Search results for: Martin Drábik

Items from 1 to 17 out of 17 results

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Influence of substrate material and its plasma pretreatment on adhesion and properties of WC/a-C:H nanocomposite coatings deposited at low temperature

Martin Drábik, Martin Truchlý, Vladimír Ballo, Tomáš Roch, more

Surface and Coatings Technology > 2018 > 333 > C > 138-147

WC/a-C:H tribological nanocomposite coatings were deposited by reactive magnetron sputtering of tungsten carbide targets in acetylene atmosphere on substrates of various materials – cemented carbide and three types of steel. All the substrates were pretreated by various magnetron plasma-based techniques to evaluate their efficiency in promotion of coating adhesion. All the studied processes took place...

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Influence of plasma pretreatment on the performance of industrial tungsten carbide coatings deposited at low temperature on 100Cr6 bearing steel substrates

Martin Drábik, Vladimír Ballo, Martin Truchlý, Juraj Frkáň, more

Surface and Coatings Technology > 2016 > 293 > C > 2-9

The study concerns different surface pretreatment procedures of the 100Cr6 bearing steel substrates using DC magnetron sputtering and high-power impulse magnetron sputtering. The influence of the pretreatment technique on structure, adhesion and overall performance of the deposited tungsten carbide tribological coatings is characterized. The substrate pretreatment and deposition processes are maintained...

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Deposition of Functional Plasma Polymers Influenced by Reactor Geometry in Capacitively Coupled Discharges

Dirk Hegemann, Miroslav Michlíček, Noémi E. Blanchard, Urs Schütz, more

Plasma Processes and Polymers > 13 > 2 > 279 - 286

The deposition of functional plasma polymers such as a‐C:H:O films is mainly influenced by fragmentation of the parent molecules in the gas phase as well as by the energetic conditions during film growth at the surface. The influence of gas phase and surface processes on the a‐C:H:O film properties was thus investigated in order to optimize cross‐linking and functional group density. The control of...

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Effect of various concentrations of Ti in hydrocarbon plasma polymer films on the adhesion, proliferation and differentiation of human osteoblast-like MG-63 cells

Marta Vandrovcova, Andrey Grinevich, Martin Drabik, Ondrej Kylian, more

Applied Surface Science > 2015 > 357 > PA > 459-472

Hydrocarbon polymer films (ppCH) enriched with various concentrations of titanium were deposited on microscopic glass slides by magnetron sputtering from a Ti target. The maximum concentration of Ti (about 20at.%) was achieved in a pure argon atmosphere. The concentration of Ti decreased rapidly after n-hexane vapors were introduced into the plasma discharge, and reached zero values at n-hexane flow...

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Influence of Deposition Conditions on Structure and Aging of C:H:O Plasma Polymer Films Prepared from Acetone/CO₂ Mixtures

Martin Drabik, Jaroslav Kousal, Coralie Celma, Patrick Rupper, more

Plasma Processes and Polymers > 11 > 5 > 496 - 508

The deposition process of C:H:O plasma polymer films was studied at different experimental conditions such as RF power input and acetone/CO₂ gas ratio. Aging of the C:H:O films was studied after their storage both in ambient air and in distilled water at different time scales in order to test their stability. Permanent hydrophilic plasma polymers are obtained showing only minor changes during aging...

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Back Cover: Plasma Process. Polym. 5∕2014

Martin Drabik, Jaroslav Kousal, Coralie Celma, Patrick Rupper, more

Plasma Processes and Polymers > 11 > 5 > 509 - 509

Back Cover: Acetone and carbon dioxide are used within a symmetric RF plasma discharge to deposit oxygenfunctional plasma polymer films that are exceptionally stable under aging conditions. Further details can be found in the article by Dirk Hegemann et. al. on page 496.

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Deposition of Al nanoparticles and their nanocomposites using a gas aggregation cluster source

Oleksandr Polonskyi, Ondřej Kylián, Martin Drábik, Jaroslav Kousal, more

Journal of Materials Science > 2014 > 49 > 9 > 3352-3360

The study describes the preparation and properties of Al/Al_xO_y nanoparticles and their nanocomposites with hydrocarbon plasma polymer. The nanoparticles were deposited using a simple gas aggregation cluster source based on a planar magnetron. The influence of deposition parameters on size distribution was studied. It was found that Al nanoparticles may be deposited with mean diameter ranging from...

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Nanocomposite and nanostructured films with plasma polymer matrix

Hynek Biederman, Ondrej Kylian, Martin Drabik, Andrei Choukourov, more

Surface & Coatings Technology > 2012 > 211 > Complete > 127-137

Nanocomposite and nanostructured films have been studied for several decades mainly due to their unique physical, chemical or bioresponsive properties. The main attention has been paid to metal/plasma polymer nanocomposites prepared by simultaneous plasma polymerization and metal co-sputtering or evaporation. These nanocomposite films are concisely reviewed. More complex composites that are prepared...

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Deposition of Fluorocarbon Nanoclusters by Gas Aggregation Cluster Source

Martin Drábik, Anton Serov, Ondřej Kylián, Andrei Choukourov, more

Plasma Processes and Polymers > 9 > 4 > 390 - 397

Gas aggregation cluster source based on planar magnetron was used for deposition of fluorocarbon nanocluster films. The films possess a high roughness with a size of nanoclusters estimated to be about 30 nm in average. Their chemical structure was found to resemble that of a conventional bulk polytetrafluoroethylene which was confirmed by X‐ray photoelectron spectroscopy and Fourier‐transform infrared...

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Effect of different surface nanoroughness of titanium dioxide films on the growth of human osteoblast‐like MG63 cells

Marta Vandrovcova, Jan Hanus, Martin Drabik, Ondrej Kylian, more

Journal of Biomedical Materials Research Part B: Applied Biomaterials > 100A > 4 > 1016 - 1032

Cell behavior depends strongly on the physical and chemical properties of the material surface, for example, its chemistry and topography. The authors have therefore assessed the influence of materials of different chemical composition (i.e., glass substrates with and without TiO₂ films in anatase form) and different surface roughness (R_a = 0, 40, 100, or 170 nm) on the adhesion, proliferation, and...

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Control of Wettability of Plasma Polymers by Application of Ti Nano‐Clusters

Ondřej Kylián, Oleksandr Polonskyi, Jiří Kratochvíl, Anna Artemenko, more

Plasma Processes and Polymers > 9 > 2 > 180 - 187

Two‐step process that allows controlling independently roughness and chemical composition of plasma polymers, i.e., two parameters determining the wettability of such materials, is presented. In the first step a film composed of Ti nano‐clusters is deposited on a smooth substrate. Nano‐cluster films of different roughness can be obtained depending on deposition time. In the second step the nano‐cluster...

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Deposition of nanostructured fluorocarbon plasma polymer films by RF magnetron sputtering of polytetrafluoroethylene

Ondřej Kylián, Martin Drábik, Oleksandr Polonskyi, Juraj Čechvala, more

Thin Solid Films > 2011 > 519 > 19 > 6426-6431

The RF magnetron sputtering of polytetrafluoroethylene target is studied with the aim to find out conditions leading to the deposition of super-hydrophobic thin films. It is shown that such coatings can be prepared at elevated pressures and a longer distance between the sputtered target and the substrate. This is explained by an increase in the density of longer C _x F _y molecules that...

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Morphology of Titanium Nanocluster Films Prepared by Gas Aggregation Cluster Source

Martin Drábik, Andrei Choukourov, Anna Artemenko, Jaroslav Kousal, more

Plasma Processes and Polymers > 8 > 7 > 640 - 650

Titanium nanocluster films were prepared using a gas aggregation cluster source based on a planar magnetron following a Haberland concept and using Ar as a working gas. The films were deposited in dependence on the argon pressure inside the cluster source and on the magnetron current. Prior to the analysis, deposited metal nanocluster films were allowed to oxidize in air at room temperature. Selected...

article

Super‐Hydrophobic Coatings Prepared by RF Magnetron Sputtering of PTFE

Martin Drábik, Oleksandr Polonskyi, Ondřej Kylián, Juraj Čechvala, more

Plasma Processes and Polymers > 7 > 7 > 544 - 551

Fluorocarbon plasma polymer films were prepared by RF magnetron sputtering in Argon from a balanced magnetron equipped with polytetrafluoroethylene (PTFE) target. Depending on the deposition conditions, primarily on the working gas pressure and distance between the target and the substrate, plasma polymer ﬁlms were obtained with distinctly different chemical composition and/or morphology, as measured...

article

Plasma Process. Polym. 1/2010

Andrei Choukourov, Pavel Solar, Oleksandr Polonskyi, Jan Hanus, more

Plasma Processes and Polymers > 7 > 1 > n/a - n/a

Cover: Heterogeneous nanoscale columns of titanium and hydrocarbon plasma polymer are prepared by magnetron sputtering using glancing angle deposition (GLAD). The flux ratio between Ti atoms and hydrocarbon species is the key parameter influencing morphology and chemical composition of such structures. Further details can be found in the article by A. Choukourov,^* P. Solar, O. Polonskyi, J. Hanus,...

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Structured Ti/Hydrocarbon Plasma Polymer Nanocomposites Produced By Magnetron Sputtering with Glancing Angle Deposition

Andrei Choukourov, Pavel Solar, Oleksandr Polonskyi, Jan Hanus, more

Plasma Processes and Polymers > 7 > 1 > 25 - 32

Structured Ti/hydrocarbon plasma polymer nanocomposite films are deposited at a glancing angle by magnetron sputtering of titanium in an Ar/hexane mixture and by sequential magnetron sputtering of titanium and polypropylene. The surface chemistry of such films is tuned by adjusting the gas mixture composition. The structure of the substrate may convert the morphology of organic films deposited at...

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A68 Results of rekey verification at the clinical centers in the hemodialysis (HEMO) study

Jennifer Gassman, Kim Yanchar, Lata Paranandi, Martin Drabik, more

Controlled Clinical Trials > 1996 > 17 > 2 Supplement 1 > S77-S78

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