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Materials 2015, 8(12), 8072-8086; doi:10.3390/ma8125446

Order Reconstruction in a Nanoconfined Nematic Liquid Crystal between Two Coaxial Cylinders

Department of Physics, Hebei University of Technology, Tianjin 300401, China
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Author to whom correspondence should be addressed.
Academic Editor: Ingo Dierking
Received: 8 October 2015 / Revised: 13 November 2015 / Accepted: 16 November 2015 / Published: 30 November 2015
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

The dynamics of a disclination loop (s = ±1/2) in nematic liquid crystals constrained between two coaxial cylinders were investigated based on two-dimensional Landau–de Gennes tensorial formalism by using a finite-difference iterative method. The effect of thickness (d = R2R1, where R1 and R2 represent the internal and external radii of the cylindrical cavity, respectively) on the director distribution of the defect was simulated using different R1 values. The results show that the order reconstruction occurs at a critical value of dc, which decreases with increasing inner ratio R1. The loop also shrinks, and the defect center deviates from the middle of the system, which is a non-planar structure. The deviation decreases with decreasing d or increasing R1, implying that the system tends to be a planar cell. Two models were then established to analyze the combined effect of non-planar geometry and electric field. The common action of these parameters facilitates order reconstruction, whereas their opposite action complicates the process. View Full-Text
Keywords: liquid crystal; order reconstruction; disclination loop; cylindrical wall; biaxial transition; Landau–de Gennes theory liquid crystal; order reconstruction; disclination loop; cylindrical wall; biaxial transition; Landau–de Gennes theory
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhou, X.; Zhang, Z.; Zhang, Q.; Ye, W. Order Reconstruction in a Nanoconfined Nematic Liquid Crystal between Two Coaxial Cylinders. Materials 2015, 8, 8072-8086.

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