Depletion potentials near geometrically structured substrates

Details Depletion potentials near geometrically structured substrates Depletion potentials near geometrically structured substrates

2003-03-07

arxiv.org/abs/cond-mat/0303131v1

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 7 figures

Scientific paper

10.1209/epl/i2003-00517-6

Using the recently developed so-called White Bear version of Rosenfeld's Fundamental Measure Theory we calculate the depletion potentials between a hard-sphere colloidal particle in a solvent of small hard spheres and simple models of geometrically structured substrates: a right-angled wedge or edge. In the wedge geometry, there is a strong attraction beyond the corresponding one near a planar wall that significantly influences the structure of colloidal suspensions in wedges. In accordance with an experimental study, for the edge geometry we find a free energy barrier of the order of several $k_B T$ which repels a big colloidal particle from the edge.

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