Adsorption of interacting long chain surfactant molecules: isotherm equations
Date
1988
Authors
Koopal, L.K.
Wilkinson, G.T.
Ralston, J.
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Journal of Colloid and Interface Science, 1988; 126(2):493-506
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Abstract
A recently introduced lattice model for the adsorption of long-chain flexible ionic surfactants is briefly explained and generalized to describe the adsorption of both ionic and nonionic surfactants. To obtain analytical isotherm equations the general model is simplified by considering a stepwise segment density profile and a conformation in which m of the r segments are thought to be adsorbed in the first layer, whereas the remaining r - m segments protrude in the solution phase as a tail. Segment-segment and segment-solvent interactions are incorporated using the Flory-Huggins approach. The isotherm equations derived for both types of surfactants are very similar. Apart from the adsorption energy they show the effects of train size, chain length, solvent quality, and the specific nature of the head segments. Approximate expressions are given for the conformational entropy loss upon adsorption. For chains of one segment the equations reduce to the classical models. The isotherm equation for nonionic surfactants is an improvement of Kronberg's adsorption model. © 1988.
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Copyright 1988 Academic Press