Analysis of the Reactive Species in the Gas/Plasma–Water Interactions
Hassan M.E., Janda M., Machala Z.
9th Central European Symposium on Plasma Chemistry (CESPC9) + COST Action CA19110 Plasma Applications for Smart and Sustainable Agriculture (PlAgri), Vysoké Tatry, Slovakia, September 4-9, p. (2022)
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Abstract: Atmospheric air plasma produces a mixture of reactive oxygen and nitrogen species (RONS). The plasma–water interaction enables the transport of RONS to the liquid phase, which is significantly enhanced by converting bulk water to microdroplets [1]. Having different Henry’s law solubility coefficients, the expected solubility of various RONS is very different. Here, we aim to verify the applicability of Henry’s law coefficients under strongly nonequilibrium conditions characteristic of plasma–water interaction, with water in the form of microdroplets. This work can lead to optimized designs of plasma–water interaction systems for multiple applications in biomedicine, environment, and agriculture.
Figure 1(a) shows the schematic diagram of the experimental setup. RONS are created by streamer corona discharge in direct contact with water microdroplets. The solvation of RONS in water is compared in two types of microdroplets, charged microdroplets produced by electrospray (ES), and nebulized non-charged microdroplets. Figure 1(b) shows the total molar number of the dissolved aqueous RONS. The amount of H2O2(aq) and NO3¯(aq) (mainly from gaseous HNO3) dissolved in the nebulized microdroplets is around 1 order of magnitude higher compared to that in the ES microdroplets. We assume that H2O2 and HNO3 solvation in nebulized microdroplets is enhanced by their smaller size, providing larger plasma–water interface area. On the other hand, the production of NO2¯(aq) (mainly from HNO2 [2]) is higher in the charged ES microdroplets.
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