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Chandrashekaraiah T.H.,University of Greifswald | Bogdanowicz R.,University of Greifswald | Bogdanowicz R.,Technical University of Gdansk | Danilov V.,University of Greifswald | And 3 more authors.
European Physical Journal D | Year: 2015

Abstract Organic polymer thin films have been deposited on Si(100) and aluminum coated glass substrates by a dielectric barrier discharge (DBD) operated at medium pressure using different C2H m /N2 (m = 2, 4, 6) gas mixtures. The deposited films were characterized by various spectroscopic techniques. Fourier transform infrared reflection absorption spectroscopy (FT-IRRAS) revealed the chemical functional groups present in the films. The surface chemical compositions have been derived from X-ray photo electron spectroscopy (XPS). FT-IRRAS and XPS show the presence of sp, s p 2 and s p 3 bonds of carbon and nitrogen. Various functional groups such as NH containing, saturated and unsaturated alkyl groups have been identified. Thin films obtained from C2H2/N2 and C2H4/N2 gas mixtures revealed a higher N/C ratio when compared to thin films obtained from C2H6/N2. Thickness, refractive index and extinction coefficient were evaluated by spectroscopic ellipsometry (SE). Significant differences between the films obtained with different gas mixtures are observed. Graphical abstract: [Figure not available: see fulltext.] © 2015 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.

Hager S.,Klinik Fur Plastische Rekonstruktive und Asthetische Chirurgie | Gura T.,Leibniz Institute For Plasmaforschung Und Technology | Mahrenholz C.,Leibniz Institute For Plasmaforschung Technology
Haut | Year: 2015

Non thermal plasma (40 °C max.), which is mild to the skin, initialises wound healing processes and decontaminates the wound. A group of experts is developing this technology for medical purposes. Patent, certification and market access are pending.

Baeva M.,Leibniz Institute For Plasmaforschung Und Technology | Uhrlandt D.,Leibniz Institute For Plasmaforschung Und Technology
Plasma Sources Science and Technology | Year: 2011

A three-dimensional model of a dc plasma torch with a rod-type cathode at atmospheric pressure has been developed in order to study a magnetically rotating arc in argon. The interplay between the arc and the plasma flow is described by means of magnetohydrodynamic equations in combination with a K-ε turbulence model. The simulation study is performed in terms of a two-temperature description (different electron and heavy particle temperatures). In the absence of magnetic field, the electron and heavy particle temperatures are nearly identical in the arc core, while near the walls, in the arc fringes and in the plume there are significant differences. With the magnetic field present, deviations from LTE appear even in the arc core and electron and heavy particle temperature differ there by about 10% thus emphasizing the need for a two-temperature treatment. The high temperature plasma region constrains in the axial and expands in the radial direction. The gas temperature gets lower by 2000 K in the arc core. In a moderately strong magnetic field, the magnetically driven plasma rotation is resolved and deviations from the axial symmetry are observed. Results for plasma and flow parameters are obtained and discussed. © 2011 IOP Publishing Ltd.

Baeva M.,Leibniz Institute For Plasmaforschung Und Technology | Uhrlandt D.,Leibniz Institute For Plasmaforschung Und Technology
Surface and Coatings Technology | Year: 2010

A three-dimensional magnetohydrodynamic model of an inductively coupled plasma depositor has been developed and applied to describe the process of outside vapor deposition during manufacturing of preforms for optical fibers. The steady state continuity, momentum, enthalpy and diffusion equations are solved consistently with the energy coupling accomplished through the electromagnetic field of an induction coil and the radiation losses from the plasma. Local thermodynamic equilibrium, steady and laminar flow, and optically thin plasma are assumed. A chemical surface reaction serving as a boundary condition for species mass fractions in the fluid is set to describe the deposition process. The model supplies information about the flow and temperature distribution of the fluid, the electromagnetic field, and the deposition rate on the target surfaces for complex real geometries. © 2010 Elsevier B.V.

Muller S.,Leibniz Institute For Plasmaforschung Und Technology | Saulich K.,Leibniz Institute For Plasmaforschung Und Technology | Kruger T.,Leibniz Institute For Plasmaforschung Und Technology
Chemie-Ingenieur-Technik | Year: 2012

Adsorbents are widely-used in the area of cleaning as well as enrichment of gas components. For the regeneration of clinoptilolite loaded with ammonia, a packed-bed reactor was developed on the basis of a dielectric barrier discharge. It was proved that adsorbed NH3 is released at relatively low temperature and low energy consumption. For the further optimization of the method the influence of the power and the pulse break ratio of sustaining voltage were tested. It was shown that with the chosen plasma method the absorber material was loaded repeatedly and subsequently regenerated. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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