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Liquid Crystals Volume 34, 2007 - Issue 2
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Original Articles

Determination of the difference of flexoelectric coefficients in a nematic liquid crystal using a conoscopic technique

E. K. Tidey Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ, United Kingdom
,
L. A. Parry‐Jones Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ, United Kingdom
&
S. J. Elston Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ, United Kingdom
Pages 251-255 | Received 17 Jul 2006, Accepted 23 Oct 2006, Published online: 28 Feb 2007
 
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Abstract

The conoscopic images of twisted nematic liquid crystal devices filled with E7 are analysed under the application of in‐plane electric fields. The differences observed between the images for positive and negative applied fields are attributed to the flexoelectric effect. By comparison of the conoscopic images with theoretical predictions made using an extended Jones technique, the sign and magnitude of the difference between the splay and bend flexoelectric coefficients is determined for E7.

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Related Research Data

Conoscopic Observations of a Homeotropically Aligned Antiferroelectric Liquid Crystal Device: A Comparison of Theory and Experiment
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The effect of the molecular structure on flexoelectric coupling in the chiral nematic phase
Source: Royal Society of Chemistry (RSC)
Measurement of the difference in flexoelectric coefficients of nematic liquid crystals using a twisted nematic geometry.
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