2020 Fiscal Year Final Research Report
Development of photocatalysts that can work for a long time in vacuum for decontamination of spacecraft
| Project/Area Number |
19K15211
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 24010:Aerospace engineering-related
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| Research Institution | Sophia University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2021-03-31
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| 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 |
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| 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
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| Free Research Field |
コンタミネーション
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| 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．
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