Abstract
AbstractThe viscosity and light transmittance of montmorillonite suspensions saturated with Na+, Ca++ and known mixtures of these ions in the adsorbed phase were investigated. Introduction of a small fraction of Na+ (10% – 15%) into the exchange complex of Ca—clay, does not result in the breakdown of the tactoids. The breakdown of the tactoids occurred when the equivalent fraction of Na increased from 0.2 to 0.5. Montmorillonite clay saturated with 50% calcium (and less) exists as single platelets. Combining the structural data with an equilibrium equation based on the diffuse double layer theory indicates that when tactoids are formed, demixing occurred by which Na+ ions are concentrated on the external surfaces of the tactoids and Ca++ ions on the internal surfaces.
Published Version
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