Structure and thermodynamics of colloid-polymer mixtures: a macromolecular approach

Details Structure and thermodynamics of colloid-polymer mixtures: a macromolecular approach Structure and thermodynamics of colloid-polymer mixtures: a macromolecular approach

2000-07-17

arxiv.org/abs/cond-mat/0007273v1

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 4 figures; to be published in Europhys. Lett

Scientific paper

10.1209/epl/i2000-00383-8

The change of the structure of concentrated colloidal suspensions upon addition of non-adsorbing polymer is studied within a two-component, Ornstein-Zernicke based liquid state approach. The polymers' conformational degrees of freedom are considered and excluded volume is enforced at the segment level. The polymer correlation hole, depletion layer, and excess chemical potentials are described in agreement with polymer physics theory in contrast to models treating the macromolecules as effective spheres. Known depletion attraction effects are recovered for low particle density, while at higher densities novel many-body effects emerge which become dominant for large polymers.

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