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Updated: Feb 15, 2026

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
Published on: October 31, 2019
Visual evaluation of surface anchoring strength by electrohydrodynamic convection of a nematic liquid crystal
Gyu Jin Choi1, Jae Min Song1, Chul Gyu Jhun2
1Department of Physics, Yeungnam University, 280 Daehak-Ro, Gyeongsan 38541, Republic of Korea.
Abstract:
Visual evaluation of the surface anchoring energies in a nematic liquid crystal (LC) cell is characterized by the direction of the convection roll pattern that appears in the low-frequency conduction regime. The convection roll pattern in a twisted nematic LC (TNLC) cell is oriented perpendicular to the midplane LC director dominating the direction of convection flow, and its direction is determined by the relative surface anchoring energy between two surface boundaries. Thus the direction of the roll pattern generated at the TNLC cell with asymmetric LC alignment layers can provide information on the surface anchoring energies at the two boundaries. We demonstrate a method for determining the two anchoring energies through a measured midplane LC director applied to the Ericksen-Leslie equation.
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