Approach to a second-order nematic-isotropic phase transition in a lyotropic liquid crystal

1984 ◽  
Vol 29 (2) ◽  
pp. 1010-1012 ◽  
Author(s):  
Charles Rosenblatt ◽  
Satyendra Kumar ◽  
J. D. Litster
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Second Order ◽  
Lyotropic Liquid Crystal ◽  
Isotropic Phase

Study on Amphiphilic Molecules’ Self-Assembling into Lamellar Phase Process

2010 ◽  
Vol 663-665 ◽  
pp. 751-754
Author(s):  
Yuan Ming Huang ◽  
Wei Wei Liu
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Lamellar Phase ◽  
Lyotropic Liquid Crystal ◽  
Isotropic Phase ◽  
Self Assembling ◽  
Amphiphilic Molecules ◽  
Maltese Cross ◽  
Phase Process ◽  
Cross Structure

Amphiphilic molecules self-assemble lamellar phase process in lyotropic liquid crystal formed by liquid dishwash was investigated with optical microscopy as concentration increases from its isotropic phase to its lamellar phase. We demonstrated that liquid dishwash molecules could assemble themselves into lamellar phase when their concentration increases between one pieces of glass substrate. We discussed the formative processes of Maltese-cross structure and phase transition from isotropic to lamellar phase.

Inversion in the change of the refractive index and memory effect near the nematic-isotropic phase transition in a lyotropic liquid crystal

2000 ◽  
Vol 61 (5) ◽  
pp. 5410-5413 ◽  
Author(s):  
J. R. D. Pereira ◽  
A. J. Palangana ◽  
A. M. Mansanares ◽  
E. C. da Silva ◽  
A. C. Bento ◽  
...  
Keyword(s):  
Phase Transition ◽  
Refractive Index ◽  
Liquid Crystal ◽  
Memory Effect ◽  
Lyotropic Liquid Crystal ◽  
Isotropic Phase

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)’.

Sign in / Sign up

Export Citation Format

Share Document