Nearly-second-order nematic-isotropic phase transition in a cyclic thermotropic liquid crystal

1993 ◽  
Vol 48 (1) ◽  
pp. R1-R4 ◽  
Author(s):  
Jian-Feng Li ◽  
Virgil Percec ◽  
Charles Rosenblatt
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Second Order ◽  
Isotropic Phase ◽  
Thermotropic Liquid Crystal

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

Reversible microscale assembly of nanoparticles driven by the phase transition of a thermotropic liquid crystal

2017 ◽  
Author(s):  
Niamh Mac Fhionnlaoich ◽  
Stephen Schrettl ◽  
Nicholas B. Tito ◽  
Ye Yang ◽  
Malavika Nair ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Self Assembly ◽  
Nematic Phase ◽  
Hierarchical Control ◽  
Building Blocks ◽  
Model System ◽  
Microscopic Level ◽  
Reversible Process ◽  
Thermotropic Liquid Crystal

The arrangement of nanoscale building blocks into patterns with microscale periodicity is challenging to achieve via self-assembly processes. Here, we report on the phase transition-driven collective assembly of gold nanoparticles in a thermotropic liquid crystal. A temperature-induced transition from the isotropic to the nematic phase leads to the assembly of individual nanometre-sized particles into arrays of micrometre-sized aggregates, whose size and characteristic spacing can be tuned by varying the cooling rate. This fully reversible process offers hierarchical control over structural order on the molecular, nanoscopic, and microscopic level and is an interesting model system for the programmable patterning of nanocomposites with access to micrometre-sized periodicities.

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
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