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Keywords = polymer dispersted liquid crystal

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11 pages, 18576 KB  
Article
Polymer Dispersed Cholesteric Liquid Crystals with a Toroidal Director Configuration under an Electric Field
by Anna P. Gardymova, Mikhail N. Krakhalev, Victor Ya. Zyryanov, Alexandra A. Gruzdenko, Andrey A. Alekseev and Vladimir Yu. Rudyak
Polymers 2021, 13(5), 732; https://doi.org/10.3390/polym13050732 - 27 Feb 2021
Cited by 23 | Viewed by 4608
Abstract
The electro-optical properties of polymer dispersed liquid crystal (PDLC) films are highly dependent on the features of the contained liquid crystal (LC) droplets. Cholesteric LC droplets with homeotropic boundaries can form several topologically different orientational structures, including ones with single and more point [...] Read more.
The electro-optical properties of polymer dispersed liquid crystal (PDLC) films are highly dependent on the features of the contained liquid crystal (LC) droplets. Cholesteric LC droplets with homeotropic boundaries can form several topologically different orientational structures, including ones with single and more point defects, layer-like, and axisymmetric twisted toroidal structures. These structures are very sensitive to an applied electric field. In this work, we have demonstrated experimentally and by computer simulations that twisted toroidal droplets reveal strong structural response to the electric field. In turn, this leads to vivid changes in the optical texture in crossed polarizers. The response of droplets of different sizes were found to be equivalent in terms of dimensionless parameters. In addition, the explanation of this phenomenon showed a comparison of theoretical and experimental structural response curves aids to determine the shape of the droplet. Finally, we demonstrated that the addition of a dichroic dye allows such films to be used as optical filters with adjustable color even without polarizers. Full article
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