Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: POSTERS Polymerphysics
CPP 34.9: Poster
Donnerstag, 28. Februar 2008, 17:00–19:30, Poster A
Dipolar ordering between three and two dimensions — •R. Andreea Trasca1 and Sabine H.L. Klapp1,2 — 1Stranski-Laboratorium für Physicalische und Theoretische Chemie, Sekretariat C7,Technische Universität Berlin,Strasse des 17. Juni 115, D-10623 Berlin, Germany — 2Institut für Theoretische Physik, Sekretariat PN 7-1, Facultät II für Mathematik und Naturwissenschaften, Technische Uniersität Berlin, Hardenbergstraße 36, D-10623 Berlin, Germany
We perform Monte Carlo simulations to investigate the orientational and translational ordering behavior of dipolar soft-sphere films confined between planar walls with gaps between 5 and 1.5 σ [1]. At 5 σ the dipolar film exhibits a spontaneous ferromagnetic transition similar to ones previously found at larger gaps and in bulk [2]. As the gap is decreased the ferromagnetic order vanishes, but a high degree of dipolar allignment is preserved, as antiferromagnetic stripes.
Besides the orientational ordering, the dipolar film forms layers due to soft-sphere interactions. The translational order in the plane of the layers is investigated using pair correlation functions and bond angle order parameters. As a reference we also compute the translational order of confined soft-sphere films. At very high densities, starting from the equilibrated soft-sphere configuration and random dipoles,a nontrivial change of the translational as well as the orientational structure of the dipolar soft-sphere film is observed.
1. R.A. Andreea and S.H.L. Klapp, in preparation.
2. S.H.L.Klapp and M.Schoen, J.Chem.Phys. 117, 8050 (2002).