Multifunctional chiral nematic cellulose nanocrystals/glycerol structural colored nanocomposites for intelligent responsive films, photonic inks and iridescent coatings

2018 ◽  
Vol 6 (20) ◽  
pp. 5391-5400 ◽  
Author(s):  
Mingcong Xu ◽  
Wei Li ◽  
Chunhui Ma ◽  
Haipeng Yu ◽  
Yiqiang Wu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Crystal Structures ◽  
Cellulose Nanocrystals ◽  
Structural Features ◽  
Chiral Nematic

Structural colored nanocomposites with photonic liquid crystal structures are desirable owing to their excellent optical performances, unique structural features and intelligent responsive behaviors.

scholarly journals Surface-Mediated Alignment of Long Pitch Chiral Nematic Liquid Crystal Structures

2018 ◽  
Vol 6 (13) ◽  
pp. 1800070 ◽  
Author(s):  
Inge Nys ◽  
Jeroen Beeckman ◽  
Kristiaan Neyts
Keyword(s):  
Liquid Crystal ◽  
Crystal Structures ◽  
Nematic Liquid Crystal ◽  
Chiral Nematic

scholarly journals Chiral amplification in a cyanobiphenyl nematic liquid crystal doped with helicene-like derivatives

2009 ◽  
Vol 5 ◽  
Author(s):  
Alberta Ferrarini ◽  
Silvia Pieraccini ◽  
Stefano Masiero ◽  
Gian Piero Spada
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Geometry Optimization ◽  
Structural Features ◽  
Simple Relationship ◽  
Chiral Amplification ◽  
Molecular Chirality ◽  
Chiral Nematic ◽  
Axially Chiral ◽  
Conformational Freedom

The addition of a chiral non-racemic dopant to a nematic liquid crystal (LC) has the effect of transferring the molecular chirality to the phase organization and a chiral nematic phase is formed. This molecular chirality amplification in the LC provides a unique possibility for investigating the relationship between molecular structure, intermolecular interactions, and mesoscale organization. It is known that axially chiral or helical-shaped molecules with reduced conformational disorder are good candidates for high helical twisting power derivatives. In particular, biaryl derivatives are known to be efficient chiral inducers in biaryl nematic mesophases. In this paper, we focus on a new series of helicene-like molecules of known absolute configuration. We have integrated cholesteric pitch measurements with geometry optimization by DFT calculations and analysis of the twisting ability by the Surface Chirality model to shed light on the structural features responsible for the analogies and differences exhibited by these derivatives. The investigation of these dopants with well-defined geometry, by virtue of the low conformational freedom, and the substituents variously distributed around the core, allows us to extend our knowledge of the molecular origin of the chirality amplification in liquid crystals and to confirm the simple relationship “molecular P-helicity” → “cholesteric P-handedness” for helical-shaped helicene-like derivatives.

scholarly journals Expanding the upper limits of robustness of cellulose nanocrystal aerogels: outstanding mechanical performance and associated pore compression response of chiral-nematic architectures

2019 ◽  
Vol 7 (25) ◽  
pp. 15309-15319 ◽  
Author(s):  
Anurodh Tripathi ◽  
Blaise L. Tardy ◽  
Saad A. Khan ◽  
Falk Liebner ◽  
Orlando J. Rojas
Keyword(s):  
Liquid Crystal ◽  
Cellulose Nanocrystals ◽  
Mechanical Performance ◽  
Cellulose Nanocrystal ◽  
Chiral Nematic ◽  
Upper Limits

Anisotropy in liquid crystal dispersions of cellulose nanocrystals is demonstrated to drastically enhance the mechanical attributes of derived aerogels.

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.

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