Studies on Micelle Formation in Non-polar Solvent by Thermistor

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Abstract
The apparent mean aggregation number (Z) of dodecylammonium carboxylate in cyclohexane was obtained from the vapor pressure depression measurement by the use of a pair of thermistors. The monomer concentration (C1) was calculated from Kreuzer’s equations. The C1 was nearly independent of the concentration. The true aggregation number (λ) was obtained, assuming that the micelle is monodisperse. The cmc extraploated from C1 agreed approximately with those by other methods. The change of the heat content associated with micelle formation was calculated from the change of the cmc with the temperature and from the temperature dependence of the equilibrium constant for the λ-mer aggregation. Both agreed roughly with each other.