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Updated: Jun 8, 2026

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
Published on: October 31, 2019
Small surface pretilt strikingly affects the director profile during Poiseuille flow of a nematic liquid crystal
C J Holmes1, S L Cornford, J R Sambles
1School of Physics, University of Exeter, Stocker Road, Exeter, EX4 4QL, United Kingdom. c.holmes@ex.ac.uk
Abstract:
Conventional nematic liquid crystal cells are fabricated with small surface pretilt of the director induced by rubbed polymer alignment. Depending on the orientation of the bounding surfaces, this may lead to two slightly different untwisted director configurations, splay and parallel. This small difference leads to remarkably different director profiles during pressure-driven flow, observed here using optical conoscopy. Data show excellent agreement with numerical modeling from Leslie-Ericksen-Parodi theory.
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