Phase separation of penetrable core mixtures

Details Phase separation of penetrable core mixtures Phase separation of penetrable core mixtures

2001-10-18

arxiv.org/abs/cond-mat/0110384v1

Physics

Condensed Matter

Soft Condensed Matter

submitted to J. Stat. Phys. (M.E. Fisher special volume)

Scientific paper

A two-component system of penetrable particles interacting via a gaussian core potential is considered, which may serve as a crude model for binary polymer solutions. The pair structure and thermodynamic properties are calculated within the random phase approximation (RPA) and the hypernetted chain (HNC) integral equation. The analytical RPA predictions are in semi-quantitative agreement with the numerical solutions of the HNC approximation, which itself is very accurate for gaussian core systems. A fluid-fluid phase separation is predicted to occur for a broad range of potential parameters. The pair structure exhibits a nontrivial clustering behaviour of the minority component. Similiar conclusions hold for the related model of parabolic core mixtures, which is frequently used in dissipative particle dynamics (DPD) simulations.

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