Supramolecular chiral liquid crystals. The liquid crystalline behaviour of mixtures of 4,4′-bipyridyl and 4-[(S)-(−)-2-methylbutoxy]benzoic acid

1997 ◽  
Vol 7 (2) ◽  
pp. 211-214 ◽  
Author(s):  
Maren Grunert ◽  
R. Alan Howie ◽  
Annett Kaeding ◽  
Corrie T. Imrie
Keyword(s):  
Liquid Crystals ◽  
Benzoic Acid ◽  
Liquid Crystalline ◽  
Chiral Liquid Crystals

scholarly journals Mesoscale structure of wrinkle patterns and defect-proliferated liquid crystalline phases

2020 ◽  
Vol 117 (8) ◽  
pp. 3938-3943 ◽  
Author(s):  
Oleh Tovkach ◽  
Junbo Chen ◽  
Monica M. Ripp ◽  
Teng Zhang ◽  
Joseph D. Paulsen ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Primary Source ◽  
Fixed Number ◽  
Coarse Grained ◽  
Buffer Zones ◽  
Ginzburg Landau ◽  
Mesoscale Structure ◽  
Liquid Crystalline Phases ◽  
Chiral Liquid Crystals

Thin solids often develop elastic instabilities and subsequently complex, multiscale deformation patterns. Revealing the organizing principles of this spatial complexity has ramifications for our understanding of morphogenetic processes in plant leaves and animal epithelia and perhaps even the formation of human fingerprints. We elucidate a primary source of this morphological complexity—an incompatibility between an elastically favored “microstructure” of uniformly spaced wrinkles and a “macrostructure” imparted through the wrinkle director and dictated by confinement forces. Our theory is borne out of experiments and simulations of floating sheets subjected to radial stretching. By analyzing patterns of grossly radial wrinkles we find two sharply distinct morphologies: defect-free patterns with a fixed number of wrinkles and nonuniform spacing and patterns of uniformly spaced wrinkles separated by defect-rich buffer zones. We show how these morphological types reflect distinct minima of a Ginzburg–Landau functional—a coarse-grained version of the elastic energy, which penalizes nonuniform wrinkle spacing and amplitude, as well as deviations of the actual director from the axis imposed by confinement. Our results extend the effective description of wrinkle patterns as liquid crystals [H. Aharoni et al., Nat. Commun. 8, 15809 (2017)], and we highlight a fascinating analogy between the geometry–energy interplay that underlies the proliferation of defects in the mechanical equilibrium of confined sheets and in thermodynamic phases of superconductors and chiral liquid crystals.

Structural studies on different types of ferroelectric liquid crystalline substances

2011 ◽  
Vol 35 (1) ◽  
pp. 3-13 ◽  
Author(s):  
D. Obadović ◽  
M. Stojanović ◽  
A. Bubnov ◽  
N. Éber ◽  
M. Cvetinov ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Molecular Conformation ◽  
Large Angle ◽  
Structural Studies ◽  
Layer Spacing ◽  
Different Types ◽  
Intermolecular Distances ◽  
Chiral Liquid Crystals

Structural studies on different types of ferroelectric liquid crystalline substances Structural studies of ferroelectric liquid crystalline substances of different molecular structure have been reviewed. The discussion of the results deals mainly with the structure of chiral liquid crystals forming the smectic mesophase with ferroelectric order, as the research on ferroelectric liquid crystals, due to their high potential for application in electro-optics and photonics, has recently become one of the most attractive fields. Based on data of polarizing optical microscopy and X-ray diffraction obtained for unoriented samples we have identified the type of the mesophases, the temperature of the phase transitions and outlined the phase diagrams. An analysis of the relation between the molecular conformation and different types of phase transitions has been performed. The layer spacing and the average intermolecular distances have been determined for all studied phases from the positions of the small and the large angle diffraction peaks, respectively.

OPTICAL DIFFRACTION IN CHIRAL LIQUID CRYSTALS

1996 ◽  
Vol 10 (08) ◽  
pp. 305-321 ◽  
Author(s):  
K.A. SURESH ◽  
YUVARAJ SAH
Keyword(s):  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Optical Diffraction ◽  
Phase Grating ◽  
Recent Advances ◽  
Chiral Liquid Crystals

Optical diffraction in the phase grating mode of twisted liquid crystalline media has been considered. In particular, the recent advances in this area have been emphasised.

THE OPTICAL PROPERTIES OF CHIRAL LIQUID CRYSTALS

1995 ◽  
Vol 09 (18n19) ◽  
pp. 2363-2387 ◽  
Author(s):  
K.A. SURESH
Keyword(s):  
Optical Properties ◽  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Optical Diffraction ◽  
Chiral Liquid Crystals

In recent times, optical diffraction and reflection from periodically twisted liquid crystalline media have attracted a lot of attention. The important developments in this area have been considered here.

A 2*2 fiber optic switch using chiral liquid crystals

1990 ◽  
Vol 2 (2) ◽  
pp. 147-149 ◽  
Author(s):  
N.K. Shankar ◽  
J.A. Morris ◽  
C.P. Yakymyshyn ◽  
C.R. Pollock
Keyword(s):  
Liquid Crystals ◽  
Fiber Optic ◽  
Chiral Liquid Crystals

Liquid-crystalline behaviour and electrorheological effect of phthalocyanine-based ionic liquid crystals

2020 ◽  
pp. 1-10
Author(s):  
Aikebaier Reheman ◽  
Shuangying Hu ◽  
Lianjun Cao ◽  
Danhua Xie ◽  
Guiyang Yan ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Electrorheological Effect ◽  
Ionic Liquid Crystals

OPTICAL ACTIVITY AND LIGHT SCATTERING IN HIGHLY CHIRAL LIQUID CRYSTALS

1992 ◽  
Vol 06 (08) ◽  
pp. 425-446 ◽  
Author(s):  
PETER J. COLLINGS
Keyword(s):  
Liquid Crystals ◽  
Light Scattering ◽  
Optical Activity ◽  
Smectic A ◽  
Scattering Effects ◽  
Smectic A Phase ◽  
Blue Phases ◽  
Chiral Liquid Crystals

Theoretical and experimental optical activity and light scattering work in highly chiral liquid crystals is reviewed, starting from the early studies twenty years ago and ending with the most current investigations. Pretransitional effects in the isotropic and smectic A phases of highly chiral liquid crystals are discussed, as well as optical activity and light scattering effects in both the blue phases and smectic A * phase.

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