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Issue 2, 2019
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Inhomogeneous assembly of driven nematic colloids

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Abstract

We present a quantitative analysis of the nonequilibrium assembly of colloidal particles dispersed in a nematic liquid crystal. The driven particles assemble into reconfigurable circular clusters by liquid-crystal-enabled electrokinetic phenomena generated by an AC electric field that provides propulsion along the local director. We identify the coexistence of different aggregation states, including a central, jammed core, where short-range elastic attraction dominates, surrounded by a liquid-like corona where particles retain their mobility but reach a mechanical equilibrium that we rationalize in terms of a balance between centripetal phoretic drive and pairwise repulsion. An analysis of the compressible liquid-like region reveals a linear density profile that can be tuned with the field frequency, and a bond-orientational order that reaches a maximum at intermediate packing densities, where elastic effects are minimized. Since the phoretic propulsion force acts also on assembled particles, we compute the mechanical pressure and show that a hard-disk equation of state can be used to describe the assembly of this driven system.

Graphical abstract: Inhomogeneous assembly of driven nematic colloids

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Article information


Submitted
15 Oct 2018
Accepted
06 Dec 2018
First published
07 Dec 2018

Soft Matter, 2019,15, 312-320
Article type
Paper

Inhomogeneous assembly of driven nematic colloids

J. M. Pagès, A. V. Straube, P. Tierno, J. Ignés-Mullol and F. Sagués, Soft Matter, 2019, 15, 312
DOI: 10.1039/C8SM02101E

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