Rutile formation in hydrothermally crystallized nanosized titania

被引：104

作者：

Bacsa, RR ^{[1
]}

Gratzel, M ^{[1
]}

机构：

[1] SWISS FED INST TECHNOL,INST PHYS CHEM,CH-1015 LAUSANNE,SWITZERLAND

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1996年 / 79卷 / 08期

关键词：

D O I：

10.1111/j.1151-2916.1996.tb08956.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The present study shows that peptization aids in the anatase-rutile transformation in hydrothermally processed (250 degrees C, 4000 kPa) titania sols produced by the hydrolysis of alkoxide. HREM images show the presence of nanocrystals of 25-55 nm size, The anatase-rutile phase transformation in peptized titania is critically dependent on the conditions of hydrolysis such as the water/alkoxide concentration ratio and the size of the alkoxide. Hydrolysis of the ethoxide gave rise to a predominantly rutile phase whereas the isopropoxide and butoxide resulted in a predominantly anatase powder, under the same conditions of treatment, BET surface areas decrease from 107.1 to 68 m(2)/g when the alkoxide is changed from tert-butoxide to ethoxide for a given water/alkoxide ratio.

引用

页码：2185 / 2188

页数：4

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