Adsorption Phenomena and Anchoring Energy in Nematic Liquid Crystals: 1st Edition (Hardback) book cover

Adsorption Phenomena and Anchoring Energy in Nematic Liquid Crystals

1st Edition

By Giovanni Barbero, Luiz Roberto Evangelista

CRC Press

368 pages | 100 B/W Illus.

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pub: 2005-07-28
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Description

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, Adsorption Phenomena and Anchoring Energy in Nematic Liquid Crystals provides an account of new and established results spanning three decades of research into the problems of anchoring energy and adsorption phenomena in liquid crystals.

The book contains a detailed discussion of the origin and possible sources of anchoring energy in nematic liquid crystals, emphasizing the dielectric contribution to the anchoring energy in particular. Beginning with fundamental surface and anchoring properties of liquid crystals and the definition of the nematic phase, the authors explain how selective ion adsorption, dielectric energy density, thickness dependence, and bias voltage dependence influence the uniform alignment of liquid crystals and affect the performance of liquid crystal devices. They also discuss fundamental equations regulating the adsorption phenomenon and the dynamic aspects of ion adsorption phenomenon in liquid crystalline systems.

Adsorption Phenomena and Anchoring Energy in Nematic Liquid Crystals serves as an excellent source of reference for graduates and researchers working in liquid crystals, complex fluids, condensed matter physics, statistical physics, chemical engineering, and electronic engineering, as well as providing a useful general introduction to and background information on the nematic liquid crystal phase.

Reviews

"…researchers working in the field of surface phenomena of liquid crystals and in related fields will benefit from the book as a source of reference as well as an extensive theoretical treatment of anchoring and the effects of ionic adsorption. For graduate students with some background in theoretical physics it serves as a comprehensive introduction to anchoring and adsorption in nematic liquid crystals."

- Dr. Christian Bahr, ChemPhysChem, 2006

Table of Contents

NEMATIC LIQUID CRYSTALS: FUNDAMENTALS AND BULK PROPERTIES

Nematic Order Parameters

Maier-Saupe Approach for the Nematic-Isotropic Phase Transition

Continuum Description of the Nematic Phase

External Field Contribution to the Elastic Energy Density

Equilbrium Configuration in Strong and Weak Anchoring Situations

NEMATIC LIQUID CRYSTALS: SURFACE PROPERTIES

Anchoring

The Anchoring Energy Function

Periodic Deformations in Nematic Liquid Crystals

Spontaneous Periodic Distortions in Nematic Liquid Crystals: Dependence on the Tilt Angle

Theoretical Models for the Surface Free Energy

Stochastic Contribution to the Anchoring Energy: Deviation from the Rapini-Papolar Expression

Validity of the Elastic Model for Nematic Surface Anchoring Energy

Contribution of the Smectic-Nematic to the Surface Energy

TEMPERATURE DEPENDENCE OF THE SURFACE FREE ENERGY

Thermal Relaxation Model of Surface Director Gliding in Lyotropic Liquid Crystals

Thermal Renormalization of the Anchoring Energy

Temperature Induced Surface Transition in Nematic Liquid Crystals Oriented by Evaporated SiOx

A Local Self-Consistent Approach to the Phase Transition at the Nematic Liquid Crystal - Wall Interface

SURFACE ADSORPTION OF PARTICLES: GENERAL CHARACTERISTICS

Introduction

Statement of the Problem: Langmuir's Isotherm

Surface Adsorption and Anchoring Transition

Photo-Manipulation of the Anchoring Strength of Photochromic Nematic Liquid Crystal

Adsorption of Magnetic Grains in Magnetic Fluids

Selective Ionic Adsorption in Liquid Crystals

SURFACE ELECTRIC FIELD-INDUCED INSTABILITIES IN NEMATIC LIQUID CRYSTALS SAMPLE

The General Electrostatic Model

Analysis I: Variation Solution of the Eigenvalue Problem

Analysis II: Series Solution of the Eigenvalue Problem

Role of the Elastic Term Linear in the Spatial Derivatives of the Nematic Director in a 1D Geometry

Conclusions

IONS AND NEMATIC SURFACE ENERGY: BEYOND THE EXPONENTIAL APPROXIMATION FOR THE ELECTRIC FIELD OF IONIC ORIGIN

Introduction

Theoretical Model: Non-Linear Poisson-Boltzman Equation

External Electric Field Effect in the Nematic Anchoring Energy

Contribution to the Surface Energy of Dielectric Origin

Conclusions

ADSORPTION PHENOMENON AND EXTERNAL FIELD EFFECT ON AN ISOTROPIC LIQUID CONTAINING IMPURITIES

Introduction

The Model

The Charge and Field Distributions

Ionic Adsorption in the Absence of External Equilibrium Distribution of Charges

Extensions of the Model

Influence of the Adsorption Energy in the Dieletric Contribution to the Anchoring Energy

FERMILIKE DESCRIPTION OF THE ADSORPTION PHENOMENON

Introduction

The Fermi-Like Model

Application: Ion Adsorption in Isotropic Fluids

Limits

Numerical Results

Conclusions

About the Series

Liquid Crystals Book Series

The Liquid Crystals Book Series publishes authoritative accounts of all aspects of the field, ranging from the basic fundamentals to the forefront of research, from the physics of liquid crystals to their chemical and biological properties, and from their self-assembling structures to their applications in devices. The series provides readers new to liquid crystals with a firm grounding in the subject, while offering experienced scientists and liquid crystallographers an indispensable resource to enhance their own research.

Learn more…

Subject Categories

BISAC Subject Codes/Headings:
SCI013050
SCIENCE / Chemistry / Physical & Theoretical
SCI013060
SCIENCE / Chemistry / Industrial & Technical
SCI077000
SCIENCE / Solid State Physics