PMID: 11308861Apr 20, 2001Paper

Computer simulation of topological defects around a colloidal particle or droplet dispersed in a nematic host

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
D AndrienkoM P Allen

Abstract

We use molecular dynamics to study the ordering of a nematic liquid crystal around a spherical particle or droplet. Homeotropic boundary conditions and strong anchoring create a hedgehog (radial point defect) director configuration on the particle surface and in its vicinity; this topological defect is canceled by nearby defect structures in the surrounding liquid crystal, so as to give a uniform director field at large distances. We observe three defect structures for different particle sizes: a quadrupolar one with a ring defect surrounding the particle in the equatorial plane; a dipolar one with a satellite defect at the north or south pole; and a transitional, nonequatorial, ring defect. These observations are broadly consistent with the predictions of the simplest elastic theory. By studying density and order-parameter maps, we are able to examine behavior near the particle surface, and in the disclination core region, where the elastic theory is inapplicable. Despite the relatively small scale of the inhomogeneities in our systems, the simple theory gives reasonably accurate predictions of the variation of defect position with particle size.

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Citations

Oct 16, 2012·The Journal of Chemical Physics·Manuel GreschekMartin Schoen
May 23, 2012·The Journal of Chemical Physics·Michael MelleMartin Schoen
Dec 3, 2008·The Journal of Chemical Physics·David L Cheung, Michael P Allen
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Feb 7, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Sergej Püschel-SchlotthauerMartin Schoen
May 15, 2002·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Jun-ichi FukudaHiroshi Yokoyama
Mar 17, 2004·The European Physical Journal. E, Soft Matter·Jun-Ichi FukudaHiroshi Yokoyama
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May 15, 2002·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Denis AndrienkoSlobodan Zumer
Mar 20, 2021·Physical Review. E·Mingfeng QiuJean-Christophe Loudet
Dec 15, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·J C LoudetP Poulin

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