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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  and
P. S. Salvador
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
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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
Information
Clay Minerals , Volume 9 , Issue 2 , December 1971 , pp. 193 - 208
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1971

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References

Bibliographie

Barshad, I. (1952) Proc. Soil Sci. Soc. Am. 16, 176.Google Scholar
Cohn, E.J. & Edsal, J.T. (1953) Proteins, Aminoacidi and Peptides. (Reinhold Pubi. Corp.), p. 146. Am. Chem. Soc. Monograph Series n° 90. New York.Google Scholar
Norrish, K. (1954) Disc. Faraday Soc. 18, 120.CrossRefGoogle Scholar
Norrish, K. & Rausell-Colom, J.A. (1963) Clays Clay Miner. 10, 123.Google Scholar
Overbeek, J.T.H.G. & Sparnaay, M.J. (1954) Disc. Faraday Soc. 18, 12.CrossRefGoogle Scholar
Rausell-Colom, J.A. (1964) Trans. Faraday Soc. 60, 190.Google Scholar
Rausell-Colom, J.A. & Salvador Salvador, P. (1971) Clay Miner. 9, 139.Google Scholar
Salvador Salvador, P. (1968) These de Doctoral. Faculté des Sciences. Madrid. Google Scholar
Smith, E.R.B. & Smith, P.K.J. (1940) J. biol. Chem. 135, 273.Google Scholar
Stern, O. (1924) Z. Elektrochem. 30, 508.Google Scholar
Vervey, E.J.V. & Overbeek, J.T.H.G. (1948) Theory of the Stability ofLyophobic Colloids. Elsevier Co., New York.Google Scholar
Walker, G.F. & Garrett, W.G. (1961) Nature 191, 1389.Google Scholar