Colloidal particles at a nematic-isotropic interface: effects of confinement

Details Colloidal particles at a nematic-isotropic interface: effects of confinement Colloidal particles at a nematic-isotropic interface: effects of confinement

2006-06-07

arxiv.org/abs/cond-mat/0606169v1

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 9 figures

Scientific paper

10.1140/epje/i2006-10017-1

When captured by a flat nematic-isotropic interface, colloidal particles can be dragged by it. As a result spatially periodic structures may appear, with the period depending on a particle mass, size, and interface velocity~\cite{west.jl:2002}. If liquid crystal is sandwiched between two substrates, the interface takes a wedge-like shape, accommodating the interface-substrate contact angle and minimizing the director distortions on its nematic side. Correspondingly, particles move along complex trajectories: they are first captured by the interface and then `glide' towards its vertex point. Our experiments quantify this scenario, and numerical minimization of the Landau-de Gennes free energy allow for a qualitative description of the interfacial structure and the drag force.

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