Synthesis of Neutral - Hydrosol and Its Application as Antireflective Self-Cleaning Thin FilmReportar como inadecuado

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International Journal of PhotoenergyVolume 2012 2012, Article ID 620764, 8 pages

Research Article

Institute of Environmental Engineering, National Chiao Tung University, Hsinchu 300, Taiwan

Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan

Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei City 106, Taiwan

Received 25 January 2012; Accepted 27 February 2012

Academic Editor: Xuxu Wang

Copyright © 2012 Chiahung Huang et al. 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.


A neutral SiO2-TiO2 composite hydrosol was prepared by a coprecipitation-peptization method using titanium tetrachloride and silicon dioxide hydrosol as precursors. It is not only an antireflective self-cleaning coating material but also an environmental-benign material. Even heated at 700°C for 5 minutes in the tempering process, the as-prepared SiO2-TiO2 thin film still demonstrated antireflection and photocatalytic self-cleaning effect. The SiO2-TiO2 thin film increased near 2% of transmittance; however, the TiO2 thin film decreased 5% of transmittance at least. In addition to antireflection, the SiO2-TiO2 thin film decomposed the surface coated oleic acid under ultraviolet light and showed superhydrophilicity under dark for two days. The SiO2-TiO2 thin film also showed good photocatalytic degradation of methylene blue. With these antireflection, persistent superhydrophilicity, and photocatalytic self-cleaning effects, this prepared neutral SiO2-TiO2 hydrosol would be a good coating material for tempered glass and other building materials.

Autor: Chiahung Huang, Hsunling Bai, Yaoling Huang, Shuling Liu, Shaoi Yen, and Yaohsuan Tseng



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