Fluid-fluid demixing transitions in colloid--polyelectrolyte star mixtures

Details Fluid-fluid demixing transitions in colloid--polyelectrolyte star mixtures Fluid-fluid demixing transitions in colloid--polyelectrolyte star mixtures

2006-11-27

arxiv.org/abs/cond-mat/0611678v1

J. Phys.: Condens. Matter 19, 076105 (2007)

Physics

Condensed Matter

Soft Condensed Matter

24 pages, 9 figures, submitted to Journal of Physics: Condensed Matter

Scientific paper

10.1088/0953-8984/19/7/076105

We derive effective interaction potentials between hard, spherical colloidal particles and star-branched polyelectrolytes of various functionalities and smaller size than the colloids. The effective interactions are based on a Derjaguin-like approximation, which is based on previously derived potentials acting between polyelectrolyte stars and planar walls. On the basis of these interactions we subsequently calculate the demixing binodals of the binary colloid--polyelectrolyte star mixture, employing standard tools from liquid-state theory. We find that the mixture is indeed unstable at moderately high overall concentrations. The system becomes more unstable with respect to demixing as the star functionality and the size ratio grow.

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