Patra, Amitava and Ganguli, Dibyendu (1994) Role of dopant cations in the gelation behavior of silica sols. Bulletin of Materials Science, 17 (6). pp. 999-1004. ISSN 0250-4707

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Abstract

Gelation times of tetraethyl orthosilicate-derived sols containing selected di- to tetravalent cations as dopants were noted at different temperatures (15 degrees-50 degrees C). An analysis of these data, in conjunction with relevant published information, led to the tentative conclusions that (i) unhydrolyzed cations in bare form linked negatively charged silicate polymers in sols, thereby accelerating gelation and (ii) hydrolyzed cations retarded the process by offering molecular size-related hindrance and competition for the available water for hydrolysis.

Item Type:	Article
Subjects:	Crystal Chemistry, Thermodynamics, Phase Equilibria
Divisions:	Sol Gel
Depositing User:	Bidhan Chaudhuri
Date Deposited:	08 Aug 2013 13:25
Last Modified:	21 Apr 2015 10:02
URI:	http://cgcri.csircentral.net/id/eprint/1979

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