München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.81: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Interaction of plasma-generated reactive species with methylene blue — •Kerstin Sgonina, Nils Dose, and Jan Benedikt — Institute of Experimental and Applied Physics, Kiel University, Kiel, Germany

The generation of highly reactive species in cold atmospheric pressure plasma jets is used for many different applications. One of them is the treatment of aqueous solutions to produce so-called Plasma Treated Water, which shows a high reactivity with biological substrates caused by the reactive species. Anyhow, the transport of these from gas-phase into liquid-phase and further reaction pathways still need to be studied in more detail. For atomic oxygen, the effective transport into aqueous solutions [1] and the importance for further reactions in water [2] were already proven.

In this contribution, our latest progress in studying the plasma-liquid interaction will be presented. Here, an aqueous methylene blue solution was treated by the effluent of an atmospheric pressure plasma jet, the COST-jet [3], with He/O2 gas mixture. By observing the degradation of methylene blue molecules, the reaction rate was calculated. These results might give an insight whether the reactions in the solution are surface or volume dominated, thus into the reaction mechanism.

[1] M. Mokhtar Hefny et al, J. Phys. D: Appl. Phys., 2016.

[2] J. Benedikt et al, Phys. Chem. Chem. Phys., 2018.

[3] J. Golda et al, J. Phys. D: Appl. Phys., 2016.