Anna Kuzminova
Charles University in Prague
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Featured researches published by Anna Kuzminova.
Functional Materials Letters | 2017
Ondřej Kylián; Jiří Kratochvíl; Martin Petr; Anna Kuzminova; Danka Slavínská; Hynek Biederman; Jana Beranová
Silver-based nanomaterials that exhibit antibacterial character are intensively studied as they represent promising weapon against multi-drug resistant bacteria. Equally important class of materials represent coatings that have highly water repellent nature. Such materials may be used for fabrication of anti-fogging or self-cleaning surfaces. The aim of this study is to combine both of these valuable material characteristics. Antibacterial and highly hydrophobic Ag/C:F nanocomposite films were fabricated by means of gas aggregation source of Ag nanoparticles and sputter deposition of C:F matrix. The nanocomposite coatings had three-layer structure C:F base layer/Ag nanoparticles/C:F top layer. It is shown that the increasing number of Ag nanoparticles in produced coatings leads not only in enhancement of their antibacterial activity, but also causes substantial increase of their hydrophobicity. Under optimized conditions, the coatings are super-hydrophobic with water contact angle equal to 165∘ and are ca...
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2018
Martin Šubr; Anna Kuzminova; Ondřej Kylián; Marek Procházka
Optimization of surface-enhanced Raman scattering (SERS)-based sensors for (bio)analytical applications has received much attention in recent years. For optimum sensitivity, both the nanostructure fabrication process and the choice of the excitation wavelength used with respect to the specific analyte studied are of crucial importance. In this contribution, detailed SERS intensity profiles were measured using gradient nanostructures with the localized surface-plasmon resonance (LSPR) condition varying across the sample length and using riboflavin as the model biomolecule. Three different excitation wavelengths (633 nm, 515 nm and 488 nm) corresponding to non-resonance, pre-resonance and resonance excitation with respect to the studied molecule, respectively, were tested. Results were interpreted in terms of a superposition of the enhancement provided by the electromagnetic mechanism and intrinsic properties of the SERS probe molecule. The first effect was dictated mainly by the degree of spectral overlap between the LSPR band, the excitation wavelength along with the scattering cross-section of the nanostructures, while the latter was influenced by the position of the molecular resonance with respect to the excitation wavelength. Our experimental findings contribute to a better understanding of the SERS enhancement mechanism.
Beilstein Journal of Nanotechnology | 2017
Andrei Choukourov; Pavel Pleskunov; Daniil Nikitin; Valerii Titov; Artem Shelemin; Mykhailo Vaidulych; Anna Kuzminova; Pavel Solař; Jan Hanuš; Jaroslav Kousal; Ondřej Kylián; Danka Slavínská; Hynek Biederman
This contribution reviews plasma polymer nanoparticles produced by gas aggregation cluster sources either via plasma polymerization of volatile monomers or via radio frequency (RF) magnetron sputtering of conventional polymers. The formation of hydrocarbon, fluorocarbon, silicon- and nitrogen-containing plasma polymer nanoparticles as well as core@shell nanoparticles based on plasma polymers is discussed with a focus on the development of novel nanostructured surfaces.
The Journal of Antibiotics | 2018
Jiří Kratochvíl; Anna Kuzminova; Ondřej Kylián
Urgent need for innovative and effective antibacterial coatings in different fields seems to have triggered the development of numerous strategies for the production of such materials. As shown in this short overview, plasma based techniques arouse considerable attention that is connected with the possibility to use these techniques for the production of advanced antibacterial Ag/plasma polymer coatings with tailor-made functional properties. In addition, the plasma-based deposition is believed to be well-suited for the production of novel multi-functional or stimuli-responsive antibacterial films.
Beilstein Journal of Nanotechnology | 2018
Vladimir Popok; Cesarino M. Jeppesen; Peter Fojan; Anna Kuzminova; Jan Hanuš; Ondřej Kylián
Background: Antibacterial materials are of high importance for medicine, and for the production and conservation of food. Among these materials, polymer films with metal nanoparticles (NPs) are of considerable interest for many practical applications. Results: The paper describes a novel approach for the formation of bactericidal polymer thin films (polystyrene in this case), produced by spin-coating, with Ti and Cu NPs deposited from cluster beams. Ti NPs are treated in three different ways in order to study different approaches for oxidation and, thus, efficiency in formation of the particles with semiconducting properties required for the catalytic formation of reactive oxygen species. Cu NPs are used as deposited. Partial NP embedding into polystyrene is realised in a controllable manner using thermal annealing in order to improve surface adhesion and make the particles resistant against wash-out. The formed composite films with TiOx and Cu species are tested as bactericidal media using E.coli bacteria as model microorganisms. Conclusion: The obtained results show considerable efficiency in destroying the bacteria and a good possibility of multiple re-use of the same composite films making the suggested approach attractive for the cases requiring reusable polymer-based antibacterial media.
Vacuum | 2014
Anna Kuzminova; Artem Shelemin; Ondřej Kylián; Martin Petr; Jiří Kratochvíl; Pavel Solař; Hynek Biederman
Applied Surface Science | 2015
Anna Kuzminova; Marta Vandrovcová; Artem Shelemin; Ondřej Kylián; Andrei Choukourov; Jan Hanuš; Lucie Bacakova; Danka Slavínská; Hynek Biederman
Surface & Coatings Technology | 2016
Anna Kuzminova; Jana Beranová; Oleksandr Polonskyi; Artem Shelemin; Ondřej Kylián; Andrei Choukourov; Danka Slavínská; Hynek Biederman
Plasma Processes and Polymers | 2016
Martin Petr; Ondřej Kylián; Jan Hanuš; Anna Kuzminova; Mykhailo Vaidulych; Ivan Khalakhan; Andrei Choukourov; Danka Slavínská; Hynek Biederman
Surface & Coatings Technology | 2015
Jiří Kratochvíl; Anna Kuzminova; Ondřej Kylián; Hynek Biederman