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Heat Capacities of Kaolinite From 7 to 380 K and of DMSO-Intercalated Kaolinite from 20 to 310 K. The Entropy of Kaolinite Al2Si2O5(OH)4

Published online by Cambridge University Press:  02 April 2024

Richard A. Robie  and
Bruce S. Hemingway
Richard A. Robie
Affiliation:
MS 959, National Center U.S. Geological Survey, Reston, Virginia 22092
Bruce S. Hemingway
Affiliation:
MS 959, National Center U.S. Geological Survey, Reston, Virginia 22092
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Abstract

The heat capacities of kaolinite (7 to 380 K) and of dimethyl sulfoxide (DMSO) intercalated kaolinite (20 to 310 K) were measured by adiabatically shielded calorimetry. The third law entropy of kaolinite, S298, is 200.9 ± 0.5 J·mol−1K−1.

The “melting point” of the DMSO in the intercalate, 288.0 ± 0.2 K, is 3.7 K lower than that of pure DMSO, 291.67 K. The heat capacity of DMSO in the intercalate above 290 K is approximately 5.2 J·mol−1·K−1 smaller than that of pure liquid DMSO at the same temperature.

Keywords

KaoliniteHeat capacityEntropySpecific heatDMSO:kaolinite
Type
Research Article
Information
Clays and Clay Minerals , Volume 39 , Issue 4 , August 1991 , pp. 362 - 368
Copyright
Copyright © 1991, The Clay Minerals Society

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