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Colloid science / Ionophoresis / The kinetic theory of the ionophoresis of colloids

The kinetic theory of the ionophoresis of colloids

Shilov V. N., Zharkikh N. I., Borkovskaya Yu. B.

Discussed is the application of the principle of the local equilibrium to the theory of electrokinetic phenomena. The simplifications entered by the consecutive application of that principle in the initial system of Stokes, Nernst-Planck and Poisson Boltzmann equations, are not connected with any approximations, since these equations are not based on the local equilibrium. The expression for the volume force in the Stokes equation has been reduced to the form which is symmetrical with regard to the gradients of potential and the electrolyte concentration (it is also expressed through the gradients of the chemical potentials of separate ionic components). Thus1, the essential equality between the electric and concentration effects on a double electric layer has been proved, the equality which is observed, not only on the level of the effects discussed, but also on the level of the starting equations of theory. Discussed is the physical cause of the diffusion force (the volume force acting within the range of the double electric layer, and proportional to the concentration gradient). It has been indicated that the physical cause is attributable to the attraction of a disperse particle to the molecules or ions adsorbed on its surface. Using the concept of diffusion forces as the basis, one discusses the qualitative picture of diffusionphoresis and ionophorfcsis.

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Colloid and water chemistry institite, Academy of sciences of Ukraine, Kyiv

Received 19 Jan 1984

Published : Colloid Journal (Moscow), 1985, v. 47, 5, p. 927 935.

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