title: Universal electro-osmosis formulae for porous media.
abstract: Approximate analytical formulae valid for any porous media with elongated pores are derived for the electro-osmotic coefficient alpha and for the average ionic concentration n . A macroscopic Debye-Hückel length kappa (-)(-1) based on n is introduced. Simultaneously, the electro-osmotic coefficient alpha is systematically calculated for various media, zeta potentials and electrolyte concentrations by solving the local equations. Numerical results show that kappa (-)(-1) and alpha follow universal curves valid whatever the porous medium; these curves can be approximated by the analytical formulae previously derived. These formulae can be used to provide a priori estimates of the electro-osmotic coefficient.
authors.affiliation: UPMC-Sisyphe, 4 Place Jussieu, 75252 Paris cedex 05, France.
authors.forename: A
authors.initials: A
authors.lastname: Gupta
authors.forename: D
authors.initials: D
authors.lastname: Coelho
authors.forename: P M
authors.initials: PM
authors.lastname: Adler