Abstract
ABSTRACT Liquid crystal dimer CB7CB (1″,7″-bis(4-cyanobiphenyl-4′-yl)heptane) is confined between two concentric cylinders with the liquid crystal director initially aligned axially along the concentric cylinder. When a non-uniform radial electric field perpendicular to the concentric cylinder axis is applied, the director is gradually changed as the applied voltage increases. We obtain a threshold voltage analytical formula for the angular deformation of the director between two concentric cylinders. In addition, the effect of different flexoelectric coefficients on the deformation of the director between two concentric cylinders under the radial electric field was also investigated. The results show that the flexoelectric coefficients will determine how the director will be deformed. It provides a more accurate theoretical analysis for predicting the coupling effects of dielectric effect and giant flexoelectric effect on the director orientation distribution between two concentric cylinders under a non-uniform radial electric field.
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