the commercial synthetic powdered sample of ilmenite
       (FeTiO(3)) has been re-examined by Mossbauer spectroscopy in the
       paramagnetic regime from 77 K to 280 K and in a magnetically ordered
       state below 57 K. The effective vibrating mass and the Debye temperature
       was found to be (78 +/- 3) amu and (359 +/- 27) K, respectively. The two
       sextet components were used for correct fitting of the Mossbauer spectra
       recorded at 5 K and 45 K in an external magnetic field of 5 T. Moreover,
       the macroscopic magnetic measurements were carried out by an MPMS XL-7
       magnetometer to determine a temperature dependence of the molar
       susceptibility and hysteresis loops of this sample. The Mossbauer
       spectra and magnetization measurements confirm that below the ordering
       temperature of ilmenite, it behaves as a non-ideal antiferromagnetic
       material with a significant magnetic hardening at low temperatures. In
       addition, the magnetic molar susceptibility follows a Curie-Weiss law
       with C(m) = 5.8 x 10(-5) K m(3)/mol, and Weiss temperature theta(p) =
       30.6 K.,
    DOI = 10.1063/1.3473899,
    ISSN = 0094-243X,
    ISBN = 978-0-7354-0806-7,
    Unique-ID = ISI:000281606200008,
    

2009

  • [DOI] A. B. Bourlinos, V. Georgakilas, R. Zboril, T. A. Steriotis, A. K. Stubos, and C. Trapalis, "Aqueous-phase exfoliation of graphite in the presence of
    polyvinylpyrrolidone for the production of water-soluble graphenes," SOLID STATE COMMUNICATIONS, vol. 149, iss. 47-48, pp. 2172-2176, 2009.
    [Bibtex]
    @article ISI:000271843400013,
    Author = Bourlinos, Athanasios B. and Georgakilas, Vasilios and Zboril, Radek and
       Steriotis, Theodore A. and Stubos, Athanasios K. and Trapalis, Christos,
    Title = Aqueous-phase exfoliation of graphite in the presence of
       polyvinylpyrrolidone for the production of water-soluble graphenes,
    Journal = SOLID STATE COMMUNICATIONS,
    Year = 2009,
    Volume = 149,
    Number = 47-48,
    Pages = 2172-2176,
    Month = DEC,
    Abstract = Treatment of crystalline graphite fine powder with an aqueous solution
       of the harmless and versatile substance polyvinylpyrrolidone under
       sonication results in water-soluble, polymer-protected graphene single
       layers without oxidation or destruction of the sp(2) character of the
       carbon core. The liquid-phase extraction of graphene monolayers was
       evidenced by TEM and AFM techniques, while their graphitic character was
       checked with Raman spectroscopy. Besides PVP, the water-soluble
       biopolymers albumin and sodic carboxymethylcellulose were also employed
       successfully in the aqueous-phase exfoliation of graphite, thereby
       supporting the generic character of the present method using a variety
       of suitable polymeric extractants. (C) 2009 Elsevier Ltd. All rights
       reserved.,
    DOI = 10.1016/j.ssc.2009.09.018,
    ISSN = 0038-1098,
    Unique-ID = ISI:000271843400013,
    
  • [DOI] A. Panacek, M. Kolar, R. Vecerova, R. Prucek, J. Soukupova, V. Krystof, P. Hamal, R. Zboril, and L. Kvitek, "Antifungal activity of silver nanoparticles against Candida spp.," BIOMATERIALS, vol. 30, iss. 31, pp. 6333-6340, 2009.
    [Bibtex]
    @article ISI:000270767300020,
    Author = Panacek, Ales and Kolar, Milan and Vecerova, Renata and Prucek, Robert
       and Soukupova, Jana and Krystof, Vladimir and Hamal, Petr and Zboril,
       Radek and Kvitek, Libor,
    Title = Antifungal activity of silver nanoparticles against Candida spp.,
    Journal = BIOMATERIALS,
    Year = 2009,
    Volume = 30,
    Number = 31,
    Pages = 6333-6340,
    Month = NOV,
    Abstract = The antifungal activity of the silver nanoparticles (NPs) prepared by
       the modified Tollens process was evaluated for pathogenic Candida spp.
       by means of the determination of the minimum inhibitory concentration
       (MIC), minimum fungicidal concentration (MFC), and the time-dependency
       of yeasts growth inhibition. Simultaneously the cytotoxicity of the
       silver NPs to human fibroblasts was determined. The silver NPs exhibited
       inhibitory effect against the tested yeasts at the concentration as low
       as 0.21 mg/L of Ag. The inhibitory effect of silver NPs was enhanced
       through their stabilization and the lowest MIC equal to 0.05 mg/L was
       determined for silver NPs stabilized by sodium dodecyl sulfate against
       Candida albicans II. The obtained MICs of the silver NPs and especially
       of the stabilized silver NPs were comparable and in some cases even
       better than MICs of the conventional antifungal agents determined by
       E-test. The silver NPs effectively inhibited the growth of the tested
       yeasts at the concentrations below their cytotoxic limit against the
       tested human fibroblasts determined at a concentration equal to 30 mg/L
       of Ag. In contrast, ionic silver inhibited the growth of the tested
       yeasts at the concentrations comparable to the cytotoxic level (approx.
       1 mg/L) of ionic silver against the tested human fibroblasts. (C) 2009
       Elsevier Ltd. All rights reserved.,
    DOI = 10.1016/j.biomaterials.2009.07.065,
    ISSN = 0142-9612,
    Unique-ID = ISI:000270767300020,
    
  • [DOI] R. Prucek, M. Hermanek, and R. Zboril, "An effect of iron(III) oxides crystallinity on their catalytic
    efficiency and applicability in phenol degradation-A competition between
    homogeneous and heterogeneous catalysis," APPLIED CATALYSIS A-GENERAL, vol. 366, iss. 2, pp. 325-332, 2009.
    [Bibtex]
    @article ISI:000270644800014,
    Author = Prucek, Robert and Hermanek, Martin and Zboril, Radek,
    Title = An effect of iron(III) oxides crystallinity on their catalytic
       efficiency and applicability in phenol degradation-A competition between
       homogeneous and heterogeneous catalysis,
    Journal = APPLIED CATALYSIS A-GENERAL,
    Year = 2009,
    Volume = 366,
    Number = 2,
    Pages = 325-332,
    Month = SEP 25,
    Abstract = Catalytic efficiency, stability and environmental applicability of five
       iron(III) oxide nanopowders differing in surface area and crystallinity
       were tested in degradation of concentrated phenolic aqueous solutions
       (100 g/L) at mild temperature (30 degrees C), initially almost neutral
       pH and equimolar ratio of hydrogen peroxide and phenol. The catalyst
       properties were easily controlled by varying in reaction time during
       isothermal treatment of ferrous oxalate dihydrate in air at 175 degrees
       C. Although the catalytic efficiency clearly increases with the surface
       area of the nanopowders, it is not due to the solely heterogeneous
       catalytic mechanism as would be expected. The amorphous Fe(2)O(3)
       nanopowders possessing the largest surface areas (401 m(2) g(-1), 386
       m(2) g(-1)) are the most efficient catalysts evidently due to their
       highest susceptibility to leaching in acidic environment arising as a
       consequence of phenol degradation products. Thus, these amorphous
       samples act partially as homogeneous catalysts, which was confirmed by a
       high concentration of leached Fe(III) ions in the solution (similar to
       19 ppm). The crystalline hematite (alpha-Fe(2)O(3)) samples, varying in
       surface area between 337 m(2) g(-1) and 245 m(2) g(-1), are generally
       less efficient when compared to the amorphous powders, however their
       catalytic action is almost exclusively heterogeneous as only 3 ppm of
       leached Fe(III) was found in the reaction systems catalyzed by
       nanohematite samples. A significant difference in relative contributions
       of heterogeneous and homogenous catalysis was definitely established in
       buffered reaction systems catalyzed by amorphous Fe(2)O(3) and
       nanocrystalline hematite. The nanohematite sample exhibiting the highest
       heterogeneous action was tested at decreased initial phenol
       concentration (10 g/L), which is closer to the real contents of phenol
       in waste waters, and at different hydrogen peroxide/phenol molar ratios
       to consider its environmental applicability. At the hydrogen
       peroxide/phenol ratio equal to 5, no traces of the leached iron were
       detected and the phenol conversion of 84\% was reached. Moreover, such a
       high degree of conversion is accompanied by a decrease of the chemical
       oxygen demand (COD) from the initial value of 11.23 g/L to 4.22 g/L
       after 125 min. This fact indicates that the considerable fraction of
       primary reaction products was totally degraded. (C) 2009 Elsevier B.V.
       All rights reserved.,
    DOI = 10.1016/j.apcata.2009.07.019,
    ISSN = 0926-860X,
    Unique-ID = ISI:000270644800014,
    
  • [DOI] A. B. Bourlinos, V. Georgakilas, R. Zboril, T. A. Steriotis, and A. K. Stubos, "Liquid-Phase Exfoliation of Graphite Towards Solubilized Graphenes," SMALL, vol. 5, iss. 16, pp. 1841-1845, 2009.
    [Bibtex]
    @article ISI:000269227800006,
    Author = Bourlinos, Athanasios B. and Georgakilas, Vasilios and Zboril, Radek and
       Steriotis, Theodore A. and Stubos, Athanasios K.,
    Title = Liquid-Phase Exfoliation of Graphite Towards Solubilized Graphenes,
    Journal = SMALL,
    Year = 2009,
    Volume = 5,
    Number = 16,
    Pages = 1841-1845,
    Month = AUG 17,
    DOI = 10.1002/smll.200900242,
    ISSN = 1613-6810,
    Unique-ID = ISI:000269227800006,
    
  • [DOI] K. Kluchova, R. Zboril, J. Tucek, M. Pecova, L. Zajoncova, I. Safarik, M. Mashlan, I. Markova, D. Jancik, M. Sebela, H. Bartonkova, V. Bellesi, P. Novak, and D. Petridis, "Superparamagnetic maghemite nanoparticles from solid-state synthesis -
    Their functionalization towards peroral MRI contrast agent and magnetic
    carrier for trypsin immobilization," BIOMATERIALS, vol. 30, iss. 15, pp. 2855-2863, 2009.
    [Bibtex]
    @article ISI:000265328100001,
    Author = Kluchova, Katerina and Zboril, Radek and Tucek, Jiri and Pecova,
       Michaela and Zajoncova, Ludmila and Safarik, Ivo and Mashlan, Miroslav
       and Markova, Ingrid and Jancik, Dalibor and Sebela, Marek and
       Bartonkova, Helena and Bellesi, Vassiliki and Novak, Pavel and Petridis,
       Dimitris,
    Title = Superparamagnetic maghemite nanoparticles from solid-state synthesis -
       Their functionalization towards peroral MRI contrast agent and magnetic
       carrier for trypsin immobilization,
    Journal = BIOMATERIALS,
    Year = 2009,
    Volume = 30,
    Number = 15,
    Pages = 2855-2863,
    Month = MAY,
    Abstract = Nearly monodispersed superparamagnetic maghemite nanoparticles (15-20
       nm) were prepared by a one-step thermal decomposition of iron(II)
       acetate in air at 400 degrees C. The presented synthetic route is
       simple, cost effective and allows to prepare the high-quality
       superparamagnetic particles in a large scale. The as-prepared particles
       were exploited for the development of magnetic nanocomposites with the
       possible applicability in medicine and biochemistry. For the purposes of
       the MRI diagnostics, the maghemite particles were simply dispersed in
       the bentonite matrix. The resulting nanocomposite represents very
       effective and cheap oral negative contrast agent for MRI of the
       gastrointestinal tract and reveals excellent contrast properties, fully
       comparable with those obtained for commercial contrast material. The
       results of the clinical research of this maghemite-bentonite contrast
       agent for imaging of the small bowel are discussed. For biochemical
       applications, the primary functionalization of the prepared maghemite
       nanoparticles with chitosan was performed. In this way, a highly
       efficient magnetic carrier for protein immobilization was obtained as
       demonstrated by conjugating thermostable raffinose-modified trypsin
       (RMT) using glutaraldehyde. The covalent conjugation resulted in a
       further increase in trypsin thermostability (T(50) = 61 degrees C) and
       elimination of its autolysis. Consequently, the immobilization of RMT
       allowed fast in-solution digestion of proteins and their identification
       by MALDI-TOF mass spectrometry. (C) 2009 Elsevier Ltd. All rights
       reserved.,
    DOI = 10.1016/j.biomaterials.2009.02.023,
    ISSN = 0142-9612,
    Unique-ID = ISI:000265328100001,
    
  • [DOI] V. Belessi, D. Lambropoulou, I. Konstantinou, R. Zboril, J. Tucek, D. Jancik, T. Albanis, and D. Petridis, "Structure and photocatalytic performance of magnetically separable
    titania photocatalysts for the degradation of propachlor," APPLIED CATALYSIS B-ENVIRONMENTAL, vol. 87, iss. 3-4, pp. 181-189, 2009.
    [Bibtex]
    @article ISI:000264948000006,
    Author = Belessi, V. and Lambropoulou, D. and Konstantinou, I. and Zboril, R. and
       Tucek, J. and Jancik, D. and Albanis, T. and Petridis, D.,
    Title = Structure and photocatalytic performance of magnetically separable
       titania photocatalysts for the degradation of propachlor,
    Journal = APPLIED CATALYSIS B-ENVIRONMENTAL,
    Year = 2009,
    Volume = 87,
    Number = 3-4,
    Pages = 181-189,
    Month = APR 7,
    Abstract = A magnetic photocatalyst was prepared by modification of TiO(2)
       nanoparticles (Degussa P25) with nanocrystalline gamma-Fe(2)O(3)
       nanoparticles through a protective lining made up of two oppositely
       charged polyelectrolytes. As-prepared magnetically separable
       photocatalysts differing in gamma-Fe(2)O(3) loading (3, 8, 13, 20 and 30
       wt.\%) were characterized by XRD, TEM, thermal analysis, Mossbauer and
       magnetic measurements. The photocatalytic efficiency of the
       nanocomposite catalysts was evaluated using a chloroacetanilide
       herbicide (propachlor) in water as model compound. The primary
       degradation of propachlor followed pseudo-first-order kinetics according
       to the Langmuir-Hinshelwood model. Generally, all magnetic
       photocatalysts exhibit good catalytic activity towards organic
       pollutants, do not suffer from photodissolution and can be reused
       several times without any decrease in their photocatalytic activity. (C)
       2008 Published by Elsevier B.V.,
    DOI = 10.1016/j.apcatb.2008.09.012,
    ISSN = 0926-3373,
    Unique-ID = ISI:000264948000006,
    
  • [DOI] L. Kvitek, M. Vanickova, A. Panacek, J. Soukupova, M. Dittrich, E. Valentova, R. Prucek, M. Bancirova, D. Milde, and R. Zboril, "Initial Study on the Toxicity of Silver Nanoparticles (NPs) against
    Paramecium caudatum," JOURNAL OF PHYSICAL CHEMISTRY C, vol. 113, iss. 11, pp. 4296-4300, 2009.
    [Bibtex]
    @article ISI:000264111300013,
    Author = Kvitek, Libor and Vanickova, Marketa and Panacek, Ales and Soukupova,
       Jana and Dittrich, Milan and Valentova, Eva and Prucek, Robert and
       Bancirova, Martina and Milde, David and Zboril, Radek,
    Title = Initial Study on the Toxicity of Silver Nanoparticles (NPs) against
       Paramecium caudatum,
    Journal = JOURNAL OF PHYSICAL CHEMISTRY C,
    Year = 2009,
    Volume = 113,
    Number = 11,
    Pages = 4296-4300,
    Month = MAR 19,
    Abstract = In this initial study, the toxicity effect of silver NPs against a model
       unicellular eukaryotic organism of Paramecium caudatum was studied. For
       the purpose of this study, a dialysis-based method was adapted, which
       allowed the preparation of stable aqueous dispersions of silver NPs in
       various silver concentrations that were necessary for the evaluation of
       toxicity limits of these particles. The obtained results demonstrate
       that the silver NPs do not exhibit any toxicity action against the
       tested unicellular eukaryotic organism below the concentration of 25 mg
       . L(-1) whereas ionic silver retains its toxicity even at a
       concentration of 0.4 mg . L(-1). Such a considerable difference in the
       toxicity effect of these two forms of silver has not been observed in
       the previously published study concerning bacteria (Panacek, A.; Kvitek,
       L.; Prucek, R.; Koldr, M.; Vecefova, R.; Pizurova, N.; Sharma, V. K.;
       Nevecna, T.; Zboril, R. J. Phys. Chem. B 2006, 110, 16248-16253).
       Additionally, it was proven that the surfactant/polymer modification can
       increase the toxicity of the silver NPs against the tested organism.,
    DOI = 10.1021/jp808645e,
    ISSN = 1932-7447,
    Unique-ID = ISI:000264111300013,
    
  • [DOI] A. B. Bourlinos, T. A. Steriotis, R. Zboril, V. Georgakilas, and A. Stubos, "Direct synthesis of carbon nanosheets by the solid-state pyrolysis of
    betaine," JOURNAL OF MATERIALS SCIENCE, vol. 44, iss. 5, pp. 1407-1411, 2009.
    [Bibtex]
    @article ISI:000263379500035,
    Author = Bourlinos, Athanasios B. and Steriotis, Theodore A. and Zboril, Radek
       and Georgakilas, Vasilios and Stubos, Athanasios,
    Title = Direct synthesis of carbon nanosheets by the solid-state pyrolysis of
       betaine,
    Journal = JOURNAL OF MATERIALS SCIENCE,
    Year = 2009,
    Volume = 44,
    Number = 5,
    Pages = 1407-1411,
    Month = MAR,
    DOI = 10.1007/s10853-009-3263-8,
    ISSN = 0022-2461,
    Unique-ID = ISI:000263379500035,
    
  • [DOI] L. Machala, R. Zboril, V. K. Sharma, J. Filip, D. Jancik, and Z. Homonnay, "Transformation of Solid Potassium Ferrate(VI) (K(2)FeO(4)): Mechanism
    and Kinetic Effect of Air Humidity," EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, iss. 8, pp. 1060-1067, 2009.
    [Bibtex]
    @article ISI:000264683200010,
    Author = Machala, Libor and Zboril, Radek and Sharma, Virender K. and Filip, Jan
       and Jancik, Dalibor and Homonnay, Zoltan,
    Title = Transformation of Solid Potassium Ferrate(VI) (K(2)FeO(4)): Mechanism
       and Kinetic Effect of Air Humidity,
    Journal = EUROPEAN JOURNAL OF INORGANIC CHEMISTRY,
    Year = 2009,
    Number = 8,
    Pages = 1060-1067,
    Month = MAR,
    Abstract = The kinetics of solid-state transformation (aging) of potassium
       ferrate(VI) (K(2)FeO(4)) under various air-humidity conditions (55-95\%
       relative humidity) at room temperature were studied by in-situ Mossbauer
       spectroscopy. The kinetic data showed a significant increase in the
       decomposition rate with increasing air humidity. The decomposition
       kinetics is very unusual with two almost linear decay steps. The first
       slow decay was observable at rather lower humidity levels (55-70\%)
       probably due to the formation of the narrow compact layer of
       nanoparticulate Fe(OH)(3) reaction product. This layer limits the access
       of both H(2)O and CO(2) participating in the reaction as the gaseous
       reactants. The second decay with much faster rate showed a nearly
       positive linear relationship with the humidity. The identification and
       characterization of the final products of aging were conducted by using
       X-ray diffraction (XRD), variable-temperature and in-field Mossbauer
       spectroscopy, magnetic measurements, thermogravimetry (TG) and
       differential scanning calorimetry (DSC), and scanning electron
       microscopy (SEM) techniques. The reaction mechanism, assuming formation
       of KHCO(3) and Fe(OH)(3) in the molar ratio of 2:1 per 1 mol of solid
       K(2)FeO(4) was suggested. The SEM images revealed the formation of large
       KHCO(3) crystallites whose surface was covered by ultrasmall X-ray
       amorphous iron(III) hydroxide nanoparticles in a high degree of
       agglomeration. The obtained results of aging under humid conditions are
       important for the possible storage of K(2)FeO(4) and thus for its
       environmental and industrial applications. ((C) Wiley-VCH Verlag GmbH \&
       Co. KGaA, 69451 Weinheim, Germany, 2009),
    DOI = 10.1002/ejic.200801068,
    ISSN = 1434-1948,
    Unique-ID = ISI:000264683200010,
    
  • [DOI] A. B. Bourlinos, V. Georgakilas, R. Zboril, A. Bakandritsos, A. Stassinopoulos, D. Anglos, and E. P. Giannelis, "Pyrolytic formation and photoluminescence properties of a new layered
    carbonaceous material with graphite oxide-mimicking characteristics," CARBON, vol. 47, iss. 2, pp. 519-526, 2009.
    [Bibtex]
    @article ISI:000262558300019,
    Author = Bourlinos, A. B. and Georgakilas, V. and Zboril, R. and Bakandritsos, A.
       and Stassinopoulos, A. and Anglos, D. and Giannelis, E. P.,
    Title = Pyrolytic formation and photoluminescence properties of a new layered
       carbonaceous material with graphite oxide-mimicking characteristics,
    Journal = CARBON,
    Year = 2009,
    Volume = 47,
    Number = 2,
    Pages = 519-526,
    Month = FEB,
    Abstract = Thermal carbonization of bis(2-chloroethyl)amine hydrochloride at 260
       degrees C in air leads to a new, functional layered carbonaceous
       material that, although different in structure and composition, shares
       similar characteristics as the well-known graphite oxide. Specifically,
       the molecularly derived carbonaceous solid is layered with relatively
       small lateral dimensions, highly dispersible in water providing clear
       colloidal sols and possesses ion-exchange properties. The carbonaceous
       solid strongly fluoresces in the visible, when stimulated with a wide
       range of excitation wavelengths. Overall, the method presents an
       alternative synthesis towards molecularly derived layered carbonaceous
       materials with novel properties. (C) 2008 Elsevier Ltd. All rights
       reserved.,
    DOI = 10.1016/j.carbon.2008.10.044,
    ISSN = 0008-6223,
    Unique-ID = ISI:000262558300019,
    
  • [DOI] I. Cesar, K. Sivula, A. Kay, R. Zboril, and M. Graetzel, "Influence of Feature Size, Film Thickness, and Silicon Doping on the
    Performance of Nanostructured Hematite Photoanodes for Solar Water
    Splitting," JOURNAL OF PHYSICAL CHEMISTRY C, vol. 113, iss. 2, pp. 772-782, 2009.
    [Bibtex]
    @article ISI:000262324600044,
    Author = Cesar, Ilkay and Sivula, Kevin and Kay, Andreas and Zboril, Radek and
       Graetzel, Michael,
    Title = Influence of Feature Size, Film Thickness, and Silicon Doping on the
       Performance of Nanostructured Hematite Photoanodes for Solar Water
       Splitting,
    Journal = JOURNAL OF PHYSICAL CHEMISTRY C,
    Year = 2009,
    Volume = 113,
    Number = 2,
    Pages = 772-782,
    Month = JAN 15,
    Abstract = Photoanodes consisting of nanostructured hematite prepared by
       atmospheric pressure chemical vapor deposition (APCVD) have previously
       set a benchmark for solar water splitting. Here, we fully investigate
       this promising system by varying critical synthetic parameters and
       probing the photoanode performance to determine the major factors that
       influence operation. By varying the film thickness, we show film growth
       to be linear with an incubation time. We find no concern with electron
       transport for films up to 600 nm, but a higher recombination rate of
       photogenerated carriers in the hematite near the interface with the
       fluorine-doped tin oxide, as compared to the bulk section of the film.
       ne mechanism for the formation of the thin film's nanoporous dendritic
       structure is discussed on the basis of the results from varying the
       substrate growth temperate. The observed feature sizes of the film are
       found to depend strongly on this temperature and the presence of silicon
       dopant precursor (TEOS). Raman and Mossbauer experiments reveal how
       temperature and doping affect the crystallinity and ultimately the
       photoperformance. We also use impedance spectroscopy to find evidence
       for an unusually high donor density, which allows the formation of a
       space-charge field inside the nanosized features of the polycrystalline
       hematite photoanode.,
    DOI = 10.1021/jp809060p,
    ISSN = 1932-7447,
    Unique-ID = ISI:000262324600044,
    
  • [DOI] R. Prucek, L. Kvitek, A. Panacek, L. Vancurova, J. Soukupova, D. Jancik, and R. Zboril, "Polyacrylate-assisted synthesis of stable copper nanoparticles and
    copper(I) oxide nanocubes with high catalytic efficiency," JOURNAL OF MATERIALS CHEMISTRY, vol. 19, iss. 44, pp. 8463-8469, 2009.
    [Bibtex]
    @article ISI:000271744600027,
    Author = Prucek, Robert and Kvitek, Libor and Panacek, Ales and Vancurova, Lenka
       and Soukupova, Jana and Jancik, Dalibor and Zboril, Radek,
    Title = Polyacrylate-assisted synthesis of stable copper nanoparticles and
       copper(I) oxide nanocubes with high catalytic efficiency,
    Journal = JOURNAL OF MATERIALS CHEMISTRY,
    Year = 2009,
    Volume = 19,
    Number = 44,
    Pages = 8463-8469,
    Abstract = The synthesis of Cu nanoparticles (NPs) via the reduction of Cu ions
       with sodium borohydride in the presence of sodium polyacrylate is
       presented. The final Cu nanocrystals having a 14 nm diameter were
       generated via the aggregation and coalescence of the primarily formed
       ultrasmall particles (approx. 3 nm). Addition of sodium sulfite to the
       dispersions provided the protection of the Cu NPs against oxidation. On
       the other hand, the controlled aeration of the Cu NPs resulted in their
       transformation to Cu(2)O nanocubes with an average size of 18 nm. Both
       Cu NPs and Cu(2)O nanocubes can effectively catalyze reduction of
       4-nitrophenol by sodium borohydride in aqueous solution.,
    DOI = 10.1039/b913561h,
    ISSN = 0959-9428,
    Unique-ID = ISI:000271744600027,
    
  • [DOI] R. Herchel, Z. Sindelar, Z. Travnicek, R. Zboril, and J. Vanco, "Novel 1D chain Fe(III)-salen-like complexes involving anionic
    heterocyclic N-donor ligands. Synthesis, X-ray structure, magnetic,
    (57)Fe Mossbauer, and biological activity studies," DALTON TRANSACTIONS, iss. 44, pp. 9870-9880, 2009.
    [Bibtex]
    @article ISI:000271432600028,
    Author = Herchel, Radovan and Sindelar, Zdenek and Travnicek, Zdenek and Zboril,
       Radek and Vanco, Jan,
    Title = Novel 1D chain Fe(III)-salen-like complexes involving anionic
       heterocyclic N-donor ligands. Synthesis, X-ray structure, magnetic,
       (57)Fe Mossbauer, and biological activity studies,
    Journal = DALTON TRANSACTIONS,
    Year = 2009,
    Number = 44,
    Pages = 9870-9880,
    Abstract = The iron(III) salen-type complexes [Fe(salen)(L)](n) (1-6) involving
       heterocyclic N-donor ligands HL \HL = 1H-imidazole (Himz),
       1H-tetrazol-5-amine (Hatz), 5-methyl-1H-tetrazole (Hmtz),
       1H-benzimidazole (Hbimz), 1H-1,2,4-triazole (Htriz) and 1H-benzotriazole
       (Hbtriz)\ have been prepared and characterised by elemental analysis,
       FT IR, CI mass and (57)Fe Mossbauer spectroscopies, and variable
       temperature magnetic measurements. Single crystal X-ray analysis of
       [Fe(salen)(btriz)](n) (6) revealed a 1D chain-polymeric structure of
       the complex with the btriz anion as a bridging ligand. Magnetic data for
       all complexes were fitted using Fisher's model (for S = 5/2) and also
       using a heptanuclear closed ring model showing a weak antiferromagnetic
       interaction (J approximate to -1 to -2 cm(-1)), and moreover,
       molecule-based magnet properties have been observed in the case of
       [Fe(salen)(atz)](n) (2). The exponential correlation between the
       magnetic properties (the isotropic exchange parameter J) and the
       basicity of the free ligands (K(b)) has been found. The
       antiferromagnetic ordering as well as a moderate structural
       dissimilarity in the vicinity of iron atoms has been proved by the
       (57)Fe Mossbauer low-temperature (2 K) in-field (7 T) experiments in the
       case of (2), in which two sextets with the line intensities
       (3/4/1/3/4/1) have been observed. The compounds have been tested for
       their SOD-like activity, DNA cleavage activity, and in vitro
       cytotoxicity against two human cancer cell lines: chronic myelogenous
       erythroleukemia (K562) and breast adenocarcinoma (MCF7). The best result
       regarding the cytotoxicity has been achieved for the complex of
       [Fe(salen)(atz)](n) (2), where IC(50) = 6.4 mu M against K562.,
    DOI = 10.1039/b912676g,
    ISSN = 1477-9226,
    Unique-ID = ISI:000271432600028,
    
  • Z. Markova, M. Pecova, L. Zajoncova, J. Zboril, and R. Zboril, "SURFACE ENGINEERING OF IRON OXIDE NANOPARTICLES ISOLATED FROM
    MAGNETOSPIRILLUM GRYPHISWALDENSE FOR BIOCHEMICAL AND BIOMEDICAL
    APPLICATIONS," in NANOCON 2009, CONFERENCE PROCEEDINGS, 2009, pp. 311-317.
    [Bibtex]
    @inproceedings ISI:000277025600047,
    Author = Markova, Zdenka and Pecova, Michaela and Zajoncova, Ludmila and Zboril,
       Jiri and Zboril, Radek,
    Book-Group-Author = TANGER, Ltd
       CSNMT
       MRSS
       NMS,
    Title = SURFACE ENGINEERING OF IRON OXIDE NANOPARTICLES ISOLATED FROM
       MAGNETOSPIRILLUM GRYPHISWALDENSE FOR BIOCHEMICAL AND BIOMEDICAL
       APPLICATIONS,
    Booktitle = NANOCON 2009, CONFERENCE PROCEEDINGS,
    Year = 2009,
    Pages = 311-317,
    Note = 1st NANOCON International Conference, Roznov pod Radhostem, CZECH
       REPUBLIC, OCT 20-22, 2009,
    Abstract = Superparamagnetic iron oxide nanoparticles with appropriate surface
       modification can be widely used in various applications including
       magnetic resonance imaging (MRI) diagnostic contrast agents, anticancer
       therapy using hyperthermia, magnetic drug targeting, protein and enzyme
       immobilization, cell labeling and separation or RNA and DNA purification
       All these biochemical and biomedical applications require nanoparticles
       exhibiting a high magnetization and narrow size distribution and
       possessing non-toxicity and biocompatibility
       As a result of biologically controlled preparation, biogenic magnetite
       (Fe(3)O(4)) nanoparticles have properties that make them intrinsically
       distinct from their synthetic counterparts Magnetotactic bacteria are
       microorganisms that are able to biomineralize the membrane-enveloped
       crystals of magnetite called magnetosomes Magnetospirillum
       gryphiswaldense, well laboratory cultured organism, produces
       cubooctahedral magnetite crystals ranging in size between 20 and 50 nm
       The fermentor cultivation under microaerobic conditions, commonly
       performed in our lab, leads to the sufficiently high cell yield
       (OD(565nm) similar to, 1 5) and to the suitable values of the parameter
       describing the cell magnetism (c(mag) similar to 1) Magnetosomes are
       consequently isolated from bacteria by method using neodynium boron
       (Nd-B) magnet. In the present work, we coated biogenic magnetite with
       substances that make them biocompatible, biodegradable, stable,
       non-toxic and accessible for binding with various active biocomponents
       depending on particular bioapplication The natural polymers such as
       chitosan, N-trimethylchitosan, carboxymethylchitosan or dextran have
       been used in a coating procedure and the properties of the core-shell
       systems have been analyzed by TEM, SEM and SQUID magnetic measurements
       The magnetite nanoparticles modified by chitosan exhibit the most
       perfect and complete surface stabilization as evidenced by the narrow
       and well defined shell. These nanoparticles were successfully tested in
       the trypsin immobilization for applications in proteomics, where they
       revealed the superior properties compared to the synthetic counterparts,
    ISBN = 978-80-87294-13-0,
    Unique-ID = ISI:000277025600047,
    

2008

  • [DOI] A. B. Bourlinos, V. Georgakilas, and R. Zboril, "Easy deposition of amorphous carbon films on glass substrates," CARBON, vol. 46, iss. 13, pp. 1801-1804, 2008.
    [Bibtex]
    @article ISI:000260736000024,
    Author = Bourlinos, A. B. and Georgakilas, V. and Zboril, R.,
    Title = Easy deposition of amorphous carbon films on glass substrates,
    Journal = CARBON,
    Year = 2008,
    Volume = 46,
    Number = 13,
    Pages = 1801-1804,
    Month = NOV,
    Abstract = The easy fabrication of amorphous carbon films on glass substrates is
       described. The films are obtained by a simple gas phase deposition
       technique that takes place in air under mild conditions (400 degrees C,
       ambient pressure). The experimental set-up is straightforward and can be
       routinely applied for the large-scale fabrication of high quality carbon
       films, while, the carbon source is a decomposable polymer precursor
       (polyvinylpyrrolidone, PVP). (C) 2008 Elsevier Ltd. All rights reserved.,
    DOI = 10.1016/j.carbon.2008.07.013,
    ISSN = 0008-6223,
    Unique-ID = ISI:000260736000024,
    
  • [DOI] T. M. Triantis, K. Papadopoulos, E. Yannakopoulou, D. Dimotikali, J. Hrbac, and R. Zboril, "Sensitized chemiluminescence of luminol catalyzed by colloidal
    dispersions of nanometer-sized ferric oxides," CHEMICAL ENGINEERING JOURNAL, vol. 144, iss. 3, pp. 483-488, 2008.
    [Bibtex]
    @article ISI:000261075300017,
    Author = Triantis, T. M. and Papadopoulos, K. and Yannakopoulou, E. and
       Dimotikali, D. and Hrbac, J. and Zboril, R.,
    Title = Sensitized chemiluminescence of luminol catalyzed by colloidal
       dispersions of nanometer-sized ferric oxides,
    Journal = CHEMICAL ENGINEERING JOURNAL,
    Year = 2008,
    Volume = 144,
    Number = 3,
    Pages = 483-488,
    Month = NOV 1,
    Abstract = Colloidal solutions of ferric oxide nanoparticles of different particle
       size and surface area characteristics enhance the intensity of the
       chemiluminescent (CL) reaction of luminol with hydrogen peroxide up to
       18-fold and accelerate the rate of the reaction time to 86-fold. The
       sample with the highest enhancement was applied in the determination of
       hydrogen peroxide and the estimation of hydrogen peroxide scavenging
       activity of selected antioxidant compounds. Hydrogen peroxide was
       determined down to 1.25 x 10(-3) M (S/N = 3). Regarding the hydrogen
       peroxide scavenging activities of the selected organic antioxidants it.
       was found that mono- and dihydroxylated phenols (tyrosol, catechin and
       caffeic acid) exhibit up to one order of magnitude higher scavenging
       activity than trihydroxylated phenols (gallic acid and pyrrogallic
       acid), vitamins E and C, and amino acid cysteine. (c) 2008 Elsevier B.V.
       All rights reserved.,
    DOI = 10.1016/j.cej.2008.07.035,
    ISSN = 1385-8947,
    Unique-ID = ISI:000261075300017,
    
  • [DOI] Z. Travnicek, J. Mikulik, M. Cajan, R. Zboril, and I. Popa, "Novel iron complexes bearing N6-substituted adenosine derivatives:
    Synthesis, magnetic, (57)Fe Mossbauer, DFT, and in vitro cytotoxicity
    studies," BIOORGANIC & MEDICINAL CHEMISTRY, vol. 16, iss. 18, pp. 8719-8728, 2008.
    [Bibtex]
    @article ISI:000259173400046,
    Author = Travnicek, Zdenek and Mikulik, Jiri and Cajan, Michal and Zboril, Radek
       and Popa, Igor,
    Title = Novel iron complexes bearing N6-substituted adenosine derivatives:
       Synthesis, magnetic, (57)Fe Mossbauer, DFT, and in vitro cytotoxicity
       studies,
    Journal = BIOORGANIC \& MEDICINAL CHEMISTRY,
    Year = 2008,
    Volume = 16,
    Number = 18,
    Pages = 8719-8728,
    Month = SEP 15,
    Abstract = Iron complexes (1-7) involving N6-benzyladenosine derivatives of the
       predominant composition [Fe(L(n))Cl(3)]center dot H(2)O \where L(1) =
       N6-(2-fluorobenzyl)adenosine (1), L(2) = N6-(4-fluorobenzyl)adenosine
       (2), L(3) = N6-(2-trifluoromethylbenzyl)adenosine (3), L(4) =
       N6-(3-trifluoromethylbenzyl)adenosine (4), L(5) =
       N6-(4-trifluoromethylbenzyl)adenosine (5), L(6) =
       N6-(4-trifluoromethoxybenzyl)adenosine (6), and L(7) =
       N6-(4-chlorobenzyl)adenosine (7)\ have been synthesized. The compounds
       have been characterized by elemental analysis, variable-temperature and
       in-field (57)Fe Mossbauer, ES+ MS, FTIR, (1)H and (13)C NMR
       spectroscopies, magnetochemical and conductivity measurements, thermal
       (TGA/DSC/DTA) analyses, and DFT calculations. It has been found that the
       organic molecule is coordinated to iron via N7 atom of the appropriate
       adenosine derivative and the products are represented by mixtures of
       complexes with various iron oxidation (Fe(III)/Fe(II)) and spin states
       (S = 5/2, 4/2, 3/2, 2/2) and geometries (tetrahedral or trigonal
       bipyramidal). It is caused by the fact that partial redox processes
       proceed during the reactions due to the presence of a ribose moiety,
       which is oxidized to the corresponding 5'-ribotic acid, and
       simultaneously, a portion of Fe(III) cations is reduced to Fe(II) ones.
       Moreover, a significant effect of crystal water molecules on
       stereochemistry, and hence, on magnetic and spectral properties of the
       prepared complexes has been found. The compounds have been tested for
       their in vitro cytotoxicity against the following human cancer cell
       lines: malignant melanoma (G-361), osteogenic sarcoma (HOS), chronic
       myelogenous leukemia (K-562), and breast adenocarcinoma (MCF-7). The
       most important results have been obtained for complex 2 with IC(50)
       values 8-16 mu M against HOS, K-562, and MCF-7 cell lines, and for
       complex 6 with IC50 value 4 mu M against MCF-7 cell line. (C) 2008
       Elsevier Ltd. All rights reserved.,
    DOI = 10.1016/j.bmc.2008.07.082,
    ISSN = 0968-0896,
    Unique-ID = ISI:000259173400046,
    
  • [DOI] J. Soukupova, L. Kvitek, A. Panacek, T. Nevecna, and R. Zboril, "Comprehensive study on surfactant role on silver nanoparticles (NPs)
    prepared via modified Tollens process," MATERIALS CHEMISTRY AND PHYSICS, vol. 111, iss. 1, pp. 77-81, 2008.
    [Bibtex]
    @article ISI:000257450300017,
    Author = Soukupova, Jana and Kvitek, Libor and Panacek, Ales and Nevecna,
       Tat'jana and Zboril, Radek,
    Title = Comprehensive study on surfactant role on silver nanoparticles (NPs)
       prepared via modified Tollens process,
    Journal = MATERIALS CHEMISTRY AND PHYSICS,
    Year = 2008,
    Volume = 111,
    Number = 1,
    Pages = 77-81,
    Month = SEP 15,
    Abstract = Surfactants represent not only commonly used wetting agents but also
       substances that can be used as growth modifiers in the process of solid
       nanoparticle (NP) preparation. In this study we report influential
       character of different types of surfactants - i.e. ionic (SDS, CTAC) and
       non-ionic (Tween 80) - on fundamental characteristics of silver NPs,
       which were prepared by a modified Tollens process. The influential
       character of surfactants was evaluated throughout a reasonable
       improvement of the polyclispersity (in the case of the tested non-ionic
       surfactants from 8.5\% even down to 2.5\%) and in the case of ionic
       surfactant, SDS and CTAC, also significant change of zeta potential
       (from -20 to -50 mV for the highest tested concentration of SDS). A
       slight influence of the tested surfactants was observed on the sizes of
       the prepared silver NPs. Therefore the obtained results from the
       performed surfactant-assisted syntheses revealed a possibility how to
       tailor silver NPs by means of their polydispersity and zeta potential
       according to the application demands. (c) 2008 Elsevier B.V. All rights
       reserved.,
    DOI = 10.1016/j.matchemphys.2008.03.018,
    ISSN = 0254-0584,
    Unique-ID = ISI:000257450300017,
    
  • [DOI] M. Hermanek and R. Zboril, "Polymorphous Exhibitions of Iron(III) Oxide during Isothermal Oxidative
    Decompositions of Iron Salts: A Key Role of the Powder Layer Thickness," CHEMISTRY OF MATERIALS, vol. 20, iss. 16, pp. 5284-5295, 2008.
    [Bibtex]
    @article ISI:000258580500027,
    Author = Hermanek, Martin and Zboril, Radek,
    Title = Polymorphous Exhibitions of Iron(III) Oxide during Isothermal Oxidative
       Decompositions of Iron Salts: A Key Role of the Powder Layer Thickness,
    Journal = CHEMISTRY OF MATERIALS,
    Year = 2008,
    Volume = 20,
    Number = 16,
    Pages = 5284-5295,
    Month = AUG 26,
    Abstract = Thermal decomposition of iron(II) oxalate dihydrate, FeC2O4 center dot
       2H(2)O, was studied under isothermal conditions in air by using of X-ray
       diffraction (XRD), transmission electron microscopy (TEM), magnetic
       measurements, and Mossbauer spectroscopy. Direct in situ monitoring of
       sample temperature was found to be a breaking point in understanding the
       decomposition mechanism resulting in different polymorphous product
       compositions which are simultaneously dependent on the powder layer
       thickness and reaction temperature. At a certain temperature, there
       exists a critical sample layer thickness (weight, m(c)), below which the
       optimal oxygen access into the whole powder volume is enabled and the
       reaction proceeds under truly isothermal conditions. In such a case
       hematite (alpha-Fe2O3) is the only crystalline decomposition product.
       Above m(c), at worsened diffusion conditions, a dramatic time-limited
       increase in the sample temperature has been observed. The appearance of
       such an ``exoeffect'' is a consequence of the violent diffusion of air
       oxygen inside the sample volume which depends precisely on the layer
       thickness and set temperature. During this exothermal stage of the
       reaction process the changes in kinetics and mechanism of decomposition
       are evidenced by an abrupt fall in the oxalate content and by the
       formation of the vacant structure of maghemite (gamma-Fe2O3). The
       generalization of these phenomena has been demonstrated by several
       examples of oxidative decompositions of other metal salts, where the
       analogous exoeffect has been detected and various polymorphous mixtures
       containing alpha-, beta-, gamma-, and/or amorphous Fe2O3 have been
       identified among the reaction products. Our findings explain
       unambiguously the literature discrepancies concerning the different
       phase compositions of samples prepared by the ``isothermal''
       solid-state decomposition processes. What is more, when the key reaction
       parameters are precisely controlled, single-phase nanocrystalline
       products possessing superior properties can be obtained.,
    DOI = 10.1021/cm8011827,
    ISSN = 0897-4756,
    Unique-ID = ISI:000258580500027,
    
  • [DOI] A. B. Bourlinos, V. Georgakilas, R. Zboril, D. Jancik, M. A. Karakassides, A. Stassinopoulos, D. Anglos, and E. P. Giannelis, "Reaction of graphite fluoride with NaOH-KOH eutectic," JOURNAL OF FLUORINE CHEMISTRY, vol. 129, iss. 8, pp. 720-724, 2008.
    [Bibtex]
    @article ISI:000259723000011,
    Author = Bourlinos, Athanasios B. and Georgakilas, Vasilios and Zboril, Radek and
       Jancik, Dalibor and Karakassides, Michael A. and Stassinopoulos, Andreas
       and Anglos, Demetrios and Giannelis, Emmanuel P.,
    Title = Reaction of graphite fluoride with NaOH-KOH eutectic,
    Journal = JOURNAL OF FLUORINE CHEMISTRY,
    Year = 2008,
    Volume = 129,
    Number = 8,
    Pages = 720-724,
    Month = AUG,
    Abstract = Graphite fluoride has been generally considered chemically inert against
       strong alkalis under ambient conditions. In the present study we
       demonstrate that treatment of graphite fluoride with eutectic NaOH-KOH
       mixture at 250 degrees C induces dramatic structural and textural
       changes in the solid as evidenced by XRD, FT-IR, Raman, UV-vis
       absorption and fluorescence and microscopy techniques (TEM, AFM). The
       reaction proceeds in the molten state leading to water-soluble,
       graphitized carbon particles which unlike graphite fluoride, adopt a
       variety of morphologies, like platy, tetragonal, triangular, discoid and
       spherical. The resulting carbon particles are dispersible in water and
       fluoresce under UV excitation. (c) 2008 Elsevier B.V. All rights
       reserved.,
    DOI = 10.1016/j.jfluchem.2008.05.020,
    ISSN = 0022-1139,
    Unique-ID = ISI:000259723000011,
    
  • [DOI] A. B. Bourlinos, A. Stassinopoulos, D. Anglos, R. Zboril, V. Georgakilas, and E. P. Giannelis, "Photoluminescent carbogenic dots," CHEMISTRY OF MATERIALS, vol. 20, iss. 14, pp. 4539-4541, 2008.
    [Bibtex]
    @article ISI:000257666300003,
    Author = Bourlinos, Athanasios B. and Stassinopoulos, Andreas and Anglos,
       Demetrios and Zboril, Radek and Georgakilas, Vasilios and Giannelis,
       Emmanuel P.,
    Title = Photoluminescent carbogenic dots,
    Journal = CHEMISTRY OF MATERIALS,
    Year = 2008,
    Volume = 20,
    Number = 14,
    Pages = 4539-4541,
    Month = JUL 22,
    DOI = 10.1021/cm800506r,
    ISSN = 0897-4756,
    Unique-ID = ISI:000257666300003,
    
  • [DOI] A. Bakandritsos, N. Bouropoulos, R. Zboril, K. Iliopoulos, N. Boukos, G. Chatzikyriakos, and S. Couris, "Optically active spherical polyelectrolyte brushes with a
    nanocrystalline magnetic core," ADVANCED FUNCTIONAL MATERIALS, vol. 18, iss. 11, pp. 1694-1706, 2008.
    [Bibtex]
    @article ISI:000257259400013,
    Author = Bakandritsos, Aristides and Bouropoulos, Nikos and Zboril, Radek and
       Iliopoulos, Kostas and Boukos, Nikos and Chatzikyriakos, George and
       Couris, Stelios,
    Title = Optically active spherical polyelectrolyte brushes with a
       nanocrystalline magnetic core,
    Journal = ADVANCED FUNCTIONAL MATERIALS,
    Year = 2008,
    Volume = 18,
    Number = 11,
    Pages = 1694-1706,
    Month = JUN 11,
    Abstract = The unique properties of magnetic nanocrystals have triggered intensive
       research towards their effective functionalization and application in
       many technological fields. Although synthesis of magnetic. colloids is
       being thoroughly studied, there is limited knowledge on the synthesis,
       characterization, and properties of magnetic polyelectrolyte spherical
       brushes. In the present work, the preparation of such hybrids and the
       subsequent formation of stable aqueous colloids are described. The core
       of the spherical brush consists of a magnetic gamma-Fe(2)O(3)
       nanocrystallite (faceted but mostly spherical-like) with a mean diameter
       of 17 nm. The bioadhesive polyelectrolyte poly(sodium 4-styrene
       sulfonate), forming the surrounding brush layer, was proven to be an
       effective covalently modifying macromolecule for the iron oxide surface,
       as Fourier transform IR spectroscopy revealed. Several observations on
       colloidal aspects are discussed and are successfully explained by models
       and experiments describing polyelectrolyte brushes with a soft polymeric
       core. Finally, the hybrids exhibit their multifunctional character and
       their technological importance by combining in a single and soluble
       product with magnetic and nonlinear optical properties.,
    DOI = 10.1002/adfm.200701335,
    ISSN = 1616-301X,
    Unique-ID = ISI:000257259400013,
    
  • [DOI] V. Belessi, R. Zboril, J. Tucek, M. Mashlan, V. Tzitzios, and D. Petridis, "Ferrofluids from magnetic-chitosan hybrids," CHEMISTRY OF MATERIALS, vol. 20, iss. 10, pp. 3298-3305, 2008.
    [Bibtex]
    @article ISI:000256056600011,
    Author = Belessi, V. and Zboril, R. and Tucek, J. and Mashlan, M. and Tzitzios,
       V. and Petridis, D.,
    Title = Ferrofluids from magnetic-chitosan hybrids,
    Journal = CHEMISTRY OF MATERIALS,
    Year = 2008,
    Volume = 20,
    Number = 10,
    Pages = 3298-3305,
    Month = MAY 27,
    Abstract = Magnetic nanoparticles coated with chitosan or quaternized chitosan were
       synthesized by a new route and characterized by X-ray diffraction (XRD),
       transmission electron microscopy (TEM), temperature dependent and
       in-field Mossbauer spectroscopy, FTIR, thermal analysis (TG/DTA), zeta
       potential, and magnetic measurements. The prepared ferrofluids were
       stable for a relatively long time. Mossbauer spectra recorded in an
       external magnetic field of 5 T establish the formation of
       ``nonstoichiometric magnetite'' exhibiting the perfect ferrimagnetic
       ordering with a low degree of spin canting and frustration. Magnetic
       measurements confirm the desired properties of the magnetic chitosan for
       biomedical applications including the superparamagnetic character at
       room temperature and a high saturation magnetization achievable at low
       applied fields. The successful and full capping of particles is
       indicated mainly from magnetic and DTA data through the suppressed
       interparticle interactions and a significant shift in the transformation
       temperature of the magnetic cores to hematite. The core-shell structure
       is definitely proved by TEM observations showing the well crystalline
       cubic particles with the log-normal size distribution between 10 and 40
       nm, which are fully coated with narrow shell of the chitosan matrix.,
    DOI = 10.1021/cm702990t,
    ISSN = 0897-4756,
    Unique-ID = ISI:000256056600011,
    
  • [DOI] V. Georoakilas, A. B. Bourlinos, R. Zboril, and C. Trapalis, "Synthesis, characterization and aspects of superhydrophobic
    functionalized carbon nanotubes," CHEMISTRY OF MATERIALS, vol. 20, iss. 9, pp. 2884-2886, 2008.
    [Bibtex]
    @article ISI:000255623400014,
    Author = Georoakilas, Vasilios and Bourlinos, Athanasios B. and Zboril, Radek and
       Trapalis, Christos,
    Title = Synthesis, characterization and aspects of superhydrophobic
       functionalized carbon nanotubes,
    Journal = CHEMISTRY OF MATERIALS,
    Year = 2008,
    Volume = 20,
    Number = 9,
    Pages = 2884-2886,
    Month = MAY 13,
    DOI = 10.1021/cm7034079,
    ISSN = 0897-4756,
    Unique-ID = ISI:000255623400014,
    
  • [DOI] L. Kvitek, A. Panacek, J. Soukupova, M. Kolar, R. Vecerova, R. Prucek, M. Holecova, and R. Zboril, "Effect of surfactants and polymers on stability and antibacterial
    activity of silver nanoparticles (NPs)," JOURNAL OF PHYSICAL CHEMISTRY C, vol. 112, iss. 15, pp. 5825-5834, 2008.
    [Bibtex]
    @article ISI:000254883100021,
    Author = Kvitek, Libor and Panacek, Ales and Soukupova, Jana and Kolar, Milan and
       Vecerova, Renata and Prucek, Robert and Holecova, Mirka and Zboril,
       Radek,
    Title = Effect of surfactants and polymers on stability and antibacterial
       activity of silver nanoparticles (NPs),
    Journal = JOURNAL OF PHYSICAL CHEMISTRY C,
    Year = 2008,
    Volume = 112,
    Number = 15,
    Pages = 5825-5834,
    Month = APR 17,
    Abstract = In this first systematic study, we describe the influence of various
       surfactants and polymers on aggregation stability and antibacterial
       activity of silver nanoparticles (NPs) prepared by a modified Tollens
       process. The surfactant/polymer stabilizing effect was monitored using
       the newly established method based on a titration of the aqueous
       dispersion of the silver NPs by aqueous solution of
       poly(diallyldimethylammonium) chloride (PDDA). The aggregation process
       was evaluated by the dynamic light scattering (DLS) and UV/vis spectra
       measurements and finally confirmed by TEM. Among all of the investigated
       modifiers, two surfactants (sodium dodecyl sulfate-SDS and
       polyoxyethylenesorbitane monooleate-Tween 80) and one polymer
       (polyvinylpyr-rolidone-PVP 360) exhibit superior stabilization of the
       silver NP dispersions against the process of aggregation. The
       differences in the stabilization ability of various tested substances
       are discussed with respect to their structure and possible mechanism of
       the surface interaction with the NPs. The antibacterial activity of the
       modified silver NPs was significantly enhanced especially when modified
       by SDS where the minimum inhibition concentration (MIC) decreased under
       the ``magical value'' of 1 mu g(.)mL(-1). A correlation was found
       between the aggregation stability and enhanced antibacterial activity in
       the system of the silver NPs modified by SDS, Tween 80, and high
       molecular polymer PVP 360.,
    DOI = 10.1021/jp711616v,
    ISSN = 1932-7447,
    Unique-ID = ISI:000254883100021,
    
  • [DOI] R. A. Yngard, V. K. Sharma, J. Filip, and R. Zboril, "Ferrate(VI) oxidation of weak-acid dissociable cyanides," ENVIRONMENTAL SCIENCE & TECHNOLOGY, vol. 42, iss. 8, pp. 3005-3010, 2008.
    [Bibtex]
    @article ISI:000254890400054,
    Author = Yngard, Ria A. and Sharma, Virender K. and Filip, Jan and Zboril, Radek,
    Title = Ferrate(VI) oxidation of weak-acid dissociable cyanides,
    Journal = ENVIRONMENTAL SCIENCE \& TECHNOLOGY,
    Year = 2008,
    Volume = 42,
    Number = 8,
    Pages = 3005-3010,
    Month = APR 15,
    Abstract = Cyanide is commonly found in electroplating, mining, coal gasification,
       and petroleum refining effluents, which require treatment before being
       discharged. Cyanide in effluents exists either as free cyanide or as a
       metal complex. The kinetics of the oxidation of weak-acid dissociable
       cyanides by an environmentally friendly oxidant, ferrate(VI)
       ((FeO42-)-O-VI , Fe(Vl)), were studied as a function of pH (9.1-10.5)
       and temperature (15-45 degrees C) using a stopped-flow technique. The
       weak-acid dissociable cyanides were Cd(CN)(4)(2-) and Ni(CN)(4)(2-), and
       the rate-laws for the oxidation maybe
       -d[Fe(Vl)]/dt=k[Fe(VI)][M(CN)(4)(2-)](n) where n = 0.5 and 1 for
       Cd(CN)(4)(2-) and Ni(CN)(4)(2-), respectively. The rates decreased with
       increasing pH and were mostly related to a decrease in concentration of
       the reactive protonated Fe(VI) species, HFeO4-. The stoichiometries with
       Fe(VI) were determined to be: 4HFeO(4-) + M(CN)(4)(2-) + 6H(2)O ->
       4Fe(OH)(3) + M2+ + 4NCO(-) + O-2 + 40H(-). Mechanisms are proposed that
       agree with the observed reaction rate-laws and stoichiometries of the
       oxidation of weak-acid dissociable cyanides by Fe(VI). Results indicate
       that Fe(VI) is effective in removing cyanide in coke oven plant
       effluent, where organics are also present.,
    DOI = 10.1021/es0720816,
    ISSN = 0013-936X,
    Unique-ID = ISI:000254890400054,
    
  • [DOI] A. B. Bourlinos, A. Stassinopoulos, D. Anglos, R. Zboril, M. Karakassides, and E. P. Giannelis, "Surface functionalized carbogenic quantum dots," SMALL, vol. 4, iss. 4, pp. 455-458, 2008.
    [Bibtex]
    @article ISI:000255620400013,
    Author = Bourlinos, Athanasios B. and Stassinopoulos, Andreas and Anglos,
       Demetrios and Zboril, Radek and Karakassides, Michael and Giannelis,
       Emmanuel P.,
    Title = Surface functionalized carbogenic quantum dots,
    Journal = SMALL,
    Year = 2008,
    Volume = 4,
    Number = 4,
    Pages = 455-458,
    Month = APR,
    DOI = 10.1002/smll.200700578,
    ISSN = 1613-6810,
    Unique-ID = ISI:000255620400013,
    
  • [DOI] R. Zboril, A. Bakandritsos, M. Mashlan, V. Tzitzios, P. Dallas, C. Trapalis, and D. Petridis, "One-step solid state synthesis of capped gamma-Fe(2)O(3)
    nanocrystallites," NANOTECHNOLOGY, vol. 19, iss. 9, 2008.
    [Bibtex]
    @article ISI:000254173900015,
    Author = Zboril, R. and Bakandritsos, A. and Mashlan, M. and Tzitzios, V. and
       Dallas, P. and Trapalis, Ch and Petridis, D.,
    Title = One-step solid state synthesis of capped gamma-Fe(2)O(3)
       nanocrystallites,
    Journal = NANOTECHNOLOGY,
    Year = 2008,
    Volume = 19,
    Number = 9,
    Month = MAR 5,
    Abstract = The thermally induced solid state synthesis of soluble organophilic
       maghemite (gamma-Fe(2)O(3)) nanocrystallites is described. The
       solvent-free one-step synthesis involves the reaction in the melt state
       of Fe(NO)(3)center dot 9H(2)O and RCOOH (R = C(11)H(23), C(15)H(31)) at
       240 degrees C. The method yields well-crystallized nanoparticles of
       gamma-Fe(2)O(3) functionalized with the corresponding aliphatic acid.
       Transmission electron microscopy (TEM) and atomic force microscopy (AFM)
       observations reveal composite particles with faceted magnetic cores and
       average size of 20 nm, which are well capped with the surrounding
       organic sheath. The Fourier transform infrared (FT-IR) spectra and
       thermal analysis suggest a bimodal configuration of the organic shell
       including chemically coordinated and physisorbed molecules of aliphatic
       acid. The chemical bonding of the carboxylate groups to the surface iron
       atoms is also indicated by a paramagnetic doublet with unchanged area in
       the variable temperature Mossbauer spectra. The spinel gamma-Fe(2)O(3)
       particles exhibit perfect structural and magnetic ordering, including
       the almost ideal ratio of octahedral to tetrahedral positions (5/3) and
       very low degree of spin canting, as confirmed by in-field Mossbauer
       spectroscopy. Magnetic measurements demonstrate the suitable properties
       required in various (bio) magnetic applications like superparamagnetic
       behavior at room temperature, high saturation magnetization achievable
       at low applied fields and suppressed magnetic interactions.,
    DOI = 10.1088/0957-4484/19/9/095602,
    Article-Number = 095602,
    ISSN = 0957-4484,
    Unique-ID = ISI:000254173900015,
    
  • [DOI] J. Pinkas, V. Reichlova, R. Zboril, Z. Moravec, P. Bezdicka, and J. Matejkova, "Sonochemical synthesis of amorphous nanoscopic iron(III) oxide from
    Fe(acac)(3)," ULTRASONICS SONOCHEMISTRY, vol. 15, iss. 3, pp. 257-264, 2008.
    [Bibtex]
    @article ISI:000252905500016,
    Author = Pinkas, Jiri and Reichlova, Vendula and Zboril, Radek and Moravec,
       Zdenek and Bezdicka, Petr and Matejkova, Jirina,
    Title = Sonochemical synthesis of amorphous nanoscopic iron(III) oxide from
       Fe(acac)(3),
    Journal = ULTRASONICS SONOCHEMISTRY,
    Year = 2008,
    Volume = 15,
    Number = 3,
    Pages = 257-264,
    Month = MAR,
    Abstract = Amorphous nanoscopic iron(III) oxide with interesting magnetic
       properties was prepared by sonolysis of Fe(acac)(3) under Ar in
       tetraglyme with a small amount of added water. The organics content and
       the surface area of the Fe2O3 nanoparticles can be controlled with an
       amount of water in the reaction mixture and it increases from 48 m(2)
       g(-1) for dry solvent up to 260 m(2) g(-1) when wet Ar is employed. For
       further monitoring of the particle size and morphology and for the study
       of the surface, magnetic and thermal properties, the sample with 2
       vol.\% of H2O was chosen. SEM showed nanoscopic composite particles of a
       uniform size distribution and nearly spherical shapes with an estimated
       diameter of 20 nm. Such composites are built from amorphous iron(III)
       oxide nanoparticles (3 nm) embedded in an acetate matrix as proved by
       TEM and IR spectroscopy. Temperature-dependent Mossbauer spectra
       demonstrate a very narrow magnetic transition with an unusually low
       transition temperature around 25 K reflecting the system of magnetically
       non-interacting ultrasmall particles with a narrow size distribution.
       The in-field (5 T) Mossbauer spectrum recorded at 5 K shows a minimum
       change compared to the zero-field spectrum indicating an absence of the
       long-range magnetic ordering. The composite particles are thermally
       stable up to 150 degrees C, which is confirmed by DSC, TG, and by the
       constant surface area. At higher temperatures, acetate groups are
       removed from the particle surface, which is documented by the increased
       surface area and disappearance of their IR bands. (c) 2007 Elsevier B.V.
       All rights reserved.,
    DOI = 10.1016/j.ultsonch.2007.03.009,
    ISSN = 1350-4177,
    Unique-ID = ISI:000252905500016,
    
  • L. Machala, R. Zboril, V. K. Sharma, and Z. Homonnay, "Decomposition of Potassium Ferrate(VI) (K(2)FeO(4)) and Potassium
    Ferrate(III) (KFeO(2)): In-situ Mossbauer Spectroscopy Approach," in MOSSBAUER SPECTROSCOPY IN MATERIALS SCIENCE 2008, 2008, pp. 114-121.
    [Bibtex]
    @inproceedings ISI:000262290200015,
    Author = Machala, Libor and Zboril, Radek and Sharma, Virender K. and Homonnay,
       Zoltan,
    Editor = Mashlan, M and Zboril, R,
    Title = Decomposition of Potassium Ferrate(VI) (K(2)FeO(4)) and Potassium
       Ferrate(III) (KFeO(2)): In-situ Mossbauer Spectroscopy Approach,
    Booktitle = MOSSBAUER SPECTROSCOPY IN MATERIALS SCIENCE 2008,
    Series = AIP Conference Proceedings,
    Year = 2008,
    Volume = 1070,
    Pages = 114-121,
    Note = International Conference on Mossbauer Spectroscopy in Materials Science,
       Hlohovec, CZECH REPUBLIC, JUN 16-20, 2008,
    Abstract = Mossbauer spectroscopy was shown to be very useful technique studying
       the mechanism of thermal decomposition or aging processes of the most
       known ferrate(VI), K(2)FeO(4). In-situ Mossbauer spectroscopy approach
       was used to monitor the phase composition during the studied processes.
       The experimental set-up was designed to perform in-situ measurements at
       high temperatures and at different air humid conditions at room
       temperature. The potassium ferrate(III), KFeO(2) was demonstrated to be
       the primary product of thermal decomposition of K(2)FeO(4). The KFeO(2)
       was unstable in a humid air at room temperature and reacted with
       components of air, H(2)O and CO(2) to give Fe(2)O(3) nanoparticles and
       KHCO(3). The aging kinetics of K(2)FeO(4) and KFeO(2) under humid air
       were significantly dependent on the relative air humidity.,
    ISSN = 0094-243X,
    ISBN = 978-0-7354-0601-8,
    Unique-ID = ISI:000262290200015,
    

2007

  • [DOI] H. Bartonkova, M. Mashlan, I. Medrik, D. Jancik, and R. Zboril, "Magnetically modified bentonite as a possible contrast agent in MRI of
    gastrointestinal tract," CHEMICAL PAPERS, vol. 61, iss. 5, pp. 413-416, 2007.
    [Bibtex]
    @article ISI:000248628000014,
    Author = Bartonkova, H. and Mashlan, M. and Medrik, I. and Jancik, D. and Zboril,
       R.,
    Title = Magnetically modified bentonite as a possible contrast agent in MRI of
       gastrointestinal tract,
    Journal = CHEMICAL PAPERS,
    Year = 2007,
    Volume = 61,
    Number = 5,
    Pages = 413-416,
    Month = OCT,
    Abstract = A composite of iron oxide nanoparticles and mineral matrix has been
       studied by XRD, Mossbauer spectroscopy, and TEM. Magnetite and
       superparamagnetic magnetite have been identified by Mossbauer
       spectroscopy in the nanocomposite. A relationship between the hyperfine
       parameters and iron oxide particle size has been confirmed by TEM. The
       optimal concentration of ``magnetite-bentonite'' composite, when the
       MRI signal is fully reduced, was found for using this composite as a
       negative contrast agent.,
    DOI = 10.2478/s11696-007-0057-9,
    ISSN = 0366-6352,
    Unique-ID = ISI:000248628000014,
    
  • [DOI] M. Hermanek, R. Zboril, N. Medrik, J. Pechousek, and C. Gregor, "Catalytic efficiency of iron(III) oxides in decomposition of hydrogen
    peroxide: Competition between the surface area and crystallinity of
    nanoparticles," JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 129, iss. 35, pp. 10929-10936, 2007.
    [Bibtex]
    @article ISI:000249208300060,
    Author = Hermanek, Martin and Zboril, Radek and Medrik, No and Pechousek, Jiri
       and Gregor, Cenek,
    Title = Catalytic efficiency of iron(III) oxides in decomposition of hydrogen
       peroxide: Competition between the surface area and crystallinity of
       nanoparticles,
    Journal = JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,
    Year = 2007,
    Volume = 129,
    Number = 35,
    Pages = 10929-10936,
    Month = SEP 5,
    Abstract = Various iron(III) oxide catalysts were prepared by controlled
       decomposition of a narrow layer (ca. 1 mm) of iron(II) oxalate
       dihydrate, FeC2O4 center dot 2H(2)O, in air at the minimum conversion
       temperature of 175 degrees C. This thermally induced solid-state process
       allows for simple synthesis of amorphous Fe2O3 nanoparticles and their
       controlled one-step crystallization to hematite (alpha-Fe2O3). Thus,
       nanopowders differing in surface area and particle crystallinity can be
       produced depending on the reaction time. The phase composition of
       iron(III) oxides was monitored by XRD and Fe-57 Mossbauer spectroscopy
       including in-field measurements, providing information on the relative
       contents of amorphous and crystalline phases. The gradual changes in
       particle size and surface area accompanying crystallization were
       evaluated by HRTEM and BET analysis, respectively. The catalytic
       efficiency of the synthesized nanoparticles was tested by tracking the
       decomposition of hydrogen peroxide. The obtained kinetic data gave an
       unconventional nonmonotone dependence of the rate constant on the
       surface area of the samples. The amorphous nanopowder with the largest
       surface area of 401 m(2) g(-1) revealed the lowest catalytic efficiency,
       while the highest efficiency was achieved with the sample having a
       significantly lower surface area, 337 m(2) g(-1), exhibiting a
       prevailing content of crystalline alpha-Fe2O3 phase. The obtained rate
       constant, 26.4 x 10(-3) min(-1) (g/L)(-1), is currently the highest
       value published. The observed rare catalytic phenomenon, where the
       particle crystallinity prevails over the surface area effects, is
       discussed with respect to other processes of heterogeneous catalysis.,
    DOI = 10.1021/ja072918x,
    ISSN = 0002-7863,
    Unique-ID = ISI:000249208300060,
    
  • [DOI] A. B. Bourlinos, V. Georgakilas, R. Zboril, and P. DallaS, "Preparation of a water-dispersible carbon nanotube-silica hybrid," CARBON, vol. 45, iss. 10, pp. 2136-2139, 2007.
    [Bibtex]
    @article ISI:000249540500031,
    Author = Bourlinos, A. B. and Georgakilas, V. and Zboril, R. and DallaS, P.,
    Title = Preparation of a water-dispersible carbon nanotube-silica hybrid,
    Journal = CARBON,
    Year = 2007,
    Volume = 45,
    Number = 10,
    Pages = 2136-2139,
    Month = SEP,
    DOI = 10.1016/j.carbon.2007.05.021,
    ISSN = 0008-6223,
    Unique-ID = ISI:000249540500031,
    
  • [DOI] Y. Jiraskova, M. Marysko, and R. Zboril, "Magnetic and structural features of amorphous FeMo-based alloys," JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, vol. 316, iss. 2, pp. E16-E19, 2007.
    [Bibtex]
    @article ISI:000248150000103,
    Author = Jiraskova, Yvonna and Marysko, Miroslav and Zboril, Radek,
    Title = Magnetic and structural features of amorphous FeMo-based alloys,
    Journal = JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,
    Year = 2007,
    Volume = 316,
    Number = 2,
    Pages = E16-E19,
    Month = SEP,
    Note = Joint European Magnetic Symposia (JEMS 06), San Sebastian, SPAIN, JUN
       26-29, 2006,
    Organization = Natl Advisory Comm,
    Abstract = NANOPERM-type FeMoCuB alloys are studied using magnetic and Mossbauer
       measurements in the as-prepared amorphous state. It is shown that the
       Fe76Mo8Cu1B15 (A) and Fe74Mo8Cu1B17 (B) alloys exhibit the magnetic
       dipole and electrical quadrupole interactions well detected in the
       room-temperature Mossbauer spectra. The thermomagnetic measurements
       above the room temperature indicate a vanishing of the magnetic
       interactions at approximately 310 K (A) and at 340 K (B), respectively.
       The low-temperature DC magnetic measurements show an anomaly around 200
       K which is also a boundary at which zero-field Mossbauer measurements of
       both samples reflect the gradual ``vanishing'' of the electrical
       quadrupole interactions and appearance of another magnetically ordered
       component. The Mossbauer measurements in the field of 4 MA/m yield a
       survival of quadrupole and an enhancement of magnetic dipole
       interactions. (c) 2007 Elsevier B.V. All rights reserved.,
    DOI = 10.1016/j.jmmm.2007.02.012,
    ISSN = 0304-8853,
    Unique-ID = ISI:000248150000103,
    
  • [DOI] J. Hrbac, V. Halouzka, R. Zboril, K. Papadopoulos, and T. Triantis, "Carbon electrodes modified by nanoscopic iron(III) oxides to assemble
    chemical sensors for the hydrogen peroxide amperometric detection," ELECTROANALYSIS, vol. 19, iss. 17, pp. 1850-1854, 2007.
    [Bibtex]
    @article ISI:000249294800015,
    Author = Hrbac, Jan and Halouzka, Vladimir and Zboril, Radek and Papadopoulos,
       Kyriakos and Triantis, Theodor,
    Title = Carbon electrodes modified by nanoscopic iron(III) oxides to assemble
       chemical sensors for the hydrogen peroxide amperometric detection,
    Journal = ELECTROANALYSIS,
    Year = 2007,
    Volume = 19,
    Number = 17,
    Pages = 1850-1854,
    Month = SEP,
    Abstract = In this study we show that nanoparticles of various ferric oxides
       (hematite, maghemitc, amorphous Fe2O3, beta-Fe2O3 and ferrihydrite)
       incorporated into carbon paste exhibit electro-catalytic properties
       towards hydrogen peroxide reduction. The modified paste electrode
       performances were evaluated and compared with those obtained with
       Prussian Blue-modified carbon paste electrode, which represents an
       excellent chemical mediator towards the H2O redox reaction (as widely
       described in literature). The best catalytic activity was found for
       carbon paste modified by amorphous ferric oxide with 2 - 4 nm particle
       size, which was further tested for possible application as hydrogen
       peroxide sensor. At pH 7, the limit of detection was 2 x 10(-5) M H2O2
       (S/N = 3), the calibration curves were linear upto 8.5 mM H2O2 (R-2=
       0.998), the measurement reproducibility (RSD = 97\%, n = 4), the
       interelectrode reproducibility (RSD = 16\%, n(electrodes) = 5) and < 3 s
       response time.,
    DOI = 10.1002/elan.200703938,
    ISSN = 1040-0397,
    Unique-ID = ISI:000249294800015,
    
  • [DOI] K. Nomura, R. Zboril, J. Tucek, W. Kosaka, S. Ohkoshi, and I. Felner, "Substitution effects of barium and calcium on magnetic properties of
    A(x)Sr(1-x)(Fe(0.5)Ru(0.5))O(3) double perovskites (x=0.05, A=Ba,Ca)," JOURNAL OF APPLIED PHYSICS, vol. 102, iss. 1, 2007.
    [Bibtex]
    @article ISI:000248018300065,
    Author = Nomura, K. and Zboril, R. and Tucek, J. and Kosaka, W. and Ohkoshi, S.
       and Felner, I.,
    Title = Substitution effects of barium and calcium on magnetic properties of
       A(x)Sr(1-x)(Fe(0.5)Ru(0.5))O(3) double perovskites (x=0.05, A=Ba,Ca),
    Journal = JOURNAL OF APPLIED PHYSICS,
    Year = 2007,
    Volume = 102,
    Number = 1,
    Month = JUL 1,
    Abstract = A(x)Sr(1-x)(Fe(0.5)Ru(0.5))O(3) double perovskites (x=0.05 and A=Ba,Ca)
       were prepared by a sol-gel method and an effect of the cation
       substitution at the A site of the crystal structure of
       SrFe(0.5)Ru(0.5)O(3) on their magnetic properties was monitored by x-ray
       diffraction (XRD), magnetic measurements, transmission electron
       microscopy (TEM), scanning electron microscopy (SEM), and
       temperature-dependent and in-field (57)Fe Mossbauer spectroscopy. Both
       Ca- and Ba-substituted samples reveal the orthorhombic structure similar
       to the undoped perovskite; however, the cell volume changes with the
       substituting ion radius. TEM and SEM micrographs manifest agglomerated
       nanocrystalline samples with particle sizes of about 20-60, 15-50, and
       40-70 nm for the undoped, Ba-doped, and Ca-doped perovskites,
       respectively. Generally, the magnetic regime of both substituted and
       undoped perovskites can be described by a spin-glass behavior caused by
       a spin frustration. Among other factors, this is manifested by a
       nonsaturation of the hysteresis loops even at a high field of 50 kOe, by
       a low-temperature divergence of the zero-field-cooled and field-cooled
       magnetization curves, and by a cusp in the zero-field-cooled
       magnetization curve. The low-temperature spin-glass state is also
       supported by the in-field Mossbauer spectra, recorded on these systems.
       The isomer shift parameters, extracted from the Mossbauer spectra,
       confirm a high-spin iron(III) state with S=5/2. In contrast to the
       undoped and Ba-doped samples, the narrower distribution of the hyperfine
       magnetic fields, observed in the Ca-doped perovskite can be ascribed to
       the larger particles. Compared to the undoped sample, the field of
       maximum probability is higher in the Ca-substituted perovskite while it
       is reduced in the Ba-doped sample because of the effects of the chemical
       compression and expansion, respectively. In addition, the Ca-doped
       sample exhibits more negative Weiss temperature (Theta=-105 K) than that
       found for the Ba-substituted perovskite (Theta=-49 K), implying that
       doping with Ca at Sr sites of SrFe(0.5)Ru(0.5)O(3) perovskite structure
       provokes strengthening of antiferromagnetic interactions at the expense
       of the other ones. Furthermore, both substituted samples reveal
       significantly reduced coercive fields in the hysteresis loops recorded
       at 5 K, probably as a result of decreasing magnetocrystalline
       anisotropy. This is an indirect evidence of the essential influence of
       the substitution on the crystal growth of the synthesized particles. The
       role of SrRuO(3) and SrFeO(3) compounds, which have been detected in
       magnetic and Mossbauer measurements as admixtures, is discussed. (c)
       2007 American Institute of Physics.,
    DOI = 10.1063/1.2751101,
    Article-Number = 013907,
    ISSN = 0021-8979,
    Unique-ID = ISI:000248018300065,
    
  • [DOI] J. Filip, R. Zboril, O. Schneeweiss, J. Zeman, M. Cernik, P. Kvapil, and M. Otyepka, "Environmental applications of chemically pure natural ferrihydrite," ENVIRONMENTAL SCIENCE & TECHNOLOGY, vol. 41, iss. 12, pp. 4367-4374, 2007.
    [Bibtex]
    @article ISI:000247187600026,
    Author = Filip, Jan and Zboril, Radek and Schneeweiss, Oldrich and Zeman, Josef
       and Cernik, Miroslav and Kvapil, Petr and Otyepka, Michal,
    Title = Environmental applications of chemically pure natural ferrihydrite,
    Journal = ENVIRONMENTAL SCIENCE \& TECHNOLOGY,
    Year = 2007,
    Volume = 41,
    Number = 12,
    Pages = 4367-4374,
    Month = JUN 15,
    Abstract = Fresh precipitates, deposited from seepage waters of complex-ore
       mine-tailing impoundment at Zlate Hory, Czech Republic, were
       characterized by means of X-ray diffraction, transmission electron
       microscopy, low temperature and in-field Mossbauer spectroscopy, and
       Brunauer-Emmett-Teller surface area measurements. The prevailing phases
       (similar to 96 wt \%) found in precipitates are poorly crystalline, 2-6
       nm sized two-line ferrihydrite, forming globular aggregates of about 150
       nm in diameter, rimmed by acicular irregular nanocrystals of goethite.
       These nanocrystalline ferrihydrite-goethite precipitates are of a
       relatively high chemical purity (similar to 3\% SiO2, Zn similar to 1300
       ppm, trace and rare earth elements < 100 ppm) and thus applicable in
       various nanotechnologies. With a surface area of 270 m(2) g(-1),
       precipitate possesses a high catalytic activity in the decomposition of
       hydrogen peroxide, which is comparable with that found for commercially
       accessible FeO(OH) catalyst. Another superior aspect of such natural
       nanoparticles presents a cheap and suitable precursor for a thermally
       induced solid-state synthesis of the stable core-shell alpha-Fe-FeO
       nanoparticles that are well applicable in reductive technologies of
       groundwater treatment. Just the possibility of using the undesirable
       waste contaminating the environment in further environmental
       technologies is the key practical benefit discussed in this paper.,
    DOI = 10.1021/es062312t,
    ISSN = 0013-936X,
    Unique-ID = ISI:000247187600026,
    
  • [DOI] L. Machala, R. Zboril, and A. Gedanken, "Amorphous iron(III) Oxide - A review," JOURNAL OF PHYSICAL CHEMISTRY B, vol. 111, iss. 16, pp. 4003-4018, 2007.
    [Bibtex]
    @article ISI:000245797700002,
    Author = Machala, Libor and Zboril, Radek and Gedanken, Aharon,
    Title = Amorphous iron(III) Oxide - A review,
    Journal = JOURNAL OF PHYSICAL CHEMISTRY B,
    Year = 2007,
    Volume = 111,
    Number = 16,
    Pages = 4003-4018,
    Month = APR 26,
    Abstract = The syntheses of amorphous Fe2O3 nanoparticles of varying size and
       morphology, their magnetic properties, crystallization mechanism, and
       applications are reviewed herein. The synthetic routes are classified
       according to the nature of the sample (powders, nanocomposites, films,
       coated particles). The contributions of various experimental techniques
       to the characterization of an amorphous Fe2O3 phase are considered in
       this review, including some key experimental markers, allowing its
       distinction from nanocrystalline ``X-ray amorphous'' polymorphs
       (maghemite, hematite). We discuss the thermally induced crystallization
       mechanisms depending on transformation temperature, atmosphere, and the
       size of the amorphous particles that predetermine the structure of the
       primarily formed crystalline polymorph. The controversial description of
       the magnetic behavior, including an interpretation of the
       low-temperature and in-field Mossbauer spectra, is analyzed.,
    DOI = 10.1021/jp064992s,
    ISSN = 1520-6106,
    Unique-ID = ISI:000245797700002,
    
  • [DOI] L. Machala, R. Zboril, V. K. Sharma, J. Filip, O. Schneeweiss, and Z. Homonnay, "Mossbauer characterization and in situ monitoring of thermal
    decomposition of potassium ferrate(VI), K(2)FeO(4) in static air
    conditions," JOURNAL OF PHYSICAL CHEMISTRY B, vol. 111, iss. 16, pp. 4280-4286, 2007.
    [Bibtex]
    @article ISI:000245797700035,
    Author = Machala, Libor and Zboril, Radek and Sharma, Virender K. and Filip, Jan
       and Schneeweiss, Oldrich and Homonnay, Zoltan,
    Title = Mossbauer characterization and in situ monitoring of thermal
       decomposition of potassium ferrate(VI), K(2)FeO(4) in static air
       conditions,
    Journal = JOURNAL OF PHYSICAL CHEMISTRY B,
    Year = 2007,
    Volume = 111,
    Number = 16,
    Pages = 4280-4286,
    Month = APR 26,
    Abstract = Solid orthorhombic crystals of potassium ferrate(VI) (K(2)FeO(4)) of a
       high-chemical purity (> 99.0\%) were characterized by low-temperature
       (1.5-5 K), high-temperature (463-863 K), and in-field (1.5 K/3 T)
       Mossbauer spectroscopy. Potassium ferrate(VI) reveals a Neel magnetic
       transition temperature (T(N)) of similar to 3.8 K and a saturation
       hyperfine magnetic field of 13.8 T at 1.5 K. Spectral line intensities
       recorded below T(N) in an external magnetic field of 3 T manifest a
       perfect antiferromagnetic ordering. For the in situ monitoring of the
       thermal behavior of K(2)FeO(4), high-temperature Mossbauer data were
       combined with those obtained from thermogravimetry, differential
       scanning calorimetry, and variable-temperature X-ray diffraction
       measurements. Such in situ approach allowed the identification of the
       reaction products and intermediates and yielded the first experimental
       evidence for the participation of CO(2) in the decomposition process. As
       the primary conversion products, KFeO(2) and two potassium oxides in
       equivalent molar ratio, KO(2) and K(2)O, were suggested. However, the
       KO(2) phase is detectable with difficulty as it reacts very quickly with
       CO(2) from air resulting in the formation of K(2)CO(3). The presented
       decomposition model is consistent with thermogravimetric data giving the
       mass loss of 8.0\%, which corresponds to the participation of (1)/(6)
       mol of CO(2) and liberation of (3)/(4) mol of O(2) per 1 mol of
       K(2)FeO(4) (K(2)FeO(4) + (1)/(6)CO(2) -> KFeO(2) + (1)/(3)K(2)O +
       (1)/(6)K(2)CO(3) + (3)/(4)O(2)). An explanation of the multistage
       reaction mechanism has an important practical impact for the
       optimization of the solid-state synthesis of potassium ferrate(VI).,
    DOI = 10.1021/jp068272x,
    ISSN = 1520-6106,
    Unique-ID = ISI:000245797700035,
    
  • [DOI] A. B. Bourlinos, A. Bakandritsos, R. Zboril, M. Karakassides, and C. Trapalis, "Preparation of a water-dispersible carbon-silica composite derived from
    a silylated molecular precursor," CARBON, vol. 45, iss. 5, pp. 1108-1111, 2007.
    [Bibtex]
    @article ISI:000246609200029,
    Author = Bourlinos, A. B. and Bakandritsos, A. and Zboril, R. and Karakassides,
       M. and Trapalis, C.,
    Title = Preparation of a water-dispersible carbon-silica composite derived from
       a silylated molecular precursor,
    Journal = CARBON,
    Year = 2007,
    Volume = 45,
    Number = 5,
    Pages = 1108-1111,
    Month = APR,
    DOI = 10.1016/j.carbon.2007.02.018,
    ISSN = 0008-6223,
    Unique-ID = ISI:000246609200029,
    
  • [DOI] O. Schneeweiss, B. David, T. Zak, R. Zboril, and M. Mashlan, "Nanocrystalline Fe-Ni and Fe-Co samples prepared by powder processing," JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, vol. 310, iss. 2, Part 3, pp. E858-E860, 2007.
    [Bibtex]
    @article ISI:000247720400418,
    Author = Schneeweiss, O. and David, B. and Zak, T. and Zboril, R. and Mashlan, M.,
    Title = Nanocrystalline Fe-Ni and Fe-Co samples prepared by powder processing,
    Journal = JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,
    Year = 2007,
    Volume = 310,
    Number = 2, Part 3,
    Pages = E858-E860,
    Month = MAR,
    Abstract = Preparation and properties of nanocrystalline samples of Ni3Fe and FeCo
       alloys by calcination of mixtures of Fe, Co, and Ni oxalates are
       described. The samples contain according to XRD single Ni3Fe and FeCo
       phases with grain size about 40 and 45 nm, respectively. The parameters
       derived from the Mossbauer spectra confirm the single phase samples. The
       saturation induction values are close to the coarse polycrystals but
       coercive force is importantly higher and permeability lower. The
       magnetic behaviour is explained by the role of interfacial regions in
       the samples. (C) 2006 Elsevier B. V. All rights reserved.,
    DOI = 10.1016/j.mmm.2006.11.018,
    ISSN = 0304-8853,
    Unique-ID = ISI:000247720400418,
    

2006

  • [DOI] M. Mal'arova, Z. Travnicek, R. Zboril, and J. Cernak, "[Co(en)(3)][Fe(CN)(6)] center dot H2O and
    [Co(en)(3)][Fe(CN)(6)]: A dehydration process investigated by single
    crystal X-ray analysis, thermal analysis and Mossbauer spectroscopy," POLYHEDRON, vol. 25, iss. 15, pp. 2935-2943, 2006.
    [Bibtex]
    @article ISI:000241475100016,
    Author = Mal'arova, Miroslava and Travnicek, Zdenek and Zboril, Radek and Cernak,
       Juraj,
    Title = [Co(en)(3)][Fe(CN)(6)] center dot H2O and
       [Co(en)(3)][Fe(CN)(6)]: A dehydration process investigated by single
       crystal X-ray analysis, thermal analysis and Mossbauer spectroscopy,
    Journal = POLYHEDRON,
    Year = 2006,
    Volume = 25,
    Number = 15,
    Pages = 2935-2943,
    Month = NOV 3,
    Abstract = The complexes [Co(en)(3)][Fe(CN)(6)] center dot H2O (1) and
       [Co(en)(3)][Fe(CN)(6)] (2) (en = 1,2-diaminoethane) have been
       prepared and characterized by elemental analysis, single crystal X-ray
       analysis, TG/DSC analyses and Fe-57 Mossbauer spectroscopy. Single
       crystals of 1 have been prepared by recrystallization of compound 1 from
       a water solution, while crystals of complex 2 have been synthesized in
       the solid state by dynamic heating of 1 up to 150 degrees C. Both
       complexes exhibit ionic structures built up of [Co(en)(3)](3+) cations
       and [Fe(CN)(6)](3-) anions. The presence and/or absence of the crystal
       water molecule in the complexes has a strong influence on their thermal
       stability, the extent of hydrogen bonding in the crystal structures and
       on the symmetry of the iron(III) environments in the [Fe(CN)(6)](3-)
       anions, as determined by Fe-57 Mossbauer spectroscopy. (C) 2006 Elsevier
       Ltd. All rights reserved.,
    DOI = 10.1016/j.poly.2006.04.021,
    ISSN = 0277-5387,
    Unique-ID = ISI:000241475100016,
    
  • [DOI] K. Barcova, M. Mashlan, R. Zboril, J. Filip, J. Podjuklova, K. Hrabovska, and P. Schaaf, "Phase composition of steel-enamel interfaces: Effects of chemical
    pre-treatment," SURFACE & COATINGS TECHNOLOGY, vol. 201, iss. 3-4, pp. 1836-1844, 2006.
    [Bibtex]
    @article ISI:000244477300181,
    Author = Barcova, K. and Mashlan, M. and Zboril, R. and Filip, J. and Podjuklova,
       J. and Hrabovska, K. and Schaaf, P.,
    Title = Phase composition of steel-enamel interfaces: Effects of chemical
       pre-treatment,
    Journal = SURFACE \& COATINGS TECHNOLOGY,
    Year = 2006,
    Volume = 201,
    Number = 3-4,
    Pages = 1836-1844,
    Month = OCT 5,
    Abstract = Mossbauer spectroscopy in transmission geometry, performed
       simultaneously with conversion X-ray, and conversion electron Mossbauer
       spectroscopy, X-ray powder diffraction and electron microprobe analysis
       (EMPA), have been used to monitor the effects of a chemical pretreatment
       on the phase composition of a ``steel-enamel interface'' of a
       hot-rolled steel surface formed during a thermally induced coating
       process. In this comparative study, we have analysed both an untreated
       sample and a treated sample of a steel sheet with the surface pickled by
       dilute H2SO4 and passivated in Na2CO3 solution. A continuous magnetite
       layer covering the steel surface as a result of the chemical
       pre-treatment was identified by backscattering Mossbauer spectroscopy
       and EMPA. During a fusion process, well crystalline fayalite (Fe2SiO4)
       is formed at the phase boundary by the solid-state reaction of magnetite
       with the SiO2-based enamel matrix. Wustite (FeO) was detected as a
       product of oxidation of iron under the magnetite layer of the chemically
       pre-treated sample, whereas hematite represents a product of oxidation
       of magnetite. This wustite-magnetite-(hematite)-fayalite layered
       interface is rimmed by isometric metallic intricate network-forming
       particles with a composition of about Fe0.95Ni0.05 and which are related
       to a diffusion-reduction process of iron and/or to a reduction of Fe3+
       in glass. In the case of chemically untreated steel, EMPA revealed a
       sharp phase boundary, rimmed again by Fe-based metallic particles.
       Magnetite covered by fayalite was occasionally observed in a few areas
       of the phase boundary. The presence of magnetite at the interface of the
       chemically untreated sample is due to a thermally induced air-oxidation
       of the alpha-Fe steel surface during an enamelling procedure. The
       surprising effect of the chemical pre-treatment, resulting in a lowering
       of adhesion of enamel on the steel surface, is discussed. (c) 2006
       Elsevier B.V. All rights reserved.,
    DOI = 10.1016/j.surfcoat.2006.03.015,
    ISSN = 0257-8972,
    Unique-ID = ISI:000244477300181,
    
  • L. Machala, R. Zboril, V. K. Sharma, J. Filip, and O. Schneeweiss, "New view on thermal behavior of K(2)FeO(4) in static air," ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, vol. 232, pp. 42-ENVR, 2006.
    [Bibtex]
    @article ISI:000207781604643,
    Author = Machala, Libor and Zboril, Radek and Sharma, Virender K. and Filip, Jan
       and Schneeweiss, Oldrich,
    Title = New view on thermal behavior of K(2)FeO(4) in static air,
    Journal = ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY,
    Year = 2006,
    Volume = 232,
    Pages = 42-ENVR,
    Month = SEP 10,
    ISSN = 0065-7727,
    Unique-ID = ISI:000207781604643,
    
  • [DOI] B. David, R. Zboril, M. Mashlan, T. Grygar, F. Dumitrache, and O. Schneeweiss, "Single ferromagnetic behaviour of nanopowders with Fe(3)C," JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, vol. 304, iss. 2, pp. E787-E789, 2006.
    [Bibtex]
    @article ISI:000207211800099,
    Author = David, B. and Zboril, R. and Mashlan, M. and Grygar, T. and Dumitrache,
       F. and Schneeweiss, O.,
    Title = Single ferromagnetic behaviour of nanopowders with Fe(3)C,
    Journal = JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,
    Year = 2006,
    Volume = 304,
    Number = 2,
    Pages = E787-E789,
    Month = SEP,
    Abstract = The magnetic properties of Fe(3)C nanopowders prepared by laser
       pyrolysis (Sample A) and reduction and carburization of a
       nanocrystalline iron oxide (Sample B) are investigated. Fe(3)C was
       recognized as the solely ferromagnetic phase with the crystallite mean
       size 20 and 12 nm for the Sample A and B, respectively. The nanopowders
       exhibit ferromagnetic behavior with a blurred transition to paramagnetic
       state nearby the Curie temperature of coarse grained Fe(3)C. This effect
       is explained by a grain size distribution and the influence of the
       surface/interface regions of the nanoparticles. (C) 2006 Elsevier B. V.
       All rights reserved.,
    DOI = 10.1016/j.jmmm.2006.02.224,
    ISSN = 0304-8853,
    Unique-ID = ISI:000207211800099,
    
  • [DOI] A. Panacek, L. Kvitek, R. Prucek, M. Kolar, R. Vecerova, N. Pizurova, V. K. Sharma, T. Nevecna, and R. Zboril, "Silver colloid nanoparticles: Synthesis, characterization, and their
    antibacterial activity," JOURNAL OF PHYSICAL CHEMISTRY B, vol. 110, iss. 33, pp. 16248-16253, 2006.
    [Bibtex]
    @article ISI:000239818000019,
    Author = Panacek, Ales and Kvitek, Libor and Prucek, Robert and Kolar, Milan and
       Vecerova, Renata and Pizurova, Nadezda and Sharma, Virender K. and
       Nevecna, Tat'jana and Zboril, Radek,
    Title = Silver colloid nanoparticles: Synthesis, characterization, and their
       antibacterial activity,
    Journal = JOURNAL OF PHYSICAL CHEMISTRY B,
    Year = 2006,
    Volume = 110,
    Number = 33,
    Pages = 16248-16253,
    Month = AUG 24,
    Abstract = A one-step simple synthesis of silver colloid nanoparticles with
       controllable sizes is presented. In this synthesis, reduction of
       [Ag(NH3)(2)](+) complex cation by four saccharides was performed. Four
       saccharides were used: two monosaccharides (glucose and galactose) and
       two disaccharides (maltose and lactose). The syntheses performed at
       various ammonia concentrations (0.005-0.20 mol L-1) and pH conditions
       (11.5-13.0) produced a wide range of particle sizes (25-450 nm) with
       narrow size distributions, especially at the lowest ammonia
       concentrations. The average size, size distribution, morphology, and
       structure of particles were determined by dynamic light scattering
       (DLS), transmission electron microscopy (TEM), and UV/Visible absorption
       spectrophotometry. The influence of the saccharide structure
       (monosacharides versus disaccharides) on the size of silver particles is
       briefly discussed. The reduction of [Ag(NH3)(2)](+) by maltose
       produced silver particles with a narrow size distribution with an
       average size of 25 nm, which showed high antimicrobial and bactericidal
       activity against Gram-positive and Gram-negative bacteria, including
       highly multiresistant strains such as methicillin-resistant
       Staphylococcus aureus. Antibacterial activity of silver nanoparticles
       was found to be dependent on the size of silver particles. A very low
       concentration of silver (as low as 1.69 mu g/mL Ag) gave antibacterial
       performance.,
    DOI = 10.1021/jp063826h,
    ISSN = 1520-6106,
    Unique-ID = ISI:000239818000019,
    
  • [DOI] J. Madarasz, R. Zboril, Z. Homonnay, V. K. Sharma, and G. Pokol, "Thermal decomposition of iron(VI) oxides, K(2)FeO(4) and BaFeO(4), in an
    inert atmosphere," JOURNAL OF SOLID STATE CHEMISTRY, vol. 179, iss. 5, pp. 1426-1433, 2006.
    [Bibtex]
    @article ISI:000237528900022,
    Author = Madarasz, Janos and Zboril, Radek and Homonnay, Zoltan and Sharma,
       Virender K. and Pokol, Gyorgy,
    Title = Thermal decomposition of iron(VI) oxides, K(2)FeO(4) and BaFeO(4), in an
       inert atmosphere,
    Journal = JOURNAL OF SOLID STATE CHEMISTRY,
    Year = 2006,
    Volume = 179,
    Number = 5,
    Pages = 1426-1433,
    Month = MAY,
    Abstract = The thermal decomposition of solid samples of iron(VI) oxides,
       K(2)FeO(4) center dot 0.088 H(2)O (1) and BaFeO(4) center dot 0.25H(2)O
       (2) in inert atmosphere has been examined using simultaneous
       thermogravimetry and differential thermal analysis (TG/DTA), in
       combination with ill situ analysis of the evolved gases by Online
       Coupled mass spectrometer (EGA-MS). The final decomposition products
       were characterized by (57)Fe Mossbauer spectroscopy. Water molecules
       were released first, followed by a distinct decomposition step with
       endothermic DTA peak of 1 and 2 at 273 and 248 degrees C. respectively,
       corresponding to the evolution of molecular oxygen as confirmed by
       EGA-MS. The released amounts of O(2) were determined as 0.42 and 0.52
       mol pro formula of 1 and 2, respectively. The decomposition product of
       K(2)FeO(4) at 250 degrees C was determined as Fe(III) species in the
       form of KFeO(2). Formation of an amorphous mixture of superoxide,
       peroxide, and oxide of potassium may be other products of the thermal
       conversion of iron(VI) oxide I to account for less than expected
       released oxygen. The thermogravimetric and Mossbauer data suggest that
       barium iron perovskite with the intermediate valence state of iron
       (between III and IV) was the product of thermal decomposition of
       iron(VI) oxide 2. (C) 2006 Elsevier Inc. All rights reserved.,
    DOI = 10.1016/j.jssc.2006.01.054,
    ISSN = 0022-4596,
    Unique-ID = ISI:000237528900022,
    
  • [DOI] J. Tucek, R. Zboril, and D. Petridis, "Maghemite nanoparticles by view of Mossbauer spectroscopy," JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, vol. 6, iss. 4, pp. 926-947, 2006.
    [Bibtex]
    @article ISI:000237069200004,
    Author = Tucek, J and Zboril, R and Petridis, D,
    Title = Maghemite nanoparticles by view of Mossbauer spectroscopy,
    Journal = JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY,
    Year = 2006,
    Volume = 6,
    Number = 4,
    Pages = 926-947,
    Month = APR,
    Abstract = A (57)Fe Mossbauer spectrometry applied in a broad range of temperatures
       and external magnetic fields is presented as a powerful investigating
       tool for the structural and magnetic characterization of maghemite
       (gamma-Fe(2)O(3)) nanoparticles, which presently constitute a modern
       advanced material used in various fields of scientific, technological,
       and biomedical interest. Reflections of structural and magnetic
       properties in the hyperfine parameters of Mossbauer spectra of
       nanomaghemite samples prepared by different routes with varying particle
       size distribution, particle morphology, and degree of interparticle
       interactions (isolated nanoparticles, powders, nanocomposites, films)
       are reviewed. Some crucial points concerning the description of the
       magnetic regime of strongly interacting maghemite nanoparticles are also
       briefly discussed with respect to their Mossbauer spectra.,
    DOI = 10.1166/jnn.2006.183,
    ISSN = 1533-4880,
    Unique-ID = ISI:000237069200004,
    
  • [DOI] K. Barcova, R. Zboril, M. Mashlan, Y. Jiraskova, J. Filip, J. Lunacek, and K. Hrabovska, "Influence of enamel ageing on mechanical properties and phase
    composition of the steel-enamel system," SURFACE AND INTERFACE ANALYSIS, vol. 38, iss. 4, pp. 413-416, 2006.
    [Bibtex]
    @article ISI:000237437100059,
    Author = Barcova, K and Zboril, R and Mashlan, M and Jiraskova, Y and Filip, J
       and Lunacek, J and Hrabovska, K,
    Title = Influence of enamel ageing on mechanical properties and phase
       composition of the steel-enamel system,
    Journal = SURFACE AND INTERFACE ANALYSIS,
    Year = 2006,
    Volume = 38,
    Number = 4,
    Pages = 413-416,
    Month = APR,
    Note = 11th European Conference on Applications of Surface and Interface
       Analysis, Vienna, AUSTRIA, SEP 25-30, 2005,
    Abstract = An effect of the enamel ageing on the mechanical properties and
       composition of the steel-enamel system was monitored by means of
       conversion electron and transmission Mossbauer spectroscopy,
       electron-microprobe analysis, thermogravimetry and microhardness
       measurement. Two enamels differing in the time delay between their
       preparation and application on the steel surface (1 day vs 30 days) were
       used for this comparative study. After the enamelling procedure, the
       qualitative phase composition of both samples is similar, including
       alpha-Fe, FeO, Fe(3)O(4), alpha-Fe(2)O(3), Fe(2)SiO(4) and the Fe-Ni
       particles. Despite this similar qualitative phase composition of
       differently aged enamels, the mechanical properties of the samples are
       significantly different. Copyright (C) 2006 John Wiley \& Sons, Ltd.,
    DOI = 10.1002/sia.2288,
    ISSN = 0142-2421,
    Unique-ID = ISI:000237437100059,
    
  • [DOI] O. Schneeweiss, R. Zboril, N. Pizurova, M. Mashlan, E. Petrovsky, and J. Tucek, "Novel solid-state synthesis of alpha-Fe and Fe(3)O(4) nanoparticles
    embedded in a MgO matrix," NANOTECHNOLOGY, vol. 17, iss. 2, pp. 607-616, 2006.
    [Bibtex]
    @article ISI:000235221800045,
    Author = Schneeweiss, O and Zboril, R and Pizurova, N and Mashlan, M and
       Petrovsky, E and Tucek, J,
    Title = Novel solid-state synthesis of alpha-Fe and Fe(3)O(4) nanoparticles
       embedded in a MgO matrix,
    Journal = NANOTECHNOLOGY,
    Year = 2006,
    Volume = 17,
    Number = 2,
    Pages = 607-616,
    Month = JAN 28,
    Abstract = Thermally induced reduction of amorphous Fe(2)O(3) nanopowder (2-3 nm)
       with nanocrystalline Mg (similar to 20 nm) under a hydrogen atmosphere
       is presented as a novel route to obtain alpha-Fe and Fe(3)O(4) magnetic
       nanoparticles dispersed in a MgO matrix. The phase composition,
       structural and magnetic properties, size and morphology of the
       nanoparticles were monitored by x-ray diffraction, (57)Fe Mossbauer
       spectroscopy at temperatures of 24-300 K, transmission electron
       microscopy and magnetic measurements. Spherical magnetite nanoparticles
       prepared at a reaction temperature of 300 degrees C revealed a
       well-defined structure, with a ratio of tetrahedral to octahedral Fe
       sites of 1/2 being common for the bulk material. A narrow particle size
       distribution (20-30 nm) and high saturation magnetization (95 +/- 5 A
       m(2) kg(-1)) predispose the magnetite nanoparticles to various
       applications, including magnetic separation processes. The Verwey
       transition of Fe(3)O(4) nanocrystals was found to be decreased to about
       80 K. The deeper reduction of amorphous ferric oxide at 600 degrees C
       allows alpha-Fe (40-50 nm) nanoparticles to be synthesized with a
       coercive force of about 30 mT. They have a saturation magnetization 2.2
       times higher than that of synthesized magnetite nanoparticles, which
       corresponds well with the ratio usually found for the pure bulk phases.
       The magnetic properties of alpha-Fe nanocrystals combined with the high
       chemical and thermal stability of the MgO matrix makes the prepared
       nanocomposite useful for various magnetic applications.,
    DOI = 10.1088/0957-4484/17/2/044,
    ISSN = 0957-4484,
    Unique-ID = ISI:000235221800045,
    
  • [DOI] J. Filip, M. Novak, A. Beran, and R. Zboril, "Crystal chemistry and OH defect concentrations in spodumene from
    different granitic pegmatites," PHYSICS AND CHEMISTRY OF MINERALS, vol. 32, iss. 10, pp. 733-746, 2006.
    [Bibtex]
    @article ISI:000234687100009,
    Author = Filip, J and Novak, M and Beran, A and Zboril, R,
    Title = Crystal chemistry and OH defect concentrations in spodumene from
       different granitic pegmatites,
    Journal = PHYSICS AND CHEMISTRY OF MINERALS,
    Year = 2006,
    Volume = 32,
    Number = 10,
    Pages = 733-746,
    Month = JAN,
    Abstract = Thirty spodumene samples of distinct paragenetic types ( primary
       magmatic, secondary after petalite and hydrothermal) from variety of
       granitic pegmatites were characterized by electron microprobe, polarized
       FTIR spectroscopy and Mossbauer spectroscopy. The FTIR spectra of OH (
       weak sharp pleochroic bands at 3,425, 3,410, 3,395 cm(-1) and in the
       3,500 - 3,470 spectral region) are strongly polarized with maximum
       absorption parallel to n(gamma). The majority of OH dipoles are
       presumably generated by a partial replacement of O2 oxygen atoms with an
       orientation pointing above the Li vacancy site. The separation of the
       bands probably resulted from a replacement of the coordinating Al by Fe
       and Si by Al. Homogeneous spodumene mostly close to its ideal formula
       LiAlSi(2)O(6) shows Fe (0.00 - 0.10 apfu as Fe(3+); Fe(3+) >> Fe(2+))
       and Na (0.00 - 0.04 apfu) as the only minor cations and Fe(3+) Al(-1)
       substitution up to 10 mol\% of the LiFe(3+) Si(2)O(6) component.
       Hydrogen concentrations (from 0.1 up to < 5 ppm H(2)O by weight) vary as
       a function of genetic type with the highest amounts in high-temperature
       magmatic spodumene. Differences among particular genetic types of
       spodumene are related to maximum solubility of OH in spodumene structure
       at given P - T conditions and at actual chemical composition of
       spodumene. OH defect concentrations in spodumene follow a trend, LT/LP
       pyroxenes containing lower hydrogen contents compared to HT/HP ones. The
       hydrogen contents in particular genetic types of spodumene and their
       decrease with decreasing T and P are consistent with petrologic models
       of the pegmatite ( sub) types formations.,
    DOI = 10.1007/s00269-005-0051-0,
    ISSN = 0342-1791,
    Unique-ID = ISI:000234687100009,
    
  • [DOI] M. Mashlan, A. Kholmetskii, V. Yevdokimov, H. Pechousek, O. Verich, R. Zboril, and R. Tsonchev, "Mossbauer spectrometer with resonant detector," NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM
    INTERACTIONS WITH MATERIALS AND ATOMS
    , vol. 243, iss. 1, pp. 241-246, 2006.
    [Bibtex]
    @article ISI:000234658800040,
    Author = Mashlan, M and Kholmetskii, A and Yevdokimov, V and Pechousek, H and
       Verich, O and Zboril, R and Tsonchev, R,
    Title = Mossbauer spectrometer with resonant detector,
    Journal = NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM
       INTERACTIONS WITH MATERIALS AND ATOMS,
    Year = 2006,
    Volume = 243,
    Number = 1,
    Pages = 241-246,
    Month = JAN,
    Abstract = A Mossbauer spectrometer with a collective synchronous motion of the
       radioactive source and resonant detector has been built. The new special
       transducer with four drive coils and one velocity pickup coil has been
       developed. The drive coils are distributed over a perimeter of the
       moving frame, which connects the source and resonant detector. This
       configuration ensures an effective suppression of any mechanical
       vibrations and excitations in the moving frame. The polyamide fibers
       serve as suspension brackets, barium ferrite magnets are used. The
       mechanical construction of the transducer allows the use of various
       cryostats and furnaces, because the sample is immovable. The
       spectrometer developed provides an effective application of resonant
       detectors in a wide range of absorber temperatures. (c) 2005 Elsevier
       B.V. All rights reserved.,
    DOI = 10.1016/j.nimb.2005.07.208,
    ISSN = 0168-583X,
    Unique-ID = ISI:000234658800040,
    
  • [DOI] M. Miglierini, T. Kanuch, P. Svec, T. Krenicky, M. Vujtek, and R. Zboril, "Magnetic microstructure of NANOPERM-type nanocrystalline alloys," PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, vol. 243, iss. 1, pp. 57-64, 2006.
    [Bibtex]
    @article ISI:000234925800010,
    Author = Miglierini, M and Kanuch, T and Svec, P and Krenicky, T and Vujtek, M
       and Zboril, R,
    Title = Magnetic microstructure of NANOPERM-type nanocrystalline alloys,
    Journal = PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS,
    Year = 2006,
    Volume = 243,
    Number = 1,
    Pages = 57-64,
    Month = JAN,
    Note = European Conference on Physics of Magnetism (PM 05), Poznan, POLAND, JUN
       24-27, 2005,
    Abstract = Controlled crystallization of amorphous NANOPERM-type Fe76Mo8Cu1B15
       alloy leads to the formation of crystalline grains of about 10 nm in
       size. The evolution of crystallization and its impact on the resulting
       magnetic properties is followed by nuclear and atomic based techniques
       of (subatomic) structural characterization comprising Mossbauer
       spectrometry, X-ray diffraction, transmission electron microscopy, high
       resolution transmission electron microscopy, differential scanning
       calorimetry, and atomic force microscopy. The amount of nanocrystalline
       grains identified as bcc-Fe rises with temperature of annealing and
       influences magnetic states of the original amorphous precursor. Results
       of structural characterization are correlated with magnetic data
       obtained from macroscopic measurements. In the samples with low contents
       of nanocrystallites, a deterioration of soft magnetic properties is
       observed. A very good soft magnetic behaviour is regained, however,
       towards the end of the primary crystallization process. (c) 2006
       WILEY-VCH Verlag GmbH \& Co. KGaA, Weinheim.,
    DOI = 10.1002/pssb.200562446,
    ISSN = 0370-1972,
    Unique-ID = ISI:000234925800010,
    
  • [DOI] M. Hermanek, R. Zboril, M. Mashlan, L. Machala, and O. Schneeweiss, "Thermal behaviour of iron(II) oxalate dihydrate in the atmosphere of its
    conversion gases," JOURNAL OF MATERIALS CHEMISTRY, vol. 16, iss. 13, pp. 1273-1280, 2006.
    [Bibtex]
    @article ISI:000236115100009,
    Author = Hermanek, M and Zboril, R and Mashlan, M and Machala, L and Schneeweiss,
       O,
    Title = Thermal behaviour of iron(II) oxalate dihydrate in the atmosphere of its
       conversion gases,
    Journal = JOURNAL OF MATERIALS CHEMISTRY,
    Year = 2006,
    Volume = 16,
    Number = 13,
    Pages = 1273-1280,
    Abstract = Using a device for thermogravimetric analysis, a dynamic study of
       thermally induced solid-state transformations of FeC(2)O(4)(.)2H(2)O in
       the atmosphere allowing full participation of gaseous products (CO, CO2,
       H2O) in the reaction system was carried out. Solid phases formed at
       various temperatures between 25 and 640 degrees C were identified and
       characterized using Fe-57 Mossbauer spectroscopy, TG and XRD. Up to 230
       degrees C, evolution of two molecules of the water of crystallization
       takes place. Superparamagnetic nanoparticles of magnetite (Fe3O4) are
       formed as the primary product of the decomposition of FeC2O4, together
       with gaseous CO and CO2. In the next stage above 380 degrees C, the
       crystallization of magnetite is accompanied by a reduction of the
       remaining ferrous oxalate to iron carbide (Fe3C) by carbon monoxide.
       Thermally induced conversion of iron carbide into alpha-Fe and carbon is
       expected between 400 and 535 degrees C as the major chemical process. In
       the last reaction step, above 535 degrees C, magnetite is reduced to
       wustite (FeO) by carbon monoxide evolved at lower temperatures. On the
       grounds of quantitative Mossbauer data possible competitive reactions
       are discussed and a temperature dependent reaction model is suggested.,
    DOI = 10.1039/b514565a,
    ISSN = 0959-9428,
    Unique-ID = ISI:000236115100009,
    
  • [DOI] O. Schneeweiss, R. Zboril, N. Pizurova, and M. Mashlan, "Preparation and properties of iron and iron oxide nanocrystals in MgO
    matrix," HYPERFINE INTERACTIONS, vol. 164, iss. 1-4, pp. 35-40, 2006.
    [Bibtex]
    @article ISI:000239364000005,
    Author = Schneeweiss, O. and Zboril, R. and Pizurova, N. and Mashlan, M.,
    Title = Preparation and properties of iron and iron oxide nanocrystals in MgO
       matrix,
    Journal = HYPERFINE INTERACTIONS,
    Year = 2006,
    Volume = 164,
    Number = 1-4,
    Pages = 35-40,
    Month = JUL,
    Note = 8th International Conference on Solid State Physics/Workshop Mossbauer
       Spectroscopy of Locally Heterogeneous Systems, Almaty, KAZAKHSTAN, AUG
       23-26, 2004,
    Abstract = We have prepared alpha-iron and magnetite (Fe3O4) nanoparticles in MgO
       matrix from a mixture of nanocrystalline Fe2O3 with Mg(H,O) powders
       calcinated in hydrogen. This procedure yielded spherical magnetic
       nanoparticles embedded in MgO. Transmission electron microscopy and
       Mossbauer spectroscopy were used for structure and phase analysis. The
       measurements of magnetic properties showed increased coercivity of the
       nanocomposite samples.,
    DOI = 10.1007/s10751-006-9232-6,
    ISSN = 0304-3843,
    Unique-ID = ISI:000239364000005,
    

2005

  • [DOI] D. Jancik, M. Mashlan, R. Zboril, J. Adetunji, and K. Nomura, "A new fast type of Mossbauer spectrometer for the rapid determination of
    iron-bearing minerals used in the paint industry," CZECHOSLOVAK JOURNAL OF PHYSICS, vol. 55, iss. 7, pp. 803-811, 2005.
    [Bibtex]
    @article ISI:000231635800005,
    Author = Jancik, D and Mashlan, M and Zboril, R and Adetunji, J and Nomura, K,
    Title = A new fast type of Mossbauer spectrometer for the rapid determination of
       iron-bearing minerals used in the paint industry,
    Journal = CZECHOSLOVAK JOURNAL OF PHYSICS,
    Year = 2005,
    Volume = 55,
    Number = 7,
    Pages = 803-811,
    Month = JUL,
    Note = International Colloquium on Mossbauer Spectroscopy in Materials Science,
       Vsemina, CZECH REPUBLIC, JUN 01-04, 2004,
    Abstract = A new miniaturised Mossbauer spectrometer has been developed for
       laboratory and industrial application. Equipped with a YAlO(3):Ce
       crystal fast scintillation detector unit and mini transducer for the
       energy modulation of gamma rays, the unique mechanical design enhances
       protection from radiation and prevents disturbance by mechanical
       vibrations. It can be used with various types of cryostat and furnace.
       Supported by the LabVIEW graphical programming environment and by the
       new algorithm for the quantification of iron-components, the
       spectrometer can be used as a single-purpose instrument for the rapid
       determination of the Fe(2+)/Fe(3+) ratio in ilmenite and Morin
       transition temperature of hematite. It can also be used to monitor the
       manufacturing processes for titanium white and copperas red.,
    DOI = 10.1007/s10582-005-0082-2,
    ISSN = 0011-4626,
    Unique-ID = ISI:000231635800005,
    
  • [DOI] J. Tucek and R. Zboril, "Zero-field and in-field Mossbauer spectroscopy as a tool for structural
    and magnetic characterization of maghemite (gamma-Fe(2)O(3))
    nanoparticles," CZECHOSLOVAK JOURNAL OF PHYSICS, vol. 55, iss. 7, pp. 893-911, 2005.
    [Bibtex]
    @article ISI:000231635800014,
    Author = Tucek, J and Zboril, R,
    Title = Zero-field and in-field Mossbauer spectroscopy as a tool for structural
       and magnetic characterization of maghemite (gamma-Fe(2)O(3))
       nanoparticles,
    Journal = CZECHOSLOVAK JOURNAL OF PHYSICS,
    Year = 2005,
    Volume = 55,
    Number = 7,
    Pages = 893-911,
    Month = JUL,
    Note = International Colloquium on Mossbauer Spectroscopy in Materials Science,
       Vsemina, CZECH REPUBLIC, JUN 01-04, 2004,
    Abstract = Nowadays, nanoparticles of maghemite (gamma-Fe(2)O(3)) represent one of
       the most useful materials in modern advanced nanotechnological
       applications due to their superior magnetic properties. For their
       characterization, (57)Fe zero-field and in-field Mossbauer spectroscopy
       have proved themselves to be very powerful and effective tools which are
       crucial for an investigation of the local surrounding of iron atoms and
       observation of dynamic effects. The structural and magnetic
       characteristics of maghemite and its nanoparticles are thus discussed
       with regard to their zero-field and in-field Mossbauer spectra recorded
       at various temperatures and applied external magnetic fields. In
       addition, a special attention is also devoted to remarkable physical
       phenomena (superparamagnetism, spin canting) occurring largely in
       maghemite nanosized particles.,
    DOI = 10.1007/s10582-005-0091-1,
    ISSN = 0011-4626,
    Unique-ID = ISI:000231635800014,
    
  • R. Zboril, L. Machala, M. Mashlan, and M. Hermanek, "Nanocrystalline iron(III) oxides formed under dynamic heating of ferrous
    oxalate dihydrate in air," in Industrial Applications of the Mossbauer Effect, 2005, pp. 257-262.
    [Bibtex]
    @inproceedings ISI:000229434000039,
    Author = Zboril, R and Machala, L and Mashlan, M and Hermanek, M,
    Editor = Gracia, M and Marco, JF and Plazaola, F,
    Title = Nanocrystalline iron(III) oxides formed under dynamic heating of ferrous
       oxalate dihydrate in air,
    Booktitle = Industrial Applications of the Mossbauer Effect,
    Series = AIP CONFERENCE PROCEEDINGS,
    Year = 2005,
    Volume = 765,
    Pages = 257-262,
    Note = International Symposium on the Industrial Applications of the Mossbauer
       Effect, Madrid, SPAIN, OCT 04-08, 2004,
    Organization = Spansh Sci Council,
    Abstract = A dynamic study of the thermal decomposition of FeC2O4 center dot 2H(2)O
       has been carried out in air in the range of 25-500 degrees C with a
       heating rate of 5 degrees C/min using the conventional methods of
       thermal analysis including TG and DSC. The phase composition at
       different calcination temperatures was determined from Fe-57 Mossbauer
       spectra. It was found that the primary dehydration and liberation of
       carbon oxides from the oxalate structure is followed by a direct
       oxidation of Fe(II) to nanocrystalline Fe2O3 with a large surface area
       of about 250 m(2)/g. Such nanopowder is comprised of nanocrystalline
       particles of gamma- and alpha-Fe2O3 as proved by XRD, low temperature
       Mossbauer spectroscopy and HRTEM analysis. In contradiction with the
       literature assumption, no traces of magnetite (Fe3O4) have been
       identified during the oxidative decomposition in air. The simultaneous
       formation of both gamma- and alpha-Fe2O3 polymorphs at low temperatures
       is followed by an isochemical structural change of maghemite to
       hematite. The comparison of Mossbauer spectra taken at different
       temperatures proves clearly that maghemite appears in samples only as
       superparamagnetic particles at room temperature (RT), while all sextet
       components in RT Mossbauer spectra can be assigned to hematite particles
       with varying size distributions.,
    ISSN = 0094-243X,
    ISBN = 0-7354-0250-7,
    Unique-ID = ISI:000229434000039,
    
  • J. Pechousek, N. Mashlan, and R. Zboril, "Mossbauer spectrometer in the PXI/CompactPCI modular system," in INDUSTRIAL APPLICATIONS OF THE MOSSBAUER EFFECT, 2005, pp. 384-388.
    [Bibtex]
    @inproceedings ISI:000229434000060,
    Author = Pechousek, J and Mashlan, N and Zboril, R,
    Editor = Gracia, M and Marco, JF and Plazaola, F,
    Title = Mossbauer spectrometer in the PXI/CompactPCI modular system,
    Booktitle = INDUSTRIAL APPLICATIONS OF THE MOSSBAUER EFFECT,
    Series = AIP Conference Proceedings,
    Year = 2005,
    Volume = 765,
    Pages = 384-388,
    Note = International Symposium on the Industrial Applications of the Mossbauer
       Effect, Madrid, SPAIN, OCT 04-08, 2004,
    Organization = Spansh Sci Council,
    Abstract = Two commercially available modules, a digital oscilloscope (NI 5102) and
       a function generator (NI 5401) in the P)G (PCI eXtension for
       Instrumentation) or PCI standard from National Instruments Inc.,
       supported by the driver software, have been used for building a
       computer-based Mossbauer spectrometer. The RTSI (Real-Time System
       Integration) bus is used for synchronizing the accumulation of the
       detector impulses to the Mossbauer spectrum with velocity of the
       ``source-sample'' relative motion. The amplitude selection of the
       impulses from the detector output is based on the use of the Waveform
       Peak Detection. vi function. This function is available in the graphical
       programming environment LabVIEW 7 Express which serves for an
       implementation of the virtual instrument of the Mossbauer spectrometer.
       Mossbauer spectra can be accumulated in the constant and variable
       velocity modes; moreover, there is a possibility to register gamma-ray
       spectra in the multichannel analyzer mode. Two types of the detectors (a
       NaI(T1) and a resonance scintillation detector) have been used with the
       new Mossbauer spectrometer.,
    ISSN = 0094-243X,
    ISBN = 0-7354-0250-7,
    Unique-ID = ISI:000229434000060,
    
  • [DOI] H. Bartonkova, M. Mashlan, R. Zboril, J. Pechousek, O. Schneeweiss, and P. Martinec, "Mossbauer study of iron oxide modified montmorillonite," HYPERFINE INTERACTIONS, vol. 165, iss. 1-4, pp. 221-225, 2005.
    [Bibtex]
    @article ISI:000243551500033,
    Author = Bartonkova, H. and Mashlan, M. and Zboril, R. and Pechousek, J. and
       Schneeweiss, O. and Martinec, P.,
    Title = Mossbauer study of iron oxide modified montmorillonite,
    Journal = HYPERFINE INTERACTIONS,
    Year = 2005,
    Volume = 165,
    Number = 1-4,
    Pages = 221-225,
    Note = 28th International Conference on the Applications of the Mossbauer
       Effect (ICAME 2005), Montpellier, FRANCE, SEP 04-09, 2005,
    Organization = LAMMI UMR; CNRS,
    Abstract = Montmorillonite particles were modified by iron oxides using the
       precipitation process with the aim to monitor the differences in the
       structural and magnetic properties of intercalated and adsorbed Fe3+.
       The Mossbauer spectra recorded at 5 K in zero and 6 T external fields,
       IR spectra and TG curves measured in zero and 32 mT fields identified
       the ferrihydrite pillars in an interlayer space of the montmorillonite
       structure and gamma-Fe2O3 nanoparticles adsorbed on the mineral surface.
       The temperature dependent Mossbauer spectra (25-300 K) reflect the
       superparamagnetic behaviour of maghemite nanoparticles and ferrihydrite
       pillars with the blocking temperatures of about 80 and 25 K,
       respectively.,
    DOI = 10.1007/s10751-006-9269-6,
    ISSN = 0304-3843,
    Unique-ID = ISI:000243551500033,
    
  • [DOI] M. Miglierini, T. Kanuch, Y. Jiraskova, M. Mashlan, R. Zboril, and M. Vujtek, "Surface properties of Fe76Mo8Cu1B15 alloy after annealing," HYPERFINE INTERACTIONS, vol. 165, iss. 1-4, pp. 75-80, 2005.
    [Bibtex]
    @article ISI:000243551500011,
    Author = Miglierini, M. and Kanuch, T. and Jiraskova, Y. and Mashlan, M. and
       Zboril, R. and Vujtek, M.,
    Title = Surface properties of Fe76Mo8Cu1B15 alloy after annealing,
    Journal = HYPERFINE INTERACTIONS,
    Year = 2005,
    Volume = 165,
    Number = 1-4,
    Pages = 75-80,
    Note = 28th International Conference on the Applications of the Mossbauer
       Effect (ICAME 2005), Montpellier, FRANCE, SEP 04-09, 2005,
    Organization = LAMMI UMR; CNRS,
    Abstract = NANOPERM-type alloy Fe76Mo8Cu1B15 is investigated in amorphous and in
       partially crystallized state. Samples were prepared by I h isothermal
       annealing in vacuum at temperatures ranging from 330 degrees C up to 700
       degrees C. Bulk and surface microstructural characteristics were studied
       using transmission and conversion electron Mossbauer effect techniques,
       respectively. Surface features were checked by the help of atomic force
       microscopy. Presence of nanocrystalline bcc-Fe phase was detected during
       the first crystallization stage, The crystallization process starts at
       450 degrees C and it is more pronounced in surface regions than in the
       bulk. With progressing crystallization, hyperfine parameters especially
       of the amorphous residual phase are altered. Distinctions in surface
       morphology are revealed between wheel and air side of the ribbon-shaped
       samples.,
    DOI = 10.1007/s10751-006-9250-4,
    ISSN = 0304-3843,
    Unique-ID = ISI:000243551500011,
    
  • [DOI] L. Kvitek, R. Prucek, A. Panacek, R. Novotny, J. Hrbac, and R. Zboril, "The influence of complexing agent concentration on particle size in the
    process of SERS active silver colloid synthesis," JOURNAL OF MATERIALS CHEMISTRY, vol. 15, iss. 10, pp. 1099-1105, 2005.
    [Bibtex]
    @article ISI:000227320600013,
    Author = Kvitek, L and Prucek, R and Panacek, A and Novotny, R and Hrbac, J and
       Zboril, R,
    Title = The influence of complexing agent concentration on particle size in the
       process of SERS active silver colloid synthesis,
    Journal = JOURNAL OF MATERIALS CHEMISTRY,
    Year = 2005,
    Volume = 15,
    Number = 10,
    Pages = 1099-1105,
    Abstract = A one-step chemical reduction route towards silver colloid particles
       with controllable sizes ranging from 45 to 380 nm is reported in this
       article. Silver particles, prepared by the reduction of
       [Ag(NH3)(2)](+) complex with various reducing sugars, were
       characterised by means of transmission electron microscopy ( TEM),
       dynamic light scattering ( DLS) measurement of particle size
       distribution, and UV-VIS spectroscopy. The concentration of ammonia in
       the reaction mixture and the choice of the reducing sugar are the key
       parameters in the control of particle size. Synthesised silver colloid
       particles were successfully tested for use in surface-enhanced Raman
       spectroscopy (SERS) with 1-methyladenine as a testing substance.,
    DOI = 10.1039/b417007e,
    ISSN = 0959-9428,
    Unique-ID = ISI:000227320600013,
    
  • K. Nomura, R. Zboril, M. Mashlan, A. Rykov, and I. Felner, "Mossbauer study of (Ca,Sr)RuO3 doped with Fe-57," in Industrial Applications of the Mossbauer Effect, 2005, pp. 233-238.
    [Bibtex]
    @inproceedings ISI:000229434000035,
    Author = Nomura, K and Zboril, R and Mashlan, M and Rykov, A and Felner, I,
    Editor = Gracia, M and Marco, JF and Plazaola, F,
    Title = Mossbauer study of (Ca,Sr)RuO3 doped with Fe-57,
    Booktitle = Industrial Applications of the Mossbauer Effect,
    Series = AIP CONFERENCE PROCEEDINGS,
    Year = 2005,
    Volume = 765,
    Pages = 233-238,
    Note = International Symposium on the Industrial Applications of the Mossbauer
       Effect, Madrid, SPAIN, OCT 04-08, 2004,
    Organization = Spansh Sci Council,
    Abstract = 2\% of Fe-57 doped in Ca1-xSrxRuO3 materials (x ranging from 0 to 1)
       were prepared by a sol-gel method. The influence of the Sr/Ca ratio on
       the Structural and magnetic properties of ruthenates was investigated by
       XRD and Mossbauer spectroscopy (15 - 300 K). The refined lattice
       parameters indicate an expansion of the unit cell volume with Sr and a
       transition of the crystal symmetry from orthorhombic for x < 0.4 to
       tetragonal for higher Sr content. This transition is also manifested in
       the Fe Mossbauer spectra through the change of (a) the quadrupole
       splitting parameter, (similar to 0.1 mm/s for x=0 and similar to 0 or
       slightly negative for x >= 0.4 samples). (b) The isomer shift (c) the
       magnetic hyperfine parameters (H-eff), and (d) the magnetic transition
       temperature, which increase with x. The temperature dependence of H-eff
       is significantly different for the (CaRu0.98Fe0.02O3)-Fe-57 as compared
       to samples with x = 0.6, 0.8 and 1. In the latter materials, Mossbauer
       spectra at low temperatures show a much wider distribution in Heff In
       particular, the field maximum probability decreases progressively with
       T, whereas for the x=0 material, it remains almost constant. Such
       behavior is closely related with the literature data on a spin glass
       ordering of Ca1-xSrxRuO3 with x < 0.2 and a ferromagnetic behavior for
       the rich Sr samples.,
    ISSN = 0094-243X,
    ISBN = 0-7354-0250-7,
    Unique-ID = ISI:000229434000035,
    

2004

  • [DOI] R. Zboril, L. Machala, M. Mashlan, and V. Sharma, "Iron(III) oxide nanoparticles in the thermally induced oxidative
    decomposition of Prussian Blue, Fe(4)[Fe(CN)(6)](3)," CRYSTAL GROWTH & DESIGN, vol. 4, iss. 6, pp. 1317-1325, 2004.
    [Bibtex]
    @article ISI:000224983100034,
    Author = Zboril, R and Machala, L and Mashlan, M and Sharma, V,
    Title = Iron(III) oxide nanoparticles in the thermally induced oxidative
       decomposition of Prussian Blue, Fe(4)[Fe(CN)(6)](3),
    Journal = CRYSTAL GROWTH \& DESIGN,
    Year = 2004,
    Volume = 4,
    Number = 6,
    Pages = 1317-1325,
    Month = NOV-DEC,
    Abstract = The thermally induced decomposition of Prussian Blue,
       Fe(4)[Fe(CN)(6)](3) (PB), was studied in air at 250 and 350 C.
       Amorphous Fe(2)O(3) nanoparticles, cubic bixbyite beta- and cubic spinel
       gamma-Fe(2)O(3) (maghemite) polymorphs, have been identified as the
       products of the decomposition under different reaction conditions.
       (57)Fe Mossbauer spectroscopy, XRD, AFM, TEM, quasielastic light
       scattering method (QELS) of particle size analysis, BET surface area,
       and magnetization measurements were used to understand the influence of
       the PB particle size and oxidation conditions on the decomposition
       mechanism at 250 and 350 C. At a minimum decomposition temperature of
       250 degreesC, amorphous Fe(2)O(3) nanoparticles were formed with the
       size ranging from 1 to 4 nm and large surface area of 400-200 m(2)/g in
       dependence on the PB particle size. Such small amorphous Fe(2)O(3)
       nanoparticles were obtained by the solid-state route for the first time.
       At 350 degreesC, cubic beta-Fe(2)O(3) and gamma-Fe(2)O(3) polymorphs
       were identified and their contents were found to be strongly dependent
       on the initial PB particle size and oxidation-diffusion conditions.
       Generally, the higher relative content of gamma-Fe(2)O(3) was obtained
       for larger PB particles and in air-limited conditions.,
    DOI = 10.1021/cg049748+,
    ISSN = 1528-7483,
    Unique-ID = ISI:000224983100034,
    
  • [DOI] P. Kopel, Z. Travnicek, R. Zboril, and J. Marek, "Synthesis, X-ray and Mossbauer study of iron(II) complexes with
    trithiocyanuric acid (ttcH(3)). The X-ray structures of
    [Fe(bpy)(3)](ttcH) center dot 2bpy center dot 7H(2)O and
    [Fe(phen)(3)](ttcH(2))(ClO4) center dot 2CH(3)OH center dot 2H(2)O," POLYHEDRON, vol. 23, iss. 14, pp. 2193-2202, 2004.
    [Bibtex]
    @article ISI:000224160200002,
    Author = Kopel, P and Travnicek, Z and Zboril, R and Marek, J,
    Title = Synthesis, X-ray and Mossbauer study of iron(II) complexes with
       trithiocyanuric acid (ttcH(3)). The X-ray structures of
       [Fe(bpy)(3)](ttcH) center dot 2bpy center dot 7H(2)O and
       [Fe(phen)(3)](ttcH(2))(ClO4) center dot 2CH(3)OH center dot 2H(2)O,
    Journal = POLYHEDRON,
    Year = 2004,
    Volume = 23,
    Number = 14,
    Pages = 2193-2202,
    Month = SEP 9,
    Abstract = Iron(II) complexes with a combination of nitrogen-donor ligands and
       trithiocyanuric acid (ttcH(3)) of the composition [Fe(bpy)(2)(ttcH)]
       (.) 2H(2)O (1), [Fe(bpY)(3)](ttcH) (.) 2bpy (.) 7H(2)O (2),
       [Fe(terpyCl)(2)](ttcH(2))(2) (.) H2O (3), [Fe(phen)(2)(ttcH)] (.)
       2H(2)O (4), [Fe-(nphen)(2)(ttcH)] (.) 4H(2)O (5) and
       [Fc(phen)(3)](ttcH(2))(ClO4) (.) 2CH(3)OH (.) 2H(2)O (6), where bpy =
       2,2'-bipyridine, terpyCl = 4'-chloro-2,2':6',2'-terpyridine, phen =
       1,10-phenanthroline, nphen = 5-nitro-1,10-phenanthroline, have been
       prepared. The compounds, except for 6, have been characterized by
       elemental analysis, Fe-57 Mossbauer, IR and UV-Vis spectroscopies. It
       has been found that the trithiocyanurate ion is either coordinated to
       the metal centre (1, 4 and 5) or situated outside the inner coordination
       sphere of the iron(II) ion (2, 3 and 6). The X-ray crystal structures of
       complexes 2 and 6 demonstrate that the ligands enforce a distorted
       octahedral geometry on the Fell ions with monoanionic 2 and dianionic 6
       forms of uncoordinated trithiocyanuric acid. Density-functional theory
       (DFT) calculations (B3LYP/6-31 + G*) were used for the geometry
       optimisation and infrared frequencies calculations of differently
       protonated forms of the acid (ttcH(3), ttcH(2)(-) and ttcH(2)(-)). (C)
       2004 Elsevier Ltd. All rights reserved.,
    DOI = 10.1016/j.poly.2004.06.024,
    ISSN = 0277-5387,
    Unique-ID = ISI:000224160200002,
    
  • [DOI] M. Mashlan, V. Yevdokimov, J. Pechousek, R. Zboril, and A. Kholmetskii, "Mossbauer spectrometer with novel moving system and resonant detection
    of gamma rays," HYPERFINE INTERACTIONS, vol. 156, iss. 1, pp. 15-19, 2004.
    [Bibtex]
    @article ISI:000224130500004,
    Author = Mashlan, M and Yevdokimov, V and Pechousek, J and Zboril, R and
       Kholmetskii, A,
    Title = Mossbauer spectrometer with novel moving system and resonant detection
       of gamma rays,
    Journal = HYPERFINE INTERACTIONS,
    Year = 2004,
    Volume = 156,
    Number = 1,
    Pages = 15-19,
    Month = JUN-SEP,
    Note = 27th International Conference on the Applications of the Mossbauer
       Effect, Muscat, OMAN, SEP 21-25, 2003,
    Abstract = A Mossbauer spectrometer with the collective synchronous motion of the
       radioactive source and resonant detector has been built. The new special
       transducer with four drive coils and one velocity pickup coil has been
       developed. The polyamide fibers serve as suspension brackets, barium
       ferrite magnets are used. The mechanical construction of transducer
       allows using different cryostats and furnaces, because the sample is
       immovable. The resonant detector consists of the thin foil of the
       organic plastic scintillator with the dissolved substance converting the
       resonant gamma rays to conversion electrons.,
    DOI = 10.1023/B:HYPE.0000043202.86190.55,
    ISSN = 0304-3843,
    Unique-ID = ISI:000224130500004,
    
  • [DOI] R. Zboril, M. Mashlan, L. Machala, J. Walla, K. Barcova, and P. Martinec, "Characterization and thermal behaviour of garnets from almandine-pyrope
    series at 1200 degrees C," HYPERFINE INTERACTIONS, vol. 156, iss. 1, pp. 403-410, 2004.
    [Bibtex]
    @article ISI:000224130500062,
    Author = Zboril, R and Mashlan, M and Machala, L and Walla, J and Barcova, K and
       Martinec, P,
    Title = Characterization and thermal behaviour of garnets from almandine-pyrope
       series at 1200 degrees C,
    Journal = HYPERFINE INTERACTIONS,
    Year = 2004,
    Volume = 156,
    Number = 1,
    Pages = 403-410,
    Month = JUN-SEP,
    Note = 27th International Conference on the Applications of the Mossbauer
       Effect, Muscat, OMAN, SEP 21-25, 2003,
    Abstract = The natural garnets from almandine (Fe3Al2Si3O12) -pyrope (Mg3Al2Si3O12)
       series with the iron to magnesium atomic ratio ranging from 0.2 to 1
       were characterised and their thermal behaviour at 1200degreesC studied
       by Fe-57 Mossbauer spectroscopy, X-ray powder diffraction, X-ray
       fluorescence, DTA, TG and electron microprobe analysis. The pyrope-type
       samples with a dominant magnesium content at position 24c in the cubic
       garnet structure undergo oxidative decomposition at 1200degreesC
       resulting in the formation of the paramagnetic spinel Mg(Al, Fe)(2)O-4
       structure with a low iron content, enstatite (Mg, Fe) SiO3 and anorthite
       CaAl2Si2O8 as the host compound for calcium. Contrary to pyropes, the
       iron-rich garnets exhibit complete oxidation at 1200degreesC conforming
       to the formation of magnetically ordered nanocrystalline gamma-Fe2O3 or
       Mg(Fe, Al)(2)O-4 spinels depending on the initial chemical composition
       of the garnets. In the reaction products of iron-rich garnets,
       cordierite (Mg2Al4Si5O18) and anorthite were identified as non-ferrous
       phases.,
    DOI = 10.1023/B:HYPE.0000043260.24239.48,
    ISSN = 0304-3843,
    Unique-ID = ISI:000224130500062,
    
  • M. Mashlan, R. Zboril, L. Machala, M. Vujtek, J. Walla, and K. Nomura, "Mossbauer spectroscopy in study of thermally induced crystallization of
    amorphous Fe(2)O(3) nanoparticles," in ISMANAM 2003: METASTABLE, MECHANICALLY ALLOYED AND NANOCRYSTALLINE
    MATERIALS
    , 2004, pp. 641-647.
    [Bibtex]
    @inproceedings ISI:000223641200101,
    Author = Mashlan, M and Zboril, R and Machala, L and Vujtek, M and Walla, J and
       Nomura, K,
    Editor = Kiminami, CS and Bolfarini, C and BottaF, WJ,
    Title = Mossbauer spectroscopy in study of thermally induced crystallization of
       amorphous Fe(2)O(3) nanoparticles,
    Booktitle = ISMANAM 2003: METASTABLE, MECHANICALLY ALLOYED AND NANOCRYSTALLINE
       MATERIALS,
    Series = JOURNAL OF METASTABLE AND NANOCRYSTALLINE MATERIALS SERIES,
    Year = 2004,
    Volume = 20-21,
    Pages = 641-647,
    Note = 10th International Symposium on Metastable, Mechanically Alloyed and
       Nanocrystalline Materials (ISMANAM 2003), Foz do Iguacu, BRAZIL, AUG
       24-28, 2003,
    Abstract = (57)Fe Mossbauer spectroscopy is demonstrated as an effective tool in
       the identification, magnetic and structural characterization of
       iron(III) oxides formed by thermally induced oxidative decomposition of
       FeC(2)O(4).2H(2)O and by the secondary crystallization of amorphous
       Fe(2)O(3) nanopowder. AFM measurements revealed that the primary
       amorphous nanoparticles are between 1 and 3 nm, in accordance with the
       large surface area of 250 m(2)/g as determined by BET analysis. The
       temperature depended Mossbauer measurements of amorphous Fe(2)O(3)
       showed the magnetic transition temperature lower than 70 K with the
       sharp evolution of the spectral lines between 53 and 76 K as typical for
       ultrafine and strongly interacted particles. As the primary
       crystallization product at low temperatures, gamma-Fe(2)O(3) (maghemite)
       was identified by XRD. The broad distribution of magnetic fields in
       Mossbauer spectra illustrates the broad size distribution of maghemite
       nanoparticles. The thermally stable alpha-Fe(2)O(3) (hematite) can be
       produced by the direct crystallization of amorphous phase at higher
       temperatures or by the structural transformation of the primarily formed
       maghemite at lower temperatures. Particles of hematite formed at
       200degreesC reveal the Morin transition temperature suppressed below 20
       K corresponding to the size about 20 nm.,
    ISSN = 1422-6375,
    ISBN = 0-87849-944-X,
    Unique-ID = ISI:000223641200101,
    
  • [DOI] R. Zboril, L. Machala, M. Mashlan, M. Hermanek, M. Miglierini, and A. Fojtik, "Structural, magnetic and size transformations induced by isothermal
    treatment of ferrous oxalate dihydrate in static air conditions," in SECOND SEEHEIM CONFERENCE ON MAGNETISM, PROCEEDINGS, 2004, pp. 3583-3588.
    [Bibtex]
    @inproceedings ISI:000227060600080,
    Author = Zboril, R and Machala, L and Mashlan, M and Hermanek, M and Miglierini,
       M and Fojtik, A,
    Editor = Ghafari, M and Enz, T and Hahn, H,
    Title = Structural, magnetic and size transformations induced by isothermal
       treatment of ferrous oxalate dihydrate in static air conditions,
    Booktitle = SECOND SEEHEIM CONFERENCE ON MAGNETISM, PROCEEDINGS,
    Year = 2004,
    Pages = 3583-3588,
    Note = 2nd Seeheim Conference on Magnetism (SCM2004), Seeheim, GERMANY, JUN
       27-JUL 01, 2004,
    Organization = Deutsch Forsch Gemeinsch; Forsch Zentrum Karlsruhe; Darmstadt Univ
       Technol,
    Abstract = Thermal decomposition of the FeC2O4.2H(2)O powder has been studied
       isothermally in static air conditions at minimum decomposition
       temperature of 180 degreesC using Fe-57 Mossbauer spectroscopy, XRD,
       HRTEM, AFM and BET surface area measurements. Dehydration and liberation
       of carbon oxides from powdered sample is accompanied by direct oxidation
       of Fe(II) to nanocrystalline Fe2O3 without any indications of the
       stabilization of the magnetite (Fe3O4) phase. Decomposition process is
       completed after two hours and as-prepared nanopowder (3-5 nm), with a
       large surface area of about 250 m(2)/g, is comprised of ultrafine
       superparamagnetic particles of gamma-Fe2O3 (maghemite) and alpha-Fe2O3
       (hematite) as proved by low temperature Mossbauer spectroscopy, XRD and
       HRTEM analysis. The simultaneous formation of both polymorphs is
       probably related with the non-equivalent diffusion conditions on the
       surface and in the bulk of oxalate particles. With increasing time, the
       particle size induced phase transformation of maghemite to hematite has
       been observed by AFM and XRD. Mossbauer spectra demonstrate that
       maghemite particles are formed only in superparamagnetic state
       (doublet), while magnetic components (sextet) in room temperature
       spectra can be assigned exclusively to hematite particles with size
       distribution produced by gradual crystallization of primary
       superparamagnetic nanoparticles of the same structure as well as by the
       phase transition of maghemite phase. (C) 2004 WILEYNCH Verlag GmbH \&
       Co. KGaA, Weinheim.,
    DOI = 10.1002/pssc.200405511,
    ISBN = 3-527-40577-1,
    Unique-ID = ISI:000227060600080,
    
  • R. Zboril, L. Machalal, M. Mashlan, J. Tucek, R. Muller, and O. Schneeweiss, "Magnetism of amorphous Fe2O3 nanopowders synthesized by solid-state
    reactions," in SECOND SEEHEIM CONFERENCE ON MAGNETISM, PROCEEDINGS, 2004, pp. 3710-3716.
    [Bibtex]
    @inproceedings ISI:000227060600107,
    Author = Zboril, R and Machalal, L and Mashlan, M and Tucek, J and Muller, R and
       Schneeweiss, O,
    Editor = Ghafari, M and Enz, T and Hahn, H,
    Title = Magnetism of amorphous Fe2O3 nanopowders synthesized by solid-state
       reactions,
    Booktitle = SECOND SEEHEIM CONFERENCE ON MAGNETISM, PROCEEDINGS,
    Year = 2004,
    Pages = 3710-3716,
    Note = 2nd Seeheim Conference on Magnetism (SCM2004), Seeheim, GERMANY, JUN
       27-JUL 01, 2004,
    Organization = Deutsch Forsch Gemeinsch; Forsch Zentrum Karlsruhe; Darmstadt Univ
       Technol,
    Abstract = Monodispersed amorphous Fe2O3 nanoparticles with the size ranging from 1
       to 4 nm have been prepared by thermally induced oxidative decomposition
       of Prussian Blue, Fe-4[Fe(CN)(6)](3) in air. Amorphous nanopowders
       exhibit specific magnetic behaviour strongly affected by interparticle
       interactions and extremely low particle size with a high contribution of
       the surface anisotropy as illustrated by temperature dependent and
       external field Mossbauer spectroscopy and magnetization measurements
       (4-300 K). Some of the properties are in close similarity to those of
       spin glasses including the fast thermal variation of superparamagnetic
       fraction in the Mossbauer spectra, or the particle size independence of
       the blocking temperature, and non-saturation of magnetization even at 5
       K and magnetic field of 10 T. The reduced value of internal magnetic
       hyperfine field (similar to49 T at 5 K) and no indications of the
       tetrahedral Fe3+ sites in the 5T/5K external field Mossbauer spectra are
       the principal found differences in comparison with the magnetic
       behaviour of nanocrystalline gamma-Fe2O3. (C) 2004 WILEY-VCH Verlag GmbH
       \& Co. KGaA, Weinheim,
    ISBN = 3-527-40577-1,
    Unique-ID = ISI:000227060600107,
    

2003

  • [DOI] R. Zboril, M. Mashlan, K. Barcova, J. Walla, E. Ferrow, and P. Martinec, "Thermal behaviour of pyrope at 1000 and 1100 degrees C: mechanism of
    Fe(2+) oxidation and decomposition model," PHYSICS AND CHEMISTRY OF MINERALS, vol. 30, iss. 10, pp. 620-627, 2003.
    [Bibtex]
    @article ISI:000186463400005,
    Author = Zboril, R and Mashlan, M and Barcova, K and Walla, J and Ferrow, E and
       Martinec, P,
    Title = Thermal behaviour of pyrope at 1000 and 1100 degrees C: mechanism of
       Fe(2+) oxidation and decomposition model,
    Journal = PHYSICS AND CHEMISTRY OF MINERALS,
    Year = 2003,
    Volume = 30,
    Number = 10,
    Pages = 620-627,
    Month = OCT,
    Abstract = The mechanism of thermally induced oxidation of Fe(2+) from natural
       pyrope has been studied at 1000 and 1100 degreesC using (57)Fe Mossbauer
       spectroscopy in conjunction with XRD, XRF, AFM, QELS, TG, DTA and
       electron microprobe analyses. At 1000 degreesC, the non-destructive
       oxidation of Fe(2+) in air includes the partial stabilization of Fe(3+)
       in the dodecahedral 24c position of the garnet structure and the
       simultaneous formation of hematite particles (15-20 nm). The
       incorporation of the magnesium ions to the hematite structure results in
       the suppression of the Morin transition temperature to below 20 K. The
       general garnet structure is preserved during the redox process at 1000
       degreesC, in accordance with XRD and DTA data. At 1100 degreesC,
       however, oxidative conversion of pyrope to the mixed magnesium aluminium
       iron oxide, Fe-orthoenstatite and cristoballite was observed. During
       this destructive decomposition, Fe(2+) is predominantly oxidized and
       incorporated into the spinel structure of Mg(Al,Fe)(2)O(4) and partially
       stabilized in the structure of orthoenstatite, (Mg,Fe)SiO(3). The
       combination of XRD and Mossbauer data suggest the definite reaction
       mechanism prevailing, including the refinement of the chemical
       composition and quantification of the reaction products. The reaction
       mechanism indicates that the respective distribution of Fe(2+)and Fe(3+)
       to the enstatite and spinel structures is determined by the total
       content of Fe(2+) in pyrope.,
    DOI = 10.1007/s00269-003-0355-x,
    ISSN = 0342-1791,
    Unique-ID = ISI:000186463400005,
    
  • [DOI] A. Bourlinos, R. Zboril, and D. Petridis, "A simple route towards magnetically modified zeolites," MICROPOROUS AND MESOPOROUS MATERIALS, vol. 58, iss. 2, pp. 155-162, 2003.
    [Bibtex]
    @article ISI:000181423600008,
    Author = Bourlinos, AB and Zboril, R and Petridis, D,
    Title = A simple route towards magnetically modified zeolites,
    Journal = MICROPOROUS AND MESOPOROUS MATERIALS,
    Year = 2003,
    Volume = 58,
    Number = 2,
    Pages = 155-162,
    Month = MAR 4,
    Abstract = A simple route for decorating the external surfaces of zeolites with
       maghemite. nanoparticles is described. The synthesis comprises feeding
       of a zeolite support with different amounts of iron(III) by employing
       melt exchange reactions, exposure of the iron-containing solids to
       vapors of formic acid and finally calcination of the resulting
       derivatives in air to afford maghemite nanoparticles embedded in the
       zeolite host. The as-prepared magnetically modified solids,
       characterized by XRD, Mossbauer and magnetic measurements and SEM and
       TEM techniques, were found to retain the cation exchange capacity of the
       parent zeolite as well as its structural integrity. (C) 2002 Elsevier
       Science Inc. All rights reserved.,
    DOI = 10.1016/S1387-1811(02)00613-3,
    ISSN = 1387-1811,
    Unique-ID = ISI:000181423600008,
    
  • R. Zboril, M. Mashlan, L. Machala, and P. Bezdicka, "Iron(III) oxides formed during thermal conversion of rhombohedral
    iron(III) sulfate," in MATERIAL RESEARCH IN ATOMIC SCALE BY MOSSBAUER SPECTROSCOPY, 2003, pp. 21-30.
    [Bibtex]
    @inproceedings ISI:000183172700003,
    Author = Zboril, R and Mashlan, M and Machala, L and Bezdicka, P,
    Editor = Mashlan, M and Miglierini, M and Schaaf, P,
    Title = Iron(III) oxides formed during thermal conversion of rhombohedral
       iron(III) sulfate,
    Booktitle = MATERIAL RESEARCH IN ATOMIC SCALE BY MOSSBAUER SPECTROSCOPY,
    Series = NATO Science Series II-Mathematics Physics and Chemistry,
    Year = 2003,
    Volume = 94,
    Pages = 21-30,
    Note = Conference of the NATO Advanced Research Workshop on Material Research
       in Atomic Scale by Mossbauer Spectroscopy, SMOLENICE, SLOVAKIA, JUN
       01-06, 2002,
    Organization = NATO,
    Abstract = The mechanism of thermal decomposition of rhombohedral iron(Ill) sulfate
       in air depends significantly on the conditions for diffusion of SO(3)
       (temperature, thickness of the powdered layer, particle size). The
       influence of particle size on the reaction mechanism was studied at
       600degreesC using (57)Fe Mossbauer spectroscopy and XRD. Corundum-type
       alpha-Fe(2)O(3) bixbyite-type beta-Fe(2)O(3) and orthorhombic
       epsilon-Fe(2)O(3) were identified as solid conversion products. Time
       dependence of the relative contents of individual polymorphs
       (x-Fe(2)O(3)/SigmaFe(2)O(3)) is a suitable means for monitoring the
       mechanism of their formation and thermal transformation during the
       reaction process. The quantitative Mossbauer data obtained from the
       corresponding spectral areas demonstrate that different transformations
       occur in the surface, layer and in the bulk of sulfate particles.
       Particles of beta-Fe(2)O(3) formed after loosening Of SO(3) from the
       surface layer of sulfate particles are relatively stable at 600degreesC
       as documented by the very slow structural change to hematite. The
       formation of complicated epsilon-Fe(2)O(3) structure is probably related
       with the slow diffusion Of SO(3) from the bulk of sulfate particles. The
       isochemical transformation of epsilon-Fe(2)O(3) to hematite occurs more
       quickly due to its lower thermal stability in comparison with
       beta-Fe(2)O(3).,
    ISSN = 1568-2609,
    ISBN = 1-4020-1196-2,
    Unique-ID = ISI:000183172700003,
    
  • M. Mashlan, R. Zboril, and K. Barcova, "Mossbauer spectroscopy in studying the thermally induced oxidation of
    Fe2+ cations in iron-bearing silicate minerals - Examples of
    applications with almandine, pyrope and olivine," in MATERIAL RESEARCH IN ATOMIC SCALE BY MOSSBAUER SPECTROSCOPY, 2003, pp. 271-284.
    [Bibtex]
    @inproceedings ISI:000183172700028,
    Author = Mashlan, M and Zboril, R and Barcova, K,
    Editor = Mashlan, M and Miglierini, M and Schaaf, P,
    Title = Mossbauer spectroscopy in studying the thermally induced oxidation of
       Fe2+ cations in iron-bearing silicate minerals - Examples of
       applications with almandine, pyrope and olivine,
    Booktitle = MATERIAL RESEARCH IN ATOMIC SCALE BY MOSSBAUER SPECTROSCOPY,
    Series = NATO SCIENCE SERIES, SERIES II: MATHEMATICS, PHYSICS AND CHEMISTRY,
    Year = 2003,
    Volume = 94,
    Pages = 271-284,
    Note = Conference of the NATO Advanced Research Workshop on Material Research
       in Atomic Scale by Mossbauer Spectroscopy, SMOLENICE, SLOVAKIA, JUN
       01-06, 2002,
    Organization = NATO,
    ISBN = 1-4020-1196-2,
    Unique-ID = ISI:000183172700028,
    
  • [DOI] R. Zboril, M. Mashlan, V. Papaefthymiou, and G. Hadjipanayis, "Thermal decomposition of Fe(2)(SO(4))(3): Demonstration of Fe(2)O(3)
    polymorphism," JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, vol. 255, iss. 3, pp. 413-417, 2003.
    [Bibtex]
    @article ISI:000181237200003,
    Author = Zboril, R and Mashlan, M and Papaefthymiou, V and Hadjipanayis, G,
    Title = Thermal decomposition of Fe(2)(SO(4))(3): Demonstration of Fe(2)O(3)
       polymorphism,
    Journal = JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY,
    Year = 2003,
    Volume = 255,
    Number = 3,
    Pages = 413-417,
    Abstract = The mechanism of the thermal decomposition of Fe(2)(SO(4))(3) in air has
       been studied at different temperatures (520-700 degreesC) using mainly
       (57)Fe Mossbauer spectroscopy. Iron(III) oxides with corundum (alpha),
       bixbyite (beta), spinel (gamma) and orthorhombic (epsilon) structures
       were identified as solid products of this conversion. A significant
       influence of the heating temperature on the decomposition mechanism and
       on the phase composition of reaction products was found.,
    DOI = 10.1023/A:1022543323651,
    ISSN = 0236-5731,
    Unique-ID = ISI:000181237200003,
    
  • [DOI] K. Barcova, M. Mashlan, R. Zboril, and P. Martinec, "Mossbauer study of transformation mechanism of Fe cations in olivine
    after thermal treatments in air," JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, vol. 255, iss. 3, pp. 529-533, 2003.
    [Bibtex]
    @article ISI:000181237200025,
    Author = Barcova, K and Mashlan, M and Zboril, R and Martinec, P,
    Title = Mossbauer study of transformation mechanism of Fe cations in olivine
       after thermal treatments in air,
    Journal = JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY,
    Year = 2003,
    Volume = 255,
    Number = 3,
    Pages = 529-533,
    Abstract = The transformation mechanism of Fe cations in natural olivine after
       thermal treatments in air has been studied using mainly Fe-57 Mossbauer
       spectroscopy. gamma-Fe2O3 nanoparticles appear as the primary Fe3+ phase
       in Mossbauer spectra of olivine samples heated at 600-900 degreesC.
       These nanoparticles are thermally unstable and they are transformed to
       alpha-Fe2O3 with the increase of heating time. Another transformation
       mechanism of iron related with the complete decomposition of olivine
       structure has been observed at temperatures of 1000 degreesC and higher.
       The mixed oxide MgFe2O4 with the spinel structure and enstatite MgSiO3
       were identified as iron-bearing decomposition products.,
    DOI = 10.1023/A:1022588500878,
    ISSN = 0236-5731,
    Unique-ID = ISI:000181237200025,
    

2002

  • [DOI] R. Zboril, M. Mashlan, and D. Petridis, "Iron(III) oxides from thermal processes-synthesis, structural and
    magnetic properties, Mossbauer spectroscopy characterization, and
    applications," CHEMISTRY OF MATERIALS, vol. 14, iss. 3, pp. 969-982, 2002.
    [Bibtex]
    @article ISI:000174534800008,
    Author = Zboril, R and Mashlan, M and Petridis, D,
    Title = Iron(III) oxides from thermal processes-synthesis, structural and
       magnetic properties, Mossbauer spectroscopy characterization, and
       applications,
    Journal = CHEMISTRY OF MATERIALS,
    Year = 2002,
    Volume = 14,
    Number = 3,
    Pages = 969-982,
    Month = MAR,
    Abstract = Structural and magnetic properties, methods of synthesis, and
       applications of seven iron(III) oxide polymorphs, including rare beta,
       epsilon, amorphous, and high-pressure forms, are reviewed. Thermal
       transformations resulting in the formation of iron oxides are classified
       according to different parameters, and their mechanisms are discussed.
       (57)Fe Mossbauer spectroscopy is presented as a powerful tool for the
       identification, distinction, and characterization of individual
       polymorphs. The advantages of Mossbauer spectroscopy are demonstrated
       with two examples related to the study of the thermally induced
       solid-state reactions of Fe(2)(SO(4))(3).,
    DOI = 10.1021/cm0111074,
    ISSN = 0897-4756,
    Unique-ID = ISI:000174534800008,
    
  • [DOI] R. Zboril, M. Mashlan, D. Petridis, D. Krausova, and P. Pikal, "The role of intermediates in the process of red ferric pigment
    manufacture from FeSO(4)center dot 7H(2)O," HYPERFINE INTERACTIONS, vol. 139, iss. 1-4, pp. 437-445, 2002.
    [Bibtex]
    @article ISI:000179497300048,
    Author = Zboril, R and Mashlan, M and Petridis, D and Krausova, D and Pikal, P,
    Title = The role of intermediates in the process of red ferric pigment
       manufacture from FeSO(4)center dot 7H(2)O,
    Journal = HYPERFINE INTERACTIONS,
    Year = 2002,
    Volume = 139,
    Number = 1-4,
    Pages = 437-445,
    Note = 5th International Symposium on the Industrial Applications of the
       Mossbauer Effect, VIRGINIA BEACH, VA, AUG 13-18, 2000,
    Organization = Condensed Matter \& Mat Phys Res Grp,
    Abstract = One method of industrial manufacture of red ferric pigments is based on
       the thermal decomposition of FeSO(4).7H(2)O into
       alpha-Fe(2)O(3)(copperas red). The difficult reproducibility of the
       color quality of the final pigment is the main problem of this process.
       One of the factors that can influence the pigment color is contamination
       by some of the intermediates formed during the transformation process.
       The identification of two groups of intermediates is the basic result of
       an extensive laboratory investigation carried out using (57)Fe Mossbauer
       spectroscopy and X-ray powder diffraction (XRD). The first group of
       intermediates includes sulfato-phases as FeSO(4).H(2)O, FeSO(4), Fe(OH)
       SO(4), Fe(2)O(SO(4))(2), Fe(2)O(SO(4))(2).xH(2)O xis an element of(0,
       1), and Fe(2)(SO(4))(3). Thermally metastable polymorphs of iron(III)
       oxide, beta-Fe(2)O(3), gamma-Fe(2)O(3) and epsilon-Fe(2)O(3), represent
       the other group. Mossbauer characterization of all intermediate products
       is given. A significant influence of beta-Fe(2)O(3) on the pigment color
       was found.,
    DOI = 10.1023/A:1021259432720,
    ISSN = 0304-3843,
    Unique-ID = ISI:000179497300048,
    
  • [DOI] R. Zboril, M. Mashlan, K. Barcova, and M. Vujtek, "Thermally induced solid-state syntheses of gamma-Fe2O3 nanoparticles and
    their transformation to alpha-Fe2O3 via epsilon-Fe2O3," HYPERFINE INTERACTIONS, vol. 139, iss. 1-4, pp. 597-606, 2002.
    [Bibtex]
    @article ISI:000179497300066,
    Author = Zboril, R and Mashlan, M and Barcova, K and Vujtek, M,
    Title = Thermally induced solid-state syntheses of gamma-Fe2O3 nanoparticles and
       their transformation to alpha-Fe2O3 via epsilon-Fe2O3,
    Journal = HYPERFINE INTERACTIONS,
    Year = 2002,
    Volume = 139,
    Number = 1-4,
    Pages = 597-606,
    Note = 5th International Symposium on the Industrial Applications of the
       Mossbauer Effect, VIRGINIA BEACH, VIRGINIA, AUG 13-18, 2000,
    Organization = Condensed Matter \& Mat Phys Res Grp,
    Abstract = The thermally induced solid-state syntheses of gamma-Fe2O3 nanoparticles
       from iron-bearing materials (FeSO4, Fe-2(C2O4)(3) and almandine garnet)
       are described. Magnetic properties, particles size and the mechanism of
       the structural change of gamma-Fe2O3 nanoparticles have been
       investigated using Fe-57 Mossbauer spectroscopy, X-ray powder
       diffraction (XRD) and atomic force microscopy (AFM). gamma-Fe2O3
       nanoparticles are transformed into hematite via epsilon-Fe2O3 as the
       intermediate.,
    DOI = 10.1023/A:1021226929237,
    ISSN = 0304-3843,
    Unique-ID = ISI:000179497300066,
    

2001

  • [DOI] M. Malon, Z. Travnicek, M. Marysko, R. Zboril, M. Maslan, J. Marek, K. Dolezal, J. Rolcik, V. Krystof, and M. Strnad, "Metal complexes as anticancer agents 2. Iron(III) and copper(II)
    bio-active complexes with N-6-benzylaminopurine derivatives," INORGANICA CHIMICA ACTA, vol. 323, iss. 1-2, pp. 119-129, 2001.
    [Bibtex]
    @article ISI:000172077100015,
    Author = Malon, M and Travnicek, Z and Marysko, M and Zboril, R and Maslan, M and
       Marek, J and Dolezal, K and Rolcik, J and Krystof, V and Strnad, M,
    Title = Metal complexes as anticancer agents 2. Iron(III) and copper(II)
       bio-active complexes with N-6-benzylaminopurine derivatives,
    Journal = INORGANICA CHIMICA ACTA,
    Year = 2001,
    Volume = 323,
    Number = 1-2,
    Pages = 119-129,
    Month = OCT 29,
    Abstract = Iron(III) complexes with
       2-(3-hydroxypropylamino)-6-benzylaniino-9-isopropylpurine (Bohemin,
       HL1), in its protonized form, of the composition (H+HL1)(2)[FeCl5].
       2H(2)O (1), (H+HL1)(2)[FeCl5]. 3H(2)O (2) have been prepared by two
       different routes. A new way for synthesis of copper(II) complex with
       6-(2-chlorobenzylamino)purine (HL2), [Cu-2(mu -Cl)(2)(mu
       -HL2)(2)(HL2)(2)Cl-2]. 2H(2)O (3), together with the preparation of
       copper(II) complex with 6-(3-chlorobenzylamino)purine (HL3), [Cu-2(mu
       -Cl)(2)(mu -HL3)(2)Cl-2] (4), is also reported. The characterization
       have been based on elemental analysis, electronic, infrared, ES + mass
       and Fe-57 Mossbauer spectra, conductivity data and magnetic
       susceptibility temperature measurements over the 4.5-300 K for 1-3, and
       35-300 K for 4. temperature range, respectively. Molecular structure of
       an electroneutral form of the HL2 ligand, (HL2. 2H(2)O), and a
       protonized form of the HL3 ligand, (H+HL3-Cl), have been determined by a
       single-crystal X-ray analysis. A mononuclear trigonal-bipyramidal (for 1
       and 2), binuclear octahedral (for 3) and binuclear trigonal-bipyramidal
       (for 4) structures of the complexes were proposed mainly on the basis of
       spectral and magnetic properties. An S = 3/2-5/2 spin-admixed state in 1
       and 2 was found to be related to the presence of [FeCl5](2-) (S = 3/2)
       and [FeCl5(H2O)](2-) (S = 5/2) complex anions in I and 2, as found by
       Fe-57 Mossbauer spectroscopy. Cytotoxic activity of the complexes was
       determined by a calcein AM assay and IC50 values were also estimated.
       For testing, human malignant melanoma cell line G-361. human osteogenic
       sarcoma cell line HOS, human chronic myelogenous leukaemia K-562 and
       human breast adenocarcinoma cell line MCF7 were used. The inhibition of
       p34(cdc2) kinase by the complexes I and 2, which is known to be one of
       the important mechanisms responsible for cytotoxicity of
       cytokinin-derived compounds, was also studied. (C) 2001 Elsevier Science
       B.V. All rights reserved.,
    DOI = 10.1016/S0020-1693(01)00611-9,
    ISSN = 0020-1693,
    Unique-ID = ISI:000172077100015,
    
  • [DOI] R. Zboril, M. Mashlan, and D. Krausova, "Mechanism of solid-state oxidation of FeSO(4)center dot H(2)O: model of
    simultaneous reactions," CZECHOSLOVAK JOURNAL OF PHYSICS, vol. 51, iss. 7, pp. 719-726, 2001.
    [Bibtex]
    @article ISI:000170360600009,
    Author = Zboril, R and Mashlan, M and Krausova, D,
    Title = Mechanism of solid-state oxidation of FeSO(4)center dot H(2)O: model of
       simultaneous reactions,
    Journal = CZECHOSLOVAK JOURNAL OF PHYSICS,
    Year = 2001,
    Volume = 51,
    Number = 7,
    Pages = 719-726,
    Month = JUL,
    Note = International Colloquium on Mossbauer Spectroscopy in Materials Science,
       VELKE LOSINY, CZECH REPUBLIC, SEP 03-08, 2000,
    Organization = Palacky Univ, Fac Sci, Dept Expt Phys; Acad Sci Czech Republ, Inst Phys
       Mat,
    Abstract = The mechanism of the thermal transformation of FeSO(4).H(2)O in air has
       been studied under isothermal conditions at temperatures
       (150-460)degreesC using mainly (57)Fe Mossbauer spectroscopy and X-ray
       powder diffraction (XRD). Two trends are typical for the thermal
       behaviour of FeSO(4).H(2)O in air, a tendency toward oxidation and
       dehydration. We suggested a new transformation model consisting of two
       ways of oxidation, direct one and indirect one. Fe(OH)SO(4) was
       identified as a product of the direct way, Fe(2)(SO(4))(3) and
       superparamagnetic: nanoparticles of gamma -Fe(2)O(3) as products of the
       indirect way. The suggested model of simultaneous reactions explains the
       unusual non-monotonous dependence of the oxidation level of the
       thermally treated samples on temperature.,
    DOI = 10.1023/A:1017610218372,
    ISSN = 0011-4626,
    Unique-ID = ISI:000170360600009,
    
  • [DOI] K. Barcova, M. Mashlan, R. Zboril, P. Martinec, and P. Kula, "Thermal decomposition of almandine garnet: Mossbauer study," CZECHOSLOVAK JOURNAL OF PHYSICS, vol. 51, iss. 7, pp. 749-754, 2001.
    [Bibtex]
    @article ISI:000170360600013,
    Author = Barcova, K and Mashlan, M and Zboril, R and Martinec, P and Kula, P,
    Title = Thermal decomposition of almandine garnet: Mossbauer study,
    Journal = CZECHOSLOVAK JOURNAL OF PHYSICS,
    Year = 2001,
    Volume = 51,
    Number = 7,
    Pages = 749-754,
    Month = JUL,
    Note = International Colloquium on Mossbauer Spectroscopy in Materials Science,
       VELKE LOSINY, CZECH REPUBLIC, SEP 03-08, 2000,
    Organization = Palacky Univ, Fac Sci, Dept Expt Phys; Acad Sci Czech Republ, Inst Phys
       Mat,
    Abstract = The thermal decomposition of almandine garnet from Zoltye Vody, Ukraine,
       has been studied using (57)Fe Mossbauer spectroscopy. Room temperature
       Mossbauer spectrum of the initial powdered sample is characterised by
       one doublet corresponding to Fe(2+) in dodecahedral position 24c. In the
       room temperature spectra of all heated almandine samples, a doublet
       corresponding to gamma -Fe(2)O(3) nanoparticles appeared. Depending on
       experimental conditions (heating temperature and time), the additional
       spectral lines of alpha -Fe(2)O(3) and epsilon -Fe(2)O(3) were observed
       in Mossbauer spectra.
       It is obvious that the thermal transformation of almandine garnet in air
       is related to the primary formation of gamma -Fe(2)O(3)
       superparamagnetic nanoparticles. gamma -Fe(2)O(3) nanoparticles are
       transformed into epsilon -Fe(2)O(3) and consequently into alpha
       -Fe(2)O(3) at higher temperatures. The mechanism and kinetics of the
       individual structural transformations depend on experimental conditions
       - mainly on the heating temperature and size of the particles.,
    DOI = 10.1023/A:1017618420189,
    ISSN = 0011-4626,
    Unique-ID = ISI:000170360600013,
    

1999

  • R. Zboril, M. Mashlan, D. Krausova, and P. Pikal, "Cubic beta-Fe2O3 as the product of the thermal decomposition of
    Fe-2(SO4)(3)," HYPERFINE INTERACTIONS, vol. 121, iss. 1-8, pp. 497-501, 1999.
    [Bibtex]
    @article ISI:000082617800080,
    Author = Zboril, R and Mashlan, M and Krausova, D and Pikal, P,
    Title = Cubic beta-Fe2O3 as the product of the thermal decomposition of
       Fe-2(SO4)(3),
    Journal = HYPERFINE INTERACTIONS,
    Year = 1999,
    Volume = 121,
    Number = 1-8,
    Pages = 497-501,
    Note = 11th International Conference on Hyperfine Interactions, DURBAN, SOUTH
       AFRICA, AUG 23-28, 1998,
    Abstract = The thermal decomposition of Fe-2(SO4)(3) in air has been investigated
       using transmission Mossbauer spectroscopy, CEMS and X-ray powder
       diffraction. The hexagonal alpha-Fe2O3 and cubic beta-Fe2O3 with spinel
       structure have been identified as products of the decomposition. The
       influence of the Fe-2(SO4)(3) particle size on the yield of beta-Fe2O3
       in the final product is pointed out and discussed. The size of particles
       and the calcination temperature are the most important kinetic factors
       determining the phase composition (beta-Fe2O3/alpha-Fe2O3) of iron (III)
       oxide.,
    ISSN = 0304-3843,
    Unique-ID = ISI:000082617800080,
    
  • R. Zboril, M. Mashlan, and D. Krausova, "The mechanism of beta-Fe2O3 formation by solid-state reaction between
    NaCl and Fe-2(SO4)(3)," in MOSSBAUER SPECTROSCOPY IN MATERIALS SCIENCE, 1999, pp. 49-56.
    [Bibtex]
    @inproceedings ISI:000081412500005,
    Author = Zboril, R and Mashlan, M and Krausova, D,
    Editor = Miglierini, M and Petridis, D,
    Title = The mechanism of beta-Fe2O3 formation by solid-state reaction between
       NaCl and Fe-2(SO4)(3),
    Booktitle = MOSSBAUER SPECTROSCOPY IN MATERIALS SCIENCE,
    Series = NATO ADVANCED SCIENCE INSTITUTE SERIES, SUB-SERIES 3, HIGH TECHNOLOGY,
    Year = 1999,
    Volume = 66,
    Pages = 49-56,
    Note = Conference of the NATO Advanced Research Workshop on Mossbauer
       Spectroscopy in Materials Science, SENEC, SLOVAKIA, SEP 06-11, 1998,
    Organization = NATO Sci Comm,
    Abstract = Mossbauer spectroscopy, x-ray powder diffraction, thermal analysis and
       elemental analysis were used for the study of the mechanism of reaction
       between NaCl and Fe-2(SO4)(3) in the oxidizing atmosphere (air). It was
       found that the reaction starts at 400 degrees C in isothermal conditions
       and is accompanied by the liberation of Cl-2. The initial reaction
       proceeds in the molar ratio of NaCl:Fe-2(SO4)(3)=3:1. beta-Fe2O3,
       NaFe(SO4)(2), Na3Fe(SO4)(3) and Na(2)So(4) were identified as solid
       products of the initial reaction. At the second stage both the double
       sulfates were transformed into beta-Fe2O3 and Na2SO4, the gaseous SO3
       was liberated simultaneously. Thermally less stable NaFe(SO4)(2)
       decomposes before Na3Fe(SO4)(3). The hexagonal alpha-Fe2O3 is formed in
       this process only as the product of the structural transformation of
       beta-Fe2O3. This beta-alpha transformation accompanies both the initial
       reaction and the secondary conversions of the intermediates. The
       Mossbauer parameters of the reaction products are enlisted.,
    ISBN = 0-7923-5640-3,
    Unique-ID = ISI:000081412500005,
    

1997

  • [DOI] R. Zboril, F. Grambal, D. Krausova, and M. Maslan, "Mossbauer study of thermal conversion of FeSO4 center dot 7H(2)O," CZECHOSLOVAK JOURNAL OF PHYSICS, vol. 47, iss. 5, pp. 565-569, 1997.
    [Bibtex]
    @article ISI:A1997XC91900014,
    Author = Zboril, R and Grambal, F and Krausova, D and Maslan, M,
    Title = Mossbauer study of thermal conversion of FeSO4 center dot 7H(2)O,
    Journal = CZECHOSLOVAK JOURNAL OF PHYSICS,
    Year = 1997,
    Volume = 47,
    Number = 5,
    Pages = 565-569,
    Month = MAY,
    Note = International Colloquium on Mossbauer Spectroscopy in Materials Science
       (MSMS96), LEDNICE, CZECH REPUBLIC, SEP, 1996,
    Abstract = The aim of this study was to identify intermediary products and study of
       the oxidation level of FeSO4 . 7H(2)O in the temperature region from 200
       to 600 degrees C. The knowledge of the reaction process in this
       temperature region is important for the optimisation of the technology
       used in the red pigment manufacture.,
    DOI = 10.1023/A:1021219709276,
    ISSN = 0011-4626,
    Unique-ID = ISI:A1997XC91900014,