Adsorption Phenomena And Anchoring Energy In Nematic Liquid Crystals

Author : Giovanni Barbero
Publisher : CRC Press
ISBN 13 : 1420037455
Total Pages : 367 pages
Book Rating : 4.56/5 ( download)

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Download or read book Adsorption Phenomena and Anchoring Energy in Nematic Liquid Crystals written by Giovanni Barbero and published by CRC Press. This book was released on 2005-07-28 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite the large quantity of phenomenological information concerning the bulk properties of nematic phase liquid crystals, little is understood about the origin of the surface energy, particularly the surface, interfacial, and anchoring properties of liquid crystals that affect the performance of liquid crystal devices. Self-contained and unique,

Author : Geoffrey R. Luckhurst
Publisher : John Wiley & Sons
ISBN 13 : 1118696336
Total Pages : 408 pages
Book Rating : 4.30/5 ( download)

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Download or read book Biaxial Nematic Liquid Crystals written by Geoffrey R. Luckhurst and published by John Wiley & Sons. This book was released on 2015-02-23 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the nematic liquid crystal phase, rod-shaped molecules move randomly but remain essentially parallel to one another. Biaxial nematics, which were first predicted in 1970 by Marvin Freiser, have their molecules differentially oriented along two axes. They have the potential to create displays with fast switching times and may have applications in thin-film displays and other liquid crystal technologies. This book is the first to be concerned solely with biaxial nematic liquid crystals, both lyotropic and thermotropic, formed by low molar mass as well as polymeric systems. It opens with a general introduction to the biaxial nematic phase and covers: • Order parameters and distribution functions • Molecular field theory • Theories for hard biaxial particles • Computer simulation of biaxial nematics • Alignment of the phase • Display applications • Characterisation and identification • Lyotropic, thermotropic and colloidal systems together with material design With a consistent, coherent and pedagogical approach, this book brings together theory, simulations and experimental studies; it includes contributions from some of the leading figures in the field. It is relevant to students and researchers as well as to industry professionals working in soft matter, liquid crystals, liquid crystal devices and their applications throughout materials science, chemistry, physics, mathematics and display engineering.

Author : Rui Guo
Publisher :
ISBN 13 :
Total Pages : 74 pages
Book Rating : 4.02/5 ( download)

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Download or read book Anchoring of Liquid Crystal and Dynamics of Molecular Exchange Between Adsorbed LC Film and the Bulk written by Rui Guo and published by . This book was released on 2008 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the goals of this dissertation project is to understand the anchoring and reorientation, or gliding of the nematic director on a solid substrate. It has been recognized for a long time that a thin adsorbed layer of LC at the subtrate plays an important role in anchoring and the surface memory effect. The model due to Romanenko, et al., which explained the changes in director orientation, postulates that it occurs through continuous changes in the angular distribution function of adsorbed molecules and gradual change in its orientation mediated by adsorption/desoprtion (AD) of liquid crystal (LC) molecules at the interface. Anchoring properties and the AD of molecules between bulk and anisotropically adsorbed LC film have been studied. The adsorbed LC film was prepared by cooling a homogeneously aligned LC cell from the isotropic phase in the presence of a magnetic field parallel to the surface of ITO substrate. The changes in anchoring energy with time and the temperature at which the LC film is annealed, allow an estimation of the activation energy of desorption of LC molecules from ITO surface, E=0.55 eV. The results suggest that hydrogen bonds are responsible for the adsorption of LC molecules onto the substrate. Relationships between the anchoring energy, the direction of easy axis, angular distribution of the adsorbed molecules, and changes in their angular distribution due to AD, are explained using Maier-Saupe theory and Rapini-Papoular surface potential. The second goal is to better understand the AD process. Thin cells are prepared with rubbed polymer alignming surface and two nematic liquid crystals are selected with very different pretilt angles at this polymer's surface. The cells filled with one liquid crystal were prepared to later be replaced by a second LC having a very different pretilt angle, leaving the adsorbed layers intact. The adsorption of second LC molecules and desorption of first LC at the substrate change with time, the composition of the adsorbed layer, and thus, the pretilt angle. The final equilibrium pretilt angle depends on the net concentration of the two liquid crystals in the cell. Time dependence of the molecular pretilt angle after refilling the cell with second LC is measured and found to depend on the characteristic molecular exchange rate and on the coefficients of desorption of the first LC. Experimental results provide an important insight into the molecular exchange between solid surface and bulk fluid.

Author : Wei Lee
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 3110584379
Total Pages : 581 pages
Book Rating : 4.70/5 ( download)

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Download or read book Unconventional Liquid Crystals and Their Applications written by Wei Lee and published by Walter de Gruyter GmbH & Co KG. This book was released on 2021-07-19 with total page 581 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work focuses on recent developments of the rapidly evolving field of Non-conventional Liquid Crystals. After a concise introduction it discusses the most promising research such as biosensing, elastomers, polymer films , photoresponsive properties and energy harvesting. Besides future applications it discusses as well potential frontiers in LC science and technology.

Author : Luiz Roberto Evangelista
Publisher : Cambridge University Press
ISBN 13 : 1107143551
Total Pages : 361 pages
Book Rating : 4.55/5 ( download)

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Download or read book Fractional Diffusion Equations and Anomalous Diffusion written by Luiz Roberto Evangelista and published by Cambridge University Press. This book was released on 2018-01-25 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents a unified treatment of anomalous diffusion problems using fractional calculus in a wide range of applications across scientific and technological disciplines.

Author : David Levy
Publisher : John Wiley & Sons
ISBN 13 : 3527342079
Total Pages : 390 pages
Book Rating : 4.75/5 ( download)

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Download or read book Transparent Conductive Materials written by David Levy and published by John Wiley & Sons. This book was released on 2019-04-29 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Edited by well-known pioneers in the field, this handbook and ready reference provides a comprehensive overview of transparent conductive materials with a strong application focus. Following an introduction to the materials and recent developments, subsequent chapters discuss the synthesis and characterization as well as the deposition techniques that are commonly used for energy harvesting and light emitting applications. Finally, the book concludes with a look at future technological advances. All-encompassing and up-to-date, this interdisciplinary text runs the gamut from chemistry and materials science to engineering, from academia to industry, and from fundamental challenges to readily available applications.

Author : Shri Singh
Publisher : Springer Nature
ISBN 13 : 303150058X
Total Pages : 578 pages
Book Rating : 4.89/5 ( download)

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Download or read book Handbook of Liquid Crystals—Volume I written by Shri Singh and published by Springer Nature. This book was released on with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Patrick Oswald
Publisher : CRC Press
ISBN 13 : 1482275287
Total Pages : 618 pages
Book Rating : 4.85/5 ( download)

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Download or read book Liquid Crystals written by Patrick Oswald and published by CRC Press. This book was released on 2018-10-03 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: These volumes are a result of the personal research and graduate lectures given by the authors at the ecole Normale Superieure de Lyon and the University of Paris VII, respectively. Featuring an easy-to-follow, accessible style, each volume describes important concepts and physical properties using classroom-friendly experiments, many of which the

Author : Albert Schenning
Publisher : CRC Press
ISBN 13 : 1498729746
Total Pages : 164 pages
Book Rating : 4.41/5 ( download)

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Download or read book Liquid Crystal Sensors written by Albert Schenning and published by CRC Press. This book was released on 2017-09-01 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid Crystal Sensors discusses novel applications of liquid crystals that lie beyond electrically driven optical switches and displays. The main focus is on recent progress in the area of sensors based on low molar mass and polymer liquid crystals. This area of research became "hot" in recent years since the possibilities for applications of liquid crystal sensors are growing in many areas, ranging from the detection of mechanical displacements to the detection of environmental pollutants and chemical agents. This book is well-suited for students, as well as scientists from different backgrounds. For students and researchers new to the field, it gives a thorough introduction. For experienced researchers it shows the latest breakthroughs and serves as an inspiration for solving problems or sparking new ideas. Key Features: Emphasizes how liquid crystals are extremely sensitive to external stimuli and therefore can be used for the construction of stimuli-responsive devices, such as sensors Includes the contributions of editors who are deeply involved in the field and author chapters on hot topics such as the sensitivity of liquid crystals to pollutants, UV light, and strain Provides an exclusive on LC sensors where having the data in one place will be very useful to the community Gives more information on sensors and broadens the scope by having a contributed volume rather than authored Combines recent data on advances in the area of liquid crystal sensors that includes many types of liquid crystal materials

Author : Sandeep Kumar
Publisher : CRC Press
ISBN 13 : 1439811458
Total Pages : 512 pages
Book Rating : 4.50/5 ( download)

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Download or read book Chemistry of Discotic Liquid Crystals written by Sandeep Kumar and published by CRC Press. This book was released on 2016-04-19 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: The self-contained properties of discotic liquid crystals (DLCs) render them powerful functional materials for many semiconducting device applications and models for energy and charge migration in self-organized dynamic functional soft materials. The past three decades have seen tremendous interest in this area, fueled primarily by the possibility