电晕放电的杀菌机理研究

为研究空气电晕放电等离子体的灭菌机理，采用针-环结构负电晕放电产生大气压低温等离子体，确定了等离子体中各种可能的活性成分，并研究了这些活性成分（紫外线、带电粒子、中性活性物质）的杀菌效率.结果表明，单独的紫外线和臭氧都具有较好的杀菌效果，但二者的联合杀菌作用并不是简单的协同作用；负电晕放电中的中性活性物质起主要杀菌作用；带电粒子起到辅助杀菌的作用，但电晕风中单独的带电粒子几乎没有杀菌作用.提高中性活性成分是提高电晕放电灭菌效果的关键之一. 

Study on the Sterilization Mechanism of Negative Corona Discharge

To investigate the sterilization mechanism of corona discharge in air, a needle-to-ring configuration was employed to produce atmospheric pressure negative corona plasma. The active species from the corona discharge were obtained. The sterilization efficiency of different active substances (i.e., UV, charged particles and neutral active species) were tested experimentally. The results show that, UV and ozone can alone achieve sterilization with high bactericidal efficiency, but they can not complete a simple synergy. In negative corona discharge, neutral active substances act as the key bactericidal agents and the charged particles also play an auxiliary role in sterilization. But individual charged particles have little or no bactericidal effect. It is suggested that improving the neutral active species of corona discharge is beneficial to the plasma sterilization.