1. Photocatalyst activity indicating adhesive labels for use in the field.
- Author
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Mills, A., Hawthorne, D., Hazafy, D., and Wells, N.
- Subjects
- *
ADHESIVE labels , *PHOTOCATALYSIS , *RESAZURIN , *CATALYTIC activity , *TITANIUM dioxide , *SOL-gel processes - Abstract
The preparation and characterisation of a resazurin-based photocatalyst activity indicator label is described. The label is applied to a number of different TiO 2 -based, photocatalytic materials, including self-cleaning: glass, tile, paint and awning materials, as well as a thin, sol-gel film, produced in-house. In all cases, the label exhibited a blue to pink colour transition upon irradiation with UV light. In most cases, the time taken to bleach 90% of the red component of the digital image of the ink, ttb(90) , was twice that for a traditional Rz ink, produced by the drawdown method, since the former was twice as thick. Although not as fast as a drawdown Rz ink, by a factor of ca. Two, it still only takes minutes to change and the Rz label is much more easily used, stored and does not need the sample to be: very smooth, horizontal or flat. As such it appears ideal for testing samples, both quantitatively and qualitatively in situ , i.e. in the field. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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