Download or read book The Synthesis and Liquid Crystal Properties of Cyclobutanes and Laterally Fluorinated Terphenyls written by L. K. M. Chan and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Synthesis and Liquid Crystal Properties of Laterally Fluoro substituted Biphenyls written by Anderson Ifill (D.) and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Mesogenic Properties of Liquid Crystals with Bent Core tail Substitution Geometry written by David Davis and published by . This book was released on 2013 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design of liquid crystalline materials has traditionally focused on the synthesis of long, rod-like (collinear) structures, as per the model established by McMillan and coworkers. However, while deviation from this model in the form of bent-core (noncollinear) materials has recently been explored, very little attention has been given to design of materials with bent core-tail substitution geometry. In this study, materials have been synthesized that incorporate a bend in the molecule through substitution of tails on a linear core, and their mesogenic properties have been studied. The classes of materials synthesized include p-terphenyls and p-quaterphenyls with tails substituted in the 3-; 4-; 3,3"-; 3,4"-; and 4,4"- positions. In addition, a number of 1,3,4-oxadiazole terminated phenyl- and biphenyl-core materials have been synthesized with various alkoxy tails at the 4- position of the phenyl terminus and alkyl tails in the 5- position of the oxadiazole terminus. The terphenyl and quaterphenyl materials were synthesized through Suzuki coupling methods, while the oxadiazole materials were synthesized through condensation of a hydrazide and an orthoester, or through the Huisgen rearrangement of a tetrazole in the presence of a carboxylic acid and DCC. While various smectic phases were observed in the collinear terphenyl materials that were synthesized, no liquid crystalline phases were observed in the noncollinear terphenyls, with the exception of a single monotropic smectic B phase. However, a smectic A phase was observed in 4-hexyloxy-3"'-methoxy-p-quaterphenyl. Various smectic phases and a nematic phase were observed in the 2-(4-alkoxybiphenyl)-5-alkyl-1,3,4-oxadiazoles synthesized, but no mesogenic phases were observed in the synthesized 2-(4-alkoxyphenyl)-5-alkyl-1,3,4-oxadiazoles. The nematic phase found upon heating of 2-(4-hexyloxybiphenyl)-1,3,4-oxadiazole to 154.6° C is of especial note due to the utility of this phase in device applications, but the presence of smectic B phases in compounds with methyl tails at the oxadiazole terminus and smectic A phases in compounds with longer tails at the oxadiazole terminus were also noteworthy.
Download or read book Synthesis Liquid Crystal Property and Gelation Ability of Semi fluorinated 4 alkoxyphenyl 4 alkoxybenzoates written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1989-09 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Synthesis and Properties of Achiral and Chiral Bent core Liquid Crystals written by Kenneth Matthew Fergusson and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The area of liquid crystals has received substantial research effort over the last century, particularly when the beneficial applications such as Liquid Crystal Displays (LCDs) were realised and developed. For the majority of this time, it has been considered that a linear molecular shape is required in order to generate a mesomorphic phase. It was therefore of particular interest and excitement when, in 1996, it was shown that a 'banana-shaped' molecular architecture could exhibit a new class of liquid crystalline phase. Additionally it was found that these new mesophases exhibited chiral domains, leading to electrooptical switching properties, despite the constituent molecules being achiral. Unsurprisingly, these observations have led to a vast frontier of research in the area of 'banana-shaped' and 'bentcore' systems over the past decade and many interesting properties relating to such systems have been reported. The work contained within this thesis investigates two areas of bent-core liquid crystals. Firstly, the introduction of fluoro-substituents to the bent-core of an achiral banana-shaped system has been assessed, in terms of both position, and number of substituents. The resultant mesomorphic properties of these compounds have shown that there is a very delicate boundary between banana, and 'conventional' mesomorphism, relating to subtle changes in molecular structure. Appropriately positioned fluoro-substituents upon the bent-core generate a more linear conformation, facilitating the generation of nematic phases. Possible reasoning for this observation has been discussed. Secondly, the effect of introducing a bent-core to a conventional calamitic structure, and the addition of fluoro-substituents, has been examined. Whilst a variation of this nature to the majority of calamitic molecular structures would have a severely detrimental effect upon the resultant mesophase morphology, it has been shown that this is not always the case and indeed the addition of fluoro-substituents is shown to enhance the mesomorphic stability of the smectic A phase.
Download or read book Das seinem Gott singende Annaberg Oder written by and published by . This book was released on 1763 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 1988 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluorinated Ferroelectric Liquid Crystals written by Christa Loubser and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Asymmetric Fluorinated Dimers for Dual Frequency Liquid Crystal Mixtures written by David Allan and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Synthesis Properties of Chiral Binaphthalenes as Nematic Liquid Crystal Dopants written by Chris Schubert and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modern Problems of the Physics of Liquid Systems written by Leonid A. Bulavin and published by Springer Nature. This book was released on 2019-09-03 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a collection of selected reviews from PLMMP 2018 that address modern problems in the fields of liquids, solutions and confined systems, critical phenomena, as well as colloidal and biological systems. The papers focus on state-of-the-art developments in the contemporary physics of liquid matter, and are divided into four parts: (i) water and water systems, (ii) physical–chemical properties of liquid systems, (iii) aggregation in liquid systems, and (iv) biological aspects of liquid systems, irradiation influences on liquid systems. Taken together, they cover the latest developments in the broader field of liquid states, including interdisciplinary problems.
Download or read book Chemical Triggering written by Gebran J. Sabongi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical reactions which can, on demand, be switched on and off are valuable for industrial applications. In order to make the best use ofthese reactions, it is essential to have them readily available for a research chemist. The chemical literature, in general, has not yet identified or grouped such reactions. However, their existence is relatively abundant. This book is meant as a survey ofthose reactions which have potential utility in industrially useful processes. These reactions are grouped under the title ofchemical release reactions which can be triggered by heat, light, electric current, etc., to release a specific compound from, or change in the physical or chemical properties of, a unimolecular reactant. The book is divided into chapters covering ways to trigger the release of certain chemicals. Each chapter is further divided into sections, each beginning with a brief introduction ofanalogies ofthe discussed reactions and of how they were used in reported industrial processes. This survey is not meant to be absolute or exhaustive but rather to be directive, to be as complete as possible, and to provide food for further thought.
Download or read book Veterinary Toxicology for Australia and New Zealand written by Rosalind Dalefield and published by Elsevier. This book was released on 2017-06-23 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: Veterinary Toxicology for Australia and New Zealand is a reference suited to the unique challenges of veterinary practice in Australia and New Zealand. Both streamlined and thorough in its coverage of poisons and treatments for those locations, this focused approach allows readers to quickly find relevant information that is presented in a concise and logical manner that is useful to clinicians. The authors draw upon a wealth of knowledge of the particularities of toxicology in Australia and New Zealand to present readers with the up-to-date information required to efficiently and effectively diagnose and treat their patients. - Highlights toxins of specific concern in Australia and New Zealand - Structures information in a logical way so that it can be located quickly - Offers up-to-date information on current and emerging risks
Download or read book Smectic Liquid Crystals written by G. W. Gray and published by . This book was released on 1984 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Anion Sensing written by Ivan Stibor and published by Springer. This book was released on 2014-11-21 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: with contributions by numerous experts
Download or read book Handbook of Fluoropolymer Science and Technology written by Dennis W. Smith and published by John Wiley & Sons. This book was released on 2014-05-05 with total page 671 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Fluoropolymer Science and Technology A comprehensive handbook on fluoropolymer synthesis, characterization, and processing Fluoropolymers, one of the more durable classes of polymer materials, are known to enable novel technologies as a result of their remarkable properties. As key components in industry applications, fluoropolymers have established commercial interest and scientists have discovered more efficient approaches of handling them. This book reviews up-to-date fluoropolymer platforms as well as recently discovered methods for the preparation of fluorinated materials. It focuses on synthesis, characterization, and processing aspects, providing guidelines for practicing scientists and engineers. In addition, the book covers: Concepts and studies from leading international laboratories, including academia, government, and industrial institutions Emerging technologies and applications in energy, optics, space exploration, fuel cells, microelectronics, gas separation membranes, biomedical instrumentation, and more Current environmental concerns associated with fluoropolymers, relevant regulations, and growth opportunities Overall, the chapters provide coverage of chemical methods and help the reader further understand how fluoropolymer research provides solutions for material challenges. The concepts in this book also inspire professionals to identify new markets and funding sources for fluoropolymer research and development.
