Asymmetrical Polarization of Spherical Colloidal Particle Double Layer in Electrical Fields PDF Download
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Languages : en
Pages :
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Author:
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Languages : en
Pages :
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Author: F.E. Filisko
Publisher: Springer Science & Business Media
ISBN: 1489910360
Category : Science
Languages : en
Pages : 367
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Book Description
This treatise is a compendium of refereed papers based on invited talks presented at the American Chemical Society Symposium on Electrorheological (ER) Materials and Fluids. ER fluids were first investigated 50+ years ago. These fluids, which change rheology when placed in an electric field, were recognized, from the beginning, for allowing an extremely efficient interface between electrical control and mechanical devices. Critical problems, however, existed with the initial fluids, which prevented them from serious consideration for large-scale applications. While over time some of the critical problems have been solved and activity in ER technology has increased, commercial success has remained elusive. A recent Department of Energy report concluded that a primary reason for the failure to commercialize this promising technology is due to a lack in understanding the physics and chemistry of how the materials work. The goal of the symposium was to address the issue of understanding how ER materials work and how they can be used. One of the outcomes of the symposium, which we hope is conveyed in this book, is a feeling that if the mechanism of ER is to be fully understood and improved, expertise from diverse fields must be applied to the problem.
Author: Jingyu Wang
Publisher:
ISBN: 9781267708328
Category :
Languages : en
Pages : 122
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Book Description
AC electrokinetic forces experienced by polarizable colloidal particles in liquid suspensions, such as dielectrophoresis (DEP) and AC electroosmosis (ACEO), have been widely investigated for the purpose of transporting, sorting and positioning samples in microfluidic devices. However, independent studies of DEP and ACEO were impeded by the fact that the two mechanisms can both occur in the same experimental/application environment. To provide a more complete theoretical basis for the electrical polarizability of colloidal particles, and their interaction with the external electric field, we propose an isolation technique based on optical tweezers-based force spectroscopy and lock-in phase sensitive detection. This method extracts individual contributions from ACEO and DEP on a single spherical probe particle. From there we examined the relaxation process of a polarized particle with its associated electrical double layer in DEP. We also obtained an unambiguous velocity field of ACEO, mapped by a group of different-sized probes. We extended our studies to electrically polarized rod-shaped particles. We focused on a specific type of rod of great academic and industrial interest, single-walled carbon nanotubes (SWCNT), and studied their migration and orientation at optical frequencies.
Author: Eric Lee
Publisher: Academic Press
ISBN: 0128052651
Category : Science
Languages : en
Pages : 436
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Book Description
Theory of Electrophoresis and Diffusiophoresis of Highly Charged Colloidal Particles discusses the electrophoretic and diffusiophoretic motions of various colloidal entities, such as rigid particles, liquid droplets, gas bubbles, and porous particles, focusing on the motion-deterring double-layer polarization effect pertinent to highly charged particles, with the lowly charged ones serving as the limiting cases. Boundary effects such as those from a cylindrical pore, a solid plane, or an air-water interface are analyzed as well for the electrophoretic motion of the various particles considered. Dynamic electrophoresis is also explored and treated. The contents are suitable for researchers, graduate students, or senior college students with some basic background of colloid science and transport phenomena. As there is no closed-form analytical formula in general for the situation of highly charged particles, the results are presented with extensive figures and plots as well as tables under various electrokinetic situations of interest to facilitate the possible use of interested readers. Provides a reliable quantitative prediction of highly charged particles motion with easy-to-apply charts and in-depth understanding of the underlying mechanisms Offers an extensive treatment of direct quantitative predication for non-rigid systems, such as porous particles, liquid drops, and gels, which is especially valuable in proteins and DNA research Discusses highly charged systems with a nearby boundary of practical interests, such as a pore, a solid plane, or an air-water interface, which is of vital interest in fields such as microfluidic operations and biomedical engineering Affords special attention to the polarization effect
Author: Alberto Fernandez-Nieves
Publisher: John Wiley & Sons
ISBN: 111806562X
Category : Technology & Engineering
Languages : en
Pages : 444
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Book Description
This book presents a compilation of self-contained chapters covering a wide range of topics within the broad field of soft condensed matter. Each chapter starts with basic definitions to bring the reader up-to-date on the topic at hand, describing how to use fluid flows to generate soft materials of high value either for applications or for basic research. Coverage includes topics related to colloidal suspensions and soft materials and how they differ in behavior, along with a roadmap for researchers on how to use soft materials to study relevant physics questions related to geometrical frustration.
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Category : Power resources
Languages : en
Pages : 896
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Book Description
Author: P. Somasundaran
Publisher: CRC Press
ISBN: 9780849396069
Category : Science
Languages : en
Pages : 1000
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Book Description
Author: William Bailey Russel
Publisher: Cambridge University Press
ISBN: 9780521426008
Category : Mathematics
Languages : en
Pages : 548
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Book Description
This book covers the physical side of colloidal science from the individual forces acting between particles smaller than a micrometer that are suspended in a liquid, through the resulting equilibrium and dynamic properties. A variety of internal forces both attractive and repulsive act in conjunction with Brownian motion and the balance between them all decides the phase behaviour. On top of this various external fields, such as gravity or electromagnetic fields, diffusion and non-Newtonian rheology produce complex effects, each of which is of important scientific and technological interest. The authors aim to impart a sound, quantitative understanding based on fundamental theory and experiments with well-characterised model systems. This broad grasp of the fundamentals lends insight and helps to develop the intuitive sense needed to isolate essential features of the technological problems and design critical experiments. The main prerequisites for understanding the book are basic fluid mechanics, statistical mechanics and electromagnetism, though self contained reviews of each subject are provided at appropriate points. Some facility with differential equations is also necessary. Exercises are included at the end of each chapter, making the work suitable as a textbook for graduate courses in chemical engineering or applied mathematics. It will also be useful as a reference for individuals in academia or industry undertaking research in colloid science.
Author: A. Leitmannova Liu
Publisher: Elsevier
ISBN: 0080462006
Category : Technology & Engineering
Languages : en
Pages : 337
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Book Description
The lipid bilayer is central to life, as all living organisms possess a lipid bilayer structure, thereby underlying the lipid bilayer principle of biomembranes. The lipid bilayer principle and its applications are the main theme of this new book series.This new series on bilayer lipid membranes (BLMs and liposomes) include invited chapters on a broad range of topics, from theoretical investigations, specific studies, experimental methods, to practical applications. Written for newcomers, experienced scientists, and those who are not familiar with these specific research areas, the Series covers all aspects of lipid bilayer investigations, both fundamental and applied. * Covers a broad range of topics ranging from theoretical research, specific studies, experimental methods, to practical applications* Authoritative timely reviews by experts in this field* Indispensable source of information for new scientists
Author: Jyh-Ping Hsu
Publisher: CRC Press
ISBN: 9781439803530
Category : Science
Languages : en
Pages : 194
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Book Description
In the 20 years since the pilot plant experiments used to develop the concept of electroviscoelasticity, inroads have been made in the understanding of its many related processes. Interfacial Electroviscoelasticity and Electrophoresis meets a massive scientific challenge by presenting deeper research and developments in the basic and applied science and engineering of finely dispersed particles and related systems. Introducing more profound and in-depth treatises related to the liquid-liquid finely dispersed systems (i.e., emulsions and double emulsions), this book describes a new theory developed through the authors’ work. These findings are likely to impact other research and applications in a wide array of other fields, considering that the modeling of liquid-liquid interfaces is key to numerous chemical manufacturing processes, including those used for emulsions, suspensions, nanopowders, foams, biocolloids, and plasmas. The authors cover phenomena at the micro, nano, and atto-scales, and their techniques, theory, and supporting data will be of particular interest to nanoscientists, especially with regard to the breaking of emulsions. This groundbreaking book: Takes an interdisciplinary approach to elucidate the momentum transfer and electron transfer phenomena Covers less classical chemical engineering insight and modern molecular and atomic engineering Reviews basic theory of electrokinetics, using the electrophoresis of rigid particles as an example Built around the central themes of hydrodynamic, electrodynamic, and thermodynamic instabilities that occur at interfaces, this book addresses recently developed concepts in the physics, chemistry, and rheological properties of those well-studied interfaces of rigid and deformable particles in homo- and hetero-aggregate dispersed systems. The book also introduces the key phenomenon of electrophoresis, since it is widely adopted either as an analytical tool to characterize the surface properties of colloid-sized particles or in the separation and purification process of both laboratory and industrial scales. The applications and implications of the material presented in the book represent a major contribution to the advanced fundamental, applied, and engineering research of interfacial and colloidal phenomena.
