Colloids, polymers, and needles: Demixing phase behavior

Details Colloids, polymers, and needles: Demixing phase behavior Colloids, polymers, and needles: Demixing phase behavior

2001-10-04

arxiv.org/abs/cond-mat/0110100v1

Phys. Rev. E 65, 021508 (2002)

Physics

Condensed Matter

Soft Condensed Matter

9 pages, 15 figures

Scientific paper

10.1103/PhysRevE.65.021508

We consider a ternary mixture of hard colloidal spheres, ideal polymer spheres, and rigid vanishingly thin needles, which model stretched polymers or colloidal rods. For this model we develop a geometry-based density functional theory, apply it to bulk fluid phases, and predict demixing phase behavior. In the case of no polymer-needle interactions, two-phase coexistence between colloid-rich and -poor phases is found. For hard needle-polymer interactions we predict rich phase diagrams, exhibiting three-phase coexistence, and reentrant demixing behavior.

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