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An aster-like pattern of assembled pear-shaped particles in a liquid crystal

An aster-like pattern of assembled pear-shaped particles in a liquid crystal

Assemblies of phoretic colloids driven through liquid crystals show the fundamental role of hydrodynamics and display emergent conformal order.

News from Sep 30, 2019

We present a theoretical framework to understand the collective dynamics of an ensemble of electrophoretically driven colloidal particles that are forced to assemble around a single topological defect in a nematic liquid crystal by an alternating current electric field. Our generic model combines phoretic propulsion with electrostatic interactions and liquid-crystal-mediated hydrodynamics, which are effectively cast into a long-range interparticle repulsion. Simulations based on this model fully capture the collective organization process observed in the experiments and the emergence of conformal ordering.

Publication:

Collective dynamics and conformal ordering in electrophoretically driven nematic colloids, A. V. Straube, J. M. Pagès, P. Tierno, J. Ignés-Mullol, and F. Sagués, Phys. Rev. Research 1, 022008(R) (2019)

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