Plasma Equivalent Total Oxidation Potential Control Study

Plasma medical research is to explore the effect of plasma on living things,which is similar to the effect of drugs on the human body.The effect of drug treatment often depends on the composition and dose of the drug,while the effect of plasma on organisms is affected by many factors such as treatment time,area of action,gas composition and so on.Based on this,Lu Xinpei’s team proposed equivalent total oxidation potential(ETOP)to define plasma dose for the first time based on the dominant role of reactive oxygen species species in plasma biological effects.In view of the research status of plasma dose,this paper uses emission spectroscopy to conduct in-depth theoretical research and computational analysis of argon plasma extensification and electron temperature,electron density,metastable and resonance state number density,and models the ETOP of plasma jet,which provides an important reference for plasma biomedical research.This thesis starts from the application background of the topic and the research status of ETOP,and uses equipment such as high-frequency skin beauty devices and other mature products in medical cosmetology to generate stable argon plasma jets in the air.The emission spectroscopy method was used to explore the particle composition and spatial distribution of the jet tip,different axial positions of the jet and the surface of the copper foil by the jet.Next,in view of the unclear internal structure of the high-frequency skin beauty device and the uncontrollable voltage and flow rate,the needle-ring electrode structure was used to build a plasma discharge and spectral diagnosis test platform by itself.At the same time,the spectrometer was used to collect and diagnose the spectral data of the argon plasma jet tip,different axial positions of the jet and the action of the jet on the surface of the copper foil,and the change law of electron temperature and electron density in the jet was calculated.Then,starting from the relationship between ETOP and active particles,the ETOP model and method studied in this paper are clarified,and the spectra of argon plasma jets on five materials: copper foil,ceramic sheet,glass sheet,shelled egg and plastic wrap are collected and analyzed.The effects of argon plasma on different materials,the irradiance of particles on the surface of materials,the electron temperature,and the metastable and resonance state number density of argon were studied.Finally,the ETOP of different axial positions of the jet when there is no(presence)material at the tip of the argon plasma jet,the jet acting on the surface of the material,and the different distances from the nozzle to the material surface are calculated and compared to find out the change law of ETOP.Starting from the irradiance of the obtained intuitive data,the irradiance control model of argon plasma jet is established,which provides ideas and references for the control of oxidation potential.