The electro-optical characteristics and applicability evaluation of a photo-induced vertical alignment negative-type liquid crystal/photo-curable acrylic pre-polymer mixture system mixed with chiral smectic A phase liquid crystal

2011 ◽  
Vol 38 (1) ◽  
pp. 65-86 ◽  
Author(s):  
Czung-Yu Ho ◽  
Jiunn-Yih Lee
Keyword(s):  
Liquid Crystal ◽  
Optical Characteristics ◽  
Polymer Mixture ◽  
Vertical Alignment ◽  
Negative Type ◽  
Smectic A ◽  
Smectic A Phase ◽  
Phase Liquid ◽  
Mixture System ◽  
Applicability Evaluation

Periodic electro-optical characteristics of ion-doped Smectic A phase liquid crystals driven by a low-frequency electric field

2018 ◽  
Vol 46 (6) ◽  
pp. 905-912 ◽  
Author(s):  
Shumeng Guo ◽  
Xiao Liang ◽  
Meng Wang ◽  
Cuihong Zhang ◽  
Lanying Zhang ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Electric Field ◽  
Low Frequency ◽  
Optical Characteristics ◽  
Smectic A ◽  
Smectic A Phase ◽  
Phase Liquid ◽  
Frequency Electric Field

Studies of critical behaviour at the nematic to smectic A phase transition in C6 and C7 binary mixture system

2008 ◽  
Vol 41 (6) ◽  
pp. 062002 ◽  
Author(s):  
SeungYeon Jeong ◽  
DongWoo Kim ◽  
KungWon Rhie ◽  
MunPyo Hong ◽  
Satyendra Kumar ◽  
...  
Keyword(s):  
Phase Transition ◽  
Binary Mixture ◽  
Critical Behaviour ◽  
Smectic A ◽  
Smectic A Phase ◽  
Mixture System

Electric-Field-Dependent Tilt (Cone) Angle in a Chiral Smectic C Liquid Crystal Showing Electroclinic Effect in the Smectic A Phase

1991 ◽  
Vol 30 (Part 2, No. 4A) ◽  
pp. L612-L615 ◽  
Author(s):  
Ying-Bao Yang ◽  
Akihiro Mochizuki ◽  
Naoto Nakamura ◽  
Shunsuke Kobayashi
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Cone Angle ◽  
Smectic A ◽  
Smectic C ◽  
Field Dependent ◽  
Smectic A Phase

scholarly journals Optical Microscopy Observations and Construction of Dupin Cyclides at the Isotropic/Smectic A Phase Transition

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4539
Author(s):  
Mikhael Halaby Macary ◽  
Gauthier Damême ◽  
Antoine Gibek ◽  
Valentin Dubuffet ◽  
Benoît Dupuy ◽  
...  
Keyword(s):  
Phase Transition ◽  
Numerical Simulation ◽  
Liquid Crystal ◽  
Optical Microscopy ◽  
Smectic A ◽  
Polarized Microscopy ◽  
Smectic A Phase ◽  
Dupin Cyclides

In this work, we are interested in the nucleation of bâtonnets at the Isotropic/Smectic A phase transition of 10CB liquid crystal. Very often, these bâtonnets are decorated with a large number of focal conics. We present here an example of a bâtonnet obtained by optical crossed polarized microscopy in a frequently observed particular area of the sample. This bâtonnet presents bulges and one of them consists of a tessellation of ellipses. These ellipses are two by two tangent, one to each other, and their confocal hyperbolas merge at the apex of the bâtonnet. We propose a numerical simulation with Python software to reproduce this tiling of ellipses as well as the shape of the smectic layers taking the well-known shape of Dupin cyclides within this particular bâtonnet area.

scholarly journals Gram-scale preparation of negative-type liquid crystals with a CF2CF2-carbocycle unit via an improved short-step synthetic protocol

2018 ◽  
Vol 14 ◽  
pp. 148-154 ◽  
Author(s):  
Tatsuya Kumon ◽  
Shohei Hashishita ◽  
Takumi Kida ◽  
Shigeyuki Yamada ◽  
Takashi Ishihara ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Vertical Alignment ◽  
Display Devices ◽  
Negative Type ◽  
Scale Preparation

Herein, we demonstrate an improved short-step protocol for the synthesis of multicyclic molecules having a CF2CF2-containing cyclohexadiene or cyclohexane framework in a mesogenic structure. These molecules are promising candidates for vertical alignment (VA)-mode liquid crystal (LC) display devices owing to their large negative dielectric constant. The tetrafluorinated multicyclic molecules were successfully obtained in only five or six reaction steps without the need for special handling techniques, as is generally required for thermally unstable organometallic species, representing a reduction of three reaction steps. The improved short-step synthetic protocol was also amenable to the multigram preparation of these promising molecules, which may contribute significantly to the development of novel negative-type LC molecules containing CF2CF2 carbocycles.

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