Stabilization of colloidal suspensions by means of highly-charged nanoparticles

Details Stabilization of colloidal suspensions by means of highly-charged nanoparticles Stabilization of colloidal suspensions by means of highly-charged nanoparticles

2004-11-10

arxiv.org/abs/cond-mat/0411278v2

Phys. Rev. Lett. 93, 247802 (2004)

Physics

Condensed Matter

Soft Condensed Matter

Accepted for publication in Physical Review Letters. See also S. Karanikas and A.A. Louis, cond-mat/0411279. Updated to synchr

Scientific paper

10.1103/PhysRevLett.93.247802

We employ a novel Monte Carlo simulation scheme to elucidate the stabilization of neutral colloidal microspheres by means of highly-charged nanoparticles [V. Tohver et al., Proc. Natl. Acad. Sci. U.S.A. 98, 8950 (2001)]. In accordance with the experimental observations, we find that small nanoparticle concentrations induce an effective repulsion that prevents gelation caused by the intrinsic van der Waals attraction between colloids. Higher nanoparticle concentrations induce an attractive potential which is, however, qualitatively different from the regular depletion attraction. We also show how colloid-nanoparticle size asymmetry and nanoparticle charge can be used to manipulate the effective interactions.

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