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Cover Picture: Non‐Uniform Helix Unwinding of Cholesteric Liquid Crystals in Cells with Interdigitated Electrodes (ChemPhysChem 7/2014)
Author(s) -
Rumi Mariacristina,
Tondiglia Vincent P.,
Natarajan Lalgudi V.,
White Timothy J.,
Bunning Timothy J.
Publication year - 2014
Publication title -
chemphyschem
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201490030
Subject(s) - electrode , cholesteric liquid crystal , reflection (computer programming) , materials science , electric field , liquid crystal , voltage , optoelectronics , helix (gastropod) , optics , cover (algebra) , total internal reflection , turn (biochemistry) , elongation , chemistry , composite material , electrical engineering , physics , ultimate tensile strength , biochemistry , mechanical engineering , ecology , quantum mechanics , snail , computer science , biology , programming language , engineering
The cover image shows optical polarizing micrographs of a cholesteric liquid crystal in a cell with interdigitated electrodes for various applied voltages (increasing from top to bottom). On p. 1311 T. J. Bunning et al. report that in cells with narrow gaps between the electrodes, the pitch elongation is not uniform through the thickness of the cell, as a result of electric field gradients. This leads to different voltage‐induced color changes in the selective reflection band depending on the side of illumination of the cell, as illustrated by the reflection mode micrographs on the left and right side of the cover image.