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Electrokinetic and Colloid Transport Phenomena.

Electrokinetic and Colloid Transport Phenomena Jacob H. Masliyah and Subir Bhattacharjee Publisher: Wiley-Interscience, 2006 ISBN: 0471799734

Publication of the book Electrokinetic and Colloid Transport Phenomena by Masliyah and Bhattacharjee reflects the growing interest in understanding the behaviour of colloidal and biological systems by graduate students and research engineers. The distinctive feature of colloidal systems is the high specific area of the interface between the continuous and dispersed phases at which electric charges can accumulate. The presence of these charges couples hydrodynamics with mass transfer and electrostatics in one distinctive field of science called electrokinetics. Electrokinetics has well-established applications in widely used separation technologies, such as reverse osmosis, and is the basis for a number of essential analytical methods. It is also commonly applied in surface characterization and process optimization in the mineral industry. However, in many cases experimental results are misinterpreted due to the lack of a solid grasp of the three broad fields of physics mentioned above.

The book provides an excellent systematic review of the physical fundamentals needed to fully understand electrokinetic phenomena, as well as a number of instructional examples that, in most cases, are taken from original scientific publications. Every subject discussed is supported by a short introduction and references to a range of well selected publications, including classical papers, even if they are 100 years old. This is a welcome departure from the trend of presenting either a small number of references to recent reviews or a massive number of references that only confuse the reader.

After a general introduction to the required mathematics in Chapter 1 and to colloidal systems in Chapter 2, Chapters 3 and 4 discuss the foundations and applications of electrostatics. The physical meaning of boundary conditions, surface charge, and electrostatic stress in dielectrics are presented systematically and supported by example problems. These two chapters constitute a self-contained course on the fundamentals of electrostatics.

Chapter 5 is a review of models of the electric double layer and the electrical interaction between two surfaces. Expressions that are often used to interpret experimental results for the force and energy of interactions between plates are derived in an easily understood manner.

A review of the basic equations governing mass and momentum transport is presented in Chapter 6. In order to provide a foundation for the discussion of electrokinetic phenomena in subsequent chapters, special attention is paid to mass transfer in multicomponent systems containing ions and colloidal particles.

The four most commonly studied electrokinetic phenomena--electroosmosis, streaming potential, electrophoresis, and sedimentation potential--are listed in Chapter 7. Electroosmosis and streaming potential are described in detail in the following chapter, which is devoted to flow in a microchannel. This system is simple enough that many analytical solutions can be found and used for educational purposes. Chapters 9 and 10 deal with electrophoresis and sedimentation potential, respectively. Here special consideration is given to models applicable for high surface potentials and corrections for finite concentrations of particles.

In order to analyze coagulation and deposition kinetics in a colloidal system, more complete models of particle interactions are required. Chapter 11 first presents models of London-van der Waals forces, proceeds to explain DLVO theory, and concludes by briefly introducing other interactions that can be included in an extended DLVO theory. The following two chapters deal with the kinetics of coagulation and deposition of colloidal particles. Taking into account that these subjects are usually considered to be areas of colloidal science not necessarily closely associated with electrokinetics, the review is very thorough and systematic.

The last two chapters of the book give examples of numerical simulations of electrokinetic phenomena and some selected applications of electrokinetic transport, mainly in industrial systems.

The book is very well written and uses clear, consistent language. It has a fair number of mathematical formulas, but all basic equations are derived in a systematic way that is easy to follow. The book therefore has substantial classroom educational value. It also serves as a thorough reference for professionals in the fields of electrokinetics and colloidal science.

Tadeusz Dabros

CETC-Devon
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Author:Dabros, Tadeusz
Publication:Canadian Journal of Chemical Engineering
Article Type:Book review
Date:Oct 1, 2006
Words:669
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