Abstract
A primitive model for surface and interfacial tension in surfactant systems is developed on the basis of the statistical associating fluid theory (SAFT). The mean spherical approximation (MSA) is applied to describe the ion−ion interaction in this model. The surface and interfacial tensions for five surfactant systems are measured in the range 21−50 °C. The experimental data obtained at 25 °C and the surface tensions of CxEy−water systems from literature are correlated. The surface and interfacial tensions of these systems up to 50 °C are predicted by the parameters obtained from correlation. Both the correlated and predicted results are satisfactory.
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