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  Flow-induced deformation of closed disclination lines near a spherical colloid immersed in a nematic host phase.

Stieger, T., Püschel-Schlotthauer, S., Schoen, M., & Mazza, M. G. (2016). Flow-induced deformation of closed disclination lines near a spherical colloid immersed in a nematic host phase. Molecular Physics, 114(2), 259-275. doi:10.1080/00268976.2015.1096973.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-5EA4-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-40F6-E
Genre: Journal Article

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 Creators:
Stieger, Tillmann, Author
Püschel-Schlotthauer, Sergej, Author
Schoen, Martin, Author
Mazza, Marco G.1, 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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Free keywords: Colloidal particle; Nematic liquid crystal; Defect topology; Poiseuille flow; Microfluidics; Nonequilibrium molecular dynamics simulation
 Abstract: We present nonequilibrium molecular dynamics simulations of a spherical colloidal particle with a chemically homogeneous surface immersed in a nematic liquid-crystal host phase. This setup is then placed between planar and atomically structured substrate surfaces that serve to fix the nematic far-field director . The substrates are separated by a sufficiently large distance such that they do not interfere directly with the environment of the colloid. Because of a mismatch between and the local homeotropic anchoring of molecules of the liquid crystal (i.e., mesogens) at the surface of the colloid circular defect (Saturn) rings ℓ arise if the host is in thermodynamic equilibrium (i.e., in the absence of flow). The size of these rings depends on the range of the mesogen–colloid interactions which we model via an attractive Yukawa potential. As Poiseuille flow is initiated, ℓ is deformed. The degree of deformation is analysed quantitatively in terms of characteristic geometric parameters fitted to suitable projections of ℓ. Our results suggest that smaller ℓ are shifted downstream while approximately maintaining their circular shape, whereas larger ones exhibit an elastic deformation in addition. We provide a simple geometric argument to predict the downstream shift of smaller, circular ℓs in excellent agreement with the simulation data over the range of steady-state flows considered.

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Language(s): eng - English
 Dates: 2015-10-212016-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1080/00268976.2015.1096973
BibTex Citekey: stieger-molphys-2015
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Title: Molecular Physics
Source Genre: Journal
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Pages: - Volume / Issue: 114 (2) Sequence Number: - Start / End Page: 259 - 275 Identifier: ISSN: 0026-8976