Effects of auxiliary ligands of Pd(ii) dimers on induction of chiral nematic phases: chirality inversion and the photo-responsive structural change

2015 ◽  
Vol 44 (7) ◽  
pp. 3209-3215 ◽  
Author(s):  
Kenji Tamura ◽  
Jun Yoshida ◽  
Masahiro Taniguchi ◽  
Takafumi Kitazawa ◽  
Akihiko Yamagishi ◽  
...  
Keyword(s):  
Structural Change ◽  
Liquid Crystals ◽  
Cd Spectrum ◽  
Chiral Nematic ◽  
Axially Chiral ◽  
Nematic Phases

An axially chiral Pd(ii) dimer changed its CD spectrum reversibly under irradiation at either 350 nm or 460 nm when it was doped in liquid crystals.

scholarly journals Reversible Broad-Spectrum Control of Selective Reflections of Chiral Nematic Phases by Closed-/Open-Type Axially Chiral Azo Dopants

ChemistryOpen ◽  
2017 ◽  
Vol 6 (6) ◽  
pp. 684-684 ◽  
Author(s):  
Hiroya Nishikawa ◽  
Daigou Mochizuki ◽  
Hiroki Higuchi ◽  
Yasushi Okumura ◽  
Hirotsugu Kikuchi
Keyword(s):  
Broad Spectrum ◽  
Open Type ◽  
Chiral Nematic ◽  
Axially Chiral ◽  
Spectrum Control ◽  
Nematic Phases

scholarly journals Front Cover: Reversible Broad-Spectrum Control of Selective Reflections of Chiral Nematic Phases by Closed-/Open-Type Axially Chiral Azo Dopants (ChemistryOpen 6/2017)

ChemistryOpen ◽  
2017 ◽  
Vol 6 (6) ◽  
pp. 683-683
Author(s):  
Hiroya Nishikawa ◽  
Daigou Mochizuki ◽  
Hiroki Higuchi ◽  
Yasushi Okumura ◽  
Hirotsugu Kikuchi
Keyword(s):  
Broad Spectrum ◽  
Front Cover ◽  
Open Type ◽  
Chiral Nematic ◽  
Axially Chiral ◽  
Spectrum Control ◽  
Nematic Phases

scholarly journals Reversible Broad-Spectrum Control of Selective Reflections of Chiral Nematic Phases by Closed-/Open-Type Axially Chiral Azo Dopants

ChemistryOpen ◽  
2017 ◽  
Vol 6 (6) ◽  
pp. 710-720 ◽  
Author(s):  
Hiroya Nishikawa ◽  
Daigou Mochizuki ◽  
Hiroki Higuchi ◽  
Yasushi Okumura ◽  
Hirotsugu Kikuchi
Keyword(s):  
Broad Spectrum ◽  
Open Type ◽  
Chiral Nematic ◽  
Axially Chiral ◽  
Spectrum Control ◽  
Nematic Phases

scholarly journals Dielectric Spectroscopy Analysis of Liquid Crystals Recovered from End-of-Life Liquid Crystal Displays

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2873
Author(s):  
Ana Barrera ◽  
Corinne Binet ◽  
Frédéric Dubois ◽  
Pierre-Alexandre Hébert ◽  
Philippe Supiot ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
End Of Life ◽  
Room Temperature ◽  
Liquid Crystal Displays ◽  
Dielectric Anisotropy ◽  
Frequency Range ◽  
Spectroscopy Analysis ◽  
Diamond Nanoparticles ◽  
Nematic Phases ◽  
Universal Law

In the present work, the dielectric properties of recycled liquid crystals (LCs) (non-purified, purified, and doped with diamond nanoparticles at 0.05, 0.1, and 0.2 wt%) were investigated. The studied LC mixtures were obtained from industrial recycling of end-of-life LC displays presenting mainly nematic phases. Dielectric measurements were carried out at room temperature on a frequency range from 0.1 to 106 Hz using an impedance analyzer. The amplitude of the oscillating voltage was fixed at 1 V using cells with homogeneous and homeotropic alignments. Results show that the dielectric anisotropy of all purified samples presents positive values and decreases after the addition of diamond nanoparticles to the LC mixtures. DC conductivity values were obtained by applying the universal law of dielectric response proposed by Jonscher. In addition, conductivity of the doped LC mixtures is lower than that of the undoped and non-purified LC.

Circularly polarized luminescence in chiral nematic liquid crystals: generation and amplification

2021 ◽  
Author(s):  
Xuefeng Yang ◽  
Xue Jin ◽  
Tonghan Zhao ◽  
Pengfei Duan
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Excellent Performance ◽  
Circularly Polarized ◽  
Chiral Nematic ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence

Chiral nematic liquid crystals exhibit excellent performance in obtaining high luminescence dissymmetry factor of circularly polarized luminescence.

scholarly journals Nanocomposites of Polyaniline and Cellulose Nanocrystals Prepared in Lyotropic Chiral Nematic Liquid Crystals

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Dawei Zhang ◽  
Lihong Zhang ◽  
Bingzhe Wang ◽  
Guangzhe Piao
Keyword(s):  
Liquid Crystals ◽  
Cellulose Nanocrystals ◽  
Nematic Liquid Crystals ◽  
Weight Ratio ◽  
Asymmetric Reaction ◽  
Reaction Field ◽  
Electron Microscopies ◽  
Chiral Nematic ◽  
Before And After

Stable lyotropic chiral nematic liquid crystals (N*-LCs) of cellulose nanocrystals (CNs) were prepared via hydrolysis using sulfuric acid. The lyotropic N*-LCs were used as an asymmetric reaction field to synthesize polyaniline (PANI) onto CNs by in situ polymerization. As a primary step, we examined the mesophase transition of the N*-LCs of CNs suspension before and after in situ polymerization of aniline (ANI) by polarizing optical microscopy. The structure of nanocomposites of PANI/CNs was investigated at a microscopic level using Fourier transform infrared spectroscopy and X-ray diffraction. Influence of the CNs-to-ANI ratio on the morphology of the nanocomposites was also investigated at macroscopic level by scanning electron and transmission electron microscopies. It is found that the weight ratio of CNs to aniline in the suspension significantly influenced the size of the PANI particles and interaction between CNs and PANI. Moreover, electrical properties of the obtained PANI/CNs films were studied using standard four-probe technique. It is expected that the lyotropic N*-LCs of CNs might be available for an asymmetric reaction field to produce novel composites of conjugated materials.

Nematicons routing through two types of disclination lines in chiral nematic liquid crystals

2014 ◽  
Vol 23 (04) ◽  
pp. 1450042 ◽  
Author(s):  
Michał Kwaśny ◽  
Urszula A. Laudyn ◽  
Katarzyna A. Rutkowska ◽  
Mirosław A. Karpierz
Keyword(s):  
Liquid Crystals ◽  
Wave Vector ◽  
Nematic Liquid Crystals ◽  
Input Beam ◽  
Oriented Sample ◽  
Beam Position ◽  
Chiral Nematic ◽  
Different Types ◽  
Optimal Beam ◽  
Beam Parameters

In this work, we study nematicons propagation at the disclination lines in a wedge-shaped planarly oriented sample. Using optimal beam parameters for light self-trapping and varying the input beam position and direction of the wave vector k with respect to the z-axis, we gain insight in the nematicons propagation in the highly disturbed area around two different types of disclination lines in chiral nematic.

Effect of Photo-Isomerization of Azo Dyes on the Photonic Bandgap in Chiral Nematics

2011 ◽  
Vol 181-182 ◽  
pp. 257-260
Author(s):  
David Statman ◽  
Andrew Jockers ◽  
Daniel Brennan
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Azo Dyes ◽  
Azo Dye ◽  
Photonic Bandgap ◽  
Methyl Red ◽  
Central Wavelength ◽  
Chiral Nematic ◽  
Anchoring Energy ◽  
Pitch Length

Chiral nematic liquid crystals prepared with Grandjean texture demonstrate a photonic bandgap whose central wavelength is proportional to the pitch length, P, of the liquid crystal and whose width is given by (ne – no)P. We show that methyl red doped chiral nematics undergo a shift in the photonic bandgap upon photo-isomerization. This shift is a result of (1) photo-induced change in anchoring energy on the nematic surface, and (2) change in the natural pitch length from the photo-isomerization of the azo dye.

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