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Main Title: Disclination lines at homogeneous and heterogeneous colloids immersed in a chiral liquid crystal
Author(s): Melle, Michael
Schlotthauer, Sergej
Hall, Carol K.
Diaz-Herrera, Enrique
Schoen, Martin
Type: Article
Language Code: en
Abstract: In the present work we perform Monte Carlo simulations in the isothermal-isobaric ensemble to study defect topologies formed in a cholesteric liquid crystal due to the presence of a spherical colloidal particle. Topological defects arise because of the competition between anchoring at the colloidal surface and the local director. We consider homogeneous colloids with either local homeotropic or planar anchoring to validate our model by comparison with earlier lattice Boltzmann studies. Furthermore, we perform simulations of a colloid in a twisted nematic cell and discuss the difference between induced and intrinsic chirality on the formation of topological defects. We present a simple geometrical argument capable of describing the complex three-dimensional topology of disclination lines evolving near the surface of the colloid. The presence of a Janus colloid in a cholesteric host fluid reveals a rich variety of defect structures. Using the Frank free energy we analyze these defects quantitatively indicating a preferred orientation of the Janus colloid relative to the cholesteric helix.
Issue Date: 2014
Date Available: 22-Jun-2016
DDC Class: 530 Physik
Sponsor/Funder: DFG, GRK 1524, Self-Assembled Soft-Matter Nanostructures at Interfaces
Journal Title: Soft matter
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 10
Issue: 30
Publisher DOI: 10.1039/c4sm00959b
Page Start: 5489
Page End: 5502
EISSN: 1744-6848
ISSN: 1744-683X
Appears in Collections:Inst. Chemie » Publications

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