Abstract
Data on the surface tension of sodium alkylsulfonate solutions at different temperatures and surfactant concentrations are presented. By applying the thermodynamic treatment of Guggenheim, changes in the thermodynamic excess quantities associated with the adsorption were evaluated. The entropy, enthalpy and internal energy of interface formation are positive and become more positive as both the surfactant concentration and the temperature increase. The adsorption of alkylsulfonate ions at the air-solution interface is a favorable process from the entropic viewpoint, while it is an unfavorable one from the energetic viewpoint. The increase of the entropy overcomes the disadvantage of the gain of energy.
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