Cholesteric liquid crystal formation in suspensions of cellulose nanocrystals

2016 ◽  
pp. 871-897 ◽  
Author(s):  
Camilla Honorato-Rios ◽  
Johanna Bruckner ◽  
Christina Schütz ◽  
Sammy Wagner ◽  
Zornitza Tosheva ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Cellulose Nanocrystals ◽  
Cholesteric Liquid Crystal ◽  
Crystal Formation

scholarly journals From Equilibrium Liquid Crystal Formation and Kinetic Arrest to Photonic Bandgap Films Using Suspensions of Cellulose Nanocrystals

Crystals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 199 ◽  
Author(s):  
Christina Schütz ◽  
Johanna R. Bruckner ◽  
Camila Honorato-Rios ◽  
Zornitza Tosheva ◽  
Manos Anyfantakis ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Cellulose Nanocrystals ◽  
Cholesteric Liquid Crystal ◽  
Water Evaporation ◽  
Isotropic Phase ◽  
Crystal Formation ◽  
Scientists And Engineers ◽  
Coffee Ring Effect ◽  
Kinetic Arrest ◽  
First Time

The lyotropic cholesteric liquid crystal phase developed by suspensions of cellulose nanocrystals (CNCs) has come increasingly into focus from numerous directions over the last few years. In part, this is because CNC suspensions are sustainably produced aqueous suspensions of a fully bio-derived nanomaterial with attractive properties. Equally important is the interesting and useful behavior exhibited by solid CNC films, created by drying a cholesteric-forming suspension. However, the pathway along which these films are realized, starting from a CNC suspension that may have low enough concentration to be fully isotropic, is more complex than often appreciated, leading to reproducibility problems and confusion. Addressing a broad audience of physicists, chemists, materials scientists and engineers, this Review focuses primarily on the physics and physical chemistry of CNC suspensions and the process of drying them. The ambition is to explain rather than to repeat, hence we spend more time than usual on the meanings and relevance of the key colloid and liquid crystal science concepts that must be mastered in order to understand the behavior of CNC suspensions, and we present some interesting analyses, arguments and data for the first time. We go through the development of cholesteric nuclei (tactoids) from the isotropic phase and their potential impact on the final dry films; the spontaneous CNC fractionation that takes place in the phase coexistence window; the kinetic arrest that sets in when the CNC mass fraction reaches ∼10 wt.%, preserving the cholesteric helical order until the film has dried; the ’coffee-ring effect’ active prior to kinetic arrest, often ruining the uniformity in the produced films; and the compression of the helix during the final water evaporation, giving rise to visible structural color in the films.

New liquid crystal formation induced by nanoscale phase separation composed of bent-core liquid crystal and rod-like cholesteric liquid crystal mixtures

Soft Matter ◽  
2021 ◽  
Author(s):  
Yoichi Takanishi
Keyword(s):  
Liquid Crystal ◽  
Phase Separation ◽  
Liquid Crystals ◽  
Small Angle ◽  
Cholesteric Liquid Crystal ◽  
Crystal Formation ◽  
Nano Structure ◽  
X Ray ◽  
Nanoscale Phase Separation ◽  
X Ray Scattering

Herein, the local nano-structure in mixtures of cholesteric liquid crystals and a bent-core molecule was analyzed via the small-angle X-ray scattering.

scholarly journals Construction of Functional Materials in Various Material Forms from Cellulosic Cholesteric Liquid Crystals

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2969
Author(s):  
Kazuma Miyagi ◽  
Yoshikuni Teramoto
Keyword(s):  
Liquid Crystal ◽  
Physicochemical Properties ◽  
Mesoporous Materials ◽  
Cellulose Nanocrystals ◽  
Cholesteric Liquid Crystal ◽  
Functional Materials ◽  
Cellulose Derivatives ◽  
Sustainable Society ◽  
Wide Range ◽  
Material Form

Wide use of bio-based polymers could play a key role in facilitating a more sustainable society because such polymers are renewable and ecofriendly. Cellulose is a representative bio-based polymer and has been used in various materials. To further expand the application of cellulose, it is crucial to develop functional materials utilizing cellulosic physicochemical properties that are acknowledged but insufficiently applied. Cellulose derivatives and cellulose nanocrystals exhibit a cholesteric liquid crystal (ChLC) property based on rigidity and chirality, and this property is promising for constructing next-generation functional materials. The form of such materials is an important factor because material form is closely related with function. To date, researchers have reported cellulosic ChLC materials with a wide range of material forms—such as films, gels, mesoporous materials, and emulsions—for diverse functions. We first briefly review the fundamental aspects of cellulosic ChLCs. Then we comprehensively review research on cellulosic ChLC functional materials in terms of their material forms. Thus, this review provides insights into the creation of novel cellulosic ChLC functional materials based on material form designed toward the expanded application of cellulosics.

Dispersion of proton spin-lattice relaxation in a cholesteric liquid crystal

1983 ◽  
Vol 44 (10) ◽  
pp. 1179-1184 ◽  
Author(s):  
M. Vilfan ◽  
R. Blinc ◽  
J. Dolinšek ◽  
M. Ipavec ◽  
G. Lahajnar ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Cholesteric Liquid Crystal ◽  
Lattice Relaxation ◽  
Proton Spin ◽  
Spin Lattice Relaxation ◽  
Spin Lattice

scholarly journals Flow-assisted self-healing of the helical structure in a cholesteric liquid crystal

2021 ◽  
Vol 155 (5) ◽  
pp. 054903
Author(s):  
Jan-Christoph Eichler ◽  
Robert A. Skutnik ◽  
Marco G. Mazza ◽  
Martin Schoen
Keyword(s):  
Liquid Crystal ◽  
Cholesteric Liquid Crystal ◽  
Helical Structure ◽  
Self Healing

scholarly journals The temperature dependence of the helical pitch in a cholesteric liquid crystal

2021 ◽  
pp. e1881638
Author(s):  
Robert A. Skutnik ◽  
Jan-Christoph Eichler ◽  
Marco G. Mazza ◽  
Martin Schoen
Keyword(s):  
Liquid Crystal ◽  
Temperature Dependence ◽  
Cholesteric Liquid Crystal ◽  
Helical Pitch

Electrically tunable cholesteric liquid crystal lines defects

2021 ◽  
Vol 114 ◽  
pp. 110960
Author(s):  
Lotfi Saadaoui ◽  
Ridha Hamdi
Keyword(s):  
Liquid Crystal ◽  
Cholesteric Liquid Crystal
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