Entropically Driven Surface Phase Separation in Binary Colloidal Mixtures

P. D. Kaplan, J. L. Rouke, A. G. Yodh, D. J. Pine

Research output: Contribution to journalArticlepeer-review


We investigate the phase diagram of mixtures of charge stabilized polystyrene spheres of two different sizes in the hard-sphere limit. We observe bulk phase separation into two disordered phases and find a new ordered phase located on the cell walls. The ordered phase occurs at volume fractions as low as 0.2, much less than the value of 0.49 for hard-sphere freezing in monodisperse suspensions, and is qualitatively explained with simple geometric arguments.

Original languageEnglish (US)
Pages (from-to)582-585
Number of pages4
JournalPhysical Review Letters
Issue number4
StatePublished - 1994

ASJC Scopus subject areas

  • General Physics and Astronomy


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