Temperature and external field-driven microrelief at free surface of smectic-A liquid crystal

2008 ◽  
Vol 372 (21) ◽  
pp. 3904-3908
Author(s):  
Leonid V. Mirantsev
Keyword(s):  
Free Surface ◽  
Liquid Crystal ◽  
External Field ◽  
Smectic A

scholarly journals Nanoprofilometry study of focal conic domain structures in a liquid crystalline free surface

2017 ◽  
Vol 8 ◽  
pp. 2544-2551
Author(s):  
Anna N Bagdinova ◽  
Evgeny I Demikhov ◽  
Nataliya G Borisenko ◽  
Sergei M Tolokonnikov
Keyword(s):  
Free Surface ◽  
Liquid Crystal ◽  
High Resolution ◽  
Liquid Crystalline ◽  
Surface Profile ◽  
Free Boundaries ◽  
High Quality ◽  
Smectic A ◽  
Conic Domain ◽  
Domain Structures

This work presents the first high-resolution nanoprofilometry study consisting of nanoscale resolution surface profile measurements and high-quality visualization of a the free surface of a liquid crystal–air boundary. The capabilities of this new experimental method, as applied for liquid crystal free boundaries, are discussed. The formation of focal conic domain structures at the smectic-A–air free boundary was detected and studied.

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).

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