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- W1973228946 abstract "The investigation of macroscopic interfacial phenomena, the adsorption layer structure and the nature of the interactions between a solid surface and surfactant molecules and between molecules in the adsorbed state has led to the development of calorimetric methods in adsorption studies. The adsorption of non-ionic, cationic and zwitterionic surfactants onto the hydrophilic surface of silica gel has been studied by classical methods and particularly by batch calorimetry. The adsorption process for three groups of surfactants has been described by differential molar enthalpies for a wide range of coverages. The calorimetric results indicate that the mechanism of adsorption of the surfactants is composed of several sequential adsorption steps, which can already be qualitatively observed from the isotherms and electrophoretic data. The curves of the differential molar heats of adsorption show the existence of at least two kinds of interaction between the surfactant molecules and the silica surface. The first is due to a direct interaction between the polar part of the molecules and the surface sites (exothermic effect) and the second results from interactions between the hydrophobic chains, leading to the formation of interfacial aggregates. The main driving forces for the formation of these aggregates are of the same nature as those for the formation of micelles in the bulk solution. This paper presents numerous calorimetric experimental data which facilitate a better understanding of the adsorption mechanism." @default.
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- W1973228946 date "1993-09-01" @default.
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- W1973228946 title "Aggregate formation at the solid—liquid interface: The calorimetric evidence" @default.
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- W1973228946 doi "https://doi.org/10.1016/0927-7757(93)80087-u" @default.
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