scholarly journals Two helices from one chiral centre – self organization of disc shaped chiral nanoparticles

2021 ◽  
Author(s):  
Huanan Yu ◽  
Wentao Qu ◽  
Feng Liu ◽  
Georg H. Mehl
Keyword(s):  
Gold Nanoparticles ◽  
Liquid Crystal ◽  
Self Organization ◽  
Helix Formation ◽  
Chiral Nematic

Gold nanoparticles (NPs) were surface functionalized with hexanethiol groups and chiral nematic discogen ligands. A superlattice, liquid crystal behaviour and helix formation of the discs and a second helical organisation of the NPs were detected.

scholarly journals Cholesteric liquid crystal self-organization of gold nanoparticles

Soft Matter ◽  
2011 ◽  
Vol 7 (18) ◽  
pp. 8198 ◽  
Author(s):  
Rajaa Bitar ◽  
Gonzague Agez ◽  
Michel Mitov
Keyword(s):  
Gold Nanoparticles ◽  
Liquid Crystal ◽  
Cholesteric Liquid Crystal ◽  
Self Organization

scholarly journals Gold nanoparticles in a cholesteric liquid crystal matrix: self-organization and localized surface plasmon properties

2012 ◽  
Vol 22 (16) ◽  
pp. 7856 ◽  
Author(s):  
H. Ayeb ◽  
J. Grand ◽  
H. Sellame ◽  
S. Truong ◽  
J. Aubard ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Liquid Crystal ◽  
Surface Plasmon ◽  
Cholesteric Liquid Crystal ◽  
Self Organization ◽  
Localized Surface Plasmon ◽  
Crystal Matrix ◽  
Liquid Crystal Matrix

A robust and inexpensive all optical switch with chiral nematic liquid crystal

2021 ◽  
Vol 119 ◽  
pp. 111306
Author(s):  
Hossein mehrzad ◽  
Ezeddin Mohajerani ◽  
Mohammad Mohammadimasoudi ◽  
Kristiaan Neyts
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Optical Switch ◽  
Chiral Nematic ◽  
All Optical ◽  
All Optical Switch

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.

Optically activated shutter using a photo-tunable short-pitch chiral nematic liquid crystal

2013 ◽  
Vol 103 (10) ◽  
pp. 101105 ◽  
Author(s):  
S. M. Morris ◽  
M. M. Qasim ◽  
K. T. Cheng ◽  
F. Castles ◽  
D.-H. Ko ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Chiral Nematic

scholarly journals Effect of Crosslinkers on Optical and Mechanical Behavior of Chiral Nematic Liquid Crystal Elastomers

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6193
Author(s):  
Kyosun Ku ◽  
Kyohei Hisano ◽  
Kyoko Yuasa ◽  
Tomoki Shigeyama ◽  
Norihisa Akamatsu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Polymer Network ◽  
Molar Ratio ◽  
Stimuli Responsive ◽  
Breaking Strain ◽  
Responsive Materials ◽  
Sensor Applications ◽  
Color Changes ◽  
Chiral Nematic ◽  
Liquid Crystal Elastomers

Chiral nematic (N*) liquid crystal elastomers (LCEs) are suitable for fabricating stimuli-responsive materials. As crosslinkers considerably affect the N*LCE network, we investigated the effects of crosslinking units on the physical properties of N*LCEs. The N*LCEs were synthesized with different types of crosslinkers, and the relationship between the N*LC polymeric system and the crosslinking unit was investigated. The N*LCEs emit color by selective reflection, in which the color changes in response to mechanical deformation. The LC-type crosslinker decreases the helical twisting power of the N*LCE by increasing the total molar ratio of the mesogenic compound. The N*LCE exhibits mechano-responsive color changes by coupling the N*LC orientation and the polymer network, where the N*LCEs exhibit different degrees of pitch variation depending on the crosslinker. Moreover, the LC-type crosslinker increases the Young’s modulus of N*LCEs, and the long methylene chains increase the breaking strain. An analysis of experimental results verified the effect of the crosslinkers, providing a design rationale for N*LCE materials in mechano-optical sensor applications.

scholarly journals Anisotropic shift of surface plasmon resonance of gold nanoparticles doped in nematic liquid crystal

2014 ◽  
Vol 22 (20) ◽  
pp. 24348 ◽  
Author(s):  
Amit Choudhary ◽  
Guoqiang Li
Keyword(s):  
Gold Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Surface Plasmon ◽  
Plasmon Resonance
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