Influence of shorter backbone and cholesteric monomer percentage on the phase structures and thermal-optical properties of linear siloxane tetramers containing cholesterol and benzene methyl ether groups

RSC Advances ◽  
2016 ◽  
Vol 6 (90) ◽  
pp. 87502-87512 ◽  
Author(s):  
Wenhuan Yao ◽  
Yanzi Gao ◽  
Fasheng Li ◽  
Lanying Zhang ◽  
Zhou Yang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Methyl Ether ◽  
Liquid Crystalline ◽  
Light Reflection ◽  
Crystalline Materials ◽  
Phase Structures ◽  
Liquid Crystalline Materials

A series of thermochromism liquid crystalline materials with an unusual characterization of the centre selective light reflection wavelength (λm) vs. Xchol was prepared.

Design and characterization of novel bis -benzamide liquid crystalline materials

2018 ◽  
Vol 1151 ◽  
pp. 135-141
Author(s):  
Asma Iqbal ◽  
Humaira Masood Siddiqi ◽  
Zareen Akhter ◽  
Muhammad Qaiser Fatmi
Keyword(s):  
Liquid Crystalline ◽  
Crystalline Materials ◽  
Liquid Crystalline Materials

Characterization of sheared liquid crystalline polymers by light microscopy

1993 ◽  
Vol 51 ◽  
pp. 864-865
Author(s):  
Christopher Viney ◽  
Wendy S. Putnam
Keyword(s):  
Liquid Crystalline ◽  
Polymeric Liquid ◽  
Silk Fibers ◽  
Crystalline Materials ◽  
One Dimensional ◽  
Crystalline Polymers ◽  
Periodic Microstructure ◽  
Liquid Crystalline Materials ◽  
Cholesteric Liquid Crystalline

It is widely observed that nematic and cholesteric liquid crystalline materials develop a one-dimensional periodic microstructure during and/or after a uniaxial draw or simple shear (Fig. 1). This property is common to lyotropic and thermotropic examples of both small-molecule and polymeric liquid crystals. The periodic microstructure gives rise to a banded texture between crossed polars (Fig 2).A material under load will extend more readily if the microstructure contains crimps that can be straightened, compared to the extension that is achieved if covalent backbone bonds are highly aligned along the direction of load. The microstructure in Fig. 1 therefore is regarded as a stiffness-reducing defect. Two classes of stiff polymer that are produced from lyotropic solutions do not exhibit banded textures: the highest modulus variant of poly(p-phenyleneterephthalamide) (Kevlar), and various natural silk fibers. However, a banded texture is present in the less stiff variants of Kevlar, and also in silk fibers that have been drawn by hand from natural secretions, which demonstrates that the defect is not intrinsic to liquid crystalline molecular order, but is related to processing.

Optical properties of thiophene-containing liquid crystalline and hybrid liquid crystalline materials

2014 ◽  
Vol 38 (7) ◽  
pp. 2927-2934 ◽  
Author(s):  
Jerzy Romiszewski ◽  
Zita Puterová-Tokarová ◽  
Jozef Mieczkowski ◽  
Ewa Gorecka
Keyword(s):  
Optical Properties ◽  
Hybrid Material ◽  
Liquid Crystalline ◽  
Crystalline Materials ◽  
Liquid Crystalline Materials

Mesogenic and optical properties of thiophene-based stilbenes and azobenzenes were investigated. A new hybrid material built of AuNPs coated with a thiophene-containing ligand is presented.

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