TITLE

Flexoelectric studies on mixtures of compounds made of rodlike and bent-core molecules

AUTHOR(S)
Kundu, Brindaban; Roy, Arun; Pratibha, R.; Madhusudana, N. V.
PUB. DATE
August 2009
SOURCE
Applied Physics Letters;8/24/2009, Vol. 95 Issue 8, p081902
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report measurements of the temperature variations of the flexoelastic ratio (e1-e3)/K of octadecyl cyanobiphenyl and a mixture of this compound with another one with bent-core (BC) molecules, using hybrid aligned nematic cells. Addition of 5 mol % of the BC compound doubles the flexoelastic ratio, implying that the BC compound has ∼20 times larger value compared to that of the compound with calamitic molecules. Mixtures with >11 mol % of the BC compound exhibit only a homeotropic alignment. We develop a simple model to account for this result which arises because of a large positive self-energy due to flexoelectric polarization.
ACCESSION #
43944913

 

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