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Miscibility of sodium dodecyl sulfate and sodium decyl sulfate in the adsorbed film and micelle

Takiue, T. ; Tomioka, M. ; Ikeda, N. ; Matsubara, A. ; Aratono, M. ; Motomura, K. ;
  • 초록  

    Abstract The interfacial tension of the aqueous solution of sodium dodecyl sulfate (SDS) and sodium decyl sulfate (SDeS) mixture against hexane was measured as a function of the total molality and composition of the surfactant mixture at 298.15 K under atmospheric pressure. The compositions of adsorbed film and micelle were evaluated numerically by applying the thermodynamic relations to the experimental results. These results were shown in the form of the phase diagrams of adsorption and micelle formation and compared with those of the aqueous solution of sodium perfluorooctanoate (SPFO) and SDeS mixture. It was found that the diagrams of SDS and SDeS system have swollen cigar shapes and are quite different from those of SPFO and SDeS system which show non-ideal mixing both in the adsorbed film and micelle. This finding was attributed to the fact that the interaction between fluorocarbon and hydrocarbon chains is weaker than that between hydrocarbon chains.


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  • 주제어

    Miscibility .   adsorbed film .   micelle .   phase diagram .   ideal mixing.  

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