Prediction of the transitional properties of liquid crystal dimers. A molecular field calculation based on the surface tensor parametrization

1994 ◽  
Vol 100 (2) ◽  
pp. 1460-1469 ◽  
Author(s):  
A. Ferrarini ◽  
G. R. Luckhurst ◽  
P. L. Nordio ◽  
S. J. Roskilly
Keyword(s):  
Liquid Crystal ◽  
Molecular Field ◽  
Field Calculation ◽  
Surface Tensor

scholarly journals Molecular Field Calculation of Magnetization on Single Crystal

2008 ◽  
Vol 2008 ◽  
pp. 1-4
Author(s):  
A. Himori ◽  
K. Hattori ◽  
T. Shigeoka
Keyword(s):  
Single Crystal ◽  
Field Model ◽  
Magnetic Phase Diagram ◽  
Magnetic Behavior ◽  
Molecular Field ◽  
Ferromagnetic Phase ◽  
Field Calculation ◽  
Magnetic Structures ◽  
Magnetization Processes ◽  
Crystal Compound

Calculation of magnetization of the ternary single crystal compound has been carried out by using the wave-like molecular field model to explain the complex magnetic behavior. The field-induced magnetic structures having the propagation vectors, , , , and (= the field-induced ferromagnetic phase) were proposed. Calculation on the basis of these structures and the antiferromagnetic phase with well reproduces the experimental magnetization processes and - magnetic phase diagram.

scholarly journals Molecular field theory for biaxial nematics formed from liquid crystal dimers and inhibited by the twist-bend nematic

2017 ◽  
Vol 19 (43) ◽  
pp. 29321-29332 ◽  
Author(s):  
T. B. T. To ◽  
T. J. Sluckin ◽  
G. R. Luckhurst
Keyword(s):  
Field Theory ◽  
Liquid Crystal ◽  
Molecular Field ◽  
Molecular Field Theory ◽  
Biaxial Nematics ◽  
Nematic Phases ◽  
Biaxial Nematic

Theory shows the ability of flexible dimers to adopt bent and linear shapes facilitates the formation of biaxial nematic phases.

Freeze-fracture TEM of the helical smectic A* phase

1992 ◽  
Vol 50 (1) ◽  
pp. 278-279
Author(s):  
K.J. Ihn ◽  
R. Pindak ◽  
J. A. N. Zasadzinski
Keyword(s):  
Liquid Crystal ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Freeze Fracture ◽  
Smectic Phase ◽  
Layer Spacing ◽  
Screw Dislocations ◽  
Smectic A ◽  
Smectic Phases ◽  
Discrete Amount

A new liquid crystal (called the smectic-A* phase) that combines cholesteric twist and smectic layering was a surprise as smectic phases preclude twist distortions. However, the twist grain boundary (TGB) model of Renn and Lubensky predicted a defect-mediated smectic phase that incorporates cholesteric twist by a lattice of screw dislocations. The TGB model for the liquid crystal analog of the Abrikosov phase of superconductors consists of regularly spaced grain boundaries of screw dislocations, parallel to each other within the grain boundary, but rotated by a fixed angle with respect to adjacent grain boundaries. The dislocations divide the layers into blocks which rotate by a discrete amount, Δθ, given by the ratio of the layer spacing, d, to the distance between grain boundaries, lb; Δθ ≈ d/lb (Fig. 1).

Attractive mode force microscopy of chiral liquid crystal surfaces

1992 ◽  
Vol 50 (1) ◽  
pp. 268-269
Author(s):  
B.D. Terris ◽  
R. J. Twieg ◽  
C. Nguyen ◽  
G. Sigaud ◽  
H. T. Nguyen
Keyword(s):  
Liquid Crystal ◽  
Crystal Surfaces ◽  
Free Surfaces ◽  
Control Range ◽  
Force Microscopy ◽  
Liquid Crystal Films ◽  
Chiral Liquid Crystal ◽  
Crystal Films ◽  
Electrostatic Charging ◽  
And Shifts

We have used a force microscope in the attractive, or noncontact, mode to image a variety of surfaces. In this mode, the microscope tip is oscillated near its resonant frequency and shifts in this frequency due to changes in the surface-tip force gradient are detected. We have used this technique in a variety of applications to polymers, including electrostatic charging, phase separation of ionomer surfaces, and crazing of glassy films.Most recently, we have applied the force microscope to imaging the free surfaces of chiral liquid crystal films. The compounds used (Table 1) have been chosen for their polymorphic variety of fluid mesophases, all of which exist within the temperature control range of our force microscope.

Development of liquid crystal light valves using Bi12SiO20 as the photoconductor. Part 2: Device performance

1986 ◽  
Vol 133 (1) ◽  
pp. 65
Author(s):  
W.L. Baillie ◽  
P.M. Openshaw ◽  
A.D. Hart ◽  
S.S. Makh
Keyword(s):  
Liquid Crystal ◽  
Device Performance
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