Effect of polymer-polymer interactions on the surface tension of colloid-polymer mixtures

Details Effect of polymer-polymer interactions on the surface tension of colloid-polymer mixtures Effect of polymer-polymer interactions on the surface tension of colloid-polymer mixtures

2003-09-10

arxiv.org/abs/cond-mat/0309248v1

Physics

Condensed Matter

Soft Condensed Matter

12 pages, 5 figures, accepted for J. Chem. Phys

Scientific paper

10.1063/1.1621613

The density profile and surface tension for the interface of phase-separated colloid-polymer mixtures have been studied in the framework of the square gradient approximation for both ideal and interacting polymers in good solvent. The calculations show that in the presence of polymer-polymer excluded volume interactions the interfaces have lower widths and surface tensions compared to the case of ideal polymers. These results are a direct consequence of the shorter range and smaller depth of the depletion potential between colloidal particles induced by interacting polymers.

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