Chemical effect of atmospheric DBD plasma on water droplets

This study examines how water droplets interact with atmospheric pressure dielectric barrier discharge (DBD) plasma. A DBD plasma column of 6 cm in length and 2.54 cm in width is filled with droplets. An array of fiber optic probes coupled with a spectrometer for spatial measurement of the plasma properties is used to monitor the plasma-droplet interaction. After that, the treated water droplets are gathered and examined for physical characteristics like pH and conductivity, as well as reactive species including nitrites, nitrates, and hydrogen peroxide. The collected data so far show that the presence of droplets causes a significant decrease in plasma properties like plasma density and electron temperature while increasing gas temperature, particularly in the interface region surrounding the droplet. The preliminary data of reactive species shows that the nitrite concentration increases with an increase in applied voltage and a reduction in helium flow rate. Further analysis and measurements are planned to be carried out.