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Effect of alkali cation on irreversible gel formation in basic medium

Abstract : This study is based on the understanding of the behavior of alkali silicates in a basic medium and aims to identify the mechanisms responsible for the formation of an irreversible gel and its consolidation. Commercial lithium, sodium and potassium silicate solutions were used to reveal the effect of the cation nature on the gelation process. Gels are obtained by acidifying alkaline silicate solutions with hydrochloric acid. A syneresis phenomenon during ripening that leads to the formation of a strongly consolidated solid has been observed. Whatever the cation, the gelation or syneresis mechanism would be similar. However, gelation time decreases and syneresis increases with the cation size. Gelation results from formation of small particles which grow in number and size and then gather to fill the available space. Ripening takes place through a dissolution/precipitation mechanism.
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https://hal-unilim.archives-ouvertes.fr/hal-00632197
Contributeur : Sylvie Rossignol <>
Soumis le : jeudi 13 octobre 2011 - 16:47:12
Dernière modification le : lundi 22 janvier 2018 - 14:36:01

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Monique Tohoué Tognonvi, Sylvie Rossignol, Jean-Pierre Bonnet. Effect of alkali cation on irreversible gel formation in basic medium. Journal of Non-Crystalline Solids, Elsevier, 2011, 357 (1), pp.43-49. ⟨10.1016/j.jnoncrysol.2010.10.003⟩. ⟨hal-00632197⟩

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