Quartic coupling and its effect on wetting behaviors in nematic liquid crystals

doi:10.1088/1674-1056/24/2/026101

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.

Keywords: quartic coupling surface anchoring energy phase transition wetting behavior

Received: 02 October 2014
Revised: 22 November 2014
Accepted manuscript online:

PACS:	61.30.Hn	(Surface phenomena: alignment, anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions)
	61.30.Gd	(Orientational order of liquid crystals; electric and magnetic field effects on order)

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

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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