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Polarization Effects on Diffusiophoresis in Electrolyte Gradients by Yashodhara Pawar; Yuri E. Solomentsev; John L. Anderson is a Chemistry article available to read on EtoBox.

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An analysis of the effects of polarization of the double layer on the diffusiophoretic mobility of spherical, uniformly charged colloidal particles is presented. The development is based on the concepts first proposed by S. S. Dukhin and B. V. Derjaguin (in "Surface and Colloid Science" (E. Matijevic, Ed.), Vol. 7. Wiley, New York, 1974). The double layer is assumed very thin relative to the radius \((R)\) of the particle, \(\kappa R \gg 1\), where \(k\) is the Debye screening parameter, but the dimensionless zeta potential \((\mathcal{\zeta})\) is allowed to be arbitrarily large such that the parameter \(\lambda\) \(=(\kappa R)^{-1}[\exp (\xi / 2)-1]\) could be \(O(1)\). The theory is linear in the macroscopic gradient of electrolyte concentration and hence the mobility depends only on \(\xi\) and \(\lambda\). An analytical expression for this dependence is derived for the case of a symmetrically charged electrolyte. This equation is compared with results based on numerical solutions of the governing electrokinetic equations; the agreement is excellent for \(\kappa R>20\), and our analytical expression even captures the change in direction of the particle motion as \(\lambda\) inc

Who reads Polarization Effects on Diffusiophoresis in Electrolyte Gradients?

Author

Yashodhara Pawar; Yuri E. Solomentsev; John L. Anderson

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)

Published

1993

Language

EN

Field

Chemistry (Physical Sciences)