Abstract
The surface equation of state valid for a single, pure surfactant at the water/air interface has been extended to cover systems containing two different surfactants. Nonideality of each single surfactant at the water surface is fully accounted for, but specific interaction between the surfactants is neglected. This enables the surface tension, as a function of the concentrations for mixed surfactant solutions, to be predicted if the behavior of the separate constituents is known. Systems containing dodecyl ammonium chloride and either decylammonium chloride or octanoic acid show fair to excellent agreement with this theory, indicating that in these systems specific surface interactions have a negligible effect on the surface tension. Systems containing lauric acid and sodium laurate show wide deviations from the theory. These deviations may be used to assess specific interaction.
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