Direct Determination of the Anisotropy of the Magnetic Susceptibility in Smectic Liquid Crystals

1985 ◽  
Vol 40 (1) ◽  
pp. 46-51 ◽  
Author(s):  
G. Illian ◽  
H. Kneppe ◽  
F. Schneider
Keyword(s):  
Magnetic Susceptibility ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Direct Determination ◽  
Oscillation Period ◽  
Smectic Liquid Crystals ◽  
Smectic Liquid Crystal ◽  
Smectic Phases ◽  
Phase Sequence

A sample of an aligned smectic liquid crystal, suspended in a magnetic field, can be excited to oscillations. Measurement of the oscillation period allows a direct determination of the anisotropy of the magnetic susceptibility. Liquid crystals exhibiting the phase sequence isotropicnematic- smectic A can be aligned very well and precise y.A values can be determined. A direct transformation from the isotropic to the smectic phase or phase transitions between smectic phases can cause an incomplete alignment of the liquid crystal and worse results.

Examination of molecular packing in orthogonal smectic liquid crystal phases: a guide for molecular design of functional smectic phases

2017 ◽  
Vol 19 (37) ◽  
pp. 25518-25526 ◽  
Author(s):  
Yasuhisa Yamamura ◽  
Takahito Murakoshi ◽  
Mafumi Hishida ◽  
Kazuya Saito
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Chain Length ◽  
Molecular Design ◽  
Molecular Packing ◽  
Smectic Liquid Crystals ◽  
Alkyl Chains ◽  
Smectic Liquid Crystal ◽  
Smectic Phases ◽  
Crystal Phases

Two modes of packing of molten alkyl chains in smectic liquid crystals are revealed through analyzing the chain-length dependence of layer spacings.

Shear flow simulations of smectic liquid crystals based on the Gay–Berne fluid and the soft sphere string-fluid

2019 ◽  
Vol 21 (1) ◽  
pp. 292-305 ◽  
Author(s):  
Sten Sarman ◽  
Yong-Lei Wang ◽  
Aatto Laaksonen
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Shear Flow ◽  
Smectic Liquid Crystals ◽  
Soft Sphere ◽  
Flow Simulations ◽  
Smectic Liquid Crystal

Smectic liquid crystal undergoing shear flow.

Creation of a superhydrophobic surface from a sublimed smectic liquid crystal

RSC Advances ◽  
2014 ◽  
Vol 4 (51) ◽  
pp. 26946-26950 ◽  
Author(s):  
Dae Seok Kim ◽  
Yun Jeong Cha ◽  
Hanim Kim ◽  
Mun Ho Kim ◽  
Yun Ho Kim ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Superhydrophobic Surface ◽  
Smectic Liquid Crystals ◽  
Smectic Liquid Crystal ◽  
Scale Structures ◽  
Dual Scale

Dual-scale structures showing superhydrophobic characteristics have been fabricated using sublimable smectic liquid crystals.

Alignment Of Smectic Liquid Crystal Molecules By Grated Glass And Silicon Substrates

1994 ◽  
Vol 345 ◽  
Author(s):  
L. J. Martínez-Miranda ◽  
E. Smela ◽  
H. Liu
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Silicon Wafers ◽  
Temperature Cycling ◽  
Silicon Substrates ◽  
Smectic Liquid Crystals ◽  
Smectic Liquid Crystal

AbstractWe present the results of a study of the effect of photolithographed gratings on glass and silicon wafers on the alignment of smectic liquid crystal molecules. The gratings have periods in the range of 200nm − 200µm, and depths of up to 2µm. We found that smectic liquid crystals align sharply along the gratings, depending on the temperature cycling method used in loading the sample. This result applies both to silicon gratings as well as glass gratings, despite the increased roughness observed in glass gratings. The quality of the alignment is uniform in the range 664nm − 24µm, and breaks down outside this region, setting lower and upper boundaries for grating preparation.

Zustandsdiagramme und röntgenographische Untersuchungen einiger induzierter smektischer Mischphasen / Phase Diagrams and X -R ay Studies of the Induced Smectic Phases of Liquid Crystal Mixtures

1978 ◽  
Vol 33 (9) ◽  
pp. 1077-1084 ◽  
Author(s):  
B. Engelen ◽  
F. Schneider
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Phase Diagrams ◽  
Layer Thickness ◽  
Polar Liquid ◽  
X Ray ◽  
Polar Components ◽  
Smectic Phases ◽  
Induced Smectic Phases

Phase diagrams of mixtures of terminal polar and terminal non-polar liquid crystals that exhibit smectic phases with very large ranges of stability are presented. X-ray studies show that the in­duced phases are of type SA, SB or SE. The determination of the layer thickness shows that the induced smectic phases are composed of monolayers, whereas the terminal polar components are composed of bilayers. A model for the formation of the induced smectic phases is proposed.

INFLUENCE OF DIMENSIONALITY AND SURFACE ORDERING ON PHASE TRANSITIONS: STUDIES OF FREELY-SUSPENDED LIQUID-CRYSTAL FILMS

1994 ◽  
Vol 08 (22) ◽  
pp. 3051-3082 ◽  
Author(s):  
CHRISTIAN BAHR
Keyword(s):  
Phase Transitions ◽  
Liquid Crystal ◽  
Two Dimensions ◽  
Smectic Liquid Crystals ◽  
Liquid Crystal Films ◽  
Integral Number ◽  
Smectic Phases ◽  
Crystal Films ◽  
Freely Suspended ◽  
Freely Suspended Films

Freely-suspended films of smectic liquid crystals can be regarded as membranes consisting of a stack of an integral number of molecular (smectic) layers with the layer planes being parallel to the two free surfaces. Because of their variable thickness (between thousands and only two layers) and the large variety of phase transitions between different smectic phases, freely-suspended films are excellent systems to study the influence of the dimensional cross-over from three to two dimensions on phase transitions. Further, because the free surface of a liquid crystal has a strong ordering effect (contrary to solids which exhibit generally surface-induced disorder), freely-suspended films are well-suited for the study of the effect of enhanced surface order on phase transitions. A review of the corresponding experimental work is given.

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