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Quartic coupling and its effect on wetting behaviors in nematic liquid crystals |
Zeng Ming-Ying (曾明颖)a b, Holger Merlitza, Wu Chen-Xu (吴晨旭)a |
a Department of Physics and ITPA, Xiamen University, Xiamen 361005, China; b College of Information Science and Engineering, Huaqiao University, Xiamen 361021, China |
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Abstract Based on the fact that rubbed groove patterns also affect the anchoring of liquid crystals at substrates, a quartic coupling is included in constructing the surface energy for a liquid crystal cell. The phase diagram and the wetting behaviors of the liquid crystal cell, bounded by surfactant-laden interfaces in a magnetic field perpendicular to the substrate are discussed by taking the quartic coupling into account. The nematic order increases at the surface while it decreases in the bulk as a result of the introduction of quartic substrate-liquid crystal coupling, indicating that the groove anchoring makes the liquid crystal molecules align more orderly near the substrate than away from it. This causes a different wetting behavior: complete wetting.
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Received: 02 October 2014
Revised: 22 November 2014
Accepted manuscript online:
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PACS:
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61.30.Hn
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(Surface phenomena: alignment, anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions)
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61.30.Gd
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(Orientational order of liquid crystals; electric and magnetic field effects on order)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11374243). |
Corresponding Authors:
Wu Chen-Xu
E-mail: cxwu@xmu.edu.cn
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Cite this article:
Zeng Ming-Ying (曾明颖), Holger Merlitz, Wu Chen-Xu (吴晨旭) Quartic coupling and its effect on wetting behaviors in nematic liquid crystals 2015 Chin. Phys. B 24 026101
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