Structure of Colloid-Polymer Suspensions

Details Structure of Colloid-Polymer Suspensions Structure of Colloid-Polymer Suspensions

2002-04-17

arxiv.org/abs/cond-mat/0204381v1

J. Phys.: Condens. Matter 12, R239-R269 (2002)

Physics

Condensed Matter

Soft Condensed Matter

37 pages, 17 figures; topical feature article

Scientific paper

10.1088/0953-8984/14/12/201

We discuss structural correlations in mixtures of free polymer and colloidal particles based on a microscopic, 2-component liquid state integral equation theory. Whereas in the case of polymers much smaller than the spherical particles the relevant polymer degree of freedom is the center of mass, for polymers larger than the (nano-) particles conformational rearrangements need to be considered. They have the important consequence that the polymer depletion layer exhibits two widely different length scales, one of the order of the particle radius, the other of the order of the polymer radius or the polymer density screening length in dilute or semidilute concentrations, respectively. Their consequences on phase stability and structural correlations are discussed extensively.

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