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Atlas Of Vibrational Spectra Of Liquid Crystals
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Book Synopsis Atlas Of Vibrational Spectra Of Liquid Crystals by : Marco P Fontana
Download or read book Atlas Of Vibrational Spectra Of Liquid Crystals written by Marco P Fontana and published by World Scientific. This book was released on 1988-08-01 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: This atlas is the first one in the field of vibrational spectroscopy of polyatomic molecules. It is divided into two paragraphs. The first deals with the theory of vibrational spectroscopy in a concise form and considers the most important spectroscopical parameters — frequencies, bandshape and intensities. The second paragraph is dedicated to the infrared (2000-400 cm-1), far infrared (400-40 cm-1) and Raman (2000-10 cm-1) spectra of about hundred different mesomorphic materials with various molecular structure. The polarized IR spectra of the most important liquid crystals is also included. In the second paragraph the assignment of the IR bands to the corresponding intramolecular vibrations is also reported. Almost all spectra is registrated and analysed for the first time. The major important features are: 1. Registration and analysis (for the first time) of vibrational spectra of polyatomic molecules with mesomorphic phases; 2. Registration (for the first time) of vibrational spectra of polyatomic molecules with mesomorphic phase in polarized IR light. Polarized vibrational spectra are very important for clarification of the molecular structure; 3. Assignment (for the first time) of the IR bands of the most important liquid crystalline materials to the corresponding vibrations.
Book Synopsis Atlas of Vibrational Spectra of Liquid Crystals by : Paraskeva Simova
Download or read book Atlas of Vibrational Spectra of Liquid Crystals written by Paraskeva Simova and published by World Scientific. This book was released on 1988 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: This atlas is the first one in the field of vibrational spectroscopy of polyatomic molecules. It is divided into two paragraphs. The first deals with the theory of vibrational spectroscopy in a concise form and considers the most important spectroscopical parameters ? frequencies, bandshape and intensities. The second paragraph is dedicated to the infrared (2000?400 cm-1), far infrared (400?40 cm-1) and Raman (2000?10 cm-1) spectra of about hundred different mesomorphic materials with various molecular structure. The polarized IR spectra of the most important liquid crystals is also included. In the second paragraph the assignment of the IR bands to the corresponding intramolecular vibrations is also reported. Almost all spectra is registrated and analysed for the first time. The major important features are: 1. Registration and analysis (for the first time) of vibrational spectra of polyatomic molecules with mesomorphic phases; 2. Registration (for the first time) of vibrational spectra of polyatomic molecules with mesomorphic phase in polarized IR light. Polarized vibrational spectra are very important for clarification of the molecular structure; 3. Assignment (for the first time) of the IR bands of the most important liquid crystalline materials to the corresponding vibrations.
Book Synopsis Vibrational Spectroscopy of Liquid Crystals by : Nikolaĭ Kirov
Download or read book Vibrational Spectroscopy of Liquid Crystals written by Nikolaĭ Kirov and published by . This book was released on 1984 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Molecular Dynamics of Liquid Crystals by : G.R. Luckhurst
Download or read book The Molecular Dynamics of Liquid Crystals written by G.R. Luckhurst and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid-crystalline phases are now known to be formed by an ever growing range of quite diverse materials, these include those of low molecular weight as well as the novel liquid-crystalline polymers, such phases can also be induced by the addition of a solvent to amphiphilic systems leading to lyotropic liquid crystals. Irrespective of the structure of the constituent molecules these numerous liquid-cl)'Stailine phases are characterised by their long range orientational order. In addition certain phases exhibit elements of long range positional order. Our understanding, both experimental and theoretical, at the molecular level of the static behaviour of these fascinating and important materials is now well advanced. In contrast the influence of the long range order; both orientational and positional, on the molecular dynamics in liquid Cl)'Stais is less well understood. In an attempt to address this situation a NATO Advanced Study Institute devoted to liquid ctystal dynamics was held at n Ciocco, Barga, Italy in September 1989. This brought together experimentalists and theoreticians concerned with the various dynamical processes occurring in all liquid crystals. The skills of the participants was impressively wide ranging; they spanned the experimental techniques used in the study of molecular dynamics, the nature of the systems investigated and the theoretical models employed to understand the results. While much was learnt it was also recognised that much more needed to be done in order to advance our understanding of molecular dynamics in liquid Cl)'Stais.
Book Synopsis Physics of Liquid Crystalline Materials by : Chor-San Heng Khoo
Download or read book Physics of Liquid Crystalline Materials written by Chor-San Heng Khoo and published by CRC Press. This book was released on 1991-12-16 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work is based on lectures delivered at the "summer school" held in October 1988. Papers deal with microscopic properties, collective phenomena (elastic properties, hydrodynamics, linear and nonlinear optics . . . ), and such diverse topics as NMR studies of liquid crystals, orientational disorder and dynamics, rheology of layered liquid crystals, light scattering. Minimal index. Annotation copyrighted by Book News, Inc., Portland, OR
Book Synopsis Long-lived Probes to Study the Dynamics of Liquid Crystals by Ultrafast Infrared Vibrational Spectroscopy by : Kathleen P. Sokolowsky
Download or read book Long-lived Probes to Study the Dynamics of Liquid Crystals by Ultrafast Infrared Vibrational Spectroscopy written by Kathleen P. Sokolowsky and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nematic liquid crystals have been widely studied in the context of practical applications and the nature of phase transitions. Above the nematic-isotropic phase transition temperature (TNI), orientational fluctuations are correlated; the existence of these pseudonematic domains in the isotropic phase dominate the dynamic properties of the bulk liquid. To examine the influence of pseudonematic ordering on the local dynamics, ultrafast infrared (IR) spectroscopies were employed. Two dimensional (2D) vibrational echo spectroscopy supplies information on the spectral diffusion of a vibrational probe molecule. Spectral diffusion is the process by which the frequency of an oscillator changes as the liquid structure about it evolves; it is characterized by the frequency-frequency correlation function (FFCF). The FFCF directly relates the frequency fluctuations of the probe molecule to the dynamics of the liquid structure surrounding it. The model nematic liquid crystal system selected is 4-cyano-4'-pentylbiphenyl (5CB); 5CB contains a nitrile group which can act as the vibrational probe. Examination of the natural abundance carbon-13 nitrile stretch allows for thicker samples, mitigating heating effects. Unfortunately, the vibrational lifetime of the carbon-13 stretch is short, and spectral diffusion is not nearly complete in the experimental window. Two novel extended lifetime vibrational probes similar in structure to 5CB were synthesized. A small amount of either molecule can be added to 5CB to probe the local structure dynamics. OHD-OKE experiments were performed on the doped solutions confirm that the addition of vibrational probe molecule does not significantly perturb the pseudonematic domains of 5CB. Temperature dependent 2D IR experiments were conducted on 5CB and 4-pentylbiphenyl (5B). 5B is molecularly very similar to 5CB, but is not a liquid crystal. The spectral diffusion dynamics in the two liquid are remarkably similar far removed from the liquid crystal phase transition. Close to TNI, the dynamics in 5CB slow down dramatically. The time constants for spectral diffusion are shown to diverge as a[T*/(T-T*)]^1/2. The temperature dependence of the time constants matches that of the size of the pseudonematic domains, not the orientational relaxation time for the domains. Two more liquid crystals are shown to have the same behavior approaching their respective phase transitions, suggesting the divergence may be universal for rod-shaped nematogens. Even at temperatures very close to TNI, spectral diffusion in liquid crystals is complete on the order of a few nanoseconds. This is drastically different than the time for total orientational relaxation which is multiple orders of magnitude slower. The complete randomization of pseudonematic domains is not required for the vibrational probe to sample all structures that contribute to the inhomogeneous line shape. A mode coupling model is constructed for the FFCF to describe spectral diffusion in terms of coupling to large wave vector density fluctuations and orientational fluctuations. The source of spectral diffusion is proposed to be small wave vector density fluctuations, which critically slow as TNI is approached.
Book Synopsis Liquid Crystals and their Computer Simulations by : Claudio Zannoni
Download or read book Liquid Crystals and their Computer Simulations written by Claudio Zannoni and published by Cambridge University Press. This book was released on 2022-07-28 with total page 703 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive introduction to liquid crystals and their computer simulations suitable for students, researchers and industrial scientists.
Book Synopsis Molecular Structure and Orientational Behavior in Antiferroelectric Liquid Crystals Studied by Vibrational Spectroscopy by : Kyeong Hyeon Kim
Download or read book Molecular Structure and Orientational Behavior in Antiferroelectric Liquid Crystals Studied by Vibrational Spectroscopy written by Kyeong Hyeon Kim and published by . This book was released on 1994 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physical Properties of Liquid Crystals by : George W. Gray
Download or read book Physical Properties of Liquid Crystals written by George W. Gray and published by John Wiley & Sons. This book was released on 2009-08-14 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook is a unique compendium of knowledge on all aspects of the physics of liquid crystals. In over 500 pages it provides detailed information on the physical properties of liquid crystals as well as the recent theories and results on phase transitions, defects and textures of different types of liquid crystals. An in-depth understanding of the physical fundamentals is a prerequisite for everyone working in the field of liquid crystal research. With this book the experts as well as graduate students entering the field get all the information they need.
Book Synopsis Nuclear Magnetic Resonance of Liquid Crystals by : Ronald Y. Dong
Download or read book Nuclear Magnetic Resonance of Liquid Crystals written by Ronald Y. Dong and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intended for researchers and students in physics, chemistry and materials science, this book provides the necessary background information and sufficient mathematical and physical detail to study the current research literature. The book begins with a survey of liquid crystal phases and field effects, together with an introduction to the basic physics of nuclear magnetic resonance. It then discusses orientational ordering and molecular field theories for various liquid crystal molecules and nmr studies of uniaxial and biaxial phases. Subsequent chapters consider spin relaxation processes and rotational, translational, and internal molecular dynamics of liquid crystals. The final chapter discusses two-dimensional and multiple- quantum nmr spectroscopies and their application in elucidating liquid crystal properties. This second edition, updated throughout, incorporates many new references and includes new mathematical appendices.
Book Synopsis Liquid Crystals by : Pawel Pieranski
Download or read book Liquid Crystals written by Pawel Pieranski and published by John Wiley & Sons. This book was released on 2021-08-31 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book on liquid crystals reports on the new perspectives that have been brought about by the recent expansion of frontiers and overhaul of common beliefs. First, it explores the interaction of light with mesophases, when the light or matter is endowed with topological defects. It goes on to show how electrophoresis, electro-osmosis and the swimming of flagellated bacteria are affected by the anisotropic properties of liquid crystals. It also reports on the recent progress in the understanding of thermomechanical and thermohydrodynamical effects in cholesterics and deformed nematics and refutes the common belief that these effects could explain Lehmann’s observations of the rotation of cholesteric droplets subjected to a temperature gradient. It then studies the physics of the dowser texture, which has remarkable properties. This is of particular interest in regards to nematic monopoles, which can easily be generated, set into motion and collided within it. Finally, this book deals with the spontaneous emergence of chirality in nematics made of achiral molecules, and provides a brief historical context of chirality
Book Synopsis Liquid Crystals: Fundamentals by : Shri Singh
Download or read book Liquid Crystals: Fundamentals written by Shri Singh and published by World Scientific. This book was released on 2002-11-05 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid crystals are partially ordered systems without a rigid, long-range structure. The study of these materials covers a wide area: chemical structure, physical properties and technical applications. Due to their dual nature — anisotropic physical properties of solids and rheological behavior of liquids — and easy response to externally applied electric, magnetic, optical and surface fields liquid crystals are of greatest potential for scientific and technological applications. The subject has come of age and has achieved the status of being a very exciting interdisciplinary field of scientific and industrial research.This book is an outgrowth of the enormous advances made during the last three decades in both our understanding of liquid crystals and our ability to use them in applications. It presents a systematic, self-contained and up-to-date overview of the structure and properties of liquid crystals. It will be of great value to graduates and research workers in condensed matter physics, chemical physics, biology, materials science, chemical and electrical engineering, and technology from a materials science and physics viewpoint of liquid crystals.
Book Synopsis Liquid Crystals by : Peter J. Collings
Download or read book Liquid Crystals written by Peter J. Collings and published by Princeton University Press. This book was released on 2002 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publisher Description
Download or read book Cumulated Index Medicus written by and published by . This book was released on 1972 with total page 1336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biomedical Vibrational Spectroscopy by : Peter Lasch
Download or read book Biomedical Vibrational Spectroscopy written by Peter Lasch and published by John Wiley & Sons. This book was released on 2008-06-27 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive overview of biomedical applications of vibrational spectroscopy focuses on methodologies that are most relevant to biodiagnostics. After a few introductory chapters that summarize the current status of the field, the reference covers current spectroscopic applications; new spectroscopic directions; and study design and the analysis of vibrational spectral fingerprints from complex biological and clinical samples . With chapters contributed by leading international experts, Biomedical Vibrational Spectroscopy is a core resource.
Book Synopsis Progress in Fourier Transform Spectroscopy by : Janos Mink
Download or read book Progress in Fourier Transform Spectroscopy written by Janos Mink and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt: 19 plenary lectures and 203 poster papers presented at the 10th International Conference of Fourier Transform Spectroscopy in Budapest 1995 give an overview on the state-of-the art of this technology and its wide range of applications. The reader will get information on any aspects of FTS including the latest instrumental developments, e.g. in diode array detection, time resolution FTS, microscopy and spectral mapping, double modulation and two-dimensional FTS.
Book Synopsis ISTFA 2013 by : A. S. M. International
Download or read book ISTFA 2013 written by A. S. M. International and published by ASM International. This book was released on 2013-01-01 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume features the latest research and practical data from the premier event for the microelectronics failure analysis community. The papers cover a wide range of testing and failure analysis topics of practical value to anyone working to detect, understand, and eliminate electronic device and system failures.
