Behavior of a Deionized Liquid Crystal Subjected to Unipolar Injection in Nematic and Isotropic Phase

1972 ◽  
Vol 20 (7) ◽  
pp. 251-253 ◽  
Author(s):  
Jean‐Claude Lacroix ◽  
Robert Tobazéon
Keyword(s):  
Liquid Crystal ◽  
Isotropic Phase ◽  
Unipolar Injection

scholarly journals Dissipative structures induced by photoisomerization in a dye-doped nematic liquid crystal layer

2018 ◽  
Vol 376 (2135) ◽  
pp. 20170382 ◽  
Author(s):  
I. Andrade-Silva ◽  
U. Bortolozzo ◽  
C. Castillo-Pinto ◽  
M. G. Clerc ◽  
G. González-Cortés ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Dissipative Structures ◽  
Input Power ◽  
Isotropic Phase ◽  
Crystal Layer ◽  
Liquid Crystal Layer ◽  
Nematic Liquid Crystal Layer ◽  
Interface Propagation

Order–disorder phase transitions driven by temperature or light in soft matter materials exhibit complex dissipative structures. Here, we investigate the spatio-temporal phenomena induced by light in a dye-doped nematic liquid crystal layer. Experimentally, for planar anchoring of the nematic layer and high enough input power, photoisomerization processes induce a nematic–isotropic phase transition mediated by interface propagation between the two phases. In the case of a twisted nematic layer and for intermediate input power, the light induces a spatially modulated phase, which exhibits stripe patterns. The pattern originates as an instability mediated by interface propagation between the modulated and the homogeneous nematic states. Theoretically, the phase transition, emergence of stripe patterns and front dynamics are described on the basis of a proposed model for the dopant concentration coupled with the nematic order parameter. Numerical simulations show quite a fair agreement with the experimental observations. This article is part of the theme issue ‘Dissipative structures in matter out of equilibrium: from chemistry, photonics and biology (part 2)’.

scholarly journals Kinetics of Nematic to Isotropic Phase Transition in Liquid Crystal Doped with Magnetic Nanoparticles

2017 ◽  
Vol 131 (4) ◽  
pp. 949-951 ◽  
Author(s):  
K. Csach ◽  
A. Juríková ◽  
J. Miškuf ◽  
N. Tomašovičová ◽  
V. Gdovinová ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Magnetic Nanoparticles ◽  
Isotropic Phase ◽  
Kinetics Of

Viscosity coefficients in the isotropic phase of a nematic liquid crystal

1977 ◽  
Vol 38 (2) ◽  
pp. 159-162 ◽  
Author(s):  
P. Martinoty ◽  
F. Kiry ◽  
S. Nagai ◽  
S. Candau ◽  
F. Debeauvais
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Isotropic Phase ◽  
Viscosity Coefficients
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