title: Aqueous reactive species induced by a surface air discharge: Heterogeneous mass transfer and liquid chemistry pathways.
abstract: Plasma-liquid interaction is a critical area of plasma science and a knowledge bottleneck for many promising applications. In this paper, the interaction between a surface air discharge and its downstream sample of deionized water is studied with a system-level computational model, which has previously reached good agreement with experimental results. Our computational results reveal that the plasma-induced aqueous species are mainly H(+), nitrate, nitrite, H2O2 and O3. In addition, various short-lived aqueous species are also induced, regardless whether they are generated in the gas phase first. The production/loss pathways for aqueous species are quantified for an air gap width ranging from 0.1 to 2 cm, of which heterogeneous mass transfer and liquid chemistry are found to play a dominant role. The short-lived reactive oxygen species (ROS) and reactive nitrogen species (RNS) are strongly coupled in liquid-phase reactions: NO3 is an important precursor for short-lived ROS, and in turn OH, O2(-) and HO2 play a crucial role for the production of short-lived RNS. Also, heterogeneous mass transfer depends strongly on the air gap width, resulting in two distinct scenarios separated by a critical air gap of 0.5 cm. The liquid chemistry is significantly different in these two scenarios.
authors.affiliation: State Key Lab of Electrical Insulation and Power Equipment, Center for Plasma Biomedicine, Xi'an Jiaotong University, Shaanxi, P R China.
authors.forename: D X
authors.initials: DX
authors.lastname: Liu
authors.affiliation: State Key Lab of Electrical Insulation and Power Equipment, Center for Plasma Biomedicine, Xi'an Jiaotong University, Shaanxi, P R China.
authors.forename: Z C
authors.initials: ZC
authors.lastname: Liu
authors.affiliation: State Key Lab of Electrical Insulation and Power Equipment, Center for Plasma Biomedicine, Xi'an Jiaotong University, Shaanxi, P R China.
authors.forename: C
authors.initials: C
authors.lastname: Chen
authors.affiliation: State Key Lab of Electrical Insulation and Power Equipment, Center for Plasma Biomedicine, Xi'an Jiaotong University, Shaanxi, P R China.
authors.forename: A J
authors.initials: AJ
authors.lastname: Yang
authors.affiliation: State Key Lab of Electrical Insulation and Power Equipment, Center for Plasma Biomedicine, Xi'an Jiaotong University, Shaanxi, P R China.
authors.forename: D
authors.initials: D
authors.lastname: Li
authors.affiliation: State Key Lab of Electrical Insulation and Power Equipment, Center for Plasma Biomedicine, Xi'an Jiaotong University, Shaanxi, P R China.
authors.forename: M Z
authors.initials: MZ
authors.lastname: Rong
authors.affiliation: Frank Reidy Center for Bioelectrics, Old Dominion University, Norfolk, Virginia 23508, USA.
authors.forename: H L
authors.initials: HL
authors.lastname: Chen
authors.affiliation: State Key Lab of Electrical Insulation and Power Equipment, Center for Plasma Biomedicine, Xi'an Jiaotong University, Shaanxi, P R China.|Frank Reidy Center for Bioelectrics, Old Dominion University, Norfolk, Virginia 23508, USA.|Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, Virginia 23529, USA.
authors.forename: M G
authors.initials: MG
authors.lastname: Kong