Interaction of supramolecular aggregates and the enhanced optical torque on the director in a dye doped nematic liquid crystal

Soft Matter ◽  
2019 ◽  
Vol 15 (43) ◽  
pp. 8886-8895
Author(s):  
V. M. Pergamenshchik ◽  
V. V. Multian ◽  
V. Ya. Gayvoronsky ◽  
V. A. Uzunova ◽  
S. V. Kredentser ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Experimental Evidence ◽  
Nematic Liquid Crystal ◽  
Dye Molecules ◽  
Strong Enhancement ◽  
Director Reorientation ◽  
Supramolecular Aggregates ◽  
Optical Torque

Based on the experimental evidence of aggregation of dye molecules, the effect of strong enhancement of the light-induced director reorientation in a dye-doped nematic liquid crystal is explained by the interaction of supramolecular aggregates.

Observation of Nematic Liquid Crystal Director Reorientation at the Interface between Substrate and Liquid Crystal Layer by Total Reflection Ellipsometry

2001 ◽  
Vol 40 (Part 1, No. 1) ◽  
pp. 244-249 ◽  
Author(s):  
Satoshi Okutani ◽  
Munehiro Kimura ◽  
Hirokazu Toriumi ◽  
Kenichi Akao ◽  
Toshiyasu Tadokoro ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Total Reflection ◽  
Crystal Layer ◽  
Liquid Crystal Layer ◽  
Director Reorientation

Large Optical Torque Enhancement By Oligothiophene Dye In A Nematic Liquid Crystal Host

2004 ◽  
Vol 421 (1) ◽  
pp. 107-115 ◽  
Author(s):  
T. Kosa ◽  
P. Palffy-Muhoray ◽  
H. Zhang ◽  
T. Ikeda
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Optical Torque

scholarly journals Dielectric and Electro-Optic Effects in a Nematic Liquid Crystal Doped with h-BN Flakes

Crystals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 123 ◽  
Author(s):  
Rajratan Basu ◽  
Lukas J. Atwood ◽  
George W. Sterling
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Nematic Liquid Crystal ◽  
Hexagonal Boron Nitride ◽  
Honeycomb Structure ◽  
Dielectric Anisotropy ◽  
Isotropic Phase ◽  
Electro Optic ◽  
Anchoring Strength ◽  
Director Reorientation

A small quantity of hexagonal boron nitride (h-BN) flakes is doped into a nematic liquid crystal (LC). The epitaxial interaction between the LC molecules and the h-BN flakes rising from the π−π electron stacking between the LC’s benzene rings and the h-BN’s honeycomb structure stabilizes pseudo-nematic domains surrounding the h-BN flakes. Electric field-dependent dielectric studies reveal that the LC-jacketed h-BN flakes follow the nematic director reorientation upon increasing the applied electric field. These anisotropic pseudo-nematic domains exist in the isotropic phase of the LC+h-BN system as well, and interact with the external electric field, giving rise to a nonzero dielectric anisotropy in the isotropic phase. Further investigations reveal that the presence of the h-BN flakes at a low concentration in the nematic LC enhances the elastic constants, reduces the rotation viscosity, and lowers the pre-tilt angle of the LC. However, the Fréedericksz threshold voltage stays mostly unaffected in the presence of the h-BN flakes. Additional studies show that the presence of the h-BN flakes enhances the effective polar anchoring strength in the cell. The enhanced polar anchoring strength and the reduced rotational viscosity result in faster electro-optic switching in the h-BN-doped LC cell.

Orientational optical torque in a nematic liquid crystal, caused by trans- and cis-isomers of low- and high-molecular compounds

2016 ◽  
Vol 43 (5) ◽  
pp. 179-183 ◽  
Author(s):  
I. A. Budagovsky ◽  
A. S. Zolot’ko ◽  
M. P. Smayev ◽  
S. A. Shvetsov ◽  
N. I. Boiko
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Molecular Compounds ◽  
Optical Torque
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