A Study of Factors that Change the Wettability of Titania FilmsReport as inadecuate




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International Journal of PhotoenergyVolume 2008 2008, Article ID 470670, 6 pages

Research ArticleDepartment of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK

Received 25 July 2007; Accepted 3 January 2008

Academic Editor: Russell Howe

Copyright © 2008 Andrew Mills and Matthew Crow. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of several pretreatment methods on the wettability of polycrystalline titania-coated glass Pilkington Activ and plain glass are investigated. UV-ozone, immersion in aqua regia, and heating render both substrates superhydrophilic i.e., water contact angle CA. The dark recovery of the contact angles of these superhydrophilic substrates, monitored after treatment in either an evacuated or an ambient atmosphere, led to marked increases in CA. Ultrasound treatment of superhydrophilic Activ and glass samples produced only small increases in CA for both substrates, but rubbing the samples with a cloth produced much larger increases. The results of this study are discussed in the context of the current debate over the mechanism of the photo-induced superhydrophilic effect.





Author: Andrew Mills and Matthew Crow

Source: https://www.hindawi.com/



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