title: Effects of addition of supramolecular assembly on the anatase nanocrystalline precipitation of sol-gel derived SiO2-TiO2 coating films by hot-water treatment.
abstract: Effects of the addition of a supramolecular assembly of cetyltrimethylammonium bromide in SiO2-TiO2 gel films on the formation of anatase type TiO2 nanocrystals with hot-water treatment were investigated. Anatase nanocrystals were formed in the whole SiO2-TiO2 gel films with the addition of cetyltrimethylammonium bromide by the treatment, whereas the nanocrystals were formed only on the film surface in the case of gel films without cetyltrimethylammonium bromide. Cetyltrimethylammonium bromide molecules in the SiO2-TiO2 gel films were completely removed by the hot-water treatment and the following UV irradiation. In the usual procedure for preparation of porous materials, the removal of template molecular assemblies required high temperature treatment over 400 degrees C. In this system, all the processes were performed at temperatures less than 100 degrees C. Additionally, the porous structure produced by the removal of micellar assembly allowed anatase nanocrystals to be formed inside the films. Therefore, the method presented in this work provides us with the novel photocatalyst coatings of porous membrane with highly-dispersed TiO2 nanocrystals via low temperature process.
authors.affiliation: Department of Materials Science, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan.
authors.forename: Kiyofumi
authors.initials: K
authors.lastname: Katagiri
authors.forename: Genki
authors.initials: G
authors.lastname: Harada
authors.forename: Atsunori
authors.initials: A
authors.lastname: Matsuda
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Kogure
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Muto
authors.forename: Mototsugu
authors.initials: M
authors.lastname: Sakai
mesh_terms: D000077286:Cetrimonium; D002593:Cetrimonium Compounds; D003460:Crystallization; D006358:Hot Temperature; D008823:Micelles; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods; D010777:Photochemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014867:Water
chemical_list: D002593:Cetrimonium Compounds; D008823:Micelles; D014867:Water; C009495:titanium dioxide; D012822:Silicon Dioxide; D014025:Titanium; D000077286:Cetrimonium