Jr. Feldkamp et Tb. Stauffer, INTERACTIONS OF BINARY SOLVENTS WITH CHARGED EXPANDABLE CLAYS .1. THEORY, Journal of physical chemistry, 98(51), 1994, pp. 13594-13600
The interlayer space of fixed-charge, expandable, layered aluminosilic
ate clays is considered filled with a two-component dielectric solutio
n and treated as an open thermodynamic system. The composition of the
interlayer solution, relative to the external solution, is obtained by
performing a thermodynamic analysis that includes the work of polariz
ation of the dielectric solution. The theory predicts that composition
al changes are most dramatic when the component having greater polarit
y is present to a smaller extent (less than or equal to 20 mol %). Fur
thermore, the theory is shown to contribute significantly to the under
standing of previously published adsorption isotherm data as well as s
welling behavior of organo-clays in organic solvents.