Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 3: Liquid Crystals and Polar Fluids
CPP 3.8: Vortrag
Montag, 25. Februar 2008, 12:00–12:15, C 264
Field–controlled layer formation in dipolar nanofilms — •Jelena Jordanovic1 and Sabine H. L. Klapp1,2 — 1Stranski-Laboratorium, Technische Universität Berlin, Strasse des 17.Juni 135, 10623 Berlin — 2Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin
Using molecular dynamic we investigate the equilibrium behaviour of a dipolar model fluid confined between two plane parallel walls, focussing on the influence of an additional homogeneous external electric or magnetic field. Structural properties are examined for field directions parallel and perpendicular with respect to the walls. Confinement alone induces already an in–plane orientation of the dipole moments [1] such that a parallel field easily polarizes the system. Moreover, the parallel field enhances the layer structure typical for confined fluids. Contrary to that a perpendicular field gives a new preferential direction which competes with the in–plane orientation observed without field. As a consequence very large fields are required to reach similar polarisation values as with parallel field. A particularly interesting effect is that high fields can generate a new layer in the system accompanied by structural rearrangements within the layer [2].
[1] V. A. Froltsov and S. H. L. Klapp, J. Chem. Phys. 124, 134701 (2006); ibid. 126, 114703 (2007).
[2] J. Jordanovic and S. H. L. Klapp, in preparation.