Abstract
The surface tension of mixtures of an ionic fluorocarbon surfactant (NF; C 9F 17OC 6H 4SO 3Na) with nonionic (DMS; C 12H 25SOCH 3) and ionic (STS; C 14H 29SO 4Na) hydrocarbon surfactants was measured in the presence of sodium chloride at different concentrations. The CMC vs monomeric composition curve for the NF—STS system broke where two micellar phases coexisted. The break became sharper as the concentration of sodium chloride increased. The micellar composition was determined from the surface tension data above the CMC. In the surface tension vs micellar composition curve, the NF—STS system showed a plateau region whereas the NF—DMS system did not show such a region. In mixed micelles, NF and DMS were completely miscible and NF and STS had a limited mutual solubility. The critical solution temperature and the composition at the critical solution temperature depended on the concentration of sodium chloride. These facts show that the electrostatic factor is involved in the miscibility of these fluorocarbon and hydrocarbon surfactants in micelles.
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