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Title: Collective dynamics and conformal ordering in electrophoretically driven nematic colloids
Author: Straube, Arthur V.
Pagès Casas, Josep M.
Tierno, Pietro
Ignés i Mullol, Jordi
Sagués i Mestre, Francesc
Keywords: Col·loides
Issue Date: 30-Sep-2019
Publisher: American Physical Society
Abstract: We present a theoretical framework to understand the collective dynamics of an ensemble of electrophoret-ically driven colloidal particles that are forced to assemble around a single topological defect in a nematicliquid crystal by an alternating current electric field. Our generic model combines phoretic propulsion withelectrostatic interactions and liquid-crystal-mediated hydrodynamics, which are effectively cast into a long-rangeinterparticle repulsion, while nematic elasticity plays a subdominant role. Simulations based on this modelfully capture the collective organization process observed in the experiments and other striking effects as theemergence of conformal ordering and a nearly frequency-independent repulsive interaction above 10 Hz. Ourresults demonstrate the importance of hydrodynamic interactions on the assembly of driven microscale matter inanisotropic media.
Note: Reproducció del document publicat a:
It is part of: Physical Review Research, 2019, vol. 1, num. 2, p. 022008
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ISSN: 2643-1564
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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