Thermodynamics of Micelle Asymmetrization in Aqueous Sodium Decyl Sulfate Solution |
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| Authors: | V S Kuznetsov N V Usol'tseva V V Bykova V P Zherdev G A Anan'eva |
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| Institution: | (1) Ivanovo State University, ul. Ermaka 39, Ivanovo, 153025, Russia;(2) Ivanovo Architecture and Building Engineering Academy, ul. 8 Marta 7, Ivanovo, 153037, Russia |
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| Abstract: | The process of asymmetrization of spherical micelles in an aqueous sodium decyl sulfate solution is studied by scanning calorimetry. This process represents the intermicellar phase transition with an equilibrium temperature of 300 K occurring at a sodium decyl sulfate concentration of 0.12 mol/kg. The partial molar heat capacities of sodium decyl sulfate in a solution are determined and the thermodynamic functions of the rearrangement of micelles and their temperature dependences are calculated. The regions of the thermodynamic stability of solutions that contain spherical and nonspherical micelles, the former being predominant, are revealed. Equilibrium constants of the process and fractions of surfactant aggregated into spherical and nonspherical micelles are calculated for the model of monomolecular reversible reaction. For nonspherical micelles, the shape of the ellipsoid of revolution is proposed. |
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