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A double layer model of the gas bubble/water interface

Philippe Leroy 1, 2, * Damien Jougnot 3 André Revil 4, 5 Arnault Lassin 1, 2 Mohamed Azaroual 1, 2
* Corresponding author
1 ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
2 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
3 Institut de Géophysique
IG - Institut de Géophysique
4 Colorado School of Mines
5 ISTerre - Institut des Sciences de la Terre
Abstract : Zeta potential is a physico-chemical parameter of particular importance to describe sorption of contaminants at the surface of gas bubbles. Nevertheless, the interpretation of electrophoretic mobilities of gas bubbles is complex. This is due to the specific behavior of the gas at interface and to the excess of electrical charge at interface, which is responsible for surface conductivity. We developed a surface complexation model based on the presence of negative surface sites because the balance of accepting and donating hydrogen bonds is broken at interface. By considering protons adsorbed on these sites followed by a diffuse layer, the electrical potential at the head-end of the diffuse layer is computed and considered to be equal to the zeta potential. The predicted zeta potential values are in very good agreement with the experimental data of H2 bubbles for a broad range of pH and NaCl concentrations. This implies that the shear plane is located at the head-end of the diffuse layer, contradicting the assumption of the presence of a stagnant diffuse layer at the gas/water interface. Our model also successfully predicts the surface tension of air bubbles in a KCl solution.
Keywords : Zeta potential Gas bubble Electrical double layer Surface conductivity Proton Surface tension
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Journal articles
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https://hal-insu.archives-ouvertes.fr/insu-00782688
Contributor : Nathalie Pothier <>
Submitted on : Wednesday, January 30, 2013 - 1:59:52 PM
Last modification on : Tuesday, December 8, 2020 - 10:20:49 AM

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Philippe Leroy, Damien Jougnot, André Revil, Arnault Lassin, Mohamed Azaroual. A double layer model of the gas bubble/water interface. Journal of Colloid and Interface Science, Elsevier, 2012, 388, pp.243-256. ⟨10.1016/j.jcis.2012.07.029⟩. ⟨insu-00782688⟩

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