Electrokinetic Phenomena

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electrokinetic phenomena

[i¦lek·trō·kə′ned·ik fə′näm·ə·nə]
(physical chemistry)
The phenomena associated with movement of charged particles through a continuous medium or with the movement of a continuous medium over a charged surface.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Electrokinetic Phenomena


a group of effects that are observed in disperse systems and in capillaries and that entail either the movement of one phase relative to another under the influence of an applied electric field or the production of a potential difference in the direction of the relative movement of phases that is due to mechanical forces. Electroosmosis and electrophoresis are the electrokinetic phenomena of the first type; the production of a sedimentation potential, or the Dorn effect, and the production of a streaming potential are the electrokinetic phenomena of the second type.

Electrokinetic phenomena result from the existence, at a phase boundary, of excess charges that are grouped as two oppositely charged layers called an electrical double layer. An electric field applied in the direction parallel to a phase boundary causes the displacement of an ionic layer relative to another, resulting in the relative displacement of the phases, that is, in electroosmosis or electrophoresis. Effects that are the converse of electroosmosis or electrophoresis are similarly observed in the flow of a liquid or in the sedimentation of particles from a disperse phase. Such effects entail the relative movement of ionic layers or the spatial separation of charges in the direction in which the phases move. In other words, they entail the production of a streaming potential or the production of a sedimentation potential, respectively.

Any electrokinetic phenomenon may be used to determine the zeta potential, or electrokinetic potential, which is denoted ζ. In such a determination, the surface conductivity caused by the freely movable charges of an electrical double layer is assumed to be greater than the volume conductivity of a system.

The theory of electrokinetic phenomena, which was developed by M. Smoluchowski in 1903, establishes a linear relationship between the quantitative characteristics of such a phenomenon and those of the applied electric field. However, the theory does not take into account the departure of a double layer from equilibrium or the production of an induced dipole moment in dispersed particles. To take these effects into account, electrokinetic phenomena must be studied in conjunction with other electrical surface effects.


Dukhin, S. S. Elektroprovodnost’ i eleklrokineticheskie svoistva dispersnykh sistem. Kiev, 1975.
Dukhin, S. S., and B. V. Deriagin. Eleklroforez. Moscow, 1976.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The key parameter for electrokinetic phenomena is the Streaming Potential coupling coefficient and therefore the zeta potential [4].
Abramson, Electrokinetic Phenomena and Their Application to Biology and Medicine, ACS Monograph Series, Chemical Catalog, New York, NY, USA, 1934.
Electrokinetic phenomena, as electrokinetic (zeta) potential and specific amount of surface charge, characterize electric charge of textile material.
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.
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.
Spun-out from the University of Newcastle three years ago, Electrokinetic is developing pioneering technology of EKG which is based on harnessing the power of electrokinetic phenomena through the development of electrodes that have a range of functions over and above simply conducting electricity.
This charge manifests itself in electrokinetic phenomena, the movement of colloids in an applied external electric field.
Muzutani, "Experimental and theoretical basis of electrokinetic phenomena in rock-water systems and its applications to geophysics," Journal of Geophysical Research, vol.
Derjaguin, Electrokinetic Phenomena, John Wiley & Sons, 1974.
Coverage progresses from mathematical preliminaries through colloidal systems, electrophoresis, and numerical simulation of electrokinetic phenomena. Because the book does not require advanced mathematical knowledge, it can be used by senior undergraduate and graduate students approaching the subject for the first time.
Dresner, L., "Electrokinetic Phenomena in Charged Microcapillaries," J.