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等离子医学
SJR: 0.278 SNIP: 0.183 CiteScore™: 0.57

ISSN 打印: 1947-5764
ISSN 在线: 1947-5772

等离子医学

DOI: 10.1615/PlasmaMed.2016015934
pages 159-175

Large-Volume Plasma Device with Internally Mounted Face-Type Planar Microwave Launchers for Low-Temperature Sterilization

Mrityunjai Kumar Singh
Indian Agricultural Research Institute, Regional Station-Karnal 132001, India
Masaaki Nagatsu
Graduate School of Science and Technology, Shizuoka University, 3-5-1, Johoku, Naka-ku, Hamamatsu 432-8561, Japan

ABSTRACT

In this study, large-volume microwave excited surface-wave and volume-wave plasmas were investigated for low temperature sterilization of medical instrument. The two planar microwave launchers, each supported by a 1.5-kW magnetron, were face-to-face installed inside the vacuum chamber of plasma device for homogeneous sterilization. The spatial distributions of plasma discharges in the surface-wave and volume-wave modes were characterized under various discharge conditions using single or double microwave launchers of the experimental setup. The electron density increased to about twice in the case of double launchers as compared to single launcher without any microwave interference between two launchers. With this plasma setup, we confirmed the successful inactivation of Tyvek-wrapped spore-forming bacteria at temperatures less than 70°C and within 70 to 80 min with time-modulated surface-wave and volume-wave plasma, respectively.