Mass decrease in contaminants by photocatalytic decomposition of TiO2 in vacuum

Naoki Shimosako; Motohiro Kato; Hiroshi Sakama

doi:10.1117/12.2567604

21 August 2020 Mass decrease in contaminants by photocatalytic decomposition of TiO₂ in vacuum

Naoki Shimosako, Motohiro Kato, Hiroshi Sakama

Proceedings Volume 11489, Systems Contamination: Prediction, Control, and Performance 2020; 114890S (2020) https://doi.org/10.1117/12.2567604
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

It is reported that contaminants outgassed from these organic materials cause to degree the performance of optical systems mounted on spacecraft in orbit. We have been focusing on photocatalysts to solve this contamination problem. In this paper, photocatalytic activities of TiO₂ in vacuum were measured from frequency change of QCMs. The QCM frequencies increased during UV irradiation to TiO₂ on the QCM contaminated by oleamide and MR, which implied that TiO₂ can decompose oleamide and MR and their mass on TiO₂/QCM decreased in vacuum. We have succeeded to estimate photocatalytic activity from mass change. Moreover, this estimation method is effective to evaluate photocatalytic activity in vacuum.

Conference Presentation

Citation Download Citation

Naoki Shimosako, Motohiro Kato, and Hiroshi Sakama "Mass decrease in contaminants by photocatalytic decomposition of TiO₂ in vacuum", Proc. SPIE 11489, Systems Contamination: Prediction, Control, and Performance 2020, 114890S (21 August 2020); https://doi.org/10.1117/12.2567604

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