Abstract
AbstractExcept for the region of very low surface coverages, the adsorption of cationic surfactants from their aqueous solutions onto negatively charged oxide surfaces is governed by the competition between monolayer‐like and bilayer‐like surfactant aggregates formed on the solid surface. That adsorption mechanism combines, thus, the features of both ion and polymer adsorption, and yet is influenced strongly by the energetic heterogeneity of the surfaces of the real oxides. — Starting from that adsorption model a theoretical approach is developed, making a quantitative description of experimental adsorption isotherms and heats of adsorption possible. Illustrative calculations are presented for DTAB adsorption on silica gel.
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