Nano‐TiO 2 ‐Coated Unidirectional Porous Glass Structure Prepared by Freeze Drying and Solution Infiltration
2007; Wiley; Volume: 90; Issue: 4 Linguagem: Inglês
10.1111/j.1551-2916.2007.01602.x
ISSN1551-2916
AutoresZhen‐Yan Deng, Hugo R. Fernandes, J.M.G. Ventura, S. Kannan, J.M.F. Ferreira,
Tópico(s)TiO2 Photocatalysis and Solar Cells
ResumoA unidirectional porous glass structure coated with a nanometer TiO 2 thin film on pore walls was successfully fabricated by a two‐step process. Firstly, a water‐based slurry of sheet glass was frozen while controlling the growth direction of ice crystals, and then sublimation of the ice under vacuum formed the green body. The green body was subsequently sintered to produce porous glass with unidirectional pores. Secondly, the sintered porous glass was infiltrated by a titanium (IV) butoxide solution, and then dried and calcined at a moderate temperature to generate a nanometer TiO 2 film on pore walls. The present porous glass with nanometer TiO 2 has more total surface area than the TiO 2 film on glass plates, which is believed to be more effective in the phtotocatalysis application for air or water purification.
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