Greifswald 2024 – scientific programme

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P: Fachverband Plasmaphysik

P 18: Atmospheric Pressure Plasmas and their Applications IV

P 18.1: Invited Talk

Wednesday, February 28, 2024, 16:30–17:00, WW 1: HS

Diffusion of reactive species in aqueous solutions treated by a humid atmospheric pressure plasma jet — •Steffen Schüttler, Emanuel Jeß, and Judith Golda — Plasma Interface Physics, Ruhr-University Bochum, Universitätsstraße 150, 44801 Bochum, Germany

Plasma-treated liquids are used in various fields such as plasma medicine or plasma-assisted biocatalysis. Atmospheric pressure plasma jets are suitable for production of reactive species such as H2O2 and introducing them into liquids under very good control [1]. The use of reactive species in the liquid requires their solubility and transport through the liquid. In this work, the delivery of reactive species from a humid atmospheric pressure plasma jet into a liquid and the diffusion of OH and H2O2 in the plasma-treated liquid were investigated. The capillary plasma jet used is comparable to the COST reference jet and was operated in humid He. UV absorption was used to measure H2O2 in the liquid, the distribution of OH was visualised by the chemiluminescence of luminol and particle imaging velocimetry (PIV) was used to study convective transport. At low gas flow rates, diffusion of H2O2 through the liquid was measurable, whereas at high gas flow rates, convective transport dominates. In all treatments studied, OH was found to be present mainly at the liquid surface, even at high gas flow rates.

This work is supported by the DFG within CRC1316 (Subproject B11, project number 327886311).

[1] Schüttler et al., Plasma. Process Polym. 2023, e2300079

Keywords: Atmospheric pressure plasma jet; Plasma-treated liquid; Diffusion; H2O2 production