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Author: Xingzhou Tang
Publisher:
ISBN:
Category : Liquid crystals
Languages : en
Pages : 0
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Book Description
The structure and dynamics of topological defects are important features of liquid crystals. This doctoral dissertation research has focused on the geometry and dynamics of defects by regarding them as particles. We can describe defects by tensors and study their dynamics macroscopically. We find that a minimization principle can be applied to certain systems, and thus we get an alternate way to understand fluid flow and largely simplify the simulation. I will also show that in passive systems, the difference of Frank constants introduces extra torque for the defect, and in active systems, the activity gradient aligns the defects like an electric field is acting on dipoles.
Author: Xingzhou Tang
Publisher:
ISBN:
Category : Liquid crystals
Languages : en
Pages : 0
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Book Description
The structure and dynamics of topological defects are important features of liquid crystals. This doctoral dissertation research has focused on the geometry and dynamics of defects by regarding them as particles. We can describe defects by tensors and study their dynamics macroscopically. We find that a minimization principle can be applied to certain systems, and thus we get an alternate way to understand fluid flow and largely simplify the simulation. I will also show that in passive systems, the difference of Frank constants introduces extra torque for the defect, and in active systems, the activity gradient aligns the defects like an electric field is acting on dipoles.
Author: Peter Palffy-Muhoray
Publisher: Routledge
ISBN: 1351454250
Category : Science
Languages : en
Pages : 480
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Book Description
During his distinguished scientific career, Alfred Saupe made important contributions to liquid crystal research, laying the groundwork on which much of the current knowledge and research in the physics of liquid crystals is based. This volume features papers presented by Prof. Saupe's colleagues, students and friends at a festschrift in honor of his 70th birthday. In addition, a selection of Prof. Saupe's articles are reprinted in the original German and in English translation, offering the reader a unique opportunity to see both the early work of this important scientist and widespread effect of that work on later discoveries in liquid crystal physics.
Author: Patricia Cladis
Publisher: CRC Press
ISBN: 9789056996499
Category : Science
Languages : en
Pages : 490
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Book Description
During his distinguished scientific career, Alfred Saupe made important contributions to liquid crystal research, laying the groundwork on which much of the current knowledge and research in the physics of liquid crystals is based. This volume features papers presented by Prof. Saupe's colleagues, students and friends at a festschrift in honor of his 70th birthday. In addition, a selection of Prof. Saupe's articles are reprinted in the original German and in English translation, offering the reader a unique opportunity to see both the early work of this important scientist and widespread effect of that work on later discoveries in liquid crystal physics.
Author: Oleg D. Lavrentovich
Publisher: Springer Science & Business Media
ISBN: 9401005125
Category : Science
Languages : en
Pages : 356
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Book Description
Topological defects are the subject of intensive studies in many different branches of physics ranging from cosmology to liquid crystals and from elementary particles to colloids and biological systems. Liquid crystals are fascinating materials which present a great variety of these mathematical objects and can therefore be considered as an extremely useful laboratory for topological defects. This book is the first attempt to present together complementary approaches to the investigations of topological defects in liquid crystals using theory, experiments and computer simulations.
Author:
Publisher:
ISBN:
Category : Liquid crystals
Languages : en
Pages : 156
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Book Description
Author: Alberto de Lózar Muñoz
Publisher: Cuvillier Verlag
ISBN: 3865376126
Category :
Languages : en
Pages : 153
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Book Description
Author: Jiuzhi Xue
Publisher:
ISBN:
Category : Ferroelectric crystals
Languages : en
Pages : 294
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Book Description
Author: G.R. Luckhurst
Publisher: Springer Science & Business Media
ISBN: 9401111685
Category : Science
Languages : en
Pages : 612
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Book Description
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.
Author: Igor Muševič
Publisher: Springer
ISBN: 3319549162
Category : Science
Languages : en
Pages : 313
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Book Description
This book brings together the many concepts and discoveries in liquid crystal colloids contributed over the last twenty years and scattered across numerous articles and book chapters. It provides both a historical overview of the development of the field and a clear perspective on the future applications in photonics. The book covers all phenomena observed in liquid crystal colloids with an emphasis on experimental tools and applications of topology in condensed matter, as well as practical micro-photonics applications. It includes a number of spectacular manifestations of new topological phenomena not found or difficult to observe in other systems. Starting from the early works on nematic colloids, it explains the basics of topological defects in ordered media, charge and winding, and the elastic forces between colloidal particles in nematics. Following a detailed description of experimental methods, such as optical tweezing and particle tracking, the book eases the reader into the theoretical part, which deals with elastic deformation of nematic liquid crystals due to inclusions and surface alignment. This is discussed in the context of basic mean field Landau-de Gennes Q-tensor theory, with a brief explanation of the free-energy minimization numerical methods. There then follows an excursion into the topology of complex nematic colloidal structures, colloidal entanglement, knotting and linking. Nematic droplets, shells, handlebodies and chiral topological structures are addressed in separate chapters. The book concludes with an extensive chapter on the photonic properties of nematic dispersions, presenting the concept of integrated soft matter photonics and discussing the concepts of nematic and chiral nematic microlasers, surface-sensitive photonic devices and smectic microfibers. The text is complemented by a large bibliography, explanatory sketches and beautiful micrographs.
Author: Alireza Shams
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
"Liquid crystals are self-organized viscoelastic materials with long range partial orientational order. Imperfection in this order gives rise to point, line, and wall defects whose dynamics and geometry reflects their anisotropic elasticity and viscosity. For line defects confinement acts as an external field that affects defect dynamics and geometric line curvature. The present thesis uses the renormalization of line defect dynamics and geometry due to confinement to extract viscoelastic properties, thus avoiding complex rheological measurement. The chosen geometries are cylindrical and conical capillaries, where the latter displays confinement gradients common in biological liquid crystal self-assembly. The work starts with the classical theory of liquid crystal elasticity which in 1dimension is shown for the first time to map into the Euler elastica model for elastic strings with tension and bending stiffness. The tension and bending coefficients in the liquid crystal elastic are derived in terms of elastic moduli of the bulk phase.Using thermal quenches, textural transformations involving disclination lines are found and described using geometric-elastica models. The different stages in the transformations have unique features such as branching, loop collisions, loop growth, that are compared for cylindrical capillaries to actual experiments from our team experimental collaborators. The extracted viscoelastic data are shown to be in good agreement with available viscoelastic data. The theory and modelling was extended to conical capillaries and new predictions due to confinement-driven gradients are analyzed. The developed theory and simulations provides an efficient new methodology to use defect physics for quantitative predict viscoelastic properties in anisotropic soft matter." --
