Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: Colloids and Complex Liquids II
CPP 34.6: Vortrag
Donnerstag, 29. März 2012, 16:30–16:45, C 130
Two-dimensional percolated networks induced by an uniform external field. — •Heiko Schmidle1, Carol K. Hall2, Orlin D. Velev2, and Sabine H. L. Klapp1 — 1Technische Universität Berlin — 2North Carolina State University
In this work we present results of a theoretical investigation of induced dipoles mixed with particles that contain two induced dipoles, one pointing into the field and the other one opposite to it. Our model is based on current experimental works where such particles are synthesized and interesting self-assembly is observed [1]. Induced dipoles tend to form chains into the external field direction [2]. Particles that contain two dipole moments are similar to quadrupolar particles and are able to build structures perpendicular to the external field. The mixture allows the assembly into two-dimensional networks induced by an one-dimensional field and this effect is of great interest in synthesizing new responsive materials. The formation of dipoles without field was also studied recently [3]. We use Monte-Carlo simulations to study the assembly of such particles and the physical properties of the resulting networks. Further we focus on the influence of macroscopic parameters like concentration and density on these properties.
[1] S. Gangwal, A. Pawar, I. Kretzschmar, and O. D. Velev, Soft Matter 6, 1413 (2010).
[2] H. Schmidle and S. H. L. Klapp, J. Chem. Phys. 134, 114903 (2011).
[3] H. Schmidle, C. K. Hall, O. D. Velev, and S. H. L. Klapp, Soft Matter (2011), accepted.