Download or read book Study of the Interaction Between Near surface and Bulk Microstructure in Liquid Crystals written by Vinaya Sequeira and published by . This book was released on 1997 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surfaces and Interfaces of Liquid Crystals written by Theo Rasing and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the state of the art of our understanding of liquid-crystal interfaces on a molecular level. The interactions of liquid crystal molecules with a surface play an essential role in the operation of liquid crystal displays (LCD's) and other LC devices that are based on the controllable anchoring of LC molecules on polymer coated surfaces. This book addresses the microscopic interaction between a macromolecule (liquid crystal, polymer) and a wall, using state of the art surface and interface-sensitive experimental techniques, such as Atomic Force Microscopy (AFM), Scanning Tunneling Microscopy (STM), Linear and Nonlinear Optical Microscopy and (Dynamic) Light Scattering (DLS). These experimental techniques were complemented with computer simulations and supra molecular chemistry methods to develop controllable polymeric surfaces.
Download or read book Surfaces and Interfaces of Liquid Crystals written by Theo Rasing and published by . This book was released on 2014-01-15 with total page 312 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 2005 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structure and Properties of Liquid Crystals written by Lev M. Blinov and published by Springer Science & Business Media. This book was released on 2010-10-26 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book by Lev M. Blinov is ideal to guide researchers from their very first encounter with liquid crystals to the level where they can perform independent experiments on liquid crystals with a thorough understanding of their behaviour also in relation to the theoretical framework. Liquid crystals can be found everywhere around us. They are used in virtually every display device, whether it is for domestic appliances of for specialized technological instruments. Their finely tunable optical properties make them suitable also for thermo-sensing and laser technologies. There are many monographs written by prominent scholars on the subject of liquid crystals. The majority of them presents the subject in great depth, sometimes focusing on a particular research aspect, and in general they require a significant level of prior knowledge. In contrast, this books aims at an audience of advanced undergraduate and graduate students in physics, chemistry and materials science. The book consists of three parts: the first part, on structure, starts from the fundamental principles underlying the structure of liquid crystals, their rich phase behaviour and the methods used to study them; the second part, on physical properties, emphasizes the influence of anisotropy on all aspects of liquid crystals behaviour; the third, focuses on electro-optics, the most important properties from the applications standpoint. This part covers only the main effects and illustrates the underlying principles in greater detail. Professor Lev M. Blinov has had a long carrier as an experimentalist. He made major contributions in the field of ferroelectric mesophases. In 1985 he received the USSR state prize for investigations of electro-optical effects in liquid crystals for spatial light modulators. In 1999 he was awarded the Frederiks medal of the Soviet Liquid Crystal Society and in 2000 he was honoured with the G. Gray silver medal of the British Liquid Crystal Society. He has held many visiting academic positions in universities and laboratories across Europe and in Japan.
Download or read book Study of Friction Between Liquid Crystals and Crystalline Surfaces by Molecular Dynamic Simulations Supported by the National Natural Science Foundation of China Under Grant Nos 11504384 and 11121403 and Computational Resources Provided by Supercomputing Center of Chinese Academy of Sciences SCCAS written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The lubrication characteristics of liquid crystal (LC) molecules sheared between two crystalline surfaces obtained from molecular dynamics (MD) simulations are reported in this article. We consider a coarse-grained rigid bead-necklace model of the LC molecules confined between two atomic surfaces subject to different shearing velocities. A systematic study shows that the slip length of LC lubrication changes significantly as a function of the LC-surface interaction energy, which can be well described though a theoretical curve. The slip length increases as shear rate increases at high LC-surface interaction energy. However, this trend can not be observed for low interaction energy. The orientation of the LC molecules near the surface is found to be guided by the atomics surfaces. The influence of temperature on the lubrication characteristics is also discussed in this article.
Download or read book Advances in Liquid Crystals written by Glenn H. Brown and published by Academic Press. This book was released on 2013-10-22 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Liquid Crystals, Volume 5 is a collection of scientific essays that focuses on the developments and applications in the field of liquid crystal science. The text begins with an article about the role of liquid crystals in living systems. The subjects covered in this article include the properties of phospholipids, lipid order parameters, lipid diffusion, and the movements of proteins in model and natural biomembranes. The second essay discusses the use of Mossbauer techniques to lyotropic liquid crystals. Such a method provides a list of characteristics of the crystals in focus. Another topic of interest is the theoretical and experimental aspects of microemulsions. The section that follows describes the carbonaceous mesophases and disclination structures. Types of disclination such as wedge disclination, twist disclinations, and disclinations arrays are covered. The neutron incoherent scattering is the focus of the last essay in the book. The book will provide valuable insights for scientists, developer of crystal displays, students, and researchers in the field of chemistry.
Download or read book Study of Solid Surface Interactions with Binary Liquid Mixtures and Liquid Crystals written by Robert Dale Polak and published by . This book was released on 1999 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2002 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interaction of Liquid Crystals with Inhomogeneous Surfaces written by R. B. Meyer and published by . This book was released on 1985 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: We undertook the study of the interaction of nematic liquid crystals with inhomogeneous solid surfaces, in the attempt to better understand surface interactions and to fabricate new kinds of devices with novel surface alignment techniques. Along with the surface studies, we considered the optic properties of the new liquid crystal configurations we were attempting to fabricate, and new electro-optical effects that might be achieved. The new surface treatments that we investigated were ones consisting of a microscopically inhomogeneous array of different aligning agents. The cases studied in detail were that of a surface which aligns the nematic director perpendicular to itself, on which we created a random array of spots, a few hundred angstroms in diameter, in which the director is parallel to the surface, and the inverse, i.e., spots of vertical alignment on a horizontal aligning surface. Keywords include: Liquid crystals, Surface properties, Nematic liquid crystals, and Optical properties.
Download or read book The Surface Physics of Liquid Crystals written by A. A. Sonin and published by Gordon & Breach Science Pub. This book was released on 1995 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: In addition to the physical aspects of the problems of interaction of liquid crystals with substrates (e.g. anchoring energy, contact angle, surface order parameter, van der Waals forces) production problems are also covered, such as methods of orienting liquid crystals. Liquid crystals -- systems intermediating from the structural point of view between ordinary liquids and solid crystals -- are very sensitive to the action of any surface. This makes the interfacial phenomena in these substances extraordinarily variable and interesting. In this comprehensive monograph, the author presents a comprehensive review of the current state and potential future of the study of the surface of liquid crystals.
Download or read book Liquid Crystals written by Pankaj Kumar Choudhury and published by BoD – Books on Demand. This book was released on 2018-02-28 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid crystals exhibit amazingly interesting properties that make them indispensable for several technological applications. The book Liquid Crystals - Recent Advancements in Fundamental and Device Technologies is aimed to focus on various aspects of research and development that liquid crystal mediums have come across in recent years. This would be ranging from the physical and chemical properties to the important applications that the liquid crystals have in our everyday life. It is expected that the book will make the expert researchers to be abreast of recent research advancements, whereas the novice researchers will benefit from both the conceptual understanding and the recent developments in the area. Multitudes of research themes and directions pivoted to liquid crystals remain the essence, which the readers would get the glimpse of and move ahead for further investigations.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reports on Progress in Polymer Physics in Japan written by and published by . This book was released on 1999 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research in Progress written by and published by . This book was released on 1992 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Liquid Crystal Alignment and Relaxation Dynamics at Surface Modified Thin Polymer Films written by Dena Mae Agra-Kooijman and published by . This book was released on 2008 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: The physical and chemical nature of bare surfaces and of thin films of polymers deposited in solid substrates plays a key role in the alignment of liquid crystal (LC). The ability to define the polar and azimuthal direction of the LC director at substrate-LC interface is at the heart of electro-optical applications of liquid crystals. However, the precise mechanism(s) of LC alignment have remained shrouded in mystery. The research conducted under this project was aimed at gaining insight into the relationship between LC alignment and the surface structure/morphology and to understand the dynamics of polymer chains at the polymer-air interface and under confinement to small dimensions. The results presented here show that properties of thin polymer films, such as glass transition temperature, Tg, and chain mobility are significantly different from bulk polymers. However, the understanding of the underlying reasons for these effects is far from complete. The studies of various polymers (weight molecular weight, radius of gyration) in different film geometries (supported on substrate or free standing) using different techniques reveal either an increase or a decrease in Tg and/or chain mobility with decreasing film thickness. Although the shifts of the Tg are a clear indication of the differences between the polymer chain mobility in the bulk and thin films, the measurements of Tg's are only an indirect method to probe their relaxation dynamics. The measurement of optical retardation, a simple optical technique requiring no physical contact with the polymer film, has been employed to directly probe the relaxation dynamics of variously treated thin polymer films routinely used for liquid crystal alignment. Using the relaxation model based on Kohlrausch-Williams-Watts, the Tg's of polystyrene films were determined as a function of the thickness and rubbing strengths (depths). Tg's are significantly reduced by 15-20 K for films of thickness less than 250 ... This correlates very well with previous studies on similar systems but using different methods. In addition, Tg decreases with rubbing depth indicating that polymer molecules close to the film-air interface relax faster than the molecules farther from the interface. The dependence of Tg on the rubbing strength provides clear evidence that polymer chains at the surface relax more readily. The morphology of polymer films was determined using high-resolution x-ray reflectivity, which is a sensitive and direct probe of surface structure at submicron levels. Making use of the inherent anisotropy in the coherence area of the x-ray beam, the morphological anisotropy of the films was quantitatively determined. The films' surfaces were modified by a specific treatment (i.e., rubbing or exposing to linearly polarized UV). Knowledge of the vertical root mean square (rms) roughness parallel and perpendicular to the treatment direction is of great importance in understanding the exact role in liquid crystal alignment of the nature of the surface. Reflectivity scans on the treated surfaces reveal roughness anisotropy, i.e., roughness is significantly different in the two orthogonal directions on the substrate plane. This direction of a more roughness is perpendicular to the azimuthal direction of the liquid crystal alignment. Hence, liquid crystal molecules align in the smoother direction.
