Volume 77, Number 6, March 2007
|Number of page(s)||6|
|Published online||28 February 2007|
Colloid-polymer mixtures between asymmetric walls: Evidence for an interface localization transition
Institut für Physik, Johannes-Gutenberg-Universität Mainz - Staudinger Weg 7, 55099 Mainz, Germany
2 Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf - Universitätsstr. 1, 40225 Düsseldorf, Germany
Accepted: 26 January 2007
We demonstrate via computer simulation that mixtures of colloids and polymers confined to thin films have the ability to undergo an interface localization transition. While one wall of the film is assumed to be hard for both particles, at the other wall, an additional repulsive potential acts, but on the colloids only. By varying the strength of this repulsion, a crossover from capillary condensation to interface localization is found. The latter occurs under conditions where in the bulk almost complete phase separation has occurred.
PACS: 05.70.Jk – Critical point phenomena / 64.60.Fr – Equilibrium properties near critical points, critical exponents / 68.08.Bc – Wetting
© Europhysics Letters Association, 2007
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