By Sandeep Kumar
The self-contained homes of discotic liquid crystals (DLCs) render them robust useful fabrics for plenty of semiconducting machine purposes and types for strength and cost migration in self-organized dynamic sensible delicate fabrics. The prior 3 a long time have visible large curiosity during this zone, fueled basically by way of the potential for making a new iteration of natural semiconductors and large viewing screens utilizing DLCs. whereas a couple of books on classical calamitic liquid crystals can be found, there are, as but, no books which are committed completely to the elemental layout rules, synthesis, and actual homes of DLCs. the 1st reference booklet 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, historical past, and context for the recommendations concerned, the booklet starts off with a easy creation to liquid crystals, describing molecular self-assembly and diverse forms of liquid crystals. It outlines their category, covers their historical past and normal functions, and makes a speciality of DLCs and their discovery, constitution, characterization, and alignment. The ebook is going directly to study the chemistry and actual homes of assorted monomeric DLCs, together with 25 sections describing the synthesis and mesomorphic houses of monomeric DLCs shaped by way of various cores. the majority of the publication covers the chemistry and mesomorphism of discotic dimers, oligomers, and polymers and concludes with a glance at a few appropriate homes of DLCs. A finished and updated source, this ebook is designed to be available and of price not only for college students and researchers but additionally to the administrators and imperative investigators operating during this box, delivering the root and gas to boost this fast-growing technological box.
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Extra info for Chemistry of Discotic Liquid Crystals: From Monomers to Polymers (Liquid Crystals Book Series)
Phase structures are not sufficiently well characterized at present. Moreover, some of the B phases appear to be soft crystals. The structures proposed for some of the mesophases are characterized by columnar order and others by lamellar order. In addition to the fascinating B phases, bent-core LCs also form conventional nematic and smectic phases. Bent-core mesogens are the first thermotropic LCs for which a biaxial nematic (Nb) phase has been unambiguously determined [116–119]. These compounds also exhibit biaxial and polar smectic A phases.
Recently, Ichimura et al. 37). Polymethacrylate films containing photoactive p-cyanoazobenzene groups have been used for the orientational control of DLCs. Conoscopic observations revealed that a film of polymer irradiated with linearly polarized light from surface normal induces solely homeotropic alignment with an orientational director of DLCs perpendicular to the surface plane. Oblique irradiation of the polymer film by nonpolarized light induces tilted alignment of the discotic molecules in the nematic phase or hybrid alignment containing a distribution of the DLC director.
36 Structure mesomorphism of DLCs. Accordingly, a variety of DLCs were prepared, of the cubic phase exhiband the relationship between the molecular structure and mesophase ited by DLCs. properties was revealed to some extent. , in 1994, demonstrated that the columnar phases possess very high charge carrier mobility along the column axes . It was realized that the supramolecular order of the columnar phases of the DLCs has the potential to act as active functional materials in organic electronic and optoelectronic devices.
Chemistry of Discotic Liquid Crystals: From Monomers to Polymers (Liquid Crystals Book Series) by Sandeep Kumar
Categories: Solid State Physics