Abstract
Measurements have been made of the interfacial tensions of aqueous solutions of sodium dodecyl sulfate against solutions of octyl alcohol in benzene. By the application of the Gibbs adsorption theorem approximate calculations have been made of the surface excess of alcohol molecules and detergent molecules in the mixed adsorbed interfacial film on the assumption that this film contains no water molecules. The suggestion is made that, for systems in true equilibrium, the effect of oil-soluble impurities in the sodium dodecyl sulfate should be less than in corresponding experiments at air-water surfaces. The properties of the mixed adsorbed films are intermediate between those of the two pure components.
Published Version
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