Volume 63, Number 2, July 2003
|Page(s)||233 - 239|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 November 2003|
Depletion potentials near geometrically structured substrates
Max-Planck-Institut für Metallforschung -
Heisenbergstr. 3 D-70569 Stuttgart, Germany
2 Institut für Theoretische und Angewandte Physik, Universität Stuttgart Pfaffenwaldring 57, D-70569 Stuttgart, Germany
3 Stranski-Laboratorium für Physikalische und Theoretische Chemie, Sekretariat TC7 Technische Universität Berlin - Strasse des 17. Juni 124, D-10623 Berlin, Germany
Accepted: 16 May 2003
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 which repels a big colloidal particle from the edge.
PACS: 61.20.Gy – Theory and models of liquid structure / 82.70.Dd – Colloids
© EDP Sciences, 2003
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