圧力制御液体下におけるレーザ生成化学反応場の創生

• Project Area: Creation of Science of Plasma Nano-Interface Interactions
• Project/Area Number: 22110512
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Kumamoto University
• Principal Investigator: 浪平 隆男 熊本大学, バイオエレクトリクス研究センター, 准教授 (40315289)
• Project Period (FY): 2010 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000); Fiscal Year 2011: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000); Fiscal Year 2010: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
• Keywords: レーザ / プラズマ / 高圧力

Research Abstract

研究代表者である浪平は、二酸化炭素雰囲気下において、圧力の増加に伴う絶縁破壊(プラズマ形成)時の発光強度増加、並びに、圧力の増加に伴うレーザアブレーション深さの増加を見出し、加えて、亜臨界水雰囲気下においては、絶縁破壊に伴う新規反応経路を経たフェノールの重合を見出している。これらの成果は、「プラズマエネルギー密度の雰囲気圧力による制御性」及び「高圧雰囲気下形成プラズマの化学反応場としての新規性」を示唆しており、本申請研究では、圧力制御下の液体・気体中にてレーザブレークダウンプラズマを形成することで、「雰囲気液体圧力によるプラズマエネルギー密度(大きさ及び温度)の制御性」や「雰囲気液体(溶媒)による化学反応の選択性」を有する新しい化学反応場を創生する。なお、その評価として、化学反応の核領域となるプラズマ界面における電界、電子温度・密度などの物理的パラメータ及び化学化合物の挙動などの化学的パラメータの計測に取り組む。平成23年度は、圧力を制御した液体・気体へレーザを照射することで、エネルギー密度を制御したプラズマを形成し、そのプラズマと雰囲気液体との界面における電界強度及び電子温度・密度などの物理的パラメータ、並びに、化学化合物の挙動などの化学的パラメータを探求することで、界面の物理的・化学的定義の導出を目指し、レーザブレークダウンプラズマによるインジゴカルミン水溶液の脱色という化学反応場の形成に成功した。しかしながら、インジゴカルミン溶液を高圧封入する容器の不具合より照射レーザ光のエネルギーを上げることが出来ず、結果としてレーザブレークダウンプラズマの活性度をその物理・化学的特性を把握するのに必要なレベルまで十分に上げることが出来なかった。

Research Products

• [Journal Article] Propagation of streamer heads during a 5 nanosecond pulsed discharge (2011)
  • Author(s): D.Wang, T.Namihira, H.Akiyama
  • Journal Title: IEEE Transactions on Plasma Science Volume: 39 Pages: 2268-2269
  • NAID: 120004898543
  • Peer Reviewed
• [Journal Article] Discharge appearances of 2 and 5 ns pulsed power (2011)
  • Author(s): T.Matsumoto, D.Wang, T.Namihira, H.Akiyama
  • Journal Title: IEEE Transactions on Plasma Science Volume: 39 Pages: 2262-2263
  • Peer Reviewed
• [Journal Article] Streamer propagation of nanosecond pulse discharge with various rise times (2011)
  • Author(s): I.Yagi, S.Okada, T.Matsumoto, D.Wang, T.Namihira, K.Takaki
  • Journal Title: IEEE Transactions on Plasma Science Volume: 39 Pages: 2232-2233
  • Peer Reviewed
• [Journal Article] Process performances of 2 nano-seconds pulsed discharge plasma (2011)
  • Author(s): T.Matsumoto, D.Wang, T.Namihira, H.Akiyama
  • Journal Title: Japanese Journal of Applied Physics Volume: 50
  • Peer Reviewed
• [Journal Article] Spatiotemporal distribution of nitrogen rotational temperature during pulsed discharge in air (2011)
  • Author(s): S.Okada, D.Wang, T.Namihira, S.Katsuki, H.Akiyama
  • Journal Title: Japanese Journal of Applied Physics Volume: 50
  • NAID: 210000071063
  • Peer Reviewed
• [Journal Article] Energy transfer efficiency of nano-seconds pulsed power generator for nonthermal plasma processing technique (2011)
  • Author(s): D.Wang, M.Matsuda, T.Matsumoto, T.Namihira, H.Akiyama
  • Journal Title: IEEE Transactions on Dielectrics and Electrical Insulation Volume: 18 Pages: 1091-1096
  • Peer Reviewed
• [Journal Article] Recent progress of nano-seconds pulsed discharge and its applications (2011)
  • Author(s): D.Wang, T.Namihira, H.Akiyama
  • Journal Title: Journal of Advanced Oxidation Technologies Volume: 14 Pages: 131-137
  • Peer Reviewed
• [Journal Article] Energy efficiency improvement of nitric oxide treatment using nano-seconds pulsed discharge (2010)
  • Author(s): T.Matsumoto, D.Wang, T.Namihira, H.Akiyama
  • Journal Title: IEEE Transactions on Plasma Science Volume: 38 Pages: 2639-2643
  • NAID: 120006697177
  • Peer Reviewed
• [Journal Article] Pulsed discharge induce by nano-seconds pulsed power in atmospheric air (2010)
  • Author(s): D.Wang, S.Okada, T.Matsumoto, T.Namihira, H.Akiyama
  • Journal Title: IEEE Transactions on Plasma Science Volume: 38 Pages: 2746-2751
  • Peer Reviewed
• [Journal Article] 酸素原料オゾナイザにおけるパルス幅の影響 (2010)
  • Author(s): 岡田翔, 王斗艶, 浪平隆男, 勝木淳, 秋山秀典
  • Journal Title: 電気学会論文誌A Volume: 130 Pages: 825-830
  • NAID: 10026579524
  • Peer Reviewed
• [Presentation] Environmental application of nano-seconds pulsed discharge system (2011)
  • Author(s): T.Namihira, D.Wang, H.Akiyama
  • Organizer: 17th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil
  • Place of Presentation: San Diego, USA(招待講演)
  • Year and Date: 2011-10-08
• [Presentation] Phenol treatment by laser produced plasma in pressurized solution (2011)
  • Author(s): R.Tsuruga, K.Kohtake, S.Naka, D.Wang, T.Namihira, H.Akiyama
  • Organizer: 17th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil
  • Place of Presentation: San Diego, USA
  • Year and Date: 2011-10-07
• [Presentation] Higher yield ozone generation using nano-seconds pulsed discharge (2011)
  • Author(s): T.Namihira, D.Wang, T.Matsumoto, H.Akiyama
  • Organizer: 18th Symposium on Application of Plasma Processes
  • Place of Presentation: Hotel Boboty, Vratna, Mala Fatra, Slovakia
• [Presentation] Recent progress of nano-seconds pulsed discharge and its applications (2010)
  • Author(s): T.Namihira, D.Wang, H.Akiyama
  • Organizer: 16th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil
  • Place of Presentation: Town & Country Resort, San Diego, USA
• [Presentation] Performances of 2 ns pulsed discharge plasma (2010)
  • Author(s): T.Matsumoto, D.Wang, T.Namihira, H.Akiyama
  • Organizer: 3rd Euro-Asian Pulsed Power Conference and 18th International Conference on High-Power Particle Beams
  • Place of Presentation: ICC Jeju, Jeju, Korea
• [Presentation] Measurement of spatiotemporal gen temperature during pulsed discharge (2010)
  • Author(s): S.Okada, D.Wang, T.Namihira, S.Katsuki, H.Akiyama
  • Organizer: 63rd Gaseous Electronics Conference and 7th International Conference on Reactive Plasmas
  • Place of Presentation: Maison de la Chimie, Paris, France
• [Presentation] Efficient non-thermal plasma processing by 5 ns pulsed discharge (2010)
  • Author(s): T.Matsumoto, T.Namihira, H.Akiyama
  • Organizer: 63rd Gaseous Electronics Conference and 7th International Conference on Reactive Plasmas
  • Place of Presentation: Maison de la Chimie, Paris, France
• [Presentation] Discharge phenomena of nano-seconds pulsed discharge (2010)
  • Author(s): D.Wang, T.Matsumoto, S.Okada, T.Namihira, H.Akiyama
  • Organizer: 4th Japan/US Symposium on Pulsed Power and Plasma Applications
  • Place of Presentation: Sheraton Princess Kaiulani Hotel, Hawaii, USA
• [Presentation] Different discharge phenomena between general and nano-second pulsed discharges (2010)
  • Author(s): T.Namihira, D.Wang, T.Matsumoto, S.Okada, H.Akiyama
  • Organizer: 7th International Symposium on Non-Thermal/Thermal Plasma Pollution Control Technology & Sustainable Energy
  • Place of Presentation: Battery Hotel, St.John, Newfoundland, Canada