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  A novel model for smectic liquid crystals: Elastic anisotropy and response to a steady-state flow.

Püschel-Schlotthauer, S., Meiwes Turrión, V., Stieger, T., Grotjahn, R., Hall, C. K., Mazza, M. G., et al. (2016). A novel model for smectic liquid crystals: Elastic anisotropy and response to a steady-state flow. The Journal of Chemical Physics, 145(16): 164903. doi:10.1063/1.4965711.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-A97D-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-4058-1
Genre: Journal Article

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http://aip.scitation.org/doi/10.1063/1.4965711 (Publisher version)
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 Creators:
Püschel-Schlotthauer, Sergej, Author
Meiwes Turrión, Victor1, Author              
Stieger, Tillmann, Author
Grotjahn, Robin, Author
Hall, Carol K., Author
Mazza, Marco G.1, 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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Free keywords: Poiseuille flow; Elasticity; Phase transitions; Liquid crystal flows; Anisotropy
 Abstract: By means of a combination of equilibrium Monte Carlo and molecular dynamics simulations and nonequilibrium molecular dynamics we investigate the ordered, uniaxial phases (i.e., nematic and smectic A) of a model liquid crystal. We characterize equilibrium behavior through their diffusive behavior and elastic properties. As one approaches the equilibrium isotropic-nematic phase transition, diffusion becomes anisotropic in that self-diffusion D⊥ in the direction orthogonal to a molecule’s long axis is more hindered than self-diffusion D∥ in the direction parallel to that axis. Close to nematic-smectic A phase transition the opposite is true, D∥ < D⊥. The Frank elastic constants K1, K2, and K3 for the respective splay, twist, and bend deformations of the director field n are no longer equal and exhibit a temperature dependence observed experimentally for cyanobiphenyls. Under nonequilibrium conditions, a pressure gradient applied to the smectic A phase generates Poiseuille-like or plug flow depending on whether the convective velocity is parallel or orthogonal to the plane of smectic layers. We find that in Poiseuille-like flow the viscosity of the smectic A phase is higher than in plug flow. This can be rationalized via the velocity-field component in the direction of the flow. In a sufficiently strong flow these smectic layers are not destroyed but significantly bent. Published by AIP Publishing.

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Language(s): eng - English
 Dates: 2016-10-252016-10-28
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1063/1.4965711
 Degree: -

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Title: The Journal of Chemical Physics
Source Genre: Journal
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Pages: 14 Volume / Issue: 145 (16) Sequence Number: 164903 Start / End Page: - Identifier: ISSN: 0021-9606