九州大学 研究者情報
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基本情報 研究活動 教育活動 社会活動
田中 学(たなか まなぶ) データ更新日:2018.06.08

助教 /  工学研究院 化学工学部門 生産システム工学


主な研究テーマ
アーク放電現象および電極現象の可視化
キーワード:アーク放電現象,変動現象,電極現象,可視化
2010.04.
熱プラズマを利用したナノ材料合成プロセスの構築
キーワード:熱プラズマ,大気圧プラズマ,ナノ粒子合成,プラズマ化学
2006.04.
研究業績
主要原著論文
1. Manabu Tanaka, Takayuki Watanabe, Vaporization mechanism from Sn-Ag mixture by Ar-H2 Arc for nanoparticle preparation, Thin Solid Films, https://doi.org/10.1016/j.tsf.2007.11.096, 516, 19, 6645-6649, 2008.08, The purpose of this paper was to describe the synthesis of Sn-Ag nanoparticles by an arc plasma method. Sn-Ag nanoparticles have been successfully prepared by DC arc plasma with hydrogen addition. The prepared nanoparticles were characterized by X-Ray diffraction, transmission electron microscopy and inductively coupled plasma-atomic emission spectrometry. The obtained results indicated that the nanoparticles have high-purity and spherical shape. The average diameter of the nanoaprticles with 100%-Ar arc was 19.8 nm and that with 50%-H2 arc was 56.5 nm. Another purpose of this work is to investigate the vaporization behavior from molten Sn-Ag mixture with Ar and Ar-H2 arc. We confirmed the vaporization enhancement of Sn from Sn-Ag mixture by hydrogen in arc plasma..
2. Manabu Tanaka, Taro Hashizume, Koki Saga, Tsugio Matsuura, Takayuki Watanabe, Diode-rectified multiphase AC arc for the improvement of electrode erosion characteristics, Journal Physics D: Applied Physics, https://doi.org/10.1088/1361-6463/aa8cac, 50, 46, 2017.10, An innovative multiphase AC arc (MPA) system was developed on the basis of a diode-rectification technique to improve electrode erosion characteristics. Conventionally, electrode erosion in AC arc is severer than that in DC arc. This originated from the fact that the required properties for the cathode and anode are different, although an AC electrode works as the cathode and the anode periodically. To solve this problem, a separation of AC electrodes into pairs of thoriated tungsten cathode and copper anode by diode-rectification was attempted. A diode-rectified multiphase AC arc (DRMPA) system was then successfully established, resulting in a drastic improvement of the erosion characteristics. The electrode erosion rate in the DRMPA was less than one-third of that in the conventional MPA without the diode rectification. In order to clarify its erosion mechanism, electrode phenomena during discharge were visualized by a high-speed camera system with appropriate band-pass filters. Fluctuation characteristics of the electrode temperature in the DRMPA were revealed..
主要総説, 論評, 解説, 書評, 報告書等
主要学会発表等
1. Manabu Tanaka, Kohki Saga, Taro Hashizume,Tsugio Matsuura, Takayuki Watanabe, Improvement of Electrode Erosion Characteristics in Diode-Rectified Multiphase AC Arc, 23rd International Symposium on Plasma Chemistry, 2017.07, An innovative multiphase AC arc was drastically improved by diode-rectification technique. Conventionally, electrode erosion in AC arc originates from a lack of suitable electrode material because required properties for cathode and anode are different. To solve this problem, separation of AC electrodes into pairs of cathode and anode by diode-rectification was attempted. Diode-rectified MPA was then successfully established and erosion characteristics were drastically improved..
2. 田中学, 曽根宏隆, 渡辺隆行, Liイオン電池関連の熱プラズマ技術, 第64回応用物理学会春季学術講演会, 2017.03.
3. Tanaka Manabu, Yuji Nawata, Tomoyuki Imatsuji, Takayuki Watanabe, Dynamic Behavior of Metal Oxide Vapors in Multiphase AC Arc during Oxide Nanoparticle Fabrication Process, 26th Symposium of The Materials Research Society of Japan, 2016.12.
4. Manabu Tanaka, Taro Hashizume, Tomoyuki Imatsuji, Yushi Nawata, Takayuki Watanabe, High-Speed Visualization of Evaporation Phenomena from Tungsten Based Electrode in Multi-Phase AC Arc, 9th International Conference on Reactive Plasmas, 2015.10.
5. Taro Hashizume, Manabu Tanaka, Takayuki Watanabe, Droplet Ejection Mechanism from Tungsten Electrode in Multi-Phase AC Arc by High-Speed Visualization, 22nd International Symposium on Plasma Chemistry, 2015.07.
6. Manabu Tanaka, Takayuki Watanabe, High-Speed Visualization of Electrode Phenomena in Thermal Plasma Processing, 5th International Conference on Microelectronics and Plasma Technology, 2014.07, A multi-phase AC arc has been developed to apply to innovative in-flight glass melting technology as a promising heat source because it possesses following advantages; the high energy efficiency, the large plasma volume, the low gas velocity, and so on. However, the understanding of multi-phase AC arc still remains to be improved for the practical use. In particular, electrode erosion is one of the most important issues to be solved. The purpose of this study is to investigate the electrode erosion mechanism of the multi-phase arc.
Multi-phase AC arc reactor mainly consisted of 12 electrodes, arc chamber, and AC power supply. The electrodes were made of tungsten (98 wt%) and thoria (2 wt%) with diameter of 6 mm. Argon shield gas was injected around the electrode to prevent them from the oxidation because the melting point of tungsten oxide is lower than that of metal tungsten. As the multi-phase arc discharge was generated under the atmospheric air except of the above mentioned argon, the plasma source gas was mainly air. The argon gas flow rate was changed to investigate the shield gas effect on the electrode erosion.
Combination of the high-speed camera and the band-pass filters system enables to measure the electrode temperature even during arc discharge, and to observe dynamic behavior of the vapors in the arc. In the present work, two synchronized high-speed cameras were applied to investigate the erosion mechanism. One of the systems was used to measure the electrode temperature, while another one was synchronized to observe the vapors in the arc.
The strong tungsten emission separated from the other emissions was successfully observed at the anodic period in the case of lower argon gas flow rate. Moreover, the synchronized temperature measurements revealed that the electrode tip temperature increased with decreasing the argon gas flow rate. This is because the discharge point was stabilized due to the constriction of arc in anodic period at the lower flow rate of shield gas. The droplet ejection from the molten electrode surface was also observed in the case of lower shield gas flow rate. The droplet ejection was contributed to the high electrode erosion of the multi-phase arc.
The high-speed visualization by the synchronized system of high-speed video cameras with appropriate band-pass filters is important to understand electrode phenomena during thermal plasma processing..
7. Manabu Tanaka, Tomoki Ikeba, Yaping Liu, Sooseok Choi, Takayuki Watanabe, Investigation on Electrode Erosion Mechanism of Multi-Phase AC Arc by High-Speed Camera Observation, 21st International Symposium on Plasma Chemistry, 2013.08.
8. Manabu Tanaka, Takayuki Watanabe, Metal Hydride Formation from Molten Metal Surface by Ar-H2 Arc, 10th Asia-Pacific Conference on Plasma Science and Technology, 2010.07.
特許出願・取得
特許出願件数  8件
特許登録件数  1件
学会活動
所属学会名
化学工学会
応用物理学会
プラズマ・核融合学会
学協会役員等への就任
2017.04~2019.03, 応用物理学会 プラズマエレクトロニクス分科会, 幹事.
2015.04~2017.03, 化学工学会 熱工学部会, 幹事.
学会大会・会議・シンポジウム等における役割
2019.01.15~2019.01.17, プラズマプロセシング研究会, 実行委員.
2017.09.20~2017.09.22, 化学工学会第49回秋季大会, シンポジウムオーガナイザー.
2016.12.17~2016.12.18, プラズマ・核融合学会 九州・沖縄・山口支部 第20回支部大会, 現地実行委員.
2016.09.06~2016.09.08, 化学工学会第48回秋季大会, 座長(Chairmanship).
2016.08.07~2016.08.10, 20th International drying Symposium, 実行委員.
2015.09.09~2015.09.11, 化学工学会第47回秋季大会, 座長(Chairmanship).
2015.03.26~2015.03.31, 7th International Symposium on Advanced Plasma Science and Its Applications for Nitrides and Nanomaterials, Session Co-Organizer.
2014.09.17~2014.09.19, 化学工学会第46回秋季大会, 現地実行委員.
2014.09.17~2014.09.19, 化学工学会第46回秋季大会, 座長(Chairmanship).
2014.07.08~2014.07.11, International Conference on Microelectronics and Plasma Technology 2014, 座長(Chairmanship).
2014.03.18~2014.03.20, 化学工学会第79年会, 座長(Chairmanship).
2013.09.16~2014.09.18, 化学工学会第45回秋季大会, 座長(Chairmanship).
2011.10.29~2011.10.30, 日本機械学会 熱工学コンファレンス, 座長(Chairmanship).
2011.09.14~2011.09.16, 化学工学会第43回秋季大会, 座長(Chairmanship).
学術論文等の審査
年度 外国語雑誌査読論文数 日本語雑誌査読論文数 国際会議録査読論文数 国内会議録査読論文数 合計
2017年度
2016年度
2015年度
2014年度
2013年度
その他の研究活動
海外渡航状況, 海外での教育研究歴
Jeju National University, Korea, 2016.06~2016.06.
University of Minnesota, UnitedStatesofAmerica, 2008.07~2008.12.
受賞
Junior Researcher Award, Japan Congress on High-Speed Imaging and Photography, 2017.11.
プラズマプロセシング研究会講演奨励賞, 公益社団法人 応用物理学会 プラズマエレクトロニクス分科会, 2017.01.
ISPC22 Poster Award, International Plasma Chemistry Society, 2015.07.
プラズマ・核融合学会 九州・沖縄・山口支部大会 講演奨励賞, プラズマ・核融合学会 九州・沖縄・山口支部, 2015.03.
化学工学会第44回秋季大会 粒子流体プロセス部会シンポジウム奨励賞, 化学工学会 粒子流体プロセス部会, 2012.09.
研究資金
科学研究費補助金の採択状況(文部科学省、日本学術振興会)
2015年度~2017年度, 若手研究(B), 代表, 新規な熱プラズマ反応場「多相交流アーク」による非白金系触媒ナノ粒子の創製.
競争的資金(受託研究を含む)の採択状況
2016年度~2016年度, JAXA宇宙探査イノベーションハブ, 分担, 月土壌の水素還元システムの構築 -低品位原料の工業的利用を目指して-.
共同研究、受託研究(競争的資金を除く)の受入状況
2013.04~2013.09, 代表, 可視光光触媒材料の合成.
寄附金の受入状況
2013年度, 福伸工業株式会社, 奨学寄附金.
学内資金・基金等への採択状況
2017年度~2017年度, エネルギー研究教育機構 若手研究者・博士課程学生支援プログラム, 代表, 新規な熱プラズマ場「多相交流アーク」中の電極蒸気を原料とした燃料電池触媒として用いる遷移金属酸窒化物ナノ粒子の創製.
2015年度~2015年度, 工学研究院若手研究者助成, 代表, 新規な熱プラズマ発生手法を用いた機能性窒化物ナノ粒子の創製.
2014年度~2014年度, 工学研究院若手研究者助成, 代表, 多相交流アークの電極現象の解明.

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