Berlin 2012 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 10: Interfaces and Thin Films II
CPP 10.8: Vortrag
Dienstag, 27. März 2012, 11:45–12:00, C 130
Phase separation dynamics in a two-dimensional magnetic mixture — •Ken Lichtner1, Andrew J. Archer2, and Sabine H. L. Klapp1 — 1Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany — 2Department of Mathematical Sciences, Loughborough University, Leicestershire, LE11 3TU, UK
Based on classical density functional theory (DFT), we investigate the demixing phase transition of a two-dimensional, binary Heisenberg fluid mixture [1]. The particles in the mixture are modeled as Gaussian soft spheres, where one component is characterized by an additional classical spin-spin interaction of Heisenberg type. Within the DFT we treat the particle interactions using a mean-field approximation. For certain magnetic coupling strengths, we calculate phase diagrams in the density-concentration plane. For sufficiently large coupling strengths and densities, we find a demixing phase transition driven by the ferromagnetic interactions of the magnetic species showing a complex behaviour of the particles similar as in [2]. We also provide a microscopic description (i.e., density profiles) of the resulting non-magnetic/magnetic fluid-fluid interface. Finally, we investigate the phase separation using dynamical density functional theory (DDFT) [3], considering both nucleation processes and spinodal demixing.
[1] K. Lichtner, A. J. Archer, S. H. L. Klapp, J. Chem. Phys., accepted.
[2] R. Rungsawang et al., Phys. Rev. Lett. 104 (2010) 255703.
[3] A. J. Archer and R. Evans, J. Chem. Phys. 121 (2004) 4246.