Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Colloids

CPP 24.3: Vortrag

Mittwoch, 25. März 2009, 14:30–14:45, ZEU 160

Effect of Interface Mediated Interaction between Anisotropic Colloids at Fluid Interface — •Ehsan Noruzifar and Martin Oettel — Institut fuer Physik – Johannes Gutenberg-Universitaet, Staudinger Weg 7, 55099 Mainz, Germany

The effective interaction between colloidal particles trapped at the interface between two fluid phases is influenced by the presence of the deformable interface. Interfacial changes in such a system are responsible for new types of interactions that are not present in the bulk. As an instance, thermal fluctuations of the interface induce a Casimir type interaction between nano scale colloids, which was studied extensively for isotropic particles [1]. In the present work, by adding anisotropy to the colloids, we have investigated the effect of these fluctuation induced forces on possible ordering phenomena. On the other hand, for increasing the size of the trapped anisotropic particles, static deformations of the interface lead to more and more dominating capillary interactions between the colloids [2]. In the second part of the work, using this capillary potential, we have studied the dynamic behavior of colloids at the interface by employing Langevin dynamics simulations.

H. Lehle, M.Oettel, and S. Dietrich, Europhys. Lett. 75, 174 (2006), H. Lehle and M. Oettel, Phys. Rev. E 75, 011602 (2007)
H. Lehle, E. Noruzifar, and M. Oettel, Eur. Phys. J. E 26, 151-160 (2008)