scholarly journals Lyotropic nematic liquid crystals: interplay between a small twist elastic constant and chirality effects under confined geometries

2021 ◽  
Vol 30 (1) ◽  
pp. 2-14
Author(s):  
Clarissa F. Dietrich
Keyword(s):  
Liquid Crystals ◽  
Elastic Constant ◽  
Nematic Liquid Crystals ◽  
Confined Geometries

Behaviour of photosensitive soft materials: Thermo-optical, dielectric and elastic constant studies on azo-dye doped nematic liquid crystals

2011 ◽  
Vol 130 (3) ◽  
pp. 1329-1335 ◽  
Author(s):  
S. Sridevi ◽  
Uma S. Hiremath ◽  
C.V. Yelamaggad ◽  
S. Krishna Prasad ◽  
Y.G. Marinov ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Elastic Constant ◽  
Azo Dye ◽  
Nematic Liquid Crystals ◽  
Soft Materials ◽  
Optical Dielectric

Spontaneously Twisted Nonchiral Nematic Liquid Crystals

1990 ◽  
Vol 45 (6) ◽  
pp. 783-789 ◽  
Author(s):  
A. Chrzanowska
Keyword(s):  
Free Energy ◽  
Liquid Crystals ◽  
Elastic Constant ◽  
Nematic Liquid Crystals ◽  
Model Potential ◽  
Higher Order ◽  
Microscopic Model ◽  
Stability Conditions ◽  
Higher Order Terms ◽  
Potential Stability

AbstractNematic liquid crystals exhibiting a negative K2 elastic constant are discussed on the basis of a microscopic model potential. Stability conditions are satisfied by taking into account higher order terms in the expansion of the free energy. A continuous Freederiks effect is predicted for systems with negative K2.

Orientational director effects in nematic liquid crystals with small Ericksen number

2006 ◽  
Vol 462 (2073) ◽  
pp. 2737-2758 ◽  
Author(s):  
C Atkinson ◽  
P.J.S Pereira
Keyword(s):  
Liquid Crystals ◽  
Differential Equations ◽  
Elastic Constant ◽  
Nematic Liquid Crystals ◽  
Nonlinear Partial Differential Equations ◽  
Infinite Plate ◽  
Director Field ◽  
The Many ◽  
The One ◽  
Strong Anchoring

Orientational director effects in nematic liquid crystals with small Ericksen number are investigated. The director field is disturbed by a semi-infinite plate on y =0 and and moving with a constant velocity U . Strong anchoring conditions at the plate are assumed. The resulting equations are a system of nonlinear partial differential equations for a nematic in the one elastic constant approximation. These equations are reduced to a coupled set of nonlinear ordinary differential equations by a suitable transformation. No such transformation seems possible for the many elastic constant case. The resulting equations are solved using analytical methods and strict bounding solutions obtained. These strict analytical solutions are compared with Picard iterated solutions.

High Precision Method for Determining Twist Elastic Constants of Nematic Liquid Crystals I. Theory

1974 ◽  
Vol 29 (1) ◽  
pp. 125-130 ◽  
Author(s):  
R. Dreher
Keyword(s):  
Magnetic Field ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Elastic Constant ◽  
Nematic Liquid Crystal ◽  
High Precision ◽  
Elastic Constants ◽  
Nematic Liquid Crystals ◽  
Precision Method ◽  
Transmission Measurements

In a magnetic field a nematic liquid crystal may sustain a variety of twist modes. Their influence upon light propagating trough the liquid crystal can be used to evaluate the twist elastic constant from simple reflection or transmission measurements.

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