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Your search keyword '"Černák, Mirko"' showing total 246 results
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246 results on '"Černák, Mirko"'

58. ATMOSPHERIC PRESSURE PLASMA CLEANING AND ACTIVATION OF FLOAT SODA-LIME GLASS PRIOR TO LAMINATION PROCESSING

Author

SIHELNÍK, Slavomír, primary, KELAR, Jakub, additional, ZEMÁNEK, Miroslav, additional, BEIER, Oliver, additional, KELAR TUČEKOVÁ, Zlata, additional, KRUMPOLEC, Richard, additional, STUPAVSKÁ, Monika, additional, WITTWER, Jost, additional, GRÜNLER, Bernd, additional, PFUCH, Andreas, additional, KOVÁČIK, Dušan, additional, and ČERNÁK, Mirko, additional

Published
2020
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60. The future for plasma science and technology

Author

Weltmann, Klaus‐Dieter, primary, Kolb, Juergen F., additional, Holub, Marcin, additional, Uhrlandt, Dirk, additional, Šimek, Milan, additional, Ostrikov, Kostya (Ken), additional, Hamaguchi, Satoshi, additional, Cvelbar, Uroš, additional, Černák, Mirko, additional, Locke, Bruce, additional, Fridman, Alexander, additional, Favia, Pietro, additional, and Becker, Kurt, additional

Published
2018
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62. White paper on the future of plasma science and technology in plastics and textiles

Author

Cvelbar, Uroš, primary, Walsh, James L., additional, Černák, Mirko, additional, de Vries, Hindrik W., additional, Reuter, Stephan, additional, Belmonte, Thierry, additional, Corbella, Carles, additional, Miron, Camelia, additional, Hojnik, Nataša, additional, Jurov, Andrea, additional, Puliyalil, Harinarayanan, additional, Gorjanc, Marija, additional, Portal, Sabine, additional, Laurita, Romolo, additional, Colombo, Vittorio, additional, Schäfer, Jan, additional, Nikiforov, Anton, additional, Modic, Martina, additional, Kylian, Ondrej, additional, Polak, Martin, additional, Labay, Cedric, additional, Canal, Jose M., additional, Canal, Cristina, additional, Gherardi, Matteo, additional, Bazaka, Kateryna, additional, Sonar, Prashant, additional, Ostrikov, Kostya K., additional, Cameron, David, additional, Thomas, Sabu, additional, and Weltmann, Klaus‐Dieter, additional

Published
2018
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68. [Acrylic acid plasma treatment of polypropylene nonwoven fabric] [Włókniny polipropylenowe poddane obróbce plazmowej z zastosowaniem kwasu akrylowego]

Author

Buček, Andrej, Popelka, Anton, Zahoranová, Anna, Kováčik, Dusˇan, Novák, Igor, and Černák, Mirko

Subjects
Hydrogel, Plasma grafting, Diaphragm discharge, technology, industry, and agriculture, Plasma treatment, Biocompatibility, Peel strength
Abstract

Nowadays hydrogel materials are being used in medical practice for wound dressing purposes. Hydrogel/textile composites can be formed to increase the mechanical strength and handling capability of hydrogel materials. Nonwoven textiles are optional for such applications, however, it is often necessary to improve their surface properties. Here plasma activation/grafting of polypropylene (PP) nonwoven fabric with an acrylate layer to improve its adhesive properties is reported. A diaphragm discharge was used for the plasma treatment of the PP fabric. The discharge was burnt in a solution of acrylic acid (AAc), which resulted in a single step process of plasma activation and plasma grafting of the fabric. Results of wettability testing and ATR-FTIR measurements showed the existence of a thin poly(acrylic acid) (PAAc) layer grafted on the fabric surface. Peel strength measurements showed a 4.7 fold increase in the peel strength when compared with untreated PP fabric. This publication is the result of the project: "Applied research and development of innovative drilling technology for ultra--deep geothermal wells", ITMS code 26240220042, supported by the Rese-arch & Development Operational Pro-gramme funded by the ERDF. This work was supported by the Slovak Research and Development Agency under contract No. APVV-14-0518. Scopus

Published
2016

76. Streamer breakdown: cathode spot formation, Trichel pulses and cathode-sheath instabilities.

Author

Černák, Mirko, Hoder, Tomáš, and Bonaventura, Zdeněk

Subjects
*GLOW discharges, *CATHODES, *COMPUTER simulation, *AVALANCHES, *SIMULATION methods & models
Abstract

The review provides an up-to-date overview and discussion of phenomena related to positive streamer breakdowns in short uniform and non-uniform field (corona) gaps. The terminology used to specify different types of streamer phenomena is critically discussed in light of a unified theory of high-pressure gas discharges describing the sequence of ionization events from initial electron avalanches up to a partial or complete breakdown. The emphasis is given to the understanding of the formation of an active cathode spot by the streamer arrival to the cathode, which is the critical but still obscure phase of the breakdown development. Based on the analysis including a computer simulation model a hypothesis is advanced that also such widely studied and practically important gas discharge phenomena as negative corona Trichel pulses and fast ionization instabilities in cathode regions of high-pressure gas discharges are due to the formation of positive streamers in the immediate cathode vicinity. The proposed hypothesis offers attractive feature of the unification of a wide scale of high-pressure gas discharges within the general class of positive streamer initiated breakdown phenomena. Moreover, it provides indications for further study in the field both by experiment and computer simulations. [ABSTRACT FROM AUTHOR]

Published
2020
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77. Numerical simulation of streamer–cathode interaction.

Author

Odrobina, Igor and Černák, Mirko

Subjects
*CATHODES, *CORONA discharge
Abstract

Presents a study that analyzed streamer arrival at the cathode and its transformation to the stationary cathode fall in a positive point-to-plane corona discharge. Method of the study; Results and discussion; Conclusion.

Published
1995
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78. Magnetic nanoparticles: From Design and Synthesis to Real World Applications

Author

Kudr, Jiří, Haddad, Yazan Abdulmajeed Eyadh, Richtera, Lukáš, Heger, Zbyněk, Černák, Mirko, Adam, Vojtěch, Zítka, Ondřej, Kudr, Jiří, Haddad, Yazan Abdulmajeed Eyadh, Richtera, Lukáš, Heger, Zbyněk, Černák, Mirko, Adam, Vojtěch, and Zítka, Ondřej

Abstract

The increasing number of scientific publications focusing on magnetic materials indicates growing interest in the broader scientific community. Substantial progress was made in the synthesis of magnetic materials of desired size, morphology, chemical composition, and surface chemistry. Physical and chemical stability of magnetic materials is acquired by the coating. Moreover, surface layers of polymers, silica, biomolecules, etc. can be designed to obtain affinity to target molecules. The combination of the ability to respond to the external magnetic field and the rich possibilities of coatings makes magnetic materials universal tool for magnetic separations of small molecules, biomolecules and cells. In the biomedical field, magnetic particles and magnetic composites are utilized as the drug carriers, as contrast agents for magnetic resonance imaging (MRI), and in magnetic hyperthermia. However, the multifunctional magnetic particles enabling the diagnosis and therapy at the same time are emerging. The presented review article summarizes the findings regarding the design and synthesis of magnetic materials focused on biomedical applications. We highlight the utilization of magnetic materials in separation/preconcentration of various molecules and cells, and their use in diagnosis and therapy.

Published
2017

88. Atmospheric pressure plasma treatment of agricultural seeds of cucumber (<italic>Cucumis sativus L</italic>.) and pepper (<italic>Capsicum annuum L</italic>.) with effect on reduction of diseases and germination improvement.

Author

Štěpánová, Vlasta, Slavíček, Pavel, Kelar, Jakub, Prášil, Jan, Smékal, Milan, Stupavská, Monika, Jurmanová, Jana, and Černák, Mirko

Subjects
CUCUMBER diseases & pests, THERMAL plasmas, PEPPER seeds, GERMINATION, ATMOSPHERIC pressure
Abstract

The paper presents the effects of plasma treatment on agricultural seeds. Cucumber and pepper seeds, widely used in agriculture, were treated using the Diffuse Coplanar Surface Barrier Discharge (DCSBD) at atmospheric pressure in ambient air. The plasma treatment (4 s for pepper, 20 s for cucumber) led to an improvement of germination and germinating power. XPS confirmed chemical changes on the seed surface. The surface morphology of the plasma treated seeds showed no evidence of structural damage. The conclusion is that DCSBD proves to be able to reduce some of the microorganisms and pathogens affecting the seeds. Thanks to their technical simplicity and easy scaling‐up, DCSBD plasma sources open new opportunities for atmospheric pressure plasma application in the agricultural industry. [ABSTRACT FROM AUTHOR]

Published
2018
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89. USING DIFFUSE COPLANAR SURFACE BARRIER DISCHARGE FOR IMPROVEMENT OF FELTING PROPERTIES OF ANIMAL FIBRES

Author

Voráč Jan, Štěpánová Vlasta, Slavíček Pavel, Sťahel Pavel, and Černák Mirko

Subjects
diffuse coplanar surface barrier discharge felting rabbit fibres fibers
Abstract

The Diffuse Coplanar Surface Barrier Discharge (DCSBD) has shown its great potential for applications in textile industry recently1. A rather interesting synthesis of the latest technologies and a very traditional industry is currently being developed in cooperation of our physics department and TONAK - a company with more than 200 years tradition in the hat making from natural felt. This is also covered by international patent WO2011044859: An Apparatus and Method for Improving Felting Properties of Animal Fibres by plasma Treatment.

Published
2012

95. Plasma treatment of detonation and HPHT nanodiamonds in diffuse coplanar surface barrier discharge in H2/N2 flow.

Author

Jirásek, Vít, Čech, Jan, Kozak, Halyna, Artemenko, Anna, Černák, Mirko, and Kromka, Alexander

Subjects
NANODIAMONDS, NANOCRYSTALS, BIOMOLECULES, BIOPOLYMERS, AMINES
Abstract

Due to extraordinary properties and biocompatibility, diamond nanoparticles - nanodiamonds (NDs) are considered for various biomedical applications. Amongst other functional groups which may be grafted on the NDs surface, the amines (NH x) are highly demanded linkers for biomolecules and dyes. In this regard, a non-destructive, non-hazardous and low-cost method of NDs amination would further accelerate their industrial applications in biomedicine and life science. Here we present a study on NDs treatment using diffuse coplanar surface barrier discharge in the gas mixture H2:N2 = 1:1 at the atmospheric pressure. Detonation and high pressure-high temperature nanoparticles (D-NDs and HPHT-NDs) were used either as-received or air-annealed. The FTIR spectra confirmed the presence of N-H stretching vibrations for all kinds of NDs after the treatment. It was revealed by XPS and FTIR measurements that both kinds of D-NDs (as-received and air-annealed) exhibited higher content of −NH2 functions in the detected nitrogen groups than HPHT-NDs. The treatment of as-received D-NDs led to the conversion of −COOH groups to amides. A large increase of C-H bonds after the discharge treatment was found, especially for the annealed NDs forms. Raman spectroscopy revealed a decrease of sp2 carbon after the treatment of the as-received HPHT-NDs. [ABSTRACT FROM AUTHOR]

Published
2016
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