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Near-critical fluid interfaces: A comparison of theory and experiment

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  • Schmidt, James W.

Abstract

Measurements of the ellipticity and the reflectivity of liquid-liquid interfaces in mixtures near their consolute points are compared with theories of the interface. Both sets of measurements yield the same interfacial thickness within experimental error when scaled appropriately by theories that combine both the intrinsic density-profile and capillary-wave aspects of the interface. The theories correctly predict the temperature dependence of the thickness, but systematically overestimate the thickness itself. When the few comparable data for pure fluids are scaled by the same theories, they show an unexpected temperature dependence of the thickness, which is not consistent with the mixture results.

Suggested Citation

  • Schmidt, James W., 1991. "Near-critical fluid interfaces: A comparison of theory and experiment," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 172(1), pages 40-52.
    • Handle: RePEc:eee:phsmap:v:172:y:1991:i:1:p:40-52
    DOI: 10.1016/0378-4371(91)90310-9
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    References listed on IDEAS

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    1. Zielinska, B.J.A. & Bedeaux, D. & Vlieger, J., 1981. "Electric and magnetic susceptibilities for a fluid-fluid interface; The ellipsometric coefficient," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 107(1), pages 91-108.
    2. Blokhuis, E.M. & Bedeaux, D., 1990. "Optical properties of the fluid-fluid interface," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 164(3), pages 515-548.
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