Numerical simulation of electric double layer in contact with dielectric barrier discharge: Effects of ion transport parameters in liquid

摘要

The spatiotemporal distribution of charged particles has been investigated through numerical simulation of charged particle behavior in gas and liquid phases in the dielectric barrier discharge of Ar gas in contact with a liquid. In the case of a liquid with a low ion concentration such as de-ionized water, the amount of liquid-phase ions generated by electron or ion irradiation from gas-phase plasma is higher by approximately one order of magnitude than that in the pure electric double layer formed only with the potential difference between the top and bottom of the liquid. When the molecular weight of the ions is larger, the residence time of the ions at the liquid surface becomes longer. If the molecular weight of positive and negative ions is different, heavier ions become dominant at the liquid surface. These characteristics are pronounced by employing a higher frequency voltage, which implies the possibility of preferential reactions at the plasma-liquid interface.