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Thermodynamic Properties of Water in Suspensions of Montmorillonite

Published online by Cambridge University Press:  01 January 2024

Jack H. Kolaian  and
Philip F. Low
Jack H. Kolaian*
Affiliation:
Purdue University, Lafayette, Indiana, USA
Philip F. Low
Affiliation:
Purdue University, Lafayette, Indiana, USA
*
2Exploration and Production Research Division, Texaco Inc., Bellaire, Texas
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Abstract

The partial molar free energies, entropies and heat contents of the water in suspensions of Li-, Na-, and K-clay were measured relative to pure water by means of a tensiometer. This method of obtaining these thermodynamic properties is far more sensitive than the more common method utilizing adsorption isotherms and a form of the Clausius-Clapeyron equation. The partial molar free energy of the water decreased with time after stirring and increased rapidly upon stirring. This was taken as evidence that a gradual increase in the degree of orientation of water molecules associated with the clay particles occurred as the particles fell into the more random edge-to-surface thixotropic structure. The partial molar entropies and heat contents of the water in the suspensions were found to be less than those for pure water. Hence, this evidence also supported the postulate that an ordered water structure exists in the thixotropic suspensions.

Type
Symposium on the Engineering Aspects of the Physico-Chemical Properties of Clays
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 9 , February 1960 , pp. 71 - 84
Copyright
Copyright © The Clay Minerals Society 1960

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Footnotes

1

Published as Journal Paper 1838, Purdue University Agricultural Experiment Station. Contribution from the Agronomy Department.

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