The Effect of the Type of Gas on Underwater Discharge

The atmospheric-pressure plasma has been proposed as a novel therapeutics for various field of medicine such as anticancer treatment, sterilization, and wound healing. Recent trends of plasma for medical applications focus on the interaction of liquid and reactive species generated by plasma. However, the interactions of liquid and plasma are influenced by surrounding environments such as temperature, humidity. In this work, we suggest the underwater discharge system for medical applications. The system can generate plasma in liquid using capillary electrode having gas channel. Thus, the reactive species generated by plasma interact with liquid without any outside influence and regulate generation of reactive species according to gas type. In order to ascertain the possibility of suggested system for medical applications, we analyze characteristics of underwater discharge and reactive species in water generated by plasma.