Investigation on dinitrogen pentoxide roles on air plasma effluent exposure to liquid water solution

This paper experimentally discusses roles of dinitrogen pentoxide (N₂O_5gas) in the air plasma effluent gas on the effluent gas exposed liquid water, through nitrate () generation and nitration processes in the liquid phase. The generation from N₂O_5gas is suppressed approximately up to 50% by a competing reaction with a p-hydroxyl-phenyl-acetate (p-HPA) at pH = 11. This indicates a near-surface generation of an intermediate species derived from N₂O_5gas, which turns to . Also, it is found that the nitration reaction rate observed with NiSPY-3N can be of the order of the generation rate. From experimental results on the air plasma effluent gas and the liquid phase species, the role of the N₂O_5gas exposure to the liquid surface is interpreted as an intermediate species supply to the liquid surface, such as the solvated nitronium ion (). This deduced roles of N₂O_5gas can contribute to developments and understanding of the N₂O_5gas-involved plasma biological applications.