AGGREGATION PROCESS IN SILICA AEROGELS ON SINTERING

Citation
N. Delarosafox et al., AGGREGATION PROCESS IN SILICA AEROGELS ON SINTERING, Journal of non-crystalline solids, 193, 1995, pp. 534-538
Citations number
12
Categorie Soggetti
Material Science, Ceramics
ISSN journal
00223093
Volume
193
Year of publication
1995
Pages
534 - 538
Database
ISI
SICI code
0022-3093(1995)193:<534:APISAO>2.0.ZU;2-Q
Abstract
The ultrastructural evolution of aerogels on sintering into glass must be understood on the basis of a detailed description of a solid backb one and porosity. Silica aerogels from 'sonogels' have been studied ov er a wide length-scale range, using small-angle X-ray scattering and g as adsorption measurements. An aggregation model of a hierarchical nat ure can be formulated with a variable clustering index (N is the numbe r of elementary units inside a cluster) and hierarchical ratio (size o f a cluster in terms of the size of the elementary unit). The results reveal a change in the hierarchical level during the sintering process , which is ultrasonic dose-dependent.