Lee, S-K. and Sheridan, M. and Mills, A. (2005) Novel UV-activated colorimetric oxygen indicator. Chemistry of Materials, 17 (10). pp. 2744-2751. ISSN 0897-4756Full text not available in this repository. (Request a copy from the Strathclyde author)
The results of a detailed characterization study of a novel UV-activated colorimetric oxygen indicator are described. The indicator uses nanoparticles of titania to photosensitize the reduction of methylene blue by triethanolamine in a polymer encapsulation medium, using UVA light. Upon UV irradiation, the indicator bleaches and remains in this colorless state in the dark, unless and until it is exposed to oxygen, whereupon its original color is restored. The indicator is reusable and irreversible. The rate of color recovery is proportional to the level of oxygen present. A layer of PET (poly(ethylene terephthalate)), of thickness b, placed on top of the indicator film slows down its response, and the 90% recovery time is proportional to b.
|Keywords:||methylene-blue, electron-transfer, ascorbic-acid, sensor, kinetics, water, film, Chemistry, Materials Chemistry, Chemical Engineering(all), Chemistry(all)|
|Subjects:||Science > Chemistry|
|Department:||Faculty of Science > Pure and Applied Chemistry
|Depositing user:||Mr Derek Boyle|
|Date Deposited:||09 Mar 2006|
|Last modified:||29 Apr 2016 07:47|