By Sandeep Kumar
The self-contained houses of discotic liquid crystals (DLCs) render them strong useful fabrics for plenty of semiconducting machine purposes and types for strength and cost migration in self-organized dynamic sensible smooth fabrics. The earlier 3 many years have noticeable large curiosity during this sector, fueled essentially through the opportunity of making a new new release of natural semiconductors and vast viewing monitors utilizing DLCs. whereas a couple of books on classical calamitic liquid crystals can be found, there are, as but, no books which are devoted completely to the elemental layout rules, synthesis, and actual homes of DLCs. the 1st reference publication to hide DLCs, Chemistry of Discotic Liquid Crystals: From Monomers to Polymers highlights the chemistry and thermal habit of DLCs. Divided into six chapters, each one with a basic description, heritage, and context for the ideas concerned, the e-book starts off with a easy advent to liquid crystals, describing molecular self-assembly and diverse different types of liquid crystals. It outlines their class, covers their heritage and normal purposes, and specializes in DLCs and their discovery, constitution, characterization, and alignment. The booklet is going directly to study the chemistry and actual houses of assorted monomeric DLCs, together with 25 sections describing the synthesis and mesomorphic homes of monomeric DLCs shaped by way of various cores. the majority of the e-book covers the chemistry and mesomorphism of discotic dimers, oligomers, and polymers and concludes with a glance at a few appropriate houses of DLCs. A finished and up to date source, this publication is designed to be obtainable and of worth not only for college kids and researchers but additionally to the administrators and critical investigators operating during this box, supplying the basis and gas to strengthen this fast-growing technological box.
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Extra resources for Chemistry of Discotic Liquid Crystals: From Monomers to Polymers (Liquid Crystals Book Series)
There have been extensive reports on the orientational control of calamitic LCs by mechanical rubbing and external field effects as well as photo-alignment techniques, leading to their versatile applications such as in display devices. In contrast, the alignment technology for DLCs was not well developed in general, in particular the alignment of discotic nematic LCs. The alignment of discotic nematic (N D) is hindered by the rare and high-temperature occurrence of the nematic phase and very few compounds are known to exhibit stable room temperature discotic nematic phase .
Note that the axial and lateral displacements of the molecules are not present in this phase. 31 X-ray diffraction pattern and I–2θ profile of the columnar plastic phase. K. , Mol. Cryst. Liq. , 396, 121, 2003. 32 Structures of columnar helical phases: (a) helical phase with crystalline order and threecolumn superlattice and (b) helical phase with liquid crystalline order (this phase is a columnar hexagonal phase with intracolumnar helical order of the discotic molecules). 33 and clearly indicates the 3D positional order of the H phase .
Presumably, the perceived lack of application for discotics is one of the reasons why the 30 Chemistry of Discotic Liquid Crystals: From Monomers to Polymers alignment control technology of discotics was lagging behind the calamitic LCs. DLCs can align spontaneously but the alignment is neither uniform nor monodomain in nature. From a practical applications point of view, it is highly desirable to have uniform uniaxial alignment of the columnar phases. Recently, owing to their application potential in organic semiconducting devices and display devices, diverse alignment control techniques for both columnar and nematic phases have been developed and now almost any kind of alignment can be achieved for discotic materials [184–188].