Experimental Investigation of a Helium and Neon Micro Plasma Jet for Endoscopic Applications: Plasma Parameters and Effects of Free Mode vs Conductive Mode
Abstract
Cold atmospheric pressure plasma devices are applied in a variety of setups from dielectric barrier discharges to plasma jets in plasma medical research. They all have in common, that the plasma generated exposes the target with a cocktail of agents, reaching from electrical field to reactive species. Previous investigations on the kINPen [1] as well as on the intended CAP the micro plasma jet [2], have shown the occurrence of a mode switch from free to conductive mode (Fig. 1), where the last could be correlated with strongly improved biological action. So far, mainly the chemical components of the plasma cocktail were correlated with the increased biocide action, but plasma parameters like the electrical field were not investigated yet since they are generally difficult to be accessed [3,4]. This contribution reports on preliminary results of a STSM of two weeks at GREMI (France). This collaboration aimed at investigating with non-invasive techniques several properties of the discharge. By means of high resolution space resolved optical emission spectroscopy, longitudinal profiles of the gas temperature, the molecular fraction of diffusing molecules from the ambient air, the electron density and the electric field have been measured. A peculiarity of the micro plasma jet meant for endoscopic and antiviral oral applications [2] from the INP in Greifswald is uniquely fit for the intended optical diagnostics available at GREMI in Orleans for the characterization of the electric field in neon conditions [4]. While limiting the cocktail complexity is a self establishing necessity when lacking diagnostic possibilities, this contribution
aims at closing this gap via a STSM from the COST action CA20114 PlasTHER.
Acknowledgement:
This work was supported by the German Federal Ministry of Education and Research (BMBF, grant numbers 03COV06A), the by the Ministry of Economics, Employment and Health of the state Mecklenburg-Vorpommern (Germany) with the European Union through European Regional Development Funds (TBI-V-1-361-VBW-124) and by a STSM through PlasTHER (E-COST-GRANT-CA20114-06c5b4e8). The experimental campaign conducted at GREMI was partially supported by the project ANR-22-51-0022.
References
[1] L. Miebach, E. Freund, R. Clemen et. al. Free Radic. Biol. Med., 180, 210 (2022)
[2] D. M. Mrochen, L. Miebach, H. Skowski et. al. Free Radic. Biol. Med., 191, 105 (2022)
[3] G. B. Sretenović, O. Guaitella, A. Sobota et. al. J. Appl. Phys. 121 123304–123304 (2017)
[4] S. Dzikowski, D. Steuer, S. Iséni et. al. Plasma Sources Sci. and Technology, 31, 065014 (2022)