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

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)’.

Induction of orientational order in the isotropic phase of a nematic liquid crystal

2001 ◽  
Vol 64 (2) ◽  
Author(s):  
M. Simões ◽  
P. R. Fernandes ◽  
A. J. Palangana ◽  
S. M. Domiciano
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Orientational Order ◽  
Isotropic Phase

Pretransitional behavior in the isotropic phase of a nematic liquid crystal with the transverse permanent dipole moment

2006 ◽  
Vol 124 (14) ◽  
pp. 144907 ◽  
Author(s):  
Malgorzata Janik ◽  
Sylwester J. Rzoska ◽  
Aleksandra Drozd-Rzoska ◽  
J. Zioło ◽  
Pawel Janik ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Permanent Dipole Moment ◽  
Isotropic Phase

Ultrasonic investigation of viscosity coefficients in the nematic liquid crystal, EBBA

1975 ◽  
Vol 63 (12) ◽  
pp. 5139-5144 ◽  
Author(s):  
S. E. Monroe ◽  
G. C. Wetsel ◽  
M. R. Woodard ◽  
B. A. Lowry
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Viscosity Coefficients ◽  
Ultrasonic Investigation
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