Abstract
We have studied experimentally phase separation in binary mixtures comprised of nearly monodisperse emulsion droplets of two different sizes. For three values of \ensuremath{\xi}, where $\ensuremath{\xi}l1$ is the size ratio, we have determined phase diagrams and find that segregation occurs for $\ensuremath{\xi}\ensuremath{\le}0.30\ifmmode\pm\else\textpm\fi{}0.02$. The phase boundaries are strongly dependent on \ensuremath{\xi}, 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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