Preparation and electrooptic study of reverse mode polymer dispersed liquid crystal: Performance augmentation with the doping of nanoparticles and dichroic dye

2019 ◽  
Vol 137 (22) ◽  
pp. 48745 ◽  
Author(s):  
Vandna Sharma ◽  
Pankaj Kumar ◽  
Chinky ◽  
Praveen Malik ◽  
K. K. Raina
Keyword(s):  
Liquid Crystal ◽  
Polymer Dispersed Liquid Crystal ◽  
Reverse Mode ◽  
Dichroic Dye ◽  
Polymer Dispersed

scholarly journals Polymer Dispersed Cholesteric Liquid Crystals With a Toroidal Director Configuration under an Electric Field

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 732
Author(s):  
Anna P. Gardymova ◽  
Mikhail N. Krakhalev ◽  
Victor Ya. Zyryanov ◽  
Alexandra A. Gruzdenko ◽  
Andrey A. Alekseev ◽  
...  
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Electric Field ◽  
Point Defects ◽  
Structural Response ◽  
Optical Filters ◽  
Response Curves ◽  
Polymer Dispersed Liquid Crystal ◽  
Dichroic Dye ◽  
Polymer Dispersed

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.

Photochromic Behavior of a Spiro-indolino-oxazine in Reverse-Mode Polymer-Dispersed Liquid Crystal Films

2002 ◽  
Vol 106 (37) ◽  
pp. 9490-9495 ◽  
Author(s):  
A. Romani ◽  
G. Chidichimo ◽  
P. Formoso ◽  
S. Manfredi ◽  
G. Favaro ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Photochromic Behavior ◽  
Liquid Crystal Films ◽  
Polymer Dispersed Liquid Crystal ◽  
Reverse Mode ◽  
Crystal Films ◽  
Polymer Dispersed

A method to produce reverse-mode polymer-dispersed liquid-crystal shutters

1999 ◽  
Vol 74 (26) ◽  
pp. 3945-3947 ◽  
Author(s):  
F. P. Nicoletta ◽  
G. De Filpo ◽  
J. Lanzo ◽  
G. Chidichimo
Keyword(s):  
Liquid Crystal ◽  
Polymer Dispersed Liquid Crystal ◽  
Reverse Mode ◽  
Polymer Dispersed

Orientational control of liquid crystal molecules via carbon nanotubes and dichroic dye in polymer dispersed liquid crystal

2016 ◽  
Vol 44 (5) ◽  
pp. 843-853 ◽  
Author(s):  
Pankaj Kumar ◽  
Vandna Sharma ◽  
Chinky Jaggi ◽  
Praveen Malik ◽  
Kuldeep Kumar Raina
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Polymer Dispersed Liquid Crystal ◽  
Dichroic Dye ◽  
Polymer Dispersed

Preparation and Optical Properties of a Reverse-Mode Polymer Dispersed Liquid Crystal Film

1992 ◽  
Vol 277 ◽  
Author(s):  
Tomohisa Gotoh ◽  
Hideya Murai ◽  
Etsuo Hasegawa ◽  
Katsuhiro Mizoguchi
Keyword(s):  
Liquid Crystal ◽  
Porous Polymer ◽  
Dielectric Anisotropy ◽  
Distinct Advantage ◽  
Dual Frequency ◽  
Uv Curable ◽  
Polymer Dispersed Liquid Crystal ◽  
Reverse Mode ◽  
Polymer Dispersed ◽  
Substitution Type

ABSTRACTTwo new types of reverse-mode polymer-dispersed liquid crystal films have been developed and successfully produced. The first was produced by UV-curing of a mixture of dual frequency addressable liquid crystal (DFALC) and UV-curable polymers under an applied voltage at a frequency lower than the crossover frequency (fc) of the DFALC. This first type is referred to as a dual frequency type. The second type was produced by injecting a liquid crystal having negative dielectric anisotropy into a specially prepared porous polymer film from which liquid crystal having positive dielectric anisotropy had previously been extracted. The type thus produced through such “negative-for-positive” substitution is referred to as a substitution type. While the dual frequency type can not be driven at a low frequency, substitution type can, which gives it a distinct advantage. Other electro-optic characteristics of the two types of films, including alignment properties of the liquid crystal molecules, are also discussed.

Reverse mode operation polymer dispersed liquid crystal with a positive dielectric anisotropy liquid crystal

2010 ◽  
Vol 49 (4) ◽  
pp. 257-262 ◽  
Author(s):  
Daniela Cupelli ◽  
Fiore P. Nicoletta ◽  
Giovanni De Filpo ◽  
Patrizia Formoso ◽  
Giuseppe Chidichimo
Keyword(s):  
Liquid Crystal ◽  
Dielectric Anisotropy ◽  
Polymer Dispersed Liquid Crystal ◽  
Mode Operation ◽  
Reverse Mode ◽  
Polymer Dispersed
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