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Partial molal volumes of calcium-montmorillonite

Published online by Cambridge University Press:  09 July 2018

E. A. Ferreiro  and
A. K. Helmy
E. A. Ferreiro
Affiliation:
lnstituto de Edafologίa e Hidrologίa, Universidad National del Sur, Bahίa Blanca, Argentina
A. K. Helmy
Affiliation:
lnstituto de Edafologίa e Hidrologίa, Universidad National del Sur, Bahίa Blanca, Argentina
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Abstract

Partial molal voltmae of Ca-montmorillonite, apparent molal volume of silica gel in water and of Ca-montmorillonite in ethanol-water mixtures, were determined using pycnometer density measurements. No electrostriction of water was observed with silica gel but took place in Ca-montmorillonite thus indicating the principle role of surface charges in stricting water. In ethanol-water mixtures alcohol molecules were salted out at low alcohol concentration, but they started reaching inner zones near the clay surfaces when their mole fraction in solution was increased beyond the value of 0·55.

Type
Research Article
Information
Clay Minerals , Volume 9 , Issue 2 , December 1971 , pp. 177 - 184
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1971

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