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|Title:||Inhomogeneous assembly of driven nematic colloids|
|Author:||Pagès, Josep M.|
Straube, Arthur V.
Ignés i Mullol, Jordi
Sagués i Mestre, Francesc
|Publisher:||Royal Society of Chemistry|
|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.|
|Note:||Versió postprint del document publicat a: https://doi.org/10.1039/C8SM02101E|
|It is part of:||Soft Matter, 2018, vol. 15, p. 312-320|
|Appears in Collections:||Articles publicats en revistes (Ciència dels Materials i Química Física)|
Document embargat fins el 7-12-2019
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