Evidence for the flexo-electric effect in a nematic liquid crystal cell
- 1 September 1986
- journal article
- research article
- Published by Taylor & Francis in Liquid Crystals
- Vol. 1 (5), 483-490
- https://doi.org/10.1080/02678298608086271
Abstract
We present evidence for the flexo-electric effect in a hybrid aligned nematic cell containing 4-methoxybenzylidene-4'-n-butylaniline (MBBA) subject to d.c. excitation, by comparing the theoretical curve derived by including the flexo-electric term in the free energy with the experimental points. The agreement appears to be very good for MBBA doped with a small amount of an additive which shows reversible electrochemical reactions at very low redox potential; this allows us to determine the sum of the flexo-electric coefficients and the anchoring energy on the planar wall. For undoped MBBA the experimental results can be justified only by assuming a low voltage screening of the electric field, due to the presence of ionic impurities in the material.Keywords
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