Berlin 2018 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 21: Complex Fluids and Colloids II (joint session CPP/DY)

DY 21.7: Vortrag

Dienstag, 13. März 2018, 11:15–11:30, C 264

Biaxial Phases in binary mixtures of liquid crystals — •Robert Skutnik, Louis Lehmann, Sergej Püschel-Schlotthauer, and Martin Schoen — Stranski-Laboratorium für Physikalische und Theoretische Chemie, Technische Universität Berlin, Sekr. C7, Straße des 17. Juni 135, Berlin 10623, Germany

Liquid crystals are organic molecules of anisotropic shape exhibiting anisotropic interactions. In fact, because of their delocalized π electron system, they exhibit π-π stacking and align parallel with their neighbors. Generally speaking, liquid crystal molecules can be classified as prolate or oblate molecules where the π-π electrons are parallel and perpendicular to the molecular symmetry axis. Hence, the interaction of an oblate and prolate liquid crystal results in a perpendicular alignment with respect to their symmetry axes. We perform Monte Carlo simulations and model both species (i. e., prolate and oblate) by an anisotropic potential based on the well-known 12-6 Lennard-Jones potential which promotes a parallel alignment if both particles are of the same species and perpendicular alignment otherwise. Besides the isotropic phase, we observe the formation of a nematic phase in the presence of a biaxial isotropic phase and the formation of a biaxial nematic phase despite the otherwise uniaxial symmetry of molecules of both species.