By Ada Swineford
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Extra resources for Clays and Clay Minerals. Proceedings of the Ninth National Conference on Clays and Clay Minerals
The resultant entropy curve is in Fig. 4, and for comparison with the kaolinite entropy the lower pressure range is reproduced in Fig. 3. The remarkable similarity in the (Sa — Si) curves for H-kaolinite and Na-montmorillonite seems to confirm the suspicion that both these clays are contaminated with alumina. Barshad (1960) has investigated some thermodynamic functions for water sorbed on a number of montmorillonites saturated with various exchangeable ions. The preparation procedure was the same as that used by Mooney.
46 N I N T H NATIONAL CONFERENCE ON CLAYS AND CLAY MINERALS permeability decreases with increasing polarity of the permeant. The plots indicate that the Kozeny-Carman equation is obeyed over a considerable void ratio range for all permeants; however, deviations from the K o z e n y Carman relation occur for all permeants because none of the straight lines in Fig. 9 pass through the origin. —Kozeny-Carman coefficient, ^(k0) S, for various fluids through kaolinite beds as a function of void ratio (after Michaels and Lin, 1955).
Therefore, by the use of the water content just before a jump in c-axis spacing, the density calculated from X-ray data should be reliable to within a few percent. As seen in Fig. 1, the agreement between the ρ values calculated from the X-ray data of Norrish and the ρ values of Low show very satisfactory agreement. Méring (1946) did not observe the T A B L E 3 . — D E N S I T Y OF A D S O R B E D W A T E R CALCULATED FROM X - R A Y D A T A Experimental Data ^00/ (Â) Mooney et al. 99- See t e x t for method of computation.