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Title: Alternating twist structures formed by electroconvection in the nematic phase of an achiral bent-core molecule
Authors: Tanaka, Shingo
Dhara, Surajit
Sadashiva, B.K.
Shimbo, Yoshio
Takanishi, Yoichi
Araoka, Fumito
Ishikawa, Ken
Takezoe, Hideo
Issue Date: Apr-2008
Publisher: American Physical Society
Citation: Physical Review E, 2008, Vol.77, 041708
Abstract: We report an unusual electroconvection in the nematic phase of a bent-core liquid crystal. In a voltage-frequency diagram, two frequency regions exhibiting prewavy stripe patterns were found, as reported by Wiant et al. We found that these stripes never show extinction dark when cells were rotated under crossed polarizers. Based on the color interchange in between neighboring stripes by the rotation of the cells or an analyzer, twisted molecular orientation is suggested; i.e., the directors are alternately twisted from the top to the bottom surfaces with a pretilt angle in adjacent stripes, which is an analogue of the twisted (splayed) structure observed in surface-stabilized ferroelectric liquid crystal cells. The transmittance spectra calculated using the 4×4 matrix method from the model structure are consistent with the experimental observation.
Description: Open Access.
ISSN: E-ISSN: 1550-2376
P-ISSN: 1539-3755
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Copyright: 2008 American Physical Society
Appears in Collections:Research Papers (SCM)

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