We have studied experimentally phase separation in binary mixtures comprised of nearly monodisperse emulsion droplets of two different sizes. For three values of {ξ}, where ξ<1 is the size ratio, we have determined phase diagrams and find that segregation occurs for ξ≤0.30±0.02. The phase boundaries are strongly dependent on {ξ}, and phase-separated samples show nearly complete segregation of the two components, as a result of the osmotic depletion effect which drives the phase segregation. Our results agree qualitatively with recent model calculations.
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Steiner et al. (1995) studied this question.
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