Home > Pracovníci > Doc. RNDr. Libor Kvítek, CSc.

Doc. RNDr. Libor Kvítek, CSc.

Email: libor.kvitek@upol.cz
Adresa: Svobody 8, 771 46 Olomouc
Tel: (+420) 58 563 4420
Fax: (+420) 58 563 4761

Tady bude neviditelný text – prázdná mezera

Tady bude neviditelný text – prázdná mezera

Tady bude neviditelný text – prázdná mezera

Oblast výzkumu:
Vědecko-výzkumná činnost v oblasti studia heterogenních soustav – povrchová energie a smáčivost tuhých povrchů, viskozita a povrchové napětí kapalin a roztoků, studium roztoků povrchově aktivních látek a jejich micel, elektrochemie homogenních a heterogenních soustav; jako hlavní zaměření pak studium přípravy, vlastností a aplikačních možností nanočástic stříbra a dlaších, zejména ušlechtilých kovů.

Zkušenosti ze zahraničních pracovišť:
1988 ICHF AV SSSR v Moskvě; počítačem řízená syntéza AgHal
2006 Univerzita Mateja Belu v Banskej Bystrici, Fakulta prírodných vied, Katedra chémie; nelineární kinetika chemických reakcí

10 nejlepších publikací za posledních 8 let:
1)  Kvítek L., Vaníčková M., Panáček A., Soukupová J., Dittrich M., Valentová E., Prucek R., Bancířová M., Milde D., Zbořil R.: Initial Study on the Toxicity of Silver Nanoparticles (NPs) against Paramecium caudatum. J. Phys. Chem. C, 113, 4296-4300 (2009).
2) Panáček A., Kolář M., Večeřová R., Prucek R., Soukupová J., Kryštof V., Hamal P., Zbořil R., Kvítek L.: Antifungal activity of silver nanoparticles against Candida spp. Biomaterials, 30, 6333-6340 (2009).
3) Prucek R., Kvítek L., Panáček A., et al. Polyacrylate-assisted synthesis of stable copper nanoparticles and copper(I) oxide nanocubes with high catalytic efficiency. J. Mat. Chem., 19, 8463-8469 (2009).
4) Kvítek L., Soukupová J.: Comment on ‘Preparation and antibacterial activity of Fe3O4@ Ag nanoparticles’. Nanotechnology, 20 (2009). DOI: 10.1088/0957-4484/20/2/028001
5) Kvítek L., Panáček A., Soukupová J., Kolář M., Večeřová R., Prucek R., Holecová M., Zbořil R.: Effect of Surfactants and Polymers on Stability and Antibacterial Activity of Silver Nanoparticles (NPs). J. Phys. Chem. C, 112, 5825-5834 (2008).
6) Soukupová J., Kvítek L., Panáček A., Nevěčná T., Zbořil R.: Comprehensive study on surfactant role on silver nanoparticles (NPs) prepared via modified Tollens process. Mat. Chem. Phys., 111, 77-81 (2008).
7) Panáček A., Kvítek L., Prucek R., Kolář M., Večeřová R., Pizúrová N., Sharma V. K., Nevěčná T., Zbořil R.: Silver Colloid Nanoparticles: Synthesis, Characterization, and Their Antibacterial Activity. J. Phys. Chem. B, 110, 16248-16253 (2006).
8) Kvítek L., Prucek R., Panáček A., et al. The influence of complexing agent concentration on particle size in the process of SERS active silver colloid synthesis. J. Mat. Chem., 15, 1099-1105 (2005).
9) Mrkvová K., Kameníček J., Šindelář Z., Kvítek L.: Synthesis, properties and crystal structures of R[M-III(bdt)(2)] complexes (M = Ni, Co, Cu). Transition Met. Chem., 29, 238-244 (2004).
10) Kopel P., Travnicek Z., Kvitek L., et al. Synthesis and characterization of Cu(II), Co(II) and Ni(II) complexes of trithiocyanuric acid: The structure of {N,N ‘-bis(3-aminopropyl)-1,3-propane-diamine}-(trithiocyanurato)nickel(II). J. Coord. Chem., 56, 1-11 (2003).

Prezentace výsledků na národních a mezinárodních konferencích:
28 přednášek (1 zvaná) a 76 posterů publikovaných na mezinárodních a národních vědeckých konferencích.

Ukázat publikace

Publikace

2011

  • [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] L. Kvitek and J. Hrbac, „Comment on „From Nanoparticles to Nanoplates: Preferential Oriented
    Connection of Ag Colloids during Electrophoretic Deposition“,“ JOURNAL OF PHYSICAL CHEMISTRY C, vol. 115, iss. 11, pp. 4980-4981, 2011.
    [Bibtex] 
    @article ISI:000288401200082,
Author = Kvitek, Libor and Hrbac, Jan,
Title = Comment on ``From Nanoparticles to Nanoplates: Preferential Oriented
   Connection of Ag Colloids during Electrophoretic Deposition'',
Journal = JOURNAL OF PHYSICAL CHEMISTRY C,
Year = 2011,
Volume = 115,
Number = 11,
Pages = 4980-4981,
Month = MAR 24,
DOI = 10.1021/jp1061144,
ISSN = 1932-7447,
Unique-ID = ISI:000288401200082,
  • [DOI] R. Prucek, A. Panacek, J. Soukupova, R. Novotny, and L. Kvitek, „Reproducible synthesis of silver colloidal particles tailored for
    application in near-infrared surface-enhanced Raman spectroscopy,“ JOURNAL OF MATERIALS CHEMISTRY, vol. 21, iss. 17, pp. 6416-6420, 2011.
    [Bibtex] 
    @article ISI:000289524300045,
Author = Prucek, Robert and Panacek, Ales and Soukupova, Jana and Novotny, Radko
   and Kvitek, Libor,
Title = Reproducible synthesis of silver colloidal particles tailored for
   application in near-infrared surface-enhanced Raman spectroscopy,
Journal = JOURNAL OF MATERIALS CHEMISTRY,
Year = 2011,
Volume = 21,
Number = 17,
Pages = 6416-6420,
Abstract = Reproducible synthesis of silver colloidal particles, with diameters of
   hundreds of nanometres, represents an experimentally rather difficult
   task although they have revealed a great application potential in e. g.
   SERS. The newly developed method, based on the reduction of the complex
   anion [Ag(SO(3))(2)](3-), offers an approach enabling to manage the
   preparation of silver particles with adjustable average diameters in the
   interval from 200 nm up to 700 nm due to the choice of the reducing
   agent and the sulfite concentration. These particles proved their
   efficiency as substrates for surface enhanced Raman spectroscopy with
   the excitation in the near infrared region (lambda = 1064 nm) and
   therefore this newly developed method confirmed the expected application
   potential.,
DOI = 10.1039/c0jm03870a,
ISSN = 0959-9428,
Unique-ID = ISI:000289524300045,
  • [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,

2010

  • [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,
  • M. Vanickova, J. Soukupova, and L. Kvitek, „Nanotechnology in Teaching Natural Science,“ CHEMICKE LISTY, vol. 104, iss. 10, pp. 945-949, 2010.
    [Bibtex] 
    @article ISI:000283622500008,
Author = Vanickova, Marketa and Soukupova, Jana and Kvitek, Libor,
Title = Nanotechnology in Teaching Natural Science,
Journal = CHEMICKE LISTY,
Year = 2010,
Volume = 104,
Number = 10,
Pages = 945-949,
Abstract = Nanomaterials are now produced in large quantities due to their useful
   properties different from other materials. Possible toxicity of
   nanomaterials is currently addressed and discussed. Using a modified
   Tollens process, an aqueous dispersion of Ag nanoparticles was prepared,
   on which their unique properties and changes of material characteristics
   when approaching nano dimensions can be demonstrated. Also, experiments
   regarding toxicity of nanoparticles were proposed. Toxicity of the
   nanoparticles was tested on Paramecium caudatum. Following the
   instruction, the students discover that the prepared Ag nanoparticles
   are much less toxic than ionic Ag. The proposed experiments bring
   interdisciplinary chemical, physical, and biological findings and
   knowledge.,
ISSN = 0009-2770,
Unique-ID = ISI:000283622500008,

2009

  • [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] 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] L. Kvitek and J. Soukupova, „Comment on `Preparation and antibacterial activity of Fe(3)O(4)@ Ag
    nanoparticles’,“ NANOTECHNOLOGY, vol. 20, iss. 2, 2009.
    [Bibtex] 
    @article ISI:000261647500024,
Author = Kvitek, Libor and Soukupova, Jana,
Title = Comment on `Preparation and antibacterial activity of Fe(3)O(4)@ Ag
   nanoparticles',
Journal = NANOTECHNOLOGY,
Year = 2009,
Volume = 20,
Number = 2,
Month = JAN 14,
Abstract = The fabrication of nanocomposite materials with a metal-oxide@
   nobel-metal structure represents a challenge both from the theoretical
   and experimental points of view. This challenge is connected with a
   complicated mechanism of formation of these nanocomposite materials. In
   the paper by Gong et al (2007 Nanotechnology 18 285604), the authors
   tried to solve this problem but the suggested mechanism is rather
   improbable. This improbability derived from the found discrepancy in the
   material balance of reactants/ products. Therefore this comment is
   devoted to evaluation of this discrepancy of the Fe(3)O(4)@ Ag
   nanoparticle preparation and suggestion of another possible mechanism.,
DOI = 10.1088/0957-4484/20/2/028001,
Article-Number = 028001,
ISSN = 0957-4484,
Unique-ID = ISI:000261647500024,
  • [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,
  • H. Strnadova and L. Kvitek, „The Influence of Buffer on Self-Assembling Properties of Micelles,“ CHEMICKE LISTY, vol. 103, iss. 4, pp. 315-319, 2009.
    [Bibtex] 
    @article ISI:000265518100010,
Author = Strnadova, Hana and Kvitek, Libor,
Title = The Influence of Buffer on Self-Assembling Properties of Micelles,
Journal = CHEMICKE LISTY,
Year = 2009,
Volume = 103,
Number = 4,
Pages = 315-319,
Abstract = The values of CMC (critical micellar concentration) for buffered
   surfactant solutions used in separation methods in analytical chemistry,
   especially in micellar electrokinetic capillary chromatography, were
   studied by conductivity, surface tension and viscosity measurements. The
   study involved solutions of representative anionic (SDS), cationic
   (CTAB), and non-ionic (TX100, GX080) surfactants. The data measured for
   aqueous Solutions were in good agreement with the published data. The
   data for buffer solutions confirmed theoretical presumptions - the CMC
   values decreased with increasing ionic strength of the solutions. In
   contrast, viscoelastic properties of the solutions of surfactants were
   not significantly influenced by the ionic strength or pH of the
   solutions.,
ISSN = 0009-2770,
Unique-ID = ISI:000265518100010,

2008

  • [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] 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,

2006

  • [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,

2005

  • A. Panacek and L. Kvitek, „Colloid chemistry in laboratory practice,“ CHEMICKE LISTY, vol. 99, iss. 8, pp. 606-609, 2005.
    [Bibtex] 
    @article ISI:000231377100009,
Author = Panacek, A and Kvitek, L,
Title = Colloid chemistry in laboratory practice,
Journal = CHEMICKE LISTY,
Year = 2005,
Volume = 99,
Number = 8,
Pages = 606-609,
Abstract = The aim of the article is to supply a current missing field of chemistry
   in grammar schools by project of simple practical problems from coloid
   chemistry. It contains teoretical part and practical problems focusing
   on physical and chemical properties of colloid chemistry.,
ISSN = 0009-2770,
Unique-ID = ISI:000231377100009,
  • [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,

2004

  • [DOI] K. Mrkvova, J. Kamenicek, Z. Sindelar, L. Kvitek, J. Mrozinski, M. Nahorska, and D. Zak, „Synthesis, properties and crystal structures of R[M-III(bdt)(2)]
    complexes (M = Ni, Co, Cu),“ TRANSITION METAL CHEMISTRY, vol. 29, iss. 3, pp. 238-244, 2004.
    [Bibtex] 
    @article ISI:000220303000002,
Author = Mrkvova, K and Kamenicek, J and Sindelar, Z and Kvitek, L and Mrozinski,
   J and Nahorska, M and Zak, D,
Title = Synthesis, properties and crystal structures of R[M-III(bdt)(2)]
   complexes (M = Ni, Co, Cu),
Journal = TRANSITION METAL CHEMISTRY,
Year = 2004,
Volume = 29,
Number = 3,
Pages = 238-244,
Month = APR,
Abstract = New nickel, cobalt and copper complexes with benzene- 1,2-dithiole
   (bdt), of general formula R[M(bdt)(2)]: M = Ni, Co and Cu; R = Me4N,
   Et4N, Pr4N, Me3PhN, MePh3P, Ph4P have been synthesized and characterized
   by standard physico-chemical methods (elemental analyses,
   magnetochemical and conductivity measurements, i. r. and u.v.- vis.
   spectroscopy). X-ray structural analysis of (MePh3P)[M(bdt)(2)], M =
   Ni, Co and Cu, confirms that the MS4 chromophore lies in a slightly
   distorted square coordination arrangement around the central atom. The
   three complexes have also been studied by cyclic voltammetry.,
DOI = 10.1023/B:TMCH.0000020349.69302.37,
ISSN = 0340-4285,
Unique-ID = ISI:000220303000002,
  • A. Panacek, L. Kvitek, and M. Kleckova, „Colloid chemistry in practical problems,“ CHEMICKE LISTY, vol. 98, iss. 1, pp. 39-41, 2004.
    [Bibtex] 
    @article ISI:000188806900008,
Author = Panacek, A and Kvitek, L and Kleckova, M,
Title = Colloid chemistry in practical problems,
Journal = CHEMICKE LISTY,
Year = 2004,
Volume = 98,
Number = 1,
Pages = 39-41,
Abstract = The aim of the article is giving an idea to secondary school
   schoolchildren of a neglected field of chemistry. It contains basic
   theoretical concepts from colloid chemistry and in particular
   instructions for practical problems of colloid chemistry. The problems
   are not time-, material- or tabour-consuming; they are focused on
   preparation of colloidal systems of inorganic materials and observation
   of their properties such as stability, stabilization and the Tyndall
   effect.,
ISSN = 0009-2770,
Unique-ID = ISI:000188806900008,

2003

  • [DOI] P. Kopel, Z. Travnicek, L. Kvitek, Z. Cernosek, G. Wrzeszcz, and J. Marek, „Synthesis and characterization of Cu(II), Co(II) and Ni(II) complexes of
    trithiocyanuric acid: The structure of \N,N
    `-bis(3-aminopropyl)-1,3-propane-diamine\-(trithiocyanurato)nickel(II),“ JOURNAL OF COORDINATION CHEMISTRY, vol. 56, iss. 1, pp. 1-11, 2003.
    [Bibtex] 
    @article ISI:000181343900001,
Author = Kopel, P and Travnicek, Z and Kvitek, L and Cernosek, Z and Wrzeszcz, G
   and Marek, J,
Title = Synthesis and characterization of Cu(II), Co(II) and Ni(II) complexes of
   trithiocyanuric acid: The structure of \N,N
   `-bis(3-aminopropyl)-1,3-propane-diamine\-(trithiocyanurato)nickel(II),
Journal = JOURNAL OF COORDINATION CHEMISTRY,
Year = 2003,
Volume = 56,
Number = 1,
Pages = 1-11,
Month = JAN 10,
Abstract = Copper, cobalt and nickel complexes with nitrogen donor ligands and
   trithiocyanurate dianion (ttcH(2-)) have been prepared and characterized
   by elemental analysis, electronic and EPR (copper complexes) spectra,
   and magnetic susceptibility measurements over the temperature range
   78-291 K. Some of the complexes have also been studied by thermal
   analysis and by cycle voltammetry. Structures of the complexes have been
   proposed on the basis of magnetic and spectral properties. Two copper
   complexes of compositions Cu(bpy)(ttcH) and Cu(phen)(ttcH), where
   bpy=2,2'-bipyridine, phen=1,10-phenanthroline, are probably polymeric,
   whereas the copper complex with N,N-bis(3-aminopropyl)ethylenediamine
   (bapen) of composition [Cu(bapen)ttcH)](.)2H(2)O is mononuclear. We
   assume distorted octahedral structures for nickel complexes, A single
   crystal X-ray analysis of [Ni(bappn)(ttcH)](.)5H(2)O shows that the
   central nickel atom is coordinated by tetradentate nitrogen ligand
   N,N'-bis(3-aminopropyl)-1,3-propanediamine and coordination is completed
   by sulfur and nitrogen atoms of trithiocyanurate dianion.,
DOI = 10.1080/0095897021000039034,
ISSN = 0095-8972,
Unique-ID = ISI:000181343900001,

2001

  • [DOI] P. Kopel, Z. Travnicek, L. Kvitek, M. Biler, M. Pavlicek, Z. Sindelar, and J. Marek, „Coordination compounds of nickel with trithiocyanuric acid. Part IV.
    Structure of [Ni(pmdien)(ttcH)] (pmdien = N,N,N `,N `,N
    `’-pentamethyldiethylenetriamine, ttcH(3) = trithiocyanuric acid),“ TRANSITION METAL CHEMISTRY, vol. 26, iss. 3, pp. 282-286, 2001.
    [Bibtex] 
    @article ISI:000167436200007,
Author = Kopel, P and Travnicek, Z and Kvitek, L and Biler, M and Pavlicek, M and
   Sindelar, Z and Marek, J,
Title = Coordination compounds of nickel with trithiocyanuric acid. Part IV.
   Structure of [Ni(pmdien)(ttcH)] (pmdien = N,N,N `,N `,N
   `'-pentamethyldiethylenetriamine, ttcH(3) = trithiocyanuric acid),
Journal = TRANSITION METAL CHEMISTRY,
Year = 2001,
Volume = 26,
Number = 3,
Pages = 282-286,
Month = JUN,
Abstract = Ni-II mixed-ligand complexes of compositions [Ni(pmdien)(ttcH)] (1),
   [Ni(baphen)(2)(ttcH)] . 4H(2)O (2), [Ni-(dpa)(ttcH)(H2O)] (3),
   [Ni(cyclam)(ttcH)] . 2H(2)O (4), [Ni(hexaa)](ttcH) (5) and
   [Ni(hexab)(ttcH)] . 2H(2)O (6), (baphen =
   4,7-diphenyl-1,10-phenanthroline, dpa = 2,2'-dipyridylamine, cyclam =
   1,4,8,11-tetraazacyclotetradecane, hexaa =
   1,3,6,9,11,14-hexaazatricyclo[12.2.1.1(6),9]-octadecane, hexab =
   1,8-dimethyl-1,3,6,8,10,13-hexaazacyclotetradecane) have been prepared
   and characterized by means of i.r., u.v.-vis. spectroscopies and
   magnetochemical measurements. The redox properties of the complexes were
   studied by cyclic voltammetry. The crystal and molecular structure of
   [Ni(pmdien)(ttcH)] was determined. The nickel atom is
   penta-coordinated by three N atoms of pmdien, and by S and N atoms of
   trithiocyanurate(2-) anion.,
DOI = 10.1023/A:1007129711379,
ISSN = 0340-4285,
Unique-ID = ISI:000167436200007,

2000

  • [DOI] V. Machala, Z. Travnicek, Z. Sindelar, L. Kvitek, and J. Marek, „Nitrogen-donor base adducts of bis(O,O
    `-di-isoamyldithiophosphato)nickel(II),“ TRANSITION METAL CHEMISTRY, vol. 25, iss. 6, pp. 715-719, 2000.
    [Bibtex] 
    @article ISI:000089150700022,
Author = Machala, V and Travnicek, Z and Sindelar, Z and Kvitek, L and Marek, J,
Title = Nitrogen-donor base adducts of bis(O,O
   `-di-isoamyldithiophosphato)nickel(II),
Journal = TRANSITION METAL CHEMISTRY,
Year = 2000,
Volume = 25,
Number = 6,
Pages = 715-719,
Month = DEC,
Abstract = A series of Ni-II complexes with the O,O'-di-isoamylester of
   dithiophosphoric acid and nitrogen-donor ligands of composition
   [Ni(i-Am(2)dtp)(2)(L)]; [dtp = O2PS2-; L = 2,2'-bipyridine (bpy);
   1,10-phenanthroline (phen); 5-nitro-1,10-phenanthroline (nphen);
   4,7-diphenyl-1,10-phenanthroline (baphen);
   2,9-dimethyl-1,10-phenanthroline (neo), 2-aminomethylpyridine (amp),
   2-(2-aminoethyl)pyridine (aep), 2,2'-dipiridylamine (dpa),
   1,2-diaminopropane (1,2-dap) or trans 1,2-diaminocyclohexane (dch)] have
   been prepared. The compounds have been characterized by elemental
   analyses (C,H,N,S), electronic and i.r. spectroscopy, magnetic and
   conductivity measurements and by cyclic voltammetry. The results show
   that all complexes behave as non-electrolytes in acetone. Electronic
   spectra and magnetic moments suggest a distorted cis-octahedral geometry
   around the Ni-II atom [mu(eff)/mu(B) is an element of < 3.10, 3.40 >],
   except for [Ni(i-Am(2)dtp)(2)(aep)], where the measured temperature
   dependence of the magnetic susceptibility proved the tetrahedrally
   coordinated nickel [4.06 mu(eff)/mu(B) (298 K) - 3.20 mu(eff)/mu(B)
   (80 K)]. In the [Ni(i-Am(2)dtp)(2)(neo)] complex, the nickel atom is
   penta-coordinated. The X-ray crystal and molecular structure of
   [Ni(i-Am(2)dtp)(2)(1,2-dap)] has been determined.,
DOI = 10.1023/A:1007016617249,
ISSN = 0340-4285,
Unique-ID = ISI:000089150700022,

1999

  • [DOI] Z. Travnicek, J. Walla, L. Kvitek, Z. Sindelar, and M. Biler, „Xanthate complexes of nickel with nitrogen donor ligands. Part V,“ TRANSITION METAL CHEMISTRY, vol. 24, iss. 6, pp. 633-637, 1999.
    [Bibtex] 
    @article ISI:000083275300004,
Author = Travnicek, Z and Walla, J and Kvitek, L and Sindelar, Z and Biler, M,
Title = Xanthate complexes of nickel with nitrogen donor ligands. Part V,
Journal = TRANSITION METAL CHEMISTRY,
Year = 1999,
Volume = 24,
Number = 6,
Pages = 633-637,
Month = DEC,
Abstract = Nickel(II) xanthate complexes of general formula, [Ni(Rxa)(2)(L)] [R
   = i-Pr, i-Am, xa = OCS2-, L = 4,7-diphenyl-1,10-phenanthroline(baphen),
   4,4'-dimethyl-2,2'-bipyridyl (me(2)bpy),
   2-9-dimethyl-1,10-phenanthroline(neo) or trans-1,2-diaminocyclohexane
   (dch)] and [Ni(Rxa)(cyclam)](Rxa) ( =
   1,4,8,11-tetraazacyclotetradecane) have been synthesized and
   characterized by elemental analyses, i.r. and electronic spectroscopy,
   magnetic and conductivity measurements. The complexes with cyclam were
   studied by cyclic voltammetry. Values of magnetic moments at room
   temperature lie within the 3.25-3.51 B.M. range and thus indicate the
   presence of two unpaired electrons, except for the complexes with
   cyclam, where the anomalous values of 1.76 and 1.74 B.M. were obtained
   in respect to the nickel(II) complexes. Magnetic susceptibility data for
   [Ni(i-Prxa)(cyclam)](i-Prxa) were measured over the 79-298 K range and
   indicate no exchange interaction between paramagnetic nickel(II)
   centres.,
DOI = 10.1023/A:1006923722773,
ISSN = 0340-4285,
Unique-ID = ISI:000083275300004,
  • [DOI] F. Brezina, Z. Sindelar, L. Kvitek, and R. Pastorek, „Synthesis and magnetic properties of dithiooxamide-bridged nickel(II)
    complexes,“ TRANSITION METAL CHEMISTRY, vol. 24, iss. 1, pp. 88-91, 1999.
    [Bibtex] 
    @article ISI:000080479500021,
Author = Brezina, F and Sindelar, Z and Kvitek, L and Pastorek, R,
Title = Synthesis and magnetic properties of dithiooxamide-bridged nickel(II)
   complexes,
Journal = TRANSITION METAL CHEMISTRY,
Year = 1999,
Volume = 24,
Number = 1,
Pages = 88-91,
Month = FEB,
Abstract = Two novel nickel(II) dinuclear complexes
   [Ni-2(cyclam)(2)(DTA)](ClO4)(2) (1) and [Ni-2(TAA)(2)(DTA)]
   (ClO4)(2) (2) (TAA = N(CH2CH2NH2)(3), cyclam =
   1,4,8,11-tetraazacyclotetradecane, DTA = dithiooxamide) have been
   prepared and studied by elemental analyses, i.r. and electronic spectra
   and magnetic measurements. The magnetic susceptibility temperature
   dependence was measured over the 77-300 K range and the observed data
   were successfully simulated by an equation based on the spin Hamiltonian
   operator (H = -2JS(1)S(2)) giving the exchange integral J = -23.09
   cm(-1) for (1) and J = -26.0 cm(-1) for (2).,
DOI = 10.1023/A:1006997924748,
ISSN = 0340-4285,
Unique-ID = ISI:000080479500021,
  • [DOI] P. Kopel, Z. Travnicek, L. Kvitek, R. Panchartkova, M. Biler, J. Marek, and M. Nadvornik, „Coordination compounds of nickel with trithiocyanuric acid – Part III.
    Crystal and molecular structure of [Ni(bapen)(ttcH)]center dot 2H(2)O
    (bapen=N,N `-bis(3-aminopropyl)ethylenediamine, ttcH(3) =
    trithiocyanuric acid),“ POLYHEDRON, vol. 18, iss. 12, pp. 1779-1784, 1999.
    [Bibtex] 
    @article ISI:000080990300010,
Author = Kopel, P and Travnicek, Z and Kvitek, L and Panchartkova, R and Biler, M
   and Marek, J and Nadvornik, M,
Title = Coordination compounds of nickel with trithiocyanuric acid - Part III.
   Crystal and molecular structure of [Ni(bapen)(ttcH)]center dot 2H(2)O
   (bapen=N,N `-bis(3-aminopropyl)ethylenediamine, ttcH(3) =
   trithiocyanuric acid),
Journal = POLYHEDRON,
Year = 1999,
Volume = 18,
Number = 12,
Pages = 1779-1784,
Abstract = Coordination compounds of compositions [Ni(bapen)(ttcH)] . 2H(2)O (1),
   [Ni(bappn)(ttcH)] (2), [Ni(mdpta)(ttcH)(H2O)] (3),
   [Ni(nphen)(2)(ttcH)] . H2O (4), [Ni(nphen)(3)](ttcH). 2H(2)O (5),
   [Ni(ampy)(2)(ttcH). H2O (6) and [Ni(aepy)(2)(ttcH)]. 2H(2)O (7),
   where bapen = N,N'-bis(3-aminopropyl)ethylenediamine, bappn = N,N'-bis(
   3-aminopropyl)-1,3-propanediamine, mdpta =
   3,3'-diamino-N-methyldipropylamine, nphen=5-nitro-1,10-phenanthroline,
   ampy = 2-aminomethylpyridine, aepy = 2-aminoethylpyridine and ttcH(3) =
   trithiocyanuric acid, have been prepared. The crystal and molecular
   structure of (1) was determined by X-ray analysis. Nickel atom is
   six-coordinated by four N atoms of amine and S and N donor atoms of
   trithiocyanuric dianion, whereas two water molecules are situated
   outside the coordination sphere. Cyclic voltammetry showed that the
   complexes undergo an oxidation attributable to Ni2+-->Ni3+ in the range
   550-950 mV. The magnetic behaviour of (6) and (7) has been studied in
   the 291-94 K temperature range. Magnetic susceptibility follows the
   Curie-Weiss law. (C) 1999 Elsevier Science Ltd. All rights reserved.,
DOI = 10.1016/S0277-5387(99)00053-4,
ISSN = 0277-5387,
Unique-ID = ISI:000080990300010,

1998

  • L. Kvitek, R. Novotny, and P. Pikal, „Size determination of inorganic particles by dynamic light scattering,“ CHEMICKE LISTY, vol. 92, iss. 5, pp. 431-433, 1998.
    [Bibtex] 
    @article ISI:000073838700007,
Author = Kvitek, L and Novotny, R and Pikal, P,
Title = Size determination of inorganic particles by dynamic light scattering,
Journal = CHEMICKE LISTY,
Year = 1998,
Volume = 92,
Number = 5,
Pages = 431-433,
Abstract = The size distributions of particles in aqueous dispersions of TiO2 and
   Fe2O3 determined by dynamic light scattering were compared with the size
   distributions obtained by electron microscopy and gravitation
   sedimentation. Very good accordance of these methods has been found for
   TiO2 whereas Fe2O3 showed significant deviations in the similar sets of
   values, probably due to a strong tendency to particle agglomeration.,
ISSN = 0009-2770,
Unique-ID = ISI:000073838700007,