Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 45: Colloids and Complex Liquids II
CPP 45.11: Vortrag
Donnerstag, 14. März 2013, 18:00–18:15, H40
Phase transitions and phase equilibria in spherical confinement — •Antonia Statt, Alexander Winkler, Peter Virnau, and Kurt Binder — Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudinger Weg 7, D-55099 Mainz, Germany
The interplay of finite size and surface effects for fluids confined in a sphere is studied via Monte Carlo simulations of the Asakura-Oosawa model for colloid-polymer mixtures1 using free energy calculations. For this model the phase separation in a colloid-rich phase and a polymer-rich phase is well known in the bulk2,3 and we show that spherical confinement enhances the miscibility of the mixture. Depending on the wall potentials of the confining surface, the wetting properties can be controlled, and this interplay between adsorption of one species to the confining surface and bulk unmixing leads to very special shapes of the loops observed for the chemical potential of the colloids.
[1] S. Asakura and F. Oosawa, J. Polym. Sci. 33, 183
[2] R.L.C. Vink and J. Horbach, J. Chem. Phys. 121, 3253
[3] R.L.C. Vink, J. Horbach, and K. Binder, Phys. Rev. E 71,011401