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Proceedings Paper

Effects of vacuum on photocatalytic activity of TiO2
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Paper Abstract

Contamination outgassed from spacecraft's materials can degrade optical devices in orbit. Therefore, solving the contamination problem is important because it in uences the success of spacecraft missions. In this study, methyl red (MR) and oleamide were decomposed in vacuum by TiO2 photocatalyst. Absorbance spectra, mass decrease and GC/MS were measured after and before decomposition. In vacuum, TiO2 could decompose MR to intermediate products, whereas it could not decompose the intermediate products to volatile substances because TiO2 cannot open benzene rings of the intermediate products. On the other hand, TiO2 could decompose oleamide to volatile substances even in vacuum. However, decomposition by TiO2 stopped after a certain period of time in vacuum. The decrease in mass for oleamide by photocatalytic reaction in vacuum was enough compared to standard molecular contamination levels.

Paper Details

Date Published: 19 September 2018
PDF: 8 pages
Proc. SPIE 10748, Systems Contamination: Prediction, Control, and Performance 2018, 1074810 (19 September 2018); doi: 10.1117/12.2320500
Show Author Affiliations
N. Shimosako, Sophia Univ. (Japan)
T. Egashira, Sophia Univ. (Japan)
K. Yoshino, Sophia Univ. (Japan)
K. Shimazaki, Japan Aerospace Exploration Agency (Japan)
E. Miyazaki, Japan Aerospace Exploration Agency (Japan)
H. Sakama, Sophia Univ. (Japan)

Published in SPIE Proceedings Vol. 10748:
Systems Contamination: Prediction, Control, and Performance 2018
Carlos E. Soares; Eve M. Wooldridge; Bruce A. Matheson, Editor(s)

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