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Gélification de vermiculite dans des solutions d'acide γ-aminobutyrique

Published online by Cambridge University Press:  09 July 2018

J. A. Rausell-Colom
Affiliation:
Instituto de Edafologia y Biologia Vegetal, C.S.I.C., Madrid, España
P. S. Salvador
Affiliation:
Instituto Geologico y Minero de España, Madrid

Abstract

Vermiculite single crystals swell to the gel state as a consequence of treatment with concentrated solutions of γ-aminobutyric acid.

The amount of swelling was determined, by measuring by X-ray diffraction the separation of the elementary silicate layers in the gel-like crystals.

By application of pressures into the gels along the swelling direction, a direct measure of the swelling pressure is obtained. The relation between swelling pressures and equilibrium interlayer distances is a function of both cationic concentration and dielectric constant of the solution. Measured swelling pressures are consistent with a model based on formation and interaction of diffuse double layers of aminoacid cations around the silicate particles, these having a Stern layer of an approximate thickness of 5 Å. The specific chemical adsorption potential of the system has been estimated as φ = 3·3 + 0·2 Kcal/mol.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1971

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References

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