Influence of a Change in Helical Twisting Power of Photoresponsive Chiral Dopants on Rotational Manipulation of Micro-Objects on the Surface of Chiral Nematic Liquid Crystalline Films

2012 ◽  
Vol 18 (39) ◽  
pp. 12337-12348 ◽  
Author(s):  
Reji Thomas ◽  
Yohei Yoshida ◽  
Takehito Akasaka ◽  
Nobuyuki Tamaoki
Keyword(s):  
Liquid Crystalline ◽  
Chiral Nematic ◽  
Crystalline Films ◽  
Chiral Dopants ◽  
Helical Twisting Power

A Novel Nematic-Like Mesophase Induced in Dimers, Trimers and Tetramers Doped with a Highly Chiral Additive

2018 ◽  
Author(s):  
Richard Mandle ◽  
John W. Goodby
Keyword(s):  
Liquid Crystalline ◽  
Binary Liquid ◽  
Modulated Phases ◽  
Chiral Nematic ◽  
Wide Range ◽  
State Of Matter ◽  
Chiral Dopants ◽  
Bend Angles ◽  
Helical Twisting Power ◽  
Selection Of

<p>From the observation of a previously undiscovered nematic-like mesophase (N<sub>X</sub>) by Archbold <i>et al</i>, we report on several new binary liquid-crystalline mixtures between the high helical twisting power dopant RM1041 and a selection of dimers with varying average bend angles and conformational landscapes. We also report on mixtures between RM1041 and oligomeric LC materials. We find that dimers and oligomers exhibit not only chiral nematic and twist-bend modulated phases, but also the same N<sub>X</sub> phase reported by Archbold, indicating that this state of matter (the structure of which is yet to be definitively characterised) is exhibited by a wide range of materials. Mixtures of the dimer <i>CB9CB</i> with a selection of different chiral dopants suggest that it is the helical twisting power of the chiral additive that is responsible incidence of the N<sub>X </sub>phase.</p>

A Novel Nematic-Like Mesophase Induced in Dimers, Trimers and Tetramers Doped with a Highly Chiral Additive

2018 ◽  
Author(s):  
Richard Mandle ◽  
John W. Goodby
Keyword(s):  
Liquid Crystalline ◽  
Binary Liquid ◽  
Modulated Phases ◽  
Chiral Nematic ◽  
Wide Range ◽  
State Of Matter ◽  
Chiral Dopants ◽  
Bend Angles ◽  
Helical Twisting Power ◽  
Selection Of

<p>From the observation of a previously undiscovered nematic-like mesophase (N<sub>X</sub>) by Archbold <i>et al</i>, we report on several new binary liquid-crystalline mixtures between the high helical twisting power dopant RM1041 and a selection of dimers with varying average bend angles and conformational landscapes. We also report on mixtures between RM1041 and oligomeric LC materials. We find that dimers and oligomers exhibit not only chiral nematic and twist-bend modulated phases, but also the same N<sub>X</sub> phase reported by Archbold, indicating that this state of matter (the structure of which is yet to be definitively characterised) is exhibited by a wide range of materials. Mixtures of the dimer <i>CB9CB</i> with a selection of different chiral dopants suggest that it is the helical twisting power of the chiral additive that is responsible incidence of the N<sub>X </sub>phase.</p>

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

scholarly journals Polarized Phosphorescence of Isotropic and Metal-Based Clustomesogens Dispersed into Chiral Nematic Liquid Crystalline Films

2015 ◽  
Vol 3 (10) ◽  
pp. 1368-1372 ◽  
Author(s):  
Simon M. Wood ◽  
Marianne Prévôt ◽  
Maria Amela-Cortes ◽  
Stéphane Cordier ◽  
Steve J. Elston ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Chiral Nematic ◽  
Crystalline Films

Liquid crystallinity-embodied imidazolium-based ionic liquids and their chiral mesophases induced by axially chiral tetra-substituted binaphthyl derivatives

2015 ◽  
Vol 3 (16) ◽  
pp. 3960-3970 ◽  
Author(s):  
Sangbum Ahn ◽  
Shohei Yamakawa ◽  
Kazuo Akagi
Keyword(s):  
Ionic Liquids ◽  
Liquid Crystalline ◽  
The Novel ◽  
Liquid Crystallinity ◽  
Chiral Nematic ◽  
Axially Chiral ◽  
Chiral Dopants

The novel liquid crystalline ionic liquids (LCILs) were synthesised by introducing LC chains into both sides of imidazolium derivatives. The LCILs exhibited chiral nematic (N*) phases when the chiral dopants were added to the LCILs.

Synthesis of New Chiral Disubstituted Binaphthol Derivatives and their use as the Chiral Dopants

1996 ◽  
Vol 425 ◽  
Author(s):  
H.-J. Deussen ◽  
P. V. Shibaev ◽  
R. A. Vinokur ◽  
K. Schaumburg ◽  
T. Bjornholm ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Temperature Dependence ◽  
Liquid Crystalline ◽  
Molecular Conformation ◽  
Molecular Model ◽  
Nematic Liquid Crystals ◽  
Spatially Extended ◽  
Chiral Dopants ◽  
Helical Twisting Power

AbstractA number of new chiral binaphthol (BN) derivatives with different substituents in the 6,6'-positions in open and bridged forms have been synthesized. Their possible liquid crystalline properties and their helical twisting power (B) of three different nematic liquid crystals (LCs) were investigated. Derivatives with spatially extended substituents in the 6,6'-positions (e.g. styryl or vinil) show unusual high helical twisting power (up to 120 μm–1). A direct correlation between the magnitude of β and the length of the substituents was found.From the different temperature dependence of β of the open and bridged BNs, a molecular model was developed relating the molecular conformation and twisting power

Circularly polarized fluorescence from chiral nematic liquid crystalline films: theory and experiment

1998 ◽  
Vol 24 (2) ◽  
pp. 163-172 ◽  
Author(s):  
HONGQIN SHI ◽  
BROOKE M. CONGER ◽  
DIMITRIS KATSIS ◽  
SHAW H. CHEN
Keyword(s):  
Liquid Crystalline ◽  
Polarized Fluorescence ◽  
Circularly Polarized ◽  
Chiral Nematic ◽  
Crystalline Films ◽  
Theory And Experiment

Theory of Circularly Polarized Light Emission from Chiral Nematic Liquid Crystalline Films

1996 ◽  
Vol 425 ◽  
Author(s):  
H. Shi ◽  
S. H. Chen
Keyword(s):  
Experimental Data ◽  
Film Thickness ◽  
Liquid Crystalline ◽  
Light Emission ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Chiral Nematic ◽  
Polarized Emission ◽  
Crystalline Films

AbstractChiral nematic liquid crystalline films with fluorescent chromophores are capable of circularly polarized emission. A theory is presented in which the effects of anisotropic absorption and film thickness are accounted for. The predicted dissymmetry factor is compared with experimental data reported by Stegemeyer et al. and with the theory for the two limiting cases treated by Pollmann et al.

Polarized Fluorescence from Vitrified Liquid Crystalline Films

1996 ◽  
Vol 425 ◽  
Author(s):  
Brooke M. Conger ◽  
H. Shi ◽  
S. H. Chen ◽  
T. Tsutsui
Keyword(s):  
Liquid Crystal ◽  
Linear Polarization ◽  
Order Parameter ◽  
Liquid Crystalline ◽  
Emission Spectra ◽  
Polarized Fluorescence ◽  
Circularly Polarized ◽  
Chiral Nematic ◽  
Polarization Factor ◽  
Crystalline Films

AbstractLinearly and circularly polarized photoluminescence (PL) were observed from neat vitrified liquid crystal (LC) films. Electronic properties of the compounds were investigated through measurement of absorption and emission spectra in solution and in film. The nematic film exhibited a polarization factor (linear polarization) of 2.8 at an order parameter of 0.70, whereas the chiral nematic film gave rise to an absolute dissymmetry factor (circular polarization) of 0.27 at an order parameter of 0.54.

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.

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