Abstract
On the basis of surface tension measurements carried out at fixed ionic strength (0.1 M) at different temperatures, the changes of standard thermodynamic functions ( ΔG o , ΔS o , and ΔH o ) have been calculated for the adsorption from solutions containing equimolar quantities of decylpyridinium chloride and sodium alkylsulfonates with different lengths of the hydrocarbon chain. Applying the Gibbs adsorption equation, the surface excess values have also been calculated for both types of surface-active ions which are adsorbed from solutions containing equimolar quantities of anionic and cationic detergents. It has been found that in the case of mixtures of detergents of different hydrocarbon chain lengths, the adsorption films are enriched in the more surfaceactive component, which is particularly marked at low surface coverage.
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