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- Title
同轴结构球形液滴的尺寸效应和电场动力学.
- Authors
马 鹤; 陈思博; 吴金兵; 周 璇; 张志东
- Abstract
Based on Landau-de Gennes theory,the size effect of spherical droplets with nematic concentric structure and the dynamic process under electric field are investigated.Results show that the concentric structure is stable in the range of radius r≥6.5μm.When r≤5.1μm,there is only bipolar structure.When 5.2μm≤r<6.5μm,it is degenerate state between bipolar structure and concentric structure.When an electric field is present,at 0≤E/E0≤0.002 4(reducing the electric field with E0,E0=33.7 V/μm),the liquid crystal molecules are gradually arranged in the direction of the electric field.When 0.002 7≤E/E0≤0.003,the elastic energy,surface energy and electric field energy compete with each other to induce the first structural transition,which causes a similar bipolar structure in the droplet.When 0.003 3≤E/E0<0.013 4,the directors are arranged in the direction perpendicular to the electric field near the equatorial plane,the upper and lower parts of the sphere are symmetrical and the directors are along the direction of the electric field.When the electric field strength reaches the threshold Ec/E0=0.013 4,the second structural transition is found,which occurs for the first time in the concentric structure.Most of the liquid crystal molecules in the droplets realize the rotation from the central axis to the boundary point by point in the direction of the electric field through the dynamic process.
- Publication
Chinese Journal of Liquid Crystal & Displays, 2020, Vol 35, Issue 4, p293
- ISSN
1007-2780
- Publication type
Academic Journal
- DOI
10.3788/YJYXS20203504.0293