Regensburg 2019 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 54: Poster: Complex, Fluids, Glasses, Granular

DY 54.3: Poster

Donnerstag, 4. April 2019, 15:00–18:00, Poster B2

Rheology of a model composite of liquid crystals and magnetic nanoparticles — •Nima H. Siboni, Gaurav P. Shrivastav, and Sabine H. L . Klapp — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36 D-10623 Berlin

Liquid crystals (LC) functionalized with nano-to-micro sized magnetic particles (MNP) have attracted much recent attention due to their rich self-assembly, dynamics and a wide range of applications [1]. Using molecular dynamics (MD) simulations, we show that the flow properties of the LC matrix can be modified by the inclusion of spherical MNPs.

We study the rheology of an 80:20 binary mixture of LCs and MNPs in the isotropic phase for various dipolar coupling strengths of the MNP by shearing it via Lees-Edwards periodic boundary conditions with constant shear rates. The mixture shows a shear thinning behavior for the considered range of the dipolar coupling strength. The extent of the non-Newtonian region in the flow curve increases with increasing dipolar coupling strength of the MNPs. The nematic order in LC and MNP both increases with strain, however, the degree of ordering in MNPs is higher than in LCs.

References:

[1] G. P. Shrivastav, and S. H. L. Klapp, arXiv:1809.08288 (2018).

[2] G. P. Shrivastav, N. H. Siboni and S. H. L. Klapp, in preparation.