Modelling of pH-dependent electro-osmotic flows

Patrick Dangla; Teddy Fen-Chong; Fabien Gaulard

doi:10.1016/j.crme.2004.07.008

Modelling of pH-dependent electro-osmotic flows

Presented by: Évariste Sanchez-Palencia

Patrick Dangla ¹; Teddy Fen-Chong ¹ ; Fabien Gaulard ¹

¹ Laboratoire des matériaux et des structures du génie civil, LMSGC-institut Navier (UMR113 LCPC/ENPC/CNRS), 2, allée Kepler, cité Descartes, 77420 Champs sur Marne, France

Comptes Rendus. Mécanique, Volume 332 (2004) no. 11, pp. 915-920.

Abstract
Résumé

NaCl-water saturated kaolinite is observed to show pH-dependent electro-osmotic flow. This behaviour is modelled by computing the electro-osmotic flow between parallel planes as a function of their electrical surface charge density. The latter can be related to pH through the physico-chemical properties of the material. In case of kaolinite particles, isomorphic substitution and two surface dissociation reactions allow to predict the pH-dependence of the electrical charge density and thus the variations of electro-osmotic flows with pH.

On étudie l'écoulement électro-osmotique entre deux plaques en fonction de la densité de charge qu'elles portent. Par ailleurs, une modélisation des réactions de dissociation en surface du cristal de kaolinite permet de représenter la variation de cette densité de charge avec le pH. Ces résultats combinés permettent de modéliser les variations des flux électro-osmotiques avec le pH.

Received: 2004-01-05
Accepted: 2004-07-21
Published online: 2004-09-09

DOI: 10.1016/j.crme.2004.07.008

Keywords: Porous media, Electro-osmosis, Kaolinite, Colloid, Surface charge, pH
Mots-clés : Milieux poreux, Électro-osmose, Kaolinite, Colloïde, Densité de charge, pH

Author's affiliations:

Patrick Dangla ¹; Teddy Fen-Chong ¹; Fabien Gaulard ¹

¹ Laboratoire des matériaux et des structures du génie civil, LMSGC-institut Navier (UMR113 LCPC/ENPC/CNRS), 2, allée Kepler, cité Descartes, 77420 Champs sur Marne, France

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     title = {Modelling of {pH-dependent} electro-osmotic flows},
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Patrick Dangla; Teddy Fen-Chong; Fabien Gaulard. Modelling of pH-dependent electro-osmotic flows. Comptes Rendus. Mécanique, Volume 332 (2004) no. 11, pp. 915-920. doi : 10.1016/j.crme.2004.07.008. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2004.07.008/

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