Characteristics of selective reflection of chiral nematic liquid crystalline gels with a nonuniform pitch distribution

2007 ◽  
Vol 91 (20) ◽  
pp. 201908 ◽  
Author(s):  
Zhenyu Bian ◽  
Kexuan Li ◽  
Wei Huang ◽  
Hui Cao ◽  
Huai Yang ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Selective Reflection ◽  
Chiral Nematic

Vitrified Chiral−Nematic Liquid Crystalline Films for Selective Reflection and Circular Polarization

1999 ◽  
Vol 11 (6) ◽  
pp. 1590-1596 ◽  
Author(s):  
Dimitris Katsis ◽  
Philip H. M. Chen ◽  
John C. Mastrangelo ◽  
Shaw H. Chen ◽  
Thomas N. Blanton
Keyword(s):  
Circular Polarization ◽  
Liquid Crystalline ◽  
Selective Reflection ◽  
Chiral Nematic ◽  
Crystalline Films

Study on selective reflection properties of chiral nematic liquid crystalline composites with a non‐uniform pitch distribution

2008 ◽  
Vol 35 (11) ◽  
pp. 1313-1320 ◽  
Author(s):  
Wei Huang ◽  
Zhenyu Bian ◽  
Kexuan Li ◽  
Jiumei Xiao ◽  
Hui Cao ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Selective Reflection ◽  
Chiral Nematic

scholarly journals Concentric chiral nematic polymeric fibers from cellulose nanocrystals

2021 ◽  
Author(s):  
Arash Momeni ◽  
Christopher M. Walters ◽  
Yi-Tao Xu ◽  
Wadood Y. Hamad ◽  
Mark J. MacLachlan
Keyword(s):  
Cellulose Nanocrystals ◽  
Liquid Crystalline ◽  
Capillary Tube ◽  
Single Domain ◽  
Cellulose Nanocrystal ◽  
Polymeric Fibers ◽  
Chiral Nematic ◽  
Chiral Nematic Structure ◽  
Crystalline Suspension

A cellulose nanocrystal liquid crystalline suspension was mixed with monomers and confined to a capillary tube. After photopolymerization, a fiber with a single-domain concentric chiral nematic structure throughout the length of the fiber was obtained.

PBLG as a versatile liquid crystalline medium for anisotropic NMR data acquisition

2019 ◽  
Vol 55 (30) ◽  
pp. 4327-4330 ◽  
Author(s):  
Ikenna E. Ndukwe ◽  
Xiao Wang ◽  
István Pelczer ◽  
Mikhail Reibarkh ◽  
R. Thomas Williamson ◽  
...  
Keyword(s):  
Data Acquisition ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Solvent System ◽  
High Quality ◽  
Nmr Data ◽  
Chiral Nematic ◽  
Liquid Crystalline Medium ◽  
Crystalline Medium

The chiral nematic phase of poly-γ-benzyl-l-glutamate (PBLG) formed in a chloroform–DMSO co-solvent system can be used as a versatile alignment medium for the acquisition of high quality anisotropic NMR data for molecules of varying polarities.

scholarly journals Synthesis and Characterization of Photoluminescence Liquid Crystals Based on Flexible Chain-Bearing Pentafluorinated Bistolanes

Crystals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 603
Author(s):  
Shigeyuki Yamada ◽  
Masaya Sato ◽  
Tsutomu Konno
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Oxygen Atom ◽  
Liquid Crystalline ◽  
Color Change ◽  
Photophysical Properties ◽  
Structure Property ◽  
Flexible Chain ◽  
Structure Property Relationships ◽  
Chiral Nematic

The liquid-crystalline (LC) and photophysical properties of molecules are very sensitive to their electronic and molecular aggregate structures. Herein, to shed light on the structure–property relationships of pentafluorinated bistolane-based photoluminescence (PL) liquid crystals (PLLCs) previously reported by our group, we synthesized pentafluorinated bistolanes with variable flexible chains and evaluated their LC and photophysical properties. The incorporation of an oxygen atom (to afford a 2-methoxyethoxy unit) or an oxygen atom and a methyl group (to afford a 1-methoxyprop-2-oxy unit) into the flexible butoxy chain significantly decreased the temperature of the crystalline-to-LC phase transition, and a chiral nematic phase comprising helical molecular aggregates was observed for the chiral 1-methoxyprop-2-oxy group–bearing bistolane. The synthesized bistolanes exhibited strong blue PL in both solution and crystalline phases; the featuring PL characteristics were maintained in the LC phase (produced by the crystalline-to-LC phase transition) except for a slight PL color change. Thus, it was concluded that the PL behavior of pentafluorinated bistolanes can be modulated by the choice of a suitable flexible chain, and the obtained insights are believed to facilitate the application of PLLCs in thermosensing PL materials.

Study of Casting Self-Colored Liquid Crystalline Solid Films of Hydroxypropyl Cellulose

2013 ◽  
Vol 341-342 ◽  
pp. 217-220
Author(s):  
Qin Xing Zhang ◽  
Li Qian ◽  
Li Xia Wang ◽  
S. Stuto ◽  
Chang Yu Shen
Keyword(s):  
Visible Light ◽  
Liquid Crystalline ◽  
Solution Concentration ◽  
Hydroxypropyl Cellulose ◽  
Crystalline Solid ◽  
Selective Reflection ◽  
Solid Films ◽  
Colored Coating ◽  
Cooling Velocity ◽  
Cholesteric Liquid Crystalline

Solutions of lyotropic cholesteric liquid crystalline hydroxypropyl cellulose (HPC) in water would be self-colored due to the selective reflection of visible light, depending on the solution concentration. Colored coating of the liquid crystalline aqueous HPC solutions was attempted to apply. HPC solid films were found which could cast from the liquid crystalline solutions at different conditions such as solution concentration and different drying temperature. Experiments show that both solution concentration and cooling velocity play an important effect in controlling the color of HPC films.

Synthesis and Phase Behavior of Chiral Liquid Crystal Elastomers Containing Cholesteryl Group

2012 ◽  
Vol 554-556 ◽  
pp. 807-810 ◽  
Author(s):  
Ying Gang Jia ◽  
Kun Ming Song ◽  
Bao Yan Zhang
Keyword(s):  
Phase Behavior ◽  
Liquid Crystalline ◽  
Crosslinking Agent ◽  
Side Chain ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Selective Reflection ◽  
Cholesteric Phase ◽  
Liquid Crystal Elastomers ◽  
Cholesteric Liquid Crystalline

The synthesis of new side chain cholesteric liquid crystalline elastomers (ChLCEs) containing the cholesteric monomer M and the flexible non-mesogenic crosslinking agent C, is described. The selective reflection of light for M was characterized with UV/Visible/NIR. The phase behavior and mesomorphism were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffraction (XRD). The effect of the content of crosslinking units on the phase behavior and mesomorphism of elastomers P1– P8is discussed. The ChLCEs exhibit elasticity, reversible phase transitions, and cholesteric Grandjean texture. The experimental results demonstrate that the glass transition temperature and isotropic temperature of ChLCEs decrease with increasing the content of crosslinking unit, but the cholesteric phase is not disturbed.

Nonlinear “brightening” of a film of nonabsorbing chiral nematic under selective reflection conditions

JETP Letters ◽  
1996 ◽  
Vol 63 (6) ◽  
pp. 423-428 ◽  
Author(s):  
S. G. Lukishova ◽  
K. S. Lebedev ◽  
E. A. Magulariya ◽  
S. V. Belyaev ◽  
N. V. Malimonenko ◽  
...  
Keyword(s):  
Selective Reflection ◽  
Chiral Nematic
Sign in / Sign up

Export Citation Format

Share Document