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Dukhin number is dimensionless quantity that characterizes contribution of the surface conductivity to various electrokinetic and electroacoustic effects, as well as to conductivity and permittivity of fluid heterogeneous systems.
Additional recommended knowledge
It was introduced by Lyklema in “Fundamentals of Interface and Colloid Science” .
IUPAC Technical Report  prepared by a group of most known world experts on this subject uses this term explicitly.
Dukhin number is a ratio of the surface conductivity:κσ to the fluid bulk electric conductivity Km multiplied by particle size a ::
There is another expression of this number that is valid when surface conductivity is associated only with ions motion above slipping plane in the Double Layer. In this case, value of the surface conductivity depends on ζ-potential, which leads to the following expression for the Dukhin number for symmetrical electrolyte with equal ions diffusion coefficient:
where parameter m characyterizes contribution of electro-osmosis into motion of ions within DL:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Dukhin_number". A list of authors is available in Wikipedia.|