Small angle X-ray scattering of microemulsions
We have measured the small angle X-ray scattering of several water-n-octanepolyglycolether microemulsions covering a wide range of amphiphile concentrations, while keeping near to the top of the three-phase triangle in its symmetrical position. The resulting scattering curves are in excellent agreement with the formula derived by Teubner and Strey  in the context of a Landau-type expansion with negative gradient term. The correlation lengths involved increase by a factor of 25 when going from the highest to the lowest amphiphile concentrations used. The outer part of the curves are consistent with Porod’s law, implying a black and white structure. At even larger angles, deviations from Porod’s law occur, which can be attributed to a monolayer interface.
Key wordsSmall angle X-ray scattering microemulsions Porod’s law Teubner-Strey formula
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