SANS Study of the Aging of xTiO(2)-SiO2 Gels

被引：4

作者：

Salvado, I. M. Miranda ^{[1
]}

Margaica, F. M. A. ^{[2
]}

Teixeira, J. ^{[3
]}

机构：

[1] Univ Aveiro, Dept Engn Ceram & Vidro, P-3800 Aveiro, Portugal

[2] ICEN INETI, Dept Fis, P-2686 Saccvem, Portugal

[3] CE Saclay, Lab Leon Brillouin CNRS CEA, F-91191 Gif Sur Yvette, France

来源：

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 1994年 / 2卷 / 1-3期

关键词：

aging; SANS; gels; silica-titania;

D O I：

10.1007/BF00486258

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：

Silica-titania gels, prepared in acidic conditions, with contents of TiO2 up to 6 mol%, have been studied by small angle neutron scattering (SANS) as wet gel with increasing aging times. In all samples, small primary particles have been found with a diameter of about 3 nm. At the gel point, cylindrical clusters, ca. 10 nm long, were observed as well. These grow with aging time, becoming branched. The cluster-cluster diffusion limited aggregation model is found to be consistent with the SANS results. The growth process is independent of the TiO2 content. It is mainly influenced by the ratio of the aging time to the gelation time.

引用

页码：289 / 294

页数：6

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