Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/127819
Title: Inhomogeneous assembly of driven nematic colloids
Author: Pagès, Josep M.
Straube, Arthur V.
Tierno, Pietro
Ignés i Mullol, Jordi
Sagués i Mestre, Francesc
Keywords: Col·loides
Cristalls líquids
Colloids
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 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
URI: http://hdl.handle.net/2445/127819
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 SizeFormat 
684263.pdf2.03 MBAdobe PDFView/Open    Request a copy


Embargat   Document embargat fins el 7-12-2019


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.