Electrokinetic phenomena

About: Electrokinetic phenomena is a research topic. Over the lifetime, 4286 publications have been published within this topic receiving 129277 citations.

Principles of colloid and surface chemistry

Abstract: Colloid and surface chemistry - scope and variables sedimentation and diffusion and their equilibrium solution thermodynamics - osmotic and Donnan equilibria the rheology of dispersions static and dynamic light scattering and other radiation scattering surface tension and contact angle - application to pure substances adsorption from solution and monolayer formation colloidal structures in surfactant solutions - association colloids adsorption at gas-solid interfaces van der Waals forces the electrical double layer and double-layer interactions electrophoresis and other electrokinetic phenomena electrostatic and polymer-induced colloid stability appendix A - examples of expansions encountered in this book appendix B - units - CGS-SI interconversions appendix C - statistics of discrete and continuous distributions of data appendix D - list of worked-out examples

Foundations of Colloid Science

Abstract: Introduction to statistical mechanics of fluids Adsorption from Solution The electrokinetic effects The structure of concentrated dispersions Thin films Emulsions Microemulsions Rheology of colloidal dispersions.

Interfacial Forces in Aqueous Media

Abstract: Introduction PART I: THEORY Lifshitz-van der Waals (LW) Interactions Relation Between the Hamaker Constant and the Apolar Surface Tension Component Polar or Lewis Acid-Base Interactions Electrical Double Layer Interactions Brownian Movement Forces-Osmotic Interactions of Polymers Rate of Decay with Distance PART II: INTERFACIAL PROPERTIES AND STRUCTURE OF LIQUID WATER Lifshitz-van der Waals and Lewis Acid-Base Properties of Liquid Water-Physical and Physico-Chemical Effects Role of Water in Hydrophobic Attraction Role of Water in Hydrophilic Repulsion The Water-Air Interface PART III: EXPERIMENTAL MEASUREMENT METHODS Contact Angle and Surface Tension Determination and Preparation of Solid Surfaces Interfacial Tension Determination-Influence of Macroscopic- and Microscopic-Scale Interactions Different Approaches for Interpreting Contact Angles and Determining the Surface Tension and Surface Tension Components of Solids Electrokinetic Methods Direct Measurement Methods, Treating the Force Balance in Particular PART IV: ASSOCIATED PHENOMENA AND APPLICATIONS Surface Tension Components and Parameters of Liquids and Solids Attractive LW- and AB-Forces: Hydrophobic Interactions-Osmotic Pressures of PEO Solutions Repulsive AB-Forces: Hydrophilic Interactions The Primary and Secondary Interactions Phase Separation in Polymer Solutions Coacervation and Complex Coacervation Solubility of Polymers and Other Solutes Cell and Particle Stability Adsorption and Adhesion in Aqueous Media, Including Ligand-Receptor Interactions Kinetics and Energetics of Protein Adsorption onto Metal Oxide Surfaces List of Symbols Used References Index

Introduction to colloid and surface chemistry

Abstract: CONTENTS INCLUDE: Preface: 1. The colloidal state: Introduction Classification and colloidal systems Structural characteristics Preparation and purification of colloidal systems: 2. Kinetic properties: The motion of particles in liquid media Brownian motion and translational diffusion The ultracentrifuge Osmotic pressure Rotary Brownian motion: 3. Optical properties: Optical and electron microscopy Light scattering: 4. Liquid-gas and liquid-liquid interfaces Surface and interfacial tensions Adsorption and orientation at interfaces Association colloids-micelle formation spreading Monomolecular films: 5. The solid-gas interface: Adsorption of gases and vapours on solids Composition and structure of solid surfaces: 6. The solid-liquid interface Contact angles and wetting Ore flotation Detergency Adsorption from solution: 7. Charged interfaces: The electric double layer Electrokinetic phenomena Electrokinetic theory: 8. Colloid stability: Lyophobic sols Systems containing lyophilic material Stability control: 9. Rheology: Introduction Viscosity Non-Newtonian flow Viscoelasticity: 10. Emulsions and foams: Oil-in-water and water-in-oil emulsions Foams: Problems Answers References Index.

Ac electrokinetics: a review of forces in microelectrode structures

Abstract: Ac electrokinetics is concerned with the study of the movement and behaviour of particles in suspension when they are subjected to ac electrical fields. The development of new microfabricated electrode structures has meant that particles down to the size of macromolecules have been manipulated, but on this scale forces other than electrokinetic affect particles behaviour. The high electrical fields, which are required to produce sufficient force to move a particle, result in heat dissipation in the medium. This in turn produces thermal gradients, which may give rise to fluid motion through buoyancy, and electrothermal forces. In this paper, the frequency dependency and magnitude of electrothermally induced fluid flow are discussed. A new type of fluid flow is identified for low frequencies (up to 500 kHz). Our preliminary observations indicate that it has its origin in the action of a tangential electrical field on the diffuse double layer of the microfabricated electrodes. The effects of Brownian motion, diffusion and the buoyancy force are discussed in the context of the controlled manipulation of sub-micrometre particles. The orders of magnitude of the various forces experienced by a sub-micrometre latex particle in a model electrode structure are calculated. The results are compared with experiment and the relative influence of each type of force on the overall behaviour of particles is described.