Effects of vacuum on photocatalytic activity of TiO2

N. Shimosako; T. Egashira; K. Yoshino; K. Shimazaki; E. Miyazaki; H. Sakama

doi:10.1117/12.2320500

19 September 2018 Effects of vacuum on photocatalytic activity of TiO₂

N. Shimosako, T. Egashira, K. Yoshino, K. Shimazaki, E. Miyazaki, H. Sakama

Proceedings Volume 10748, Systems Contamination: Prediction, Control, and Performance 2018; 1074810 (2018) https://doi.org/10.1117/12.2320500
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

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.

Citation Download Citation

N. Shimosako, T. Egashira, K. Yoshino, K. Shimazaki, E. Miyazaki, and H. Sakama "Effects of vacuum on photocatalytic activity of TiO₂", Proc. SPIE 10748, Systems Contamination: Prediction, Control, and Performance 2018, 1074810 (19 September 2018); https://doi.org/10.1117/12.2320500

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available