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Electron microscopy study of n-butylammonium vermiculite swelling

Published online by Cambridge University Press:  09 July 2018

J. McCarney  and
M. V. Smalley
J. McCarney
Affiliation:
Physical Chemistry Laboratory, South Parks Road, Oxford OX13QZ, UK
M. V. Smalley
Affiliation:
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
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Abstract

Electron microscopy was used to study swollen samples of n-butylammonium vermiculite prepared in dilute aqueous solutions of n-butylammonium chloride. Three electrolyte concentrations were studied, 0.1 M, 0.01 M and 0.001 M. The 0.1 M samples studied were in a taetoid phase, exhibiting crystalline legions of about ten layers separated by large irregular aqueous regions. The dilute samples were studied in their gel phase, exhibiting regular spacings of 85 nm and 55 nm in the 0.001 M and 0.01 M solutions, respectively. These spacings are much larger than those measured previously by neutron scattering, probably due to an additional expansion of the interlayers during the freezing process employed in preparing the replicas. In all examples, the structures were found to be lamellar over regions of several microns.

Type
Research Article
Information
Clay Minerals , Volume 30 , Issue 3 , September 1995 , pp. 187 - 194
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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