Abstract
Properties and microstructures of mixed reverse micelles of anionic surfactant AOT and non-ionic surfactants in n-heptane were investigated using conductivity and dynamic light scattering. As in the reverse micelle formed with AOT alone, a conductivity maximum was also observed in conductivity- W 0 (molar ratio of water to surfactants) curves for mixed reverse micelles, and W 0,max (the W 0 where the conductivity reaches its maximum) moved to a smaller W 0 value with increasing non-ionic surfactant content and EO chain length. When NaCl solutions were solubilized by the mixed reverse micelles, the W 0,max moved to a larger W 0 value with increased concentration of NaCl solutions. These phenomena were interpreted in terms of the proposed physical meaning of W 0,max and the results of dynamic light scattering. The relationship between the conductivity of reverse micelles and their microstructures was discussed.
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