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Title: Inhomogeneous assembly of driven nematic colloids
Author: Pagès Casas, Josep M.
Straube, Arthur V.
Tierno, Pietro
Ignés i Mullol, Jordi
Sagués i Mestre, Francesc
Keywords: Col·loides
Cristalls líquids nemàtics
Nematic liquid crystals
Issue Date: 7-Dec-2018
Publisher: Royal Society of Chemistry
Abstract: We present a quantitative analysis of the nonequilibrium assembly of colloidal particles dispersed ina 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 propulsionalong 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 whereparticles retain their mobility but reach a mechanical equilibrium that we rationalize in terms of abalance between centripetal phoretic drive and pairwise repulsion. An analysis of the compressibleliquid-like region reveals a linear density profile that can be tuned with the field frequency, and abond-orientational order that reaches a maximum at intermediate packing densities, where elasticeffects are minimized. Since the phoretic propulsion force acts also on assembled particles, wecompute the mechanical pressure and show that a hard-disk equation of state can be used to describethe assembly of this driven system.
Note: Versió postprint del document publicat a:
It is part of: Soft Matter, 2018, vol. 15, p. 312-320
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ISSN: 1744-683X
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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