Abstract
Conference Title: 2016 IEEE International Conference on Plasma Science (ICOPS) Conference Start Date: 2016, June 19 Conference End Date: 2016, June 23 Conference Location: Banff, AB, Canada Atmospheric pressure plasma gained a great interest from researches due to its large number of biomedical applications. The chemical active species such as O, OH and NO are considered to be the main agent in that applications. Enhancing the plasma reactive species is an essential [1]. Therefore, an investigation the effect of mixing oxygen to cold atmospheric pressure plasma jet (CAPPJ) in air is presented in this work. The CAPPJ is generated by applying AC voltage 14 kV (peak-to-peak), with frequency of 29 kHz to alumina (Al2O3) tube. The tube has 150 mm length with a 4 and 6 mm inner and outer diameter, respectively. Argon flow rate of 4.5 SLM is blown through the alumina tube with small value of oxygen percentage from 0 to 1.2% to form the plasma jet. The addition of oxygen to argon as operating gases enhances the generation of O-radicals and reduces production of the OH-radicals. The electric and spectroscopic characteristics of the generated plasma jet are investigated. The generated plasma jet length and mode of operation varied as a function of oxygen flow rate percentage. The plasma jet length is decreased as the oxygen mixture increases and the plasma mode transmitted from filamentary to diffused mode. As anti-microbial activity, the data indicate an optimum condition of E. coli sterilization at 0.2% of oxygen.