Abstract
Surfactants have been considered by a number of investigators to form premicellar multimers such as dimers and acid-soap. In this paper a method based upon a thermodynamic model for the dependence of surface tension on surfactant concentration to identify premicellar aggregation is presented. Surface tension data for potassium oleate solutions is analyzed using the above model and the deviations in surface tension behavior from that expected of monomeric oleate is attributed to dimerization. The formation constants for doubly charged oleate dimer is estimated from this analysis to be 6 × 10 3 (kmol/m 3) −1.
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