Analytical phase diagram for colloid-polymer mixtures

G.J. Fleer, R. Tuinier

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    55 Citations (Scopus)

    Abstract

    We present a theoretical analysis of the phase behavior of colloid-polymer mixtures which applies to all polymer/colloid size ratios q. It accounts for the crossover from a constant length scale R (radius of gyration) in the colloid limit (small q) to the concentration-dependent correlation length xi in the protein limit (q>1). We obtain predictions that fully agree with observations and simulations. In the protein limit the colloid concentrations eta along the binodals become independent of q and the polymer concentrations phi scale as q(1/gamma), where gamma=0.77 is the scaling exponent in xi similar to phi(-gamma): phase diagrams plotted as phi q(-1/gamma) vs eta are then independent of q. The liquid window in the protein limit is narrow.
    Original languageEnglish
    Pages (from-to)041802/1-04180/4
    JournalPhysical Review. E, Statistical nonlinear, and soft matter physics
    Volume76
    DOIs
    Publication statusPublished - 2007

    Keywords

    • critical end-point
    • depletion interactions
    • density-fluctuations
    • protein limit
    • hard-spheres
    • behavior
    • model
    • suspensions
    • separation
    • thickness

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