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悬浮在向列相液晶中球形微粒周围的土星环和偶极子缺陷的稳定性(英文)    

Stability of Saturn-Ring and Dipole Defects Around Microspheres Suspended in Nematic Liquid Crystals

文献类型:期刊文献

中文题名:悬浮在向列相液晶中球形微粒周围的土星环和偶极子缺陷的稳定性(英文)

英文题名:Stability of Saturn-Ring and Dipole Defects Around Microspheres Suspended in Nematic Liquid Crystals

作者:王玉生[1];吕健[1];宋纳红[2]

第一作者:王玉生

机构:[1]华北水利水电学院数学与信息科学学院,河南郑州450011;[2]河南财经学院计算机科学与信息工程学院,河南郑州450002

第一机构:华北水利水电学院数学与信息科学学院,河南郑州450011

年份:2010

期号:5

起止页码:635-639

中文期刊名:液晶与显示

外文期刊名:Chinese Journal of Liquid Crystals and Displays

收录:CSTPCD;;Scopus;北大核心:【北大核心2008】;CSCD:【CSCD_E2011_2012】;

基金:华北水利水电学院青年科研基金(No.HSQJ2009018)

语种:中文

中文关键词:指向矢场;土星环缺陷;自由能

外文关键词:director field; Saturn-ring defect; free energy;

摘要:在向列相液晶中悬浮的球形微粒周围可能存在两种类型的缺陷:土星环结构和偶极子结构。文章通过计算它们的自由能,研究了向列相液晶中两种类型缺陷的稳定性。计算结果表明:当k24k1-12lnRr1()c时,对于半径较小的球形微粒土星环缺陷比较稳定,但是对于较大的球形微粒偶极子缺陷比较稳定。进而可得,通过增加粒子半径、鞍形展曲弹性常数k24或者减小弹性常数k的方法可以实现土星环缺陷向偶极子缺陷的转变。
The stability of Saturn-ring and dipole defects in nematic liquid crystals is studied.Two structures are possible around microspheres suspended in nematic liquid crystals:a Saturn-ring and a dipole,which are investigated by calculating their Frank free energy.As a result,if k24〈 k 1-12lnRr1( ) c ,the Saturn-ring is the preferred configuration which does not depend on the particle size,where R1is the length of liquid crystal molecule,kand k24are the elastic constants,and rcis the radius of the disclination line core.If k24〉k 1-21lnRr1( ) c ,for small particles the Saturn-ring defect is more stable,and contrarily for large particles the dipole defect is more stable.The results demonstrate that a transition from the Saturn-ring defect to the dipole defect is induced either by increasing the particle size,the saddle-splay elastic constant k24or by decreasing k.

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