Bremen 2017 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 4: Plasma Technology
P 4.7: Vortrag
Montag, 13. März 2017, 15:45–16:00, HS 2010
Characterization of two APPJs for biomedical applications — •Daniela Coenen, Julian Kaupe, Slobodan Mitic, Jan Philipps, and Detlev Hofmann — I. physikalisches Institut, Justus-Liebig-Universität, Giessen, Germany
Two atmospheric pressure plasma jets (APPJ) for biomedical applications have been designed and investigated. Firstly an APPJ for liquid spray treatment has been built to produce plasma activated liquids. Plasma quality was characterized by optical emission spectroscopy and phase resolved imaging while effect of a plasma on liquid droplets was evaluated by detection of radicals by electron-paramagnetic-resonance. The device was shown to be an efficient source for production and deposition of plasma activated liquids.
Furthermore a DBD-APPJ has been built for treatment of bacteria and viruses in solutions. Samples can be treated in a closed chamber providing conditions for systematic study of gas mixture effect on mortality of microorganisms in controllable environment. First experiments have been conducted comparing argon and helium as a carrier gas with admixtures of N2 and synthetic air. Moreover optical and electrical diagnostics have been performed with the aim to investigate the correlation between plasma parameters and bactericidal effects. Additionally gas temperature has been estimated from rotational temperature of nitrogen second positive spectra. Using helium as carrier gas leads to higher power consumption at constant input voltages and better bactericidal effects than usage of argon. For admixtures of N2 a significant decrease of the ion-to-neutral-ratio of N2 was observed.