scholarly journals Electrothermal Color Tuning of Cholesteric Liquid Crystals Using Interdigitated Electrode Patterns

2020 ◽  
pp. 2000958
Author(s):  
Arne A. F. Froyen ◽  
Michael Wübbenhorst ◽  
Danqing Liu ◽  
Albert P. H. J. Schenning
Keyword(s):  
Liquid Crystals ◽  
Cholesteric Liquid Crystals ◽  
Interdigitated Electrode ◽  
Color Tuning

Stabilized electrically induced Helfrich deformation and enhanced color tuning in cholesteric liquid crystals

Soft Matter ◽  
2017 ◽  
Vol 13 (46) ◽  
pp. 8728-8735 ◽  
Author(s):  
Meina Yu ◽  
Huai Yang ◽  
Deng-Ke Yang
Keyword(s):  
Liquid Crystals ◽  
Electric Field ◽  
Color Change ◽  
Cholesteric Liquid Crystals ◽  
Color Tuning ◽  
Ac Electric Field ◽  
Reflected Light ◽  
Periodic Layer

When subjected to an AC electric field perpendicular to its layers, the cholesteric planar state may undergo a periodic layer undulation, known as the Helfrich deformation, which generates a color change of the reflected light.

scholarly journals Efficient visible-light full-color tuning of self-organized helical superstructures enabled by fluorinated chiral switches

RSC Advances ◽  
2018 ◽  
Vol 8 (68) ◽  
pp. 38935-38940 ◽  
Author(s):  
Lang Qin ◽  
Wei Gu ◽  
Yingying Chen ◽  
Jia Wei ◽  
Yanlei Yu
Keyword(s):  
Liquid Crystals ◽  
Visible Light ◽  
Blue Light ◽  
Visible Spectrum ◽  
Cholesteric Liquid Crystals ◽  
Color Tuning ◽  
Dynamic Tuning ◽  
Full Color ◽  
Self Organized ◽  
Entire Visible Spectrum

Reversible dynamic tuning of the reflection color from cholesteric liquid crystals within the entire visible spectrum is driven by green and blue light via newly designed chiral switches.

scholarly journals Synthesis and Characterization of Novel Bio-Chiral Dopants Obtained from Bio-Betulin Produced by a Fermentation Process

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 785
Author(s):  
Veridiana G. Guimarães ◽  
Anastasiia Svanidze ◽  
Tianyi Guo ◽  
Pawan Nepal ◽  
Robert J. Twieg ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Natural Product ◽  
Fermentation Process ◽  
Synthesis And Characterization ◽  
Cholesteric Liquid Crystals ◽  
And Performance ◽  
Chiral Dopants

Cholesteric liquid crystals are frequently produced by the addition of chiral dopants to achiral nematic hosts. We report here the synthesis and performance of chiral dopants obtained from bio-betulin produced by a fermentation process. An important aspect of this work is to point out that the fermentation process used to obtain the starting materials is much easier and cheaper when carried out in large volumes than isolating it from the natural product. The performance of the dopants obtained from bio-betulin is indistinguishable from those obtained from commercially available synthetic betulin.

scholarly journals Augmented Lagrangian preconditioners for the Oseen–Frank model of nematic and cholesteric liquid crystals

2021 ◽  
Author(s):  
Jingmin Xia ◽  
Patrick E. Farrell ◽  
Florian Wechsung
Keyword(s):  
Liquid Crystals ◽  
Augmented Lagrangian ◽  
Augmented Lagrangian Method ◽  
Mass Matrix ◽  
Unit Length ◽  
Mesh Size ◽  
Schur Complement ◽  
Cholesteric Liquid Crystals ◽  
Multigrid Algorithm ◽  
The Cost

AbstractWe propose a robust and efficient augmented Lagrangian-type preconditioner for solving linearizations of the Oseen–Frank model arising in nematic and cholesteric liquid crystals. By applying the augmented Lagrangian method, the Schur complement of the director block can be better approximated by the weighted mass matrix of the Lagrange multiplier, at the cost of making the augmented director block harder to solve. In order to solve the augmented director block, we develop a robust multigrid algorithm which includes an additive Schwarz relaxation that captures a pointwise version of the kernel of the semi-definite term. Furthermore, we prove that the augmented Lagrangian term improves the discrete enforcement of the unit-length constraint. Numerical experiments verify the efficiency of the algorithm and its robustness with respect to problem-related parameters (Frank constants and cholesteric pitch) and the mesh size.

scholarly journals Pitch tuning induced by optical torque in heliconical cholesteric liquid crystals

2019 ◽  
Vol 1 (3) ◽  
Author(s):  
G. Nava ◽  
F. Ciciulla ◽  
O. S. Iadlovska ◽  
O. D. Lavrentovich ◽  
F. Simoni ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Cholesteric Liquid Crystals ◽  
Optical Torque

scholarly journals Light-driven rotation of gratings formed by electroconvection patterns in cholesteric liquid crystals

2021 ◽  
pp. 116366
Author(s):  
Ying Xiang ◽  
Hongzhen Jing ◽  
Hao Chen ◽  
Jun zhang ◽  
Xiaoyu Ding ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Cholesteric Liquid Crystals
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