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  • Title: Density functional for a model colloid-polymer mixture.
    Author: Schmidt M, Lowen H, Brader JM, Evans R.
    Journal: Phys Rev Lett; 2000 Aug 28; 85(9):1934-7. PubMed ID: 10970651.
    Abstract:
    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 S(ij)(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.
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