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Author: Jennifer Kirchhoff Publisher: ISBN: Category : Languages : en Pages : 157
Book Description
ABSTRACT: Liquid crystal phases exhibit physical characteristics that lie between those of liquid and crystal phases. The many liquid crystal sub-phases are defined based on the degree of positional and orientational ordering the molecules have and the materials that make up these liquid crystal phases. This thesis presents a study of the molecular packing and physical properties of complex liquid crystal phases using dopants to better examine the stability and packing mechanisms of these phases. It also looks at the dispersion of quantum dots in liquid crystal materials, examining the electro-optical properties of the mixtures. The main goal of this thesis is to examine the effects of dopants on the properties of liquid crystal phases using optical microscopy, differential scanning calorimetry, electro-optical measurements, and X-ray scattering. For those mixtures with quantum dots fluorescence microscopy and photoluminescence measurements were also conducted. Rod-like liquid crystals are commonly used in display applications when the material is in a nematic liquid crystal phase, which is the least ordered phase exhibiting no positional ordering. The more complicated chiral smectic liquid crystal phases, which have a one dimensional layer structure, show potential for faster and tri-stable switching. A chiral rod-like liquid crystal material is doped with both chiral and achiral rod-like liquid crystals to examine the stability of one of the chiral smectic sub-phase, the SmC*FI1 phase. This phase consists of tilted molecules rotating about the cone defined by the tilt angle with a periodicity of three layers and an overall helical structure.
Author: Jennifer Kirchhoff Publisher: ISBN: Category : Languages : en Pages : 157
Book Description
ABSTRACT: Liquid crystal phases exhibit physical characteristics that lie between those of liquid and crystal phases. The many liquid crystal sub-phases are defined based on the degree of positional and orientational ordering the molecules have and the materials that make up these liquid crystal phases. This thesis presents a study of the molecular packing and physical properties of complex liquid crystal phases using dopants to better examine the stability and packing mechanisms of these phases. It also looks at the dispersion of quantum dots in liquid crystal materials, examining the electro-optical properties of the mixtures. The main goal of this thesis is to examine the effects of dopants on the properties of liquid crystal phases using optical microscopy, differential scanning calorimetry, electro-optical measurements, and X-ray scattering. For those mixtures with quantum dots fluorescence microscopy and photoluminescence measurements were also conducted. Rod-like liquid crystals are commonly used in display applications when the material is in a nematic liquid crystal phase, which is the least ordered phase exhibiting no positional ordering. The more complicated chiral smectic liquid crystal phases, which have a one dimensional layer structure, show potential for faster and tri-stable switching. A chiral rod-like liquid crystal material is doped with both chiral and achiral rod-like liquid crystals to examine the stability of one of the chiral smectic sub-phase, the SmC*FI1 phase. This phase consists of tilted molecules rotating about the cone defined by the tilt angle with a periodicity of three layers and an overall helical structure.
Author: Vinita Dhulia Publisher: LAP Lambert Academic Publishing ISBN: 9783659253195 Category : Languages : en Pages : 112
Book Description
While much fundamental research is still performed with pure liquid crystals, industrial applications employ mostly mixtures, composites, or specially doped liquid crystals with tailor-made physical and optical properties.Current progress and large scale application of liquid crystals in optical technology are largely the result of tremendous advances in such new material development efforts.Liquid crystal mixtures formed by different concentrations of the same set of constituents should be regarded as physically and optically different materials.The book contains the experimental work carried on the composite system formed using cholesteric liquid crystal Cholesteryl Pelargonate-(CP)], polymer Poly Methyl Methacrylate(PMMA)] and azobenzene(orange) dye.The parameters that are investigated are the textures, the phase transition temperatures, the absorption in the visible range and infrared absorption.The parameters were investigated for(i)the pure CP, (ii)the composite system formed using CP and PMMA and (iii) for the composite system formed using CP, PMMA and azobenz
Author: Aleksandr V. Ivashchenko Publisher: CRC Press ISBN: 1351079816 Category : Science Languages : en Pages : 361
Book Description
This book provides a systematic presentation of issues pertaining to the development of dichroic dyes applied in electrooptical systems for displaying and processing data. It explains the theory of the guest-host effect and the methodology of engineering dichroic dye (DD) molecules with specified characteristics. The book then examines the properties of currently known DDs, including the most interesting examples of synthesis. Various aspects of designing LCM for guest-host devices and available designs of guest-host LCDs are considered as well. Characteristics of dichroic dyes are presented in the Appendix as an added benefit to readers.
Author: Lajos Bata Publisher: Elsevier ISBN: 1483150178 Category : Science Languages : en Pages : 704
Book Description
Advances in Liquid Crystal Research and Applications, Volume 1 is a collection of papers presented at the Third Liquid Crystal Conference of the Socialist Countries, held in Budapest on August 27-31, 1979. This volume is comprised of three parts. The first part deals with the phases and structures of liquid crystals through methods employing synthesis, X-ray studies, electron diffraction, and calorimetric determination. The second part discusses molecular dynamics and dynamical methods where mostly dielectric investigations into liquid crystal properties are emphasized. This part includes the developments in the study of molecular dynamics in liquid crystals. Other topics presented in this part are the acousto-optical and ultrasonic relaxation methods. The third part covers the continual properties of liquid crystals: their properties and behavior when exposed to different testing methods and variables. For example, a correlation between viscosity coefficients of starting components and those of their mixtures is attempted, resulting when MBBA and EBBA in different percentages are mixed, that none of their coefficients is found to obey any pronounced law. However, the viscosity coefficients given in the table may serve as reference data for further studies. Physicists; process engineers; and graduate students in physics, chemistry, and materials science fields; and university professors and lecturers related to studies in the field of liquid crystals will find this collection of papers highly informative and rewarding.
Author: G. Meier Publisher: Springer Science & Business Media ISBN: 3642809545 Category : Science Languages : en Pages : 171
Book Description
Over the past ten years liquid crystals have attracted much interest and considerable progress has been made with respect to our knowledge in this field. The recent development was initiated mainly by the work of J. L. Fergason and G. H. Heilmeier, who pointed out the importance of liquid crystals for thermographic and electro optic applications. The first part of this book is a brief introduction to the physics of liquid crystals. The structures and properties of the three basic types of liquid crystals are discussed. A special paragraph is devoted to electric-field effects, which are important in display applications. The chapter on Scientific Applications gives an insight into the potential applications of liquid crystals in fundamental research, with special emphasis on explaining the principles involved. Two groups of potential applications are discussed in detail: 1. the use of liquid crystals as anisotropic solvent for the determination of molecular properties by means of spectroscopy, and 2. their use in analytical chemistry, particularly in gas chromatography. The reverse process involves the use of the dissolved molecules as microscopic probes in the investigation of the dynamical molecular structure of anisotropic fluid systems (e.g. biological membranes). This extremely important technique is also described.
Author: Patrick Oswald Publisher: CRC Press ISBN: 0203023013 Category : Science Languages : en Pages : 624
Book Description
Liquid crystals allow us to perform experiments that provide insight into fundamental problems of modern physics, such as phase transitions, frustration, elasticity, hydrodynamics, defects, growth phenomena, and optics (linear and non linear). This excellent volume meets the need for an up-to-date text on liquid crystals.Nematic and Cholesteric Liq
Author: G P Crawford Publisher: CRC Press ISBN: 9780748404643 Category : Science Languages : en Pages : 528
Book Description
Focusing on the applied and basic aspects of confined liquid crystals, this book provides a current treatise of the subject matter and places it in the broader context of electrooptic applications. The book takes an interdisciplinary approach to the
Author: S Kai Publisher: World Scientific ISBN: 9814555339 Category : Languages : en Pages : 596
Book Description
In this volume, the problems of pattern formation in physics, chemistry and other related fields in complex and nonlinear dissipative systems are studied. Main subjects discussed are formation mechanisms, properties, statistics, characterization and dynamics of periodic and nonperiodic patterns in the electrohydrodynamics in liquid crystals, Rayleigh-Benard convection, crystallization, viscous fingering and Belouzov-Zhabotinsky chemical reaction. Recent developments in topological and defect-mediated chaos, chaos in systems with large degrees of freedom and turbulence-turbulence transitions are also discussed.
Author: Jennifer Kirchhoff
Author: Jennifer Kirchhoff
Author: Vinita Dhulia
Author: Aleksandr V. Ivashchenko
Author: Lajos Bata
Author: G. Meier
Author: Patrick Oswald
Author: Mohammad Reza Daj
Author: G P Crawford
Author: S Kai
Author: