Preparation of a Colloidal Crystal at a Wall Characterized with AFM
Langmuir2001Vol. 17(18), pp. 5486–5490
Citations Over TimeTop 23% of 2001 papers
Els H. A. de Hoog, Liesbeth I. de Jong-van Steensel, Margot M. E. Snel, Jan P. J. M. van der Eerden, H. N. W. Lekkerkerker
Abstract
We present a new procedure to prepare high-quality colloidal crystals at a flat wall, which was oriented vertically in a colloidal suspension. The method is based on the depletion-induced effective attraction between the colloidal particles themselves and between the colloidal particles and a flat wall. The concentrations of the colloidal particles and the depletion agents (polymers in this case) were chosen in such a way that phase transition occurred not only at the wall but also in the bulk. In this way, good conditions were obtained to form high-quality colloidal crystals, consisting of several layers, at a flat wall in a relatively short time period. The crystals formed were characterized with atomic force microscopy.
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