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  Defect topologies in a nematic liquid crystal near a patchy colloid

Melle, M., Schlotthauer, S., Mazza, M. G., Klapp, S. H. L., & Schoen, M. (2012). Defect topologies in a nematic liquid crystal near a patchy colloid. The Journal of Chemical Physics, 136(19): 194703. doi:10.1063/1.4717619.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-B41D-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-22A9-2
Genre: Journal Article

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 Creators:
Melle, Michael, Author
Schlotthauer, Sergej, Author
Mazza, Marco G.1, Author              
Klapp, Sabine H. L., Author
Schoen, Martin, Author
Affiliations:
1Group Non-equilibrium soft matter, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063308              

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 Abstract: Using isothermal-isobaric Monte Carlo simulations we investigate defecttopologies due to a spherical colloidal particle immersed in a nematic liquid crystal.Defects arise because of the competition between the preferential orientation at the colloid's surface and the far-field director nˆ0. Considering a chemically homogeneous colloid as a special case we observe the well-known surface and saturn ring defecttopologies for weak and strong perpendicular anchoring, respectively; for homogeneous, strong parallel anchoring we find a boojum defecttopology that has been seen experimentally [see P. Poulin and D. A. Weitz, Phys. Rev. E57, 626 (1998)] but not in computer simulations. We also consider a heterogeneous, patchy colloid where the liquid-crystal molecules anchor either preferentially planar or perpendicular at the surface of the colloid. For a patchy colloid we observe a boojum ring defecttopology in agreement with recent experimental studies [see M. Conradi, M. Ravnik, M. Bele, M. Zorko, S. Žumer, and I. Muševič, Soft Matter5, 3905 (2009)]. We also observe two other novel defecttopologies that have not been reported thus far neither experimentally nor theoretically.

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Language(s): eng - English
 Dates: 20122012
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1063/1.4717619
BibTex Citekey: melle_defect_2012
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Title: The Journal of Chemical Physics
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Institute of Physics
Pages: 13 Volume / Issue: 136 (19) Sequence Number: 194703 Start / End Page: - Identifier: ISSN: 0021-9606
CoNE: /journals/resource/954922836226