Material conformity and bactericidal properties of high-frequency-pulse-modulated and low-frequency-pulse-excited plasmas

2018 5th Global Conference on Polymer and Composite Materials

材料科学;化学

Okawa, H.^1 ; Akitsu, T.^2

Faculty of Future Industry, Happy Science University, Hitotsumatsuhei 4427-1, Chouseimura, Chiba, Japan^1

Professor Emeritus of the National University of Yamanashi, Takeda 4-3-11, Yamanashi, Kofu, Japan^2

关键词: Bacillus stearothermophilus;    Bactericidal effects;    Bactericidal properties;    High-frequency pulse;    Neutral gas temperatures;    Normal atmospheric pressure;    Opportunistic infections;    Plasma sterilization;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/369/1/012026/pdf
DOI  :  10.1088/1757-899X/369/1/012026

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Plasma sterilization attracts an increasing attention as an alternative method for chemical sterilization. In this study, we investigate plasma sterilization for practical applications, particularly in dentistry and oral surgery [1]. Helium-diluted oxygen was excited by a dielectric barrier electrode at normal atmospheric pressure. Control of the neutral gas temperature was performed under the plasma sterilization. The relation between the intensity of the spectral emission from the excited oxygen atoms and bactericidal effect was investigated using Bacillus stearothermophilus and opportunistic infection bacterium. A comparison is performed with a low-frequency wide-gap discharge. Degradation and material conformity were investigated using the Tyvek unwoven fabric for the sterile package and soft-silicone resin, methyl-methacrylate powder filler used in the dental surgery.