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DY: Fachverband Dynamik und Statistische Physik

DY 53: Complex Fluids and Soft Matter (joint session DY/ CPP / BP)

DY 53.4: Vortrag

Mittwoch, 14. März 2018, 16:15–16:30, BH-N 334

Dynamics and rheology of ferronematics — •Gaurav P. Shrivastav and Sabine H.L. Klapp — Institut für Theoretische Physik, Sekr. EW 7-1, Technische Universität Berlin, Hardenbergstr. 36, D-10623 Berlin.

Suspensions of magnetic nanoparticle (MNP) and liquid crystals (LC) show a rich variety of self-assembled structures and have a wide range of applications [1].

Using molecular dynamics (MD) simulations, we study the dynamical and rheological properties of these mixtures. We consider an 80:20 binary mixture of LCs and MNPs and perform MD simulations in NVT ensemble. We find that LC and MNP both show normal translational and rotational diffusive behavior in the isotropic and also in the nematic phase. However, in the nematic phase both species display an increased translational diffusion in the direction parallel to the nematic director.

To characterize the rheological properties of the mixture, we deform the bulk LC-MNP mixture by shearing it with constant shear rates. The stress-strain rate flow curve shows a shear thinning behavior in these mixtures. We also observe that the nematic order of LC and MNP both increases with strain but the degree of ordering in MNPs is higher than in LCs if the quiescent mixture is in the isotropic phase.

References:

[1] S. D. Peroukidis, and S. H. L. Klapp, Phys. Rev. E 92, 010501(R) (2015).

[2] G. P. Shrivastav, and S. H. L. Klapp, in preparation (2018).