POLYMERIC-SILICA-BASED SOLS FOR MEMBRANE MODIFICATION APPLICATIONS - SOL-GEL SYNTHESIS AND CHARACTERIZATION WITH SAXS

Citation
Rsa. Delange et al., POLYMERIC-SILICA-BASED SOLS FOR MEMBRANE MODIFICATION APPLICATIONS - SOL-GEL SYNTHESIS AND CHARACTERIZATION WITH SAXS, Journal of non-crystalline solids, 191(1-2), 1995, pp. 1-16
Citations number
27
Categorie Soggetti
Material Science, Ceramics
ISSN journal
00223093
Volume
191
Issue
1-2
Year of publication
1995
Pages
1 - 16
Database
ISI
SICI code
0022-3093(1995)191:1-2<1:PSFMMA>2.0.ZU;2-I
Abstract
Polymeric SiO2 and binary SiO2/TiO2, SiO2/ZrO2 and SiO2/Al2O3 sols, fo r ceramic membrane modification applications, have been prepared by ac id-catalyzed hydrolysis and condensation of alkoxides in alcohol. The sols were characterized with small angle X-ray scattering, using synch rotron radiation. Directly after synthesis, the sols were found to con sist of weakly branched polymeric structures with typical fractal dime nsions of around 1.5 and radii of gyration of approximate to 2 nm. The aggregation for silica sols obeys the tip-to-tip cluster-cluster aggr egation model in the initial stages. Prehydrolysis of TEOS was found t o be the best method to synthesize polymeric binary systems. Based on an analysis of film formation from sols consisting of weakly branched polymers, it is expected that consolidation of these polymers will res ult in microporous materials.