The electrophoretic mobility of montmorillonite. Zeta potential and surface conductivity effects

Leroy, Philippe; Tournassat, Christophe; Bernard, Olivier; Devau, Nicolas; Azaroual, Mohamed

doi:10.1016/j.jcis.2015.03.047

Cited by 75 publications

(83 citation statements)

References 96 publications

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“…13) and electro-osmosis (second term of eq. 13) (Bikerman 1940;Revil & Glover 1997;Heuser et al 2012;Leroy et al 2015). Because the diffuse layer is far (severalÅ) from the mineral surface and contains mostly counter-ions slowing down slightly counter-ions electromigration compared to co-ions (Bernard et al 1992), we assume that the ion mobility in the diffuse layer is similar to the ion mobility in the bulk water, that is β d i ≈ β w i (Lyklema & Minor 1998;Leroy et al 2008;).…”

Section: The New Surface Conductivity Modelmentioning

confidence: 99%

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Modeling the evolution of complex conductivity during calcite precipitation on glass beads

Leroy

Li²,

Jougnot

et al. 2017

Geophys. J. Int.

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S U M M A R YWhen pH and alkalinity increase, calcite frequently precipitates and hence modifies the petrophysical properties of porous media. The complex conductivity method can be used to directly monitor calcite precipitation in porous media because it is sensitive to the evolution of the mineralogy, pore structure and its connectivity. We have developed a mechanistic grain polarization model considering the electrochemical polarization of the Stern and diffuse layers surrounding calcite particles. Our complex conductivity model depends on the surface charge density of the Stern layer and on the electrical potential at the onset of the diffuse layer, which are computed using a basic Stern model of the calcite/water interface. The complex conductivity measurements of Wu et al. on a column packed with glass beads where calcite precipitation occurs are reproduced by our surface complexation and complex conductivity models. The evolution of the size and shape of calcite particles during the calcite precipitation experiment is estimated by our complex conductivity model. At the early stage of the calcite precipitation experiment, modelled particles sizes increase and calcite particles flatten with time because calcite crystals nucleate at the surface of glass beads and grow into larger calcite grains. At the later stage of the calcite precipitation experiment, modelled sizes and cementation exponents of calcite particles decrease with time because large calcite grains aggregate over multiple glass beads and only small calcite crystals polarize.

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Section: The New Surface Conductivity Modelmentioning

confidence: 99%

“…The Poisson-Boltzmann equation, which describes the electrical potential distribution at the solid/water or water/gas interface is (Hunter 1981;Lyklema 1995;Leroy et al 2015):…”

Section: A P P E N D I X Bmentioning

confidence: 99%

Modeling the evolution of complex conductivity during calcite precipitation on glass beads

Leroy

Li²,

Jougnot

et al. 2017

Geophys. J. Int.

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“…1,2 Electric interactions are recognized as molecule-molecule interactions or the interaction between molecules and a static electric field, which can be induced by external sources or uneven distribution of interfacial ionic species, for example, the electric double layers at interfaces. 3 In order to understand the behavior of ions at interfaces, experimental techniques such as chemical titration, 4,5 surface tension, 6,7 surface/interface potential, [8][9][10] Brewster angle microscopy, 8,11,12 electron paramagnetic resonance spectroscopy, 13 neutron reflection 14 and second order nonlinear spectroscopic methods 4,7,[15][16][17][18][19][20][21] have been applied.…”

Section: Introductionmentioning

confidence: 99%

“…It has been generally accepted that the electric charge at the interfaces can be relatively easily estimated from the zeta potential by electrophoretic mobility 10,[22][23][24][25][26] or electroacoustics 5,27 measurements with colloids/emulsions, or by measuring the streaming current/potential of interfaces. 9 From the known Gouy-Chapman theory and the Graham equation, 3,28 …”

Section: Introductionmentioning

confidence: 99%

“…However, the existence of an anomalous maximum in the ionic strength dependent electrophoretic mobility curves has been reported. 10,[22][23][24]26,[29][30][31] Because the zeta potential at a particle surface was generally treated to be proportional to the electrophoretic mobility of the particle based on the Henry equation (see Section II), 32,33 this maximum in the electrophoretic mobility curves was taken as an anomalous trend in the zeta potential curves and has been discussed in many experimental or theoretical reports. [22][23][24]26,[29][30][31]34,35 So far there have been mainly three interpretations for this observation, including specific ionic adsorption at the interfaces, 22,26,30,35 a hairy layer at the surface with surfactants or macromolecules 24,26,31,34,35 and the effect of the anomalous change of surface conductivity.…”

Section: Introductionmentioning

confidence: 99%

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The ionic strength dependent zeta potential at the surface of hexadecane droplets in water and the corresponding interfacial adsorption of surfactants

Yang

Chen

et al. 2017

Soft Matter

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An anomalous maximum in the ionic strength dependent electrophoretic mobility curves has been observed in previous reports from particles dispersed in colloids. This maximum has been considered anomalous because it is contradictory with the Gouy-Chapman model. The existence of such a maximum has been attributed to specific ionic adsorption, a hairy layer at the surface, or the effect of the anomalous change of surface conductivity in different studies. It was also pointed out that the O'Brien-White approach based on the Gouy-Chapman model could be used to understand this maximum in electrophoretic mobility curves and lead to understandable zeta potential curves. This implied that the observed maximum was actually not "anomalous". In this work we report our simulation of ionic strength dependent zeta potential curves based on the O'Brien-White approach and experimental studies of the ionic strength dependent electrophoretic mobility of the hexadecane droplets in the hexadecane-water emulsions at different pH or in the presence of sodium dodecyl sulphate at varied concentrations. In some cases, the simulation shows that the calculation with the O'Brien-White approach does change the trend in the concerned ionic strength dependent curves. However, the simulation in some other cases also leads to similar trends in the ionic strength dependent electrophoretic mobility curves and zeta potential curves. In the experiments, both the existence and non-existence of such a maximum were observed and demonstrated to be system dependent. The corresponding molecular structure of the oil-water interface was then discussed with the analyses of the zeta potential curves and second harmonic generation signals recorded at the hexadecane-water interface.

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Spectral induced polarization characterization of non-consolidated clays for varying salinities - an experimental study

Mendieta¹,

Jougnot²,

Leroy³

et al. 2021

Preprint

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The electrophoretic mobility of montmorillonite. Zeta potential and surface conductivity effects

Cited by 75 publications

References 96 publications

Modeling the evolution of complex conductivity during calcite precipitation on glass beads

Modeling the evolution of complex conductivity during calcite precipitation on glass beads

The ionic strength dependent zeta potential at the surface of hexadecane droplets in water and the corresponding interfacial adsorption of surfactants

Spectral induced polarization characterization of non-consolidated clays for varying salinities - an experimental study

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