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Detection of free radicals produced by a pulsed electrohydraulic discharge using electron spin resonance
Institution:1. Environment and Chemistry Department, Technology Research Institute of Osaka Prefecture, 2-7-1 Ayumino, Izumi, Osaka 594-1157, Japan;2. Department of Mechanical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531, Japan;1. Institut d’Electronique, de Microélectronique et de Nanotechnologie (IEMN) – UMR CNRS 8520, Université Lille Nord de France – Sciences et Technologies, Villeneuve d’Ascq, France;2. Institut Charles Viollette (ProBioGEM team) – EA 1026, Université Lille Nord de France – Sciences et Technologies, Villeneuve d’Ascq, France;1. Electromagnetics Research Laboratory, Amirkabir University of Technology, Tehran, Iran;2. Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran;3. Department of Electrical, Electronic, and Information Engineering, University of Bologna, Bologna, Italy;1. State Key Lab of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China;2. China Southern Power Grid Co. Ltd, Guangzhou, Guangdong Province, China;1. Department of Chemistry and Biochemistry, San Diego State University, San Diego, CA 92182-1030, USA;2. Centro de Graduados e Investigación del Instituto Tecnológico de Tijuana, Apdo Postal 1166, Tijuana, BC, Mexico;1. Department of Dental Hygiene, College of Health Science, Eulji University, 553 Sansung-Daero, Soojung-Gu, Seongnam 461-713, Republic of Korea;2. Oral Cancer Research Institute, Department of Oral Biology, and BK21 PLUS Project, Yonsei University College of Dentistry, Seoul 120-752, Republic of Korea;3. The Applied Life Sciences, Graduate School, Yonsei University, Seoul 120-749, Republic of Korea
Abstract:The detection of free radicals such as hydroxyl radical and hydrogen radical for plasma in solution induced by a pulsed electrohydraulic discharge are successfully performed using electron spin resonance measurement. The plasma reactor is a barrier-type and consists of a stainless needle high-voltage (+35 to 65 kV) electrode partially immersed in the solution and a Pyrex glass solution container around which an aluminum film grounded electrode is wrapped. Streamers are induced in the solution. After adding iron (II) sulfate or radical trapping agent before the plasma application, the spectrum for radicals is clearly detected. A reactive dye solution is dramatically decolorized.
Keywords:Electrohydraulic discharge  Electron spin resonance  Free radical  Pulse high voltage  Streamer  Radical trapping agent
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