Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2021

Идентификатор DOI: 10.3390/polym13050732

Ключевые слова: cholesteric droplet, dichroic dye, electric field, orientational structure, polymer dispersted liquid crystal

Аннотация: 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. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Журнал: Polymers

Выпуск журнала: Vol. 13, Is. 5

Номера страниц: 1-11

ISSN журнала: 20734360

Издатель: MDPI AG

• Gardymova Anna P. (Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia)
• Krakhalev Mikhail N. (Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia; RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia)
• Zyryanov Victor Ya. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia)
• Gruzdenko Alexandra A. (Lomonosov Moscow State Univ, Fac Phys, Moscow 119991, Russia)
• Alekseev Andrey A. (Lomonosov Moscow State Univ, Fac Phys, Moscow 119991, Russia)
• Rudyak Vladimir Yu. (Lomonosov Moscow State Univ, Fac Phys, Moscow 119991, Russia)

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