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Microemulsion microstructure and interfacial curvature

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Abstract

The typical phase behavior of microemulsion systems undergoing phase inversion is briefly reviewed. As a model system H2O-n-octane-C12E5 is studied with various experimental techniques. The occurring microstructures are visualized by freeze fracture electron microscopy and the corresponding domain sizes are quantified by small-angle neutron scattering. From the variations of the domain sizes the mean and Gaussian curvatures of the interfacial film with temperature are determined. It is found that the mean interfacial curvatureH changes gradually and nearly linearly with temperature from positive (Winsor I) to negative (Winsor II), passing through zero for bicontinuous microemulsions where these contain exactly equal volume fractions of water and oil. There the interfacial tension between bulk water-and oil-rich phases passes through an extreme minimum. Quantitative knowledge of the curvatures permits the measurements of interfacial tensions between the bulk phases to be discussed in terms of the relative contributions of bending energy and entropy of dispersion.

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  1. Max-Planck-Institut für Biophysikalische Chemie, Postfach 2841, 37018, Göttingen, Germany

    R. Strey

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Strey, R. Microemulsion microstructure and interfacial curvature. Colloid Polym Sci 272, 1005–1019 (1994). https://doi.org/10.1007/BF00658900

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  • DOI: https://doi.org/10.1007/BF00658900

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