Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 54: Posters - Pattern Formation, Reaction Diffusion, Chimera

DY 54.8: Poster

Donnerstag, 23. März 2017, 17:00–19:30, P1A

Lamellae and dipolar ordering in fluid mixtures of hard nematic rods and dipolar spheres — •Alice C. von der Heydt and Sabine H. L. Klapp — Inst. of Theoret. Physics, TU Berlin, Secr. EW 7-1, Hardenbergstr. 36, 10623 Berlin, Germany

Suspensions of dipolar, e.g., magnetic particles in a liquid crystal (LC) [1] continue to stimulate scientific activity due to interesting properties such as dipolar chain formation and spontaneous magnetisation induced by the LC [2]. Microdomains coupled to LC order already appear in mixtures of differently shaped particles with hard-body repulsion only [3]. Our study focuses on the even richer phase behaviour in mixtures of hard, parallelly aligned LC rods and dipolar spheres able to display smectic density and dipolar orientation patterns. To systematically extract the prerequisites for ordering, we identify and analyse a free-energy functional of suitable collective order parameters. The long-range, anisotropic dipolar interaction is considered with continuous spatial, angular, and strength variables. A stability analysis sheds light on the coupling of smectic, component-density, and dipolar ordering in the control-parameter space of packing fraction, sphere density, and dipolar strength. For rods and spheres of similar size, lamellar phase separation is seen to be the dominant effect. 0.4em [1] F. Brochard, P.-G. de Gennes, J. Phys. - Paris 31, 691 (1970)
S. D. Peroukidis, K. Lichtner, S. H. L. Klapp, Soft Matter 11, 5999 (2015)
Z. Dogic, D. Frenkel, S. Fraden, Phys. Rev. E 62, 3925 (2000)