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DY: Fachverband Dynamik und Statistische Physik

DY 55: Poster: Turbulence; Complex Fluids; Microfluidics; Droplets and Wetting

DY 55.12: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P1A

Rheology and self-assembly of mixtures of magnetic and nonmagnetic liquid crystals under shear and external field — •Ferdinand Schönerstedt, Nima H. Siboni, and Sabine H. L. Klapp — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin

Doping liquid crystals (LC) with magnetic nanoparticles (MNP) has proven a successful strategy to obtain magnetic field responsive materials. In this work, motivated by recent advances in MNP manufacturing technology [1], we investigate the effect of the external field on rheology and self-assembly of LC-MNP mixtures where the MNPs have the same shape and the same size of the LC particles.

It is noteworthy that even in the absence of the magnetic dipole-dipole interactions, such mixtures show an interesting demixing at strong fields, and as a consequence, an intriguing non-monotonic field dependence of the shear stress emerges [2]. By considering a finite dipole-dipole interaction in a non-equilibrium molecular dynamics simulation setup, we explore the interplay between the self-assembly of MNPs (under the influence of the external field [3]), and the shear- and magnetic field-induced orderings.

[1] A. Mertelj, D. Lisjak, M. Drofenik, and M. Čopič, Nature 504, 237 (2013).

[2] N. H. Siboni, G. P. Shrivastav, and S. H. L. Klapp, arXiv:1908.10815 (2019).

[3] C. E. Alvarez, and S. H. L. Klapp, Soft Matter 8, 7480 (2012).