Density functional for a model colloid-polymer mixture

Matthias Schmidt, Hartmut Löwen, Joseph M. Brader, Robert Evans

Research output: Contribution to journalArticle (Academic Journal)peer-review

158 Citations (Scopus)


We present a density functional theory for mixtures of (hard sphere) colloidal particles and ideal polymers. For this extreme nonadditive system we employ a fundamental measures approach to construct a functional which incorporates the correct dimensional crossover and the exact low density limit. In bulk fluid mixtures the functional yields the same free energy and, therefore, the same gas-liquid (demixing) transition as given by free-volume theory. It generates consistent pair correlation functions; the partial structure factors Sij(k) diverge, as k→0, at the critical point obtained from the free energy. Our results for the structure agree well with those from simulation and Percus-Yevick theory.
Original languageEnglish
Pages (from-to)1934-1937
Number of pages4
JournalPhysical Review Letters
Issue number9
Publication statusPublished - 28 Aug 2000


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