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Charge densities and heats of immersion of some clay minerals

Published online by Cambridge University Press:  14 March 2018

R. Greene-Kelly
R. Greene-Kelly*
Affiliation:
Rothamsted Experimental Station, HarpendenHerts
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Abstract

The exchange capacities, surface areas (both external and total), and heats of immersion in water were measured on a selection of clay minerals and a fine-grained muscovite. The charge density (expressed as 103 X m-eq/m2) of muscovite was 3·6. This was, as expected, much higher than those of clay minerals which tended to group together, the average values being: kaolinites, 2·0; hydrous micas, 1·7; halloysites and montmorillonites, 1.4. The heats of immersion (expressed as J/m2) were, in contrast, more widely spread: muscovite, 0·63; halloysites and kaolinites, 0·49; hydrous micas, 0·28; montmorillonites, 0·14. The explanation advanced for the differences is that they reflect changes in surface energy and cohesion of the silicate layers.

Type
Research Article
Information
Clay Minerals Bulletin , Volume 5 , Issue 27 , July 1962 , pp. 1 - 8
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1962

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