Electroosmotic flow of a general electrolyte solution through a fibrous medium
Journal
Journal of Colloid and Interface Science
Journal Volume
223
Journal Issue
2
Pages
223-228
Date Issued
2000
Author(s)
Abstract
The electroosmotic flow of a general electrolyte solution through a fibrous medium is modeled theoretically taking the effect of double-layer polarization into account. The result obtained is applicable to an arbitrary level of electrical potential. We show that if the effect of double-layer polarization is neglected using the linearized Poisson-Boltzmann equation will underestimate electroosmotic velocity. The deviation becomes inappreciable, however, if £ea is either very large or very small, £e and a being, respectively, the reciprocal Debye length and the radius of a fiber. If the surface potential is high, the variation of electroosmotic velocity as a function of £ea may exhibit a local maximum and a local minimum, and the larger the porosity of the fibrous medium the lower the level of surface potential for the local extremals to occur. If £ea is small, the effect of surface potential on the electroosmotic velocity is more significant than that of double-layer polarization, and the reverse is true if £ea is large. ? 2000 Academic Press.
Subjects
Double-layer polarization
Electrokinetic equations
Electrolyte solution
Electroosmotic flow
Fibrous medium
Type
journal article