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The Microstructure of Three Na+ Smectites: The Importance of Particle Geometry on Dehydration and Rehydration

Published online by Cambridge University Press:  28 February 2024

Frederic Hetzel ,
Daniel Tessier ,
Anne-Marie Jaunet  and
Harvey Doner
Frederic Hetzel
Affiliation:
Department of Soil Science, University of California at Berkeley, Berkeley, California 94720
Daniel Tessier
Affiliation:
Institut National de la Recherche Agronomique, Versailles, France
Anne-Marie Jaunet
Affiliation:
Institut National de la Recherche Agronomique, Versailles, France
Harvey Doner
Affiliation:
Department of Soil Science, University of California at Berkeley, Berkeley, California 94720
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Abstract

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Recent pedological evidence of the widespread distribution of beidellites in soils indicates the need for a greater knowledge of the effect of charge location on the microstructural organization of Na+ smectite in gels. After equilibration at a suction pressure of 3.2 kPa before and after desiccation, TEM observations showed large differences between a beidellite and both a low and high charge montmorillonite. Monolayers were rare; individual layers were instead organized in particles with larger interparticle distances. This has implication for theories relating swelling pressures to interlayer distances or surface areas and implies the need for a geometrical approach to the study of swelling in smectites. Location of isomorphous substitution in the tetrahedral sheet of smectites results in an increased lateral extension of overlapping layers. This was reflected in a greater capacity to rehydrate after desiccation. Increased number of layers in particles were found with increasing surface charge density. The geometric organization of the particles is critical to the understanding of the ability of Na+ smectite to hold water against an applied suction.

Keywords

BeidelliteLayer chargeMicrostructureMontmorilloniteParticleSmectiteTEM
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 3 , June 1994 , pp. 242 - 248
Copyright
Copyright © 1994, Clay Minerals Society

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