Phase diagram of dissipative structures in the nematic liquid crystal under a.c.-field

1976 ◽  
Vol 18 (11-12) ◽  
pp. 1573-1577 ◽  
Author(s):  
S. Kai ◽  
K. Hirakawa
Keyword(s):  
Phase Diagram ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Dissipative Structures

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 Effects of droplet size and surfactants on anchoring in liquid crystal nanodroplets

Soft Matter ◽  
2019 ◽  
Vol 15 (19) ◽  
pp. 3914-3922 ◽  
Author(s):  
Zeynep Sumer ◽  
Alberto Striolo
Keyword(s):  
Phase Diagram ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Droplet Size ◽  
Experimental Studies ◽  
Coarse Grained ◽  
Coarse Grained Simulations

In an attempt to bridge the gap between computational and experimental studies, coarse-grained simulations are used to study nematic Liquid Crystal (LC) nanodroplets dispersed in water. A LC phase diagram is generated as a function of droplet size and temperature, and the effect of adding surfactants is quantified.

Impurities in nematic liquid crystal samples inducing changes in the DSM1-DSM2 transition phase diagram

2000 ◽  
Vol 27 (2) ◽  
pp. 277-281 ◽  
Author(s):  
D. E. Lucchetta ◽  
N. Scaramuzza ◽  
G. Strangi ◽  
C. Versace
Keyword(s):  
Phase Diagram ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Transition Phase

Phase Diagram and Photopolymerization Behavior of Mixtures of UV-Curable Multifunctional Monomer and Low Molar Mass Nematic Liquid Crystal

1998 ◽  
Vol 31 (20) ◽  
pp. 6806-6812 ◽  
Author(s):  
Domasius Nwabunma ◽  
Kap Jin Kim ◽  
Yuhui Lin ◽  
L. C. Chien ◽  
Thein Kyu
Keyword(s):  
Phase Diagram ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Molar Mass ◽  
Uv Curable

Effect of Network Elasticity on Nematic Liquid Crystal/Cross-Linked Polymer Phase Diagram

1999 ◽  
Vol 559 ◽  
Author(s):  
D. Nwabunma ◽  
T. Kyu ◽  
R.T. Pogue ◽  
T.J. Bunning
Keyword(s):  
Phase Diagram ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Volume Fraction ◽  
Segment Length ◽  
Polymer Phase ◽  
Cross Links ◽  
Network Functionality ◽  
Experimental Diagram

ABSTRACTThe influence of elasticity on the phase behavior of a mixture of nematic liquid crystal (LC) and in-situ cross-linked polymer has been investigated. Unlike the phase diagram of the LC/pre-cured polymer, the experimental diagram of LC/cross-linked polymer phase supported by theoretical calculation showed no critical point. Instead, the binodal curve exhibits an upward asymptotic behavior as the LC volume fraction approaches unity due to domination arising from network elasticity, particularly at high LC volume fraction. An examination of the effect of cross-links segment length and network functionality on the phase diagram of LC/cross-linked polymer showed that the segment length between cross-links exerts a greater influence.

Magnetic Field-Induced Phase Transitions in Ferrofluid Emulsion

1996 ◽  
Vol 10 (23n24) ◽  
pp. 2973-2981 ◽  
Author(s):  
Yun Zhu ◽  
M.L. Ivey ◽  
P. Sheaffer ◽  
J. Pousset ◽  
Jing Liu
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Phase Diagram ◽  
Phase Transitions ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Volume Fraction ◽  
Emulsion System ◽  
Liquid Crystal Phase ◽  
Critical Fields

Two field-induced phase transition regimes are found in a ferrofluid emulsion system, which are defined by three critical fields, Hc1<HC2<Hc3. The first regime, which starts at Hc1 and finishes at Hc2, is the transition from a gas to induced Nematic liquid crystal phase. In the second regime, or Hc2<H<Hc3, induced Nematic liquid crystal transits to columnar solid structure. A phase diagram is drawn and is explained well by a scaling calculation, which gives Hc1~Φ−1/2, Hc2~Φ−1/4, and Hc3~Φγ exp (πG/Φγ/2), where Φ is the volume fraction, γ=0.172 and G=1.44.

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