A pressure‐ and temperature‐controlled sample cell for the structural investigation of lyotropic liquid crystals using a small‐angle x‐ray diffraction line source

1996 ◽  
Vol 67 (12) ◽  
pp. 4228-4234 ◽  
Author(s):  
P. M. Duesing ◽  
R. H. Templer ◽  
J. M. Seddon
Keyword(s):  
Liquid Crystals ◽  
Small Angle ◽  
Line Source ◽  
Structural Investigation ◽  
Lyotropic Liquid Crystals ◽  
Diffraction Line ◽  
X Ray Diffraction ◽  
Sample Cell ◽  
X Ray ◽  
Temperature Controlled

Unexpected lyotropic liquid crystals from ion-induced columnar assembly of Schiff-base macrocycles

2012 ◽  
Vol 90 (12) ◽  
pp. 1056-1062 ◽  
Author(s):  
Joseph K.-H. Hui ◽  
Jian Jiang ◽  
Mark J. MacLachlan
Keyword(s):  
Electron Microscopy ◽  
Schiff Base ◽  
Liquid Crystals ◽  
Lyotropic Liquid Crystals ◽  
Metal Salts ◽  
Alkali Metal Salts ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Schiff Base Macrocycles

Schiff-base macrocycles 1, which have a crown ether-like interior, form ionic nematic lyotropic liquid crystals in various organic solvents when functionalized with long alkoxy substituents and complexed to diverse ammonium and alkali metal salts. From X-ray diffraction and transmission electron microscopy studies, and by comparison with the organization of macrocycles functionalized with shorter chains, these macrocycles assemble into lyotropic liquid crystals where the macrocycles are stacked and the cation is included in their interiors.

Four-stranded aggregates of oligodeoxyguanylates forming lyotropic liquid crystals: a study by circular dichroism, optical microscopy, and x-ray diffraction

1991 ◽  
Vol 113 (15) ◽  
pp. 5809-5816 ◽  
Author(s):  
Stefania Bonazzi ◽  
Massimo Capobianco ◽  
Monica Mirande De Morais ◽  
Anna Garbesi ◽  
Giovanni Gottarelli ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Liquid Crystals ◽  
Optical Microscopy ◽  
Lyotropic Liquid Crystals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Circular Dichroïsm

Discotic liquid crystals of transition metal complexes 56: Synthesis of mesogenic phthalocyanine-fullerene dyads and influence of the substitution position of alkoxy chains and the kind of terminal groups on appearance of the helical supramolecular structure

2018 ◽  
Vol 22 (08) ◽  
pp. 693-715 ◽  
Author(s):  
Kohei Ishikawa ◽  
Ayumi Watarai ◽  
Mikio Yasutake ◽  
Kazuchika Ohta
Keyword(s):  
Liquid Crystals ◽  
Small Angle ◽  
Supramolecular Structure ◽  
Alkoxy Group ◽  
X Ray Diffraction ◽  
Preparation Methods ◽  
X Ray ◽  
Phenoxy Group ◽  
Temperature Variable ◽  
Diffraction Patterns

We have synthesized twelve novel discotic columnar liquid crystals based on a phenoxy-group-substituted phthalocyaninato copper(II) complex having the same alkoxy chain of C[Formula: see text]H[Formula: see text]O at different positions in the phenoxy group: the parent compounds {0a~0c-16}and the OH-substituted compounds {3a~3c-16}, the OFBA-substituted compounds {2a~2c-16}and the C[Formula: see text]-substituted dyads {1a~1c-16}. The letters of a, b and c mean substitution positions of C[Formula: see text]H[Formula: see text]O group at [Formula: see text], [Formula: see text] and [Formula: see text], respectively. We have investigated the influence of both substitution position of the alkoxy chains and the kind of terminal groups (OH, OFBA and C[Formula: see text] on the mesomorphism and the helical supramolecular structure, by using DSC, POM and temperature-variable small angle X-ray diffraction measurements. As a result, an additional big peak (Peak H) tends to appear at around 2[Formula: see text] = 1.1[Formula: see text] in the X-ray diffraction patterns only for the dyads {1a~1c-16}but not for the other compounds, {0a~0c-16}, {3a~3c-16}and {2a~2c-16}, regardless of the substitution positions of the alkoxy group. Moreover, we revealed that both the m-substituted derivative 1a-16 and the m,p-substituted derivative 1c-16 gave Peak H, but that only the p-substituted derivative 1b-16 did not give Peak H among these three dyads {1a~1c-16}. From the temperature-variable small angle X-ray diffraction measurements for the m,p-substituted derivative 1c-16 using two different sample preparation methods, we proved that the Peak H originates from a helical pitch of fullerenes. We also pointed out that the m-substituted long alkoxy chains are at least needed to form the helical supramolecular structure in the present (PhO)[Formula: see text]PcM-C[Formula: see text]-based dyads.

Small-angle X-ray diffraction investigation of twinned opal-like structures

2012 ◽  
Vol 54 (10) ◽  
pp. 2073-2082 ◽  
Author(s):  
A. K. Samusev ◽  
I. S. Sinev ◽  
K. B. Samusev ◽  
M. V. Rybin ◽  
A. A. Mistonov ◽  
...  
Keyword(s):  
Small Angle ◽  
X Ray Diffraction ◽  
X Ray

Time-resolved isothermal crystallization of absorbable PGA-co-PLA copolymer by synchrotron small-angle X-ray scattering and wide-angle X-ray diffraction

Polymer ◽  
2001 ◽  
Vol 42 (21) ◽  
pp. 8965-8973 ◽  
Author(s):  
Zhi-Gang Wang ◽  
Xuehui Wang ◽  
Benjamin S. Hsiao ◽  
Saša Andjelić ◽  
Dennis Jamiolkowski ◽  
...  
Keyword(s):  
Small Angle ◽  
Isothermal Crystallization ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering
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