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Changes in the Properties of a Montmorillonite-Water System during the Adsorption and Desorption of Water: Hysteresis

Published online by Cambridge University Press:  02 April 2024

M. H. Fu ,
Z. Z. Zhang  and
P. F. Low
M. H. Fu
Affiliation:
Department of Agronomy, Purdue University, West Lafayette, Indiana 47907
Z. Z. Zhang
Affiliation:
Department of Agronomy, Purdue University, West Lafayette, Indiana 47907
P. F. Low
Affiliation:
Department of Agronomy, Purdue University, West Lafayette, Indiana 47907
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Abstract

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Samples of Na-saturated, Upton montmorillonite were prepared with different contents of water (H2O or D2O) by: (1) adsorption of water from the vapor phase at a specific value of p/p°, the relative humidity, (2) adsorption of water from the vapor phase at p/p° = 1.0 followed by desorption of the water into the vapor phase at a specific p/p° < 1.0, and (3) adsorption of water from the liquid phase followed by desorption of the water into the vapor phase at a specific p/p° < 1.0. Water adsorbed initially from the vapor phase was called V-adsorbed water, and water adsorbed initially from the liquid phase was called L-adsorbed water. The water contents of these samples were determined by gravimetric analysis, the c-axis spacings by X-ray powder diffraction, the O-D stretching frequencies by IR spectroscopy, and the heats of immersion by differential microcalorimetry. No difference was found between V-adsorbed and L-adsorbed water; however, if the final water content was established by adsorption, the system was in a different state than if the final water content was established by desorption. In particular, hysteresis was observed in the following properties: the relative humidity of the adsorbed water, the O-D stretching frequency in this water, and the degree of order in the stacking of the clay layers. The only property that did not exhibit hysteresis was the heat of immersion. Apparently, hysteresis occurred because the orderliness of the system was not reversible, and, thus, any property that depended on orderliness was hysteretic.

Keywords

AdsorptionDesorptionHysteresisInfrared spectroscopyMontmorilloniteVapor pressureWater
Type
Research Article
Information
Clays and Clay Minerals , Volume 38 , Issue 5 , October 1990 , pp. 485 - 492
Copyright
Copyright © 1990, The Clay Minerals Society

Footnotes

1

Journal Paper No. 12,056, Purdue University Agricultural Experiment Station.

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