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Development of photocatalysts that can work for a long time in vacuum for decontamination of spacecraft

Research Project

Project/Area Number 19K15211
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 24010:Aerospace engineering-related
Research InstitutionSophia University

Principal Investigator

Shimosako Naoki  上智大学, 理工学部, 研究員 (80838095)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords宇宙機 / コンタミネーション / 汚染 / 光触媒 / 真空 / 窒化ガリウム / ジルコニア / 二酸化チタン / コンタミ
Outline of Research at the Start

本申請の目的は,真空環境下で長期間機能する光触媒の開発である.
軌道上において,宇宙機材料から放出された有機物が光学機器に付着し,宇宙機からの光学測定による測定値強度が時間とともに低下することが報告されている.付着した汚染物質を軌道上で取り除くために,申請者は「光触媒」に着目した.真空環境下でTiO2光触媒は汚染物質を分解し,TiO2表面から汚染物質を取り除くことができた.しかし,真空環境下では分解速度が徐々に低下し,約1日で分解が停止することが明らかとなった.より長期間機能する光触媒を開発するために,真空環境下で分解が停止する原因を明らかにし,真空環境下で長期間機能する光触媒を開発する.

Outline of Final Research Achievements

In order to apply photocatalysis to the contamination control of spacecrafts, we conducted a degradation experiment of methyl red by titanium dioxide to elucidate the cause of the decrease in photocatalytic activity under vacuum condition. As a result, we found that the photocatalytic activity decreases under vacuum condition due to the lack of reactive oxygen species and the absence of radical chains of oxygen molecules.
We also evaluated the photocatalytic activity using quartz crystal microbalance and the basic photocatalytic activity of gallium nitride and zirconia. We succeeded in evaluating the photocatalytic activity based on the mass loss of contaminants using quartz crystal microbalance, and found that the photocatalytic activity of gallium nitride was comparable to that of titanium dioxide and that of zirconia was 10 times higher than that of titanium dioxide

Academic Significance and Societal Importance of the Research Achievements

真空環境下で光触媒活性が低下する原因解明は,真空環境下でより長期間動作する光触媒の開発に貢献できると考える.また,水晶振動子マイクロバランスを用いた光触媒活性の評価は,宇宙機用光触媒の光触媒活性評価の標準的な手法となると考えられるため,今後の宇宙機用光触媒の開発を加速させると考える.窒化ガリウムとジルコニアの基本的な光触媒活性の評価は,これまで地上では利用されてこなかった光触媒材料の宇宙利用の可能性を見出した.これらの成果は,宇宙航空の分野のみならず,光触媒の分野にも貢献したと考える.

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (9 results)

All 2021 2020 2019

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Quantum efficiency of photocatalytic activity by GaN films2021

    • Author(s)
      N. Shimosako, H. Sakama
    • Journal Title

      AIP Advances

      Volume: 11 Issue: 2 Pages: 025019-025019

    • DOI

      10.1063/5.0035628

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Influence of vacuum environment on photocatalytic degradation of methyl red by TiO2 thin film2021

    • Author(s)
      N. Shimosako, H. Sakama
    • Journal Title

      Acta Astronautica

      Volume: 178 Pages: 693-699

    • DOI

      10.1016/j.actaastro.2020.10.003

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Mass decrease in contaminants by photocatalytic decomposition of TiO2 in vacuum2020

    • Author(s)
      N. Shimosako, M. Katoh, and H. Sakama
    • Journal Title

      Proc. SPIE

      Volume: 11489 Pages: 26-26

    • DOI

      10.1117/12.2567604

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Tolerance to electron beams of TiO2 film photocatalyst2019

    • Author(s)
      N. Shimosako, K. Yoshino, K. Shimazaki, E. Miyazaki, and H. Sakama
    • Journal Title

      Thin Solid Films

      Volume: 686 Pages: 137421-137421

    • DOI

      10.1016/j.tsf.2019.137421

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Mass Decrease in Contaminants by Photocatalytic Decomposition of TiO2 in Vacuum2020

    • Author(s)
      N. Shimosako, M. Katoh, and H. Sakama
    • Organizer
      SPIE Optical Engineering + Applications
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ZrO2薄膜の基礎光触媒活性の評価2020

    • Author(s)
      下迫直樹, 坂間弘
    • Organizer
      第64回宇宙科学技術連合講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 真空環境におけるTiO2光触媒による汚染物質の重量減少2020

    • Author(s)
      加藤幹大, 下迫直樹, 坂間弘
    • Organizer
      応用物理学会2020年春季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Decomposition of Oleamide by TiO2 Photocatalyst in Vacuum2019

    • Author(s)
      N. Shimosako, K. Shimazaki, E. Miyazaki, and H. Sakama
    • Organizer
      32nd International Symposium on Space Technology and Science
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] TiO2光触媒による汚染物質の重量減少2019

    • Author(s)
      下迫直樹, 吉野光祐, 加藤幹大, 坂間弘
    • Organizer
      第63回宇宙科学技術連合講演会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2022-01-27  

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