SMuK 2021 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 14: Atmospheric Pressure Plasmas and their Applications II
P 14.7: Vortrag
Donnerstag, 2. September 2021, 15:45–16:00, H5
Loss processes of plasma-generated atomic oxygen in phenol solutions — •Kerstin Sgonina1, Giuliana Bruno2, Stefan Wyprich1, Kristian Wende2, and Jan Benedikt1 — 1Institute of Experimental and Applied Physics, Kiel University, Kiel, Germany — 2Leibniz Institute for Plasma Science and Technology, Greifswald, Germany
Aqueous solutions treated by cold atmospheric pressure plasma jets contain high amounts of reactive species. It has already been shown that atomic oxygen produced by a cold atmospheric pressure plasma jet effectively reacts with organic molecules like phenol dissolved in water without any intermediate reaction steps [1]. However, it is unknown whether the reactions with atomic oxygen are liquid-surface or liquid-volume dominated.
To investigate the loss processes of atomic oxygen in liquid solutions, experimental results are combined with simulations of the reaction kinetics [2]. Phenol solutions were treated with the effluent of a He/O2-plasma ignited in the COST-Jet which provides well-known densities of reactive oxygen species [3]. Variation of the phenol concentration allows an insight into the competing O-loss reactions in gas phase, liquid phase or at the liquid surface. The comparison to simulations of the reaction kinetics and transport from gas into liquid phase reveal the predominance of reactions of atomic oxygen at the liquid surface.
[1] J. Benedikt et al., Phys. Chem. Chem. Phys. 20 12037 (2018).
[2] K. Sgonina et al., J. Appl. Phys. accepted (2021).
[3] G. Willems et al., New J. Phys. 21 059501 (2019).