scholarly journals Chiral Liquid Crystals: Chiral Reaction Field with Thermally Invertible Helical Sense that Controls the Helicities of Conjugated Polymers (Adv. Mater. 12/2020)

2020 ◽  
Vol 32 (12) ◽  
pp. 2070092
Author(s):  
Kazuo Akagi ◽  
Tomohiro Yamashita ◽  
Keita Horie ◽  
Munju Goh ◽  
Masaharu Yamamoto
Keyword(s):  
Liquid Crystals ◽  
Conjugated Polymers ◽  
Reaction Field ◽  
Chiral Liquid Crystals

A 2*2 fiber optic switch using chiral liquid crystals

1990 ◽  
Vol 2 (2) ◽  
pp. 147-149 ◽  
Author(s):  
N.K. Shankar ◽  
J.A. Morris ◽  
C.P. Yakymyshyn ◽  
C.R. Pollock
Keyword(s):  
Liquid Crystals ◽  
Fiber Optic ◽  
Chiral Liquid Crystals

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.

OPTICAL ACTIVITY AND LIGHT SCATTERING IN HIGHLY CHIRAL LIQUID CRYSTALS

1992 ◽  
Vol 06 (08) ◽  
pp. 425-446 ◽  
Author(s):  
PETER J. COLLINGS
Keyword(s):  
Liquid Crystals ◽  
Light Scattering ◽  
Optical Activity ◽  
Smectic A ◽  
Scattering Effects ◽  
Smectic A Phase ◽  
Blue Phases ◽  
Chiral Liquid Crystals

Theoretical and experimental optical activity and light scattering work in highly chiral liquid crystals is reviewed, starting from the early studies twenty years ago and ending with the most current investigations. Pretransitional effects in the isotropic and smectic A phases of highly chiral liquid crystals are discussed, as well as optical activity and light scattering effects in both the blue phases and smectic A * phase.

Photochromic Chiral Liquid Crystals for Light Sensing

2017 ◽  
pp. 33-62 ◽  
Author(s):  
Ling Wang ◽  
Karla G. Gutierrez-Cuevas ◽  
Quan Li
Keyword(s):  
Liquid Crystals ◽  
Light Sensing ◽  
Chiral Liquid Crystals
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