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.

Structure and molecular packing in smectic BCr and Ad phases of Schiff base liquid crystal compounds through the analyses of layer spacing, entropy and crystal structure

2017 ◽  
Vol 19 (29) ◽  
pp. 19434-19441 ◽  
Author(s):  
Yasuhisa Yamamura ◽  
Takahito Murakoshi ◽  
Sakiko Iwagaki ◽  
Natalia Osiecka ◽  
Hideki Saitoh ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Chain Length ◽  
Molecular Packing ◽  
Smectic Liquid Crystals ◽  
Layer Spacing ◽  
Alkyl Chains ◽  
Base Liquid

Chain-length dependence of layer spacing reveals the packing of molten alkyl chains in smectic liquid crystals.

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.

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.

scholarly journals Liquid crystal phase transitions in suspensions of mineral colloids: new life from old roots

2013 ◽  
Vol 371 (1988) ◽  
pp. 20120263 ◽  
Author(s):  
H. N. W. Lekkerkerker ◽  
G. J. Vroege
Keyword(s):  
Phase Transitions ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Colloidal Suspensions ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Future Developments ◽  
Mineral Particles ◽  
Crystal Phases ◽  
Liquid Crystal Phases

A review is given of the field of mineral colloidal liquid crystals : liquid crystal phases formed by individual mineral particles within colloidal suspensions. Starting from their discovery in the 1920s, we discuss developments on the levels of both fundamentals and applications. We conclude by highlighting some promising results from recent years, which may point the way towards future developments.

Discotic Liquid Crystals of Transition metal Complexes 23: Synthesis and Mesomorphism of Tetrakis(3,4-di-n-alkylphenyl)porphyrin Derivatives and Their Metal Complexes

1999 ◽  
Vol 03 (04) ◽  
pp. 249-258 ◽  
Author(s):  
KAZUCHIKA OHTA ◽  
MASAHIRO ANDO ◽  
IWAO YAMAMOTO
Keyword(s):  
Liquid Crystal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Room Temperature ◽  
Discotic Liquid Crystals ◽  
X Ray ◽  
Alkyl Chains ◽  
Porphyrin Derivatives ◽  
Crystal Phases ◽  
Long Chain

Five novel long-chain-substituted porphyrin derivatives, tetrakis(3,4-dialkylphenyl)porphyrins (abbreviated as (Cn)8 TPPH 2 (n = 8, 12, 18), ( C 18)8 TPPCu and ( C 18)8 TPPNi ), were synthesized and their mesomorphism was investigated. It was found that the (Cn)8 TPPH 2 (n = 8, 12), derivatives are isotropic liquids at room temperature and that each of the ( C 18)8 TPPM ( M ≡ H 2, Cu , Ni ) derivatives has two liquid crystal phases M1 and M2 and two unidentified phases X1 and X2. It was revealed by X-ray studies that the M2 phase is a discotic lamellar (DL) phase. Interestingly, these porphyrin derivatives exhibit not a columnar but a lamellar mesophase, even though they have a disk-like central core with eight alkyl chains in the surroundings.

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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