Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 36: Complex Fluids and Colloids V (joint session BP/CPP/DY, organized by DY)

CPP 36.1: Vortrag

Mittwoch, 9. März 2016, 10:00–10:15, H47

Self-assembly in binary mixtures of liquid-crystalline rods and dipolar spheres: A free-energy study — •Alice C. von der Heydt, Stavros D. Peroukidis, and Sabine H. L. Klapp — Inst. f. Theoretische Physik, Techn. Univ. Berlin, Hardenbergstr. 36, 10623 Berlin

Mixtures of differently shaped particles with hard-core repulsion only can exhibit a variety of spatially periodic phase-separation patterns combined with liquid-crystalline order [1]. Simulations have revealed an even more complex behavior with uni- or biaxial, smectic and lamellar structures in binary mixtures of rods and soft magnetic spheres of comparable diameter [2]. In this study, we aim at a theoretical description that will allow us to trace phase boundaries and to explain topologies of some of these structures for a model mixture of hard rods with nematic order and dipolar hard spheres. The semi-analytical route we propose starts from a free-energy functional which governs the single-particle component-density distribution functions of position and orientation. This functional is constructed using concepts of classical density functional theory and the modified mean-field approximation for the dipolar interaction [3].

@percent[1] Z. Dogic, D. Frenkel, S. Fraden, Phys. Rev. E 62, 3925 (2000)

@percent[2] S. D. Peroukidis, K. Lichtner, S. H. L. Klapp, Soft Matter 11, 5999 (2015)

@percent[3] G. M. Range, S. H. L. Klapp, Phys. Rev. E 69, 041201 (2004)