Magnetic Field-Induced Phase Transitions in a Thin Film of Cholesteric Liquid Crystal

1981 ◽  
Vol 50 (12) ◽  
pp. 4030-4034
Author(s):  
Motoshi Uchiyama ◽  
Chikara Ishii
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Phase Transitions ◽  
Liquid Crystal ◽  
Cholesteric Liquid Crystal

scholarly journals Synthesis of New Chiral Inducer and Preparation of Semi-Conducting Polymer Films Showing Fingerprint Structure

2014 ◽  
Vol 27 ◽  
pp. 6-12 ◽  
Author(s):  
Hiroki Hayashi ◽  
Kohsuke Kawabata ◽  
Hiromasa Goto
Keyword(s):  
Thin Film ◽  
Liquid Crystal ◽  
Surface Morphology ◽  
Optical Microscopy ◽  
Conducting Polymer ◽  
Electrolyte Solution ◽  
Cholesteric Liquid Crystal ◽  
Chiral Liquid Crystal ◽  
Conducting Polymer Films ◽  
Electrochemical Polymerisation

We synthesised a rod like shaped new chiral inducer to construct chiral liquid crystal electrolyte solution. Next, electrochemical polymerisation was carried out in the chiral liquid crystal electrolyte solution. The surface morphology of the polymers were observed with polarising optical microscopy. Synthesis of the new chiral inducer and preparation of semi-conducting thin film in the cholesteric liquid crystal electrolyte solution were performed.

Magnetic‐Field Effects on a Compensated Cholesteric Liquid Crystal

1969 ◽  
Vol 51 (10) ◽  
pp. 4186-4188 ◽  
Author(s):  
Thomas M. Laronge ◽  
H. Baessler ◽  
M. M. Labes
Keyword(s):  
Magnetic Field ◽  
Liquid Crystal ◽  
Cholesteric Liquid Crystal ◽  
Magnetic Field Effects ◽  
Field Effects

scholarly journals Hybridization and Field Driven Phase Transitions in Hexagonally Warped Topological Insulators

SPIN ◽  
2016 ◽  
Vol 06 (02) ◽  
pp. 1640005 ◽  
Author(s):  
Anirudha Menon ◽  
Debashree Chowdhury ◽  
Banasri Basu
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Phase Transition ◽  
Phase Transitions ◽  
Electric Field ◽  
Surface States ◽  
Material Parameters ◽  
Insulator Phase Transition ◽  
Tilted Magnetic Field

In this paper, we discuss the role of material parameters and external field effects on a thin film topological insulator(TI) in the context of quantum phase transition (QPT). First, we consider an in-plane tilted magnetic field and determine the band structure of the surface states as a function of the tilt angle. We show that the presence of either a hybridization term or hexagonal warping or a combination of both leads to a semi-metal to insulator phase transition which is facilitated by their [Formula: see text] symmetry breaking character. We then note that while the introduction of an electric field does not allow for this QPT since it does not break [Formula: see text] symmetry, it can be used in conjunction with a tunneling element to reach a phase transition efficiently. The corresponding critical point is then nontrivially dependent on the electric field, which is pointed out here. Then, we demonstrate that including a hexagonal warping term leads to an immediate [Formula: see text] symmetry violating QPT.

Bistable polymer-dispersed cholesteric liquid crystal thin film enabled by a stepwise polymerization

RSC Advances ◽  
2015 ◽  
Vol 5 (73) ◽  
pp. 58959-58965 ◽  
Author(s):  
Huihui Wang ◽  
Ling Wang ◽  
Mei Chen ◽  
Tongda Li ◽  
Hui Cao ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Liquid Crystal ◽  
Cholesteric Liquid Crystal ◽  
Polymer Network ◽  
Dielectric Anisotropy ◽  
Polymer Dispersed Liquid Crystal ◽  
Polymer Dispersed ◽  
Photo Curing

By using a proper polymer network and an ion-doped cholesteric liquid crystal with negative dielectric anisotropy, bistable polymer-dispersed liquid crystal thin films were prepared by first photo-curing, and then thermally curing.

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.

Effect of static magnetic field on the helical flow of incompressible cholesteric liquid crystal between two coxial circular cylinders having rotational and axial velocities

1976 ◽  
Vol 19 (3) ◽  
pp. 371-380
Author(s):  
G. Paria ◽  
A. K. Sharma
Keyword(s):  
Magnetic Field ◽  
Liquid Crystal ◽  
Angular Velocity ◽  
Static Magnetic Field ◽  
Axial Velocity ◽  
Cholesteric Liquid Crystal ◽  
Helical Flow ◽  
Circular Cylinders ◽  
The Magnetic Field ◽  
Orientation Of Molecules

AbstractThe paper investigates the effect of a static magnetic field on the helical flow of an incompressible cholestenc liquid crystal with director of unit magnitude between two coaxial circular cylinders rotating with different angular velocities about their common axis and moving with different axial velocities. At low shear rates with a weak magnetic field in the axial direction, the axial velocity, the angular velocity and the orientation of molecules between the two cylinders have been obtained. It is found that the magnetic field has influenced the orientation of molecules while the axial velocity and the angular velocity remain uneffected by the magnetic field.

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