%0 Journal Article
%T Retarding Effect of Silica on the Growth and Anatase-to-Rutile Transformation of TiO2 Nanocrystals<br>氧化硅对二氧化钛纳米晶相变和晶粒生长的抑制作用
%A ZHANG Qing-Hong
%A GAO Lian
%A SUN Jing
%A <br>张青红
%A 高濂
%A 孙静
%J 无机材料学报
%D 2002
%I Science Press
%X By pre-hydrolysis of TEOS, Ti02/SiO2 composites with homogeneous texture were prepared by a sol-gel process. These composite powders were characterized by UV/Vis spectra, FT-IR, TEM, XRD, and BET techniques. It was found that the growth and anatase-to-rutile transformation of titania nanocrystals in the composite were retarded significantly in the presence of small amount of silica. Mesoporous TiO2 with high specific surface area and crystalline framework was obtained by selective dissolving of silica in composite. The fact that more than 90% of silica was removed after selective dissolving and the resulting TiO2 was mesoporous with mean pore size about 4nm suggested the network of ultrafine silica was continuous and uniform.
%K titanium dioxide
%K transformation
%K growth of nanocrystals
%K silica<br>二氧化硅
%K 二氧化钛
%K 纳米晶
%K 相变
%K 晶粒生长
%K 抑制作用
%K 光催化剂
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=ABC0063016AF57E1C73EF43C8D2212BD&aid=C7B12FF00033780E&yid=C3ACC247184A22C1&vid=BCA2697F357F2001&iid=38B194292C032A66&sid=BFB86B6ED3A99B9D&eid=65C08888CCE4801E&journal_id=1000-324X&journal_name=无机材料学报&referenced_num=28&reference_num=12