The effect of backflow on the field-induced director alignment process: Nuclear Magnetic Resonance study and theoretical analysis

The nature of the orientational relaxation process of the director, ̂n, to its equilibrium orientation, ̂neq(r), in a liquid crystal cell has been investigated both experimentally and theoretically. The experiments employ deuterium NMR spectroscopy to investigate the time-resolved field-induced dire...

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Bibliographic Details
Published in:Physics procedia 2011, Vol.14, p.102-114
Main Authors: Sugimura, Akihiko, Vakulenko, A.A., Zakharov, A.V.
Format: Article
Language:English
Subjects:
Anisotropic systems
Liquid Crystals
Nuclear Magnetic Resonance Spectroscopy
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Summary:The nature of the orientational relaxation process of the director, ̂n, to its equilibrium orientation, ̂neq(r), in a liquid crystal cell has been investigated both experimentally and theoretically. The experiments employ deuterium NMR spectroscopy to investigate the time-resolved field-induced director orientation, and the theory is based on a numerical study of the system of hydrodynamic equations; these include both director motion and fluid flow and take account of backflow. The relaxation time and the influence of the effect of backflow on the orientational relaxation process for a thin nematic film of 4 − n − pentyl − 4_ − cyanobiphenyl has been investigated for a number of dynamic regimes. Reasonable agreement is observed between the calculated values and experimental results.
ISSN:1875-3892
1875-3892
DOI:10.1016/j.phpro.2011.05.021