Surface Dielectric Barrier Discharge in Closed-Volume Air

Abstract

The postdischarge kinetics of reactive species produced by a surface dielectric barrier discharge (SDBD) ignited in closed-volume air for decomposition of organic molecules in aqueous solutions was investigated. A SDBD with surface of 6 cm 2 was operated in a closed volume (0.5 L) of air at atmospheric pressure. The voltage across the plasma gap, the charge transferred through the plasma, and the dissipated power were computed from the charge-voltage diagram to values of 3900V, 0.2 C, and 6W, respectively. The reactive species produced by the SDBD in a closed volume of air were active for decomposition of methylene blue molecules in small volumes of aqueous solution for a relatively long period of time af-position of organic molecules was approximately 11 minutes. However, SDBD operation in closed-volume air shortened the lifetime of polyimide dielectric of the discharge microelectrode system due to the increased humidity and reactivity of the active species generated by plasma. Measurement of relative humidity revealed that the discharge enhanced water evaporation. Atomic force microscopy investigations of dielectric surface in the discharge region roughness as the result of SDBD operation.

Reduced electric field and gas temperature effects on chemical product dynamics in air surface dielectric barrier discharges: from macro-physical parameters to micro-chemical mechanisms

“…2 shows the plasma reactor and the experimental platform, consisting of a gas-tight chamber with an SDBD device and the associated experimental setup. The chamber was made of polytetrafluoroethylene with two windows pre-set for mounting ultra-clear quartz and potassium bromide window pieces for in situ semi-quantitative measurements 23 of UV absorption spectra and FTIR spectra, respectively. The SDBD discharge apparatus is made by the screen-printing using ceramic as dielectric, and tungsten electrodes located on both sides of it as high voltage and ground electrodes, respectively.…”