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

作　　者：曾明颖 Holger Merlitz 吴晨旭 

机构地区：[1]Department of Physics and ITPA,Xiamen University [2]College of Information Science and Engineering,Huaqiao University

出　　处：《Chinese Physics B》2015年第2期325-329,共5页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.11374243)

摘　　要：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.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.

关 键 词：quartic coupling surface anchoring energy phase transition wetting behavior 

分 类 号：O753.2[理学—晶体学] TB333[一般工业技术—材料科学与工程]