Colloid-polymer mixtures in the protein limit

Details Colloid-polymer mixtures in the protein limit Colloid-polymer mixtures in the protein limit

2002-10-23

arxiv.org/abs/cond-mat/0210528v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures, submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.90.068304

We computed the phase-separation behavior and effective interactions of colloid-polymer mixtures in the "protein limit", where the polymer radius of gyration is much larger than the colloid radius. For ideal polymers, the critical colloidal packing fraction tends to zero, whereas for interacting polymers in a good solvent the behavior is governed by a universal binodal, implying a constant critical colloid packing fraction. In both systems the depletion interaction is not well described by effective pair potentials but requires the incorporation of many-body contributions.

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