Hydrolytic stability of sodium silicate gels in the presence of aluminum

Giannopoulou, I; Panias, D

dc.contributor.author	Giannopoulou, I	en
dc.contributor.author	Panias, D	en
dc.date.accessioned	2014-03-01T01:33:36Z
dc.date.available	2014-03-01T01:33:36Z
dc.date.issued	2010	en
dc.identifier.issn	0022-2461	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20488
dc.subject	Ambient Temperature	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Alkali silicates	en
dc.subject.other	Aluminum addition	en
dc.subject.other	Ambient temperatures	en
dc.subject.other	Aqueous environment	en
dc.subject.other	Geopolymerization	en
dc.subject.other	Hydrolytic stability	en
dc.subject.other	Molar ratio	en
dc.subject.other	Sodium silicate gel	en
dc.subject.other	Aluminum	en
dc.subject.other	Deionized water	en
dc.subject.other	Gels	en
dc.subject.other	Inorganic polymers	en
dc.subject.other	Polycondensation	en
dc.subject.other	Silicates	en
dc.subject.other	Sodium	en
dc.title	Hydrolytic stability of sodium silicate gels in the presence of aluminum	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s10853-010-4586-1	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s10853-010-4586-1	en
heal.language	English	en
heal.publicationDate	2010	en
heal.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 SiO 2/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. © 2010 Springer Science+Business Media, LLC.	en
heal.publisher	SPRINGER	en
heal.journalName	Journal of Materials Science	en
dc.identifier.doi	10.1007/s10853-010-4586-1	en
dc.identifier.isi	ISI:000280597600031	en
dc.identifier.volume	45	en
dc.identifier.issue	19	en
dc.identifier.spage	5370	en
dc.identifier.epage	5377	en