The Role of Oxygen in a Large Area of RF-Powered Atmospheric Pressure Dielectric Barrier Glow Discharge Plasma in Sterilization

被引：13
|
作者：
Pang, Hua [1 ]
Chen, Qiang [2 ]
Li, Bin [2 ]
Fei, Fei [2 ]
Yang, Size [1 ,3 ]
机构：
[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[2] Beijing Inst Graph Commun, Lab Plasma Phys & Mat, Beijing 102600, Peoples R China
[3] Xiamen Univ, Fujian Key Lab Plasma & Magnet Resonance, Dept Aeronaut, Sch Phys & Mech & Elect Engn, Xiamen 361005, Peoples R China
来源：
IEEE TRANSACTIONS ON PLASMA SCIENCE | 2011年 / 39卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Oxygen radicals; radio-frequency (RF)-powered atmospheric pressure plasma; sterilization mechanisms; LOW-TEMPERATURE PLASMA; ESCHERICHIA-COLI; RADIOFREQUENCY;
D O I：
10.1109/TPS.2011.2155104
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
A nonequilibrium Ar/O-2 plasma at atmospheric pressure was generated between two parallel square electrodes by a 13.56-MHz power supplier. Experimental results demonstrate that the Ar/O-2 plasma more effectively kills Staphylococcus aureus and Escherichia coli than the Ar plasma. When the O-2 flow rate increases from 0 to 100 sccm step by step, the discharge voltage and the radio-frequency (RF) current always show sinusoidal waveforms, and the discharges maintain the a mode as well. In addition, the sterilization efficiency values of the RF-powered atmospheric pressure Ar/O-2 plasma depend on the oxygen fraction in Ar gas. It is found that the sterilization efficiency of the Ar/O-2 plasma is highest with 0.5 vol.% oxygen in argon gas, corresponding to the maximum production of O(P-3) radicals. It is considered that the O(P-3) radicals produced by the Ar/O-2 plasma play a significant role in atmospheric plasma sterilization.
引用
收藏
页码：1689 / 1694
页数：6
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