TY - JOUR

T1 - Density functional for a model colloid-polymer mixture

AU - Schmidt, Matthias

AU - Löwen, Hartmut

AU - Brader, Joseph M.

AU - Evans, Robert

PY - 2000/8/28

Y1 - 2000/8/28

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=6744245585&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.85.1934

DO - 10.1103/PhysRevLett.85.1934

M3 - Article (Academic Journal)

SN - 0031-9007

VL - 85

SP - 1934

EP - 1937

JO - Physical Review Letters

JF - Physical Review Letters

IS - 9

ER -