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Journal of Materials Science
Published in: Journal of Materials Science 19/2010

01-10-2010

Hydrolytic stability of sodium silicate gels in the presence of aluminum

Authors: I. Giannopoulou, D. Panias

Published in: Journal of Materials Science | Issue 19/2010

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Abstract

Polycondensation in alkali silicate solutions comprises a fundamental process of the geopolymerization technology. Previous works had shown that the hydrolytic stability of sodium silicate gels depends on the SiO2/Na2O ratio. Sodium silicate gels totally insoluble in water can be produced at SiO2/Na2O molar ratios higher than 4.4. This article aims at elucidating the effect of tetra-coordinated aluminum addition on the hydrolytic stability of sodium silicate gels. According to the results, the aluminum addition stabilizes the sodium silicate gels in an aqueous environment. A sodium silicate gel with SiO2/Na2O molar ratio 3.48, which is totally soluble in deionized water at ambient temperature, can be transformed to insoluble sodium hydroaluminosilicates with the addition of tetrahedral aluminum at Al/Si molar ratios higher than 0.08. In addition, this article studies the structure of prepared sodium hydroaluminosilicates and draws very useful conclusions for the geopolymerization technology.
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Metadata
Title
Hydrolytic stability of sodium silicate gels in the presence of aluminum
Authors
I. Giannopoulou
D. Panias
Publication date
01-10-2010
Publisher
Springer US
Published in
Journal of Materials Science / Issue 19/2010
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-010-4586-1

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