Dresden 2011 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 45: Topical Session Heterogeneous Nucleation II
MM 45.5: Vortrag
Freitag, 18. März 2011, 11:30–11:45, IFW B
Laser-induced condensation in model colloid-polymer mixtures: ultralow interfacial free energies between coexisting phases — •Tim Neuhaus1, Richard L C Vink2, and Hartmut Löwen1 — 1Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, Germany — 2Institute of Theoretical Physics, Georg-August-Universität Göttingen, Germany
Laser-induced condensation occurs when a system with a bulk liquid-vapor transition is placed into a static external potential which is oscillating in one direction with a wavelength λ. The latter can be realized for colloidal particles by a standing laser field. It was shown previously [1], that for sufficiently large wavelengths λ, the bulk critical point splits into two critical points and a triple point with an intermediate "stacked fluid" phase which is partially condensed in sheets perpendicular to the oscillation direction. These results were obtained by using fundamental measure density functional theory for a colloid-polymer mixture within the Asakura-Oosawa model. Here, we use the same model and technique and calculate the interfacial free energy between all coexisting phases and compare the results with simulation data. We find that the "stacked fluid"-fluid and "stacked fluid"-vapor surface free energies are extremely small.
- [1] I. Götze et al, Mol. Phys. 101, 1651 (2003).