Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/141945
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 Colloids 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: https://doi.org/10.1039/C8SM02101E |
It is part of: | Soft Matter, 2018, vol. 15, p. 312-320 |
URI: | http://hdl.handle.net/2445/141945 |
Related resource: | https://doi.org/10.1039/C8SM02101E |
ISSN: | 1744-683X |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
686128.pdf | 2.03 MB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.