Synchronization of hydrodynamic and orientational modes during electroconvection in a nematic liquid crystal

2012 ◽  
Vol 9 (2) ◽  
pp. 22-26
Author(s):  
E.S. Batyrshin ◽  
V.A. Delev
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Applied Voltage ◽  
Spatiotemporal Dynamics ◽  
Hydrodynamic Modes ◽  
Twist Mode ◽  
Combined Action ◽  
Dc Component

Spatiotemporal dynamics of oscillating electroconvective structures in a nematic liquid crystal during the combined action of AC and DC electric voltages were experimentally studied. It was found that the increase of DC component of the applied voltage leads to the synchronization of the hydrodynamic modes with the orientational twist mode. The results indicate the flexoelectric mechanism of synchronization.

scholarly journals Diffraction and Polarization Properties of Electrically–Tunable Nematic Liquid Crystal Grating

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1929 ◽  
Author(s):  
Shuan-Yu Huang ◽  
Bing-Yau Huang ◽  
Chi-Chung Kang ◽  
Chie-Tong Kuo
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Electric Fields ◽  
Applied Voltage ◽  
Incident Beam ◽  
Electrode Structure ◽  
First Order ◽  
External Electric Fields ◽  
Order Diffraction ◽  
Liquid Crystal Grating

This work demonstrates an electrically-tunable nematic liquid crystal (NLC) diffraction grating with a periodic electrode structure, and discusses the polarization properties of its diffraction. The efficiency of the first-order diffraction can be gradually controlled by applying external electric fields cross the NLC, and the maximum diffraction efficiency of the first-order diffraction that can be obtained is around 12.5% under the applied voltage of 5.0 V. In addition to the applied electric field, the efficiency of the first-order diffraction can also vary by changing the polarized state of the incident beam. Antisymmetric polarization states with symmetrical intensities in the diffractions corresponding to the +1 and −1 order diffraction signals are also demonstrated.

Fundamental Research on Development of Micro-Actuator Driven by Liquid Crystal

2012 ◽  
Vol 490-495 ◽  
pp. 3150-3154 ◽  
Author(s):  
Zhan Zhe Zhang ◽  
Gang Li
Keyword(s):  
Liquid Crystal ◽  
Constitutive Equation ◽  
Nematic Liquid Crystal ◽  
Applied Voltage ◽  
Liquid Crystalline ◽  
Parallel Plates ◽  
Micro Actuator ◽  
Fundamental Research ◽  
Micro Actuators

For the purpose of developing liquid crystalline micro-actuators, the transient behaviors of a nematic liquid crystal between two parallel plates have been computed for various parameters such as applied voltage, the gap between the plates, and the twist and tilt angles at the plates. The Leslie–Ericksen theory has been selected as a constitutive equation. As conclusion of this study, we can develop micro-actuators with arbitrary characteristics by suitably controlling the applied voltage, the size of the actuators, and the director anchoring conditions.

scholarly journals Decomposition vs. escape of topological defects in a nematic liquid crystal

Soft Matter ◽  
2017 ◽  
Vol 13 (45) ◽  
pp. 8442-8450 ◽  
Author(s):  
Bryce S. Murray ◽  
Samo Kralj ◽  
Charles Rosenblatt
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Applied Voltage ◽  
Topological Defects ◽  
Cell Thickness

Nematic cells patterned with square arrays of strength m = ±1 topological defects were examined as a function of cell thickness (3 < h < 7.5 μm), temperature, and applied voltage.

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