Journal
APPLIED PHYSICS LETTERS
Volume 82, Issue 1, Pages 13-15Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1534942
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A technique has been developed for the measurement of the K-22 twist elastic constant in nematic liquid crystal materials. This involves the measurement of the Freedericksz transition voltages in untwisted linear and pi-twist regions in a wedge cell geometry. The method avoids the need for the accurate determination of the cell thickness and cholesteric pitch and is far more straightforward to implement than other methods in the literature. The validity of this method is demonstrated for the well-characterized material E7. (C) 2003 American Institute of Physics.
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