On surface conduction and its role in electrokinetics

Lyklema, J.; Minor, Marcel

doi:10.1016/s0927-7757(97)00266-5

Cited by 175 publications

(171 citation statements)

References 18 publications

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“…(13) and (14) ting the mobility of the ions to their bulk value, this gives a charge density in the Stern layer of 1.3 µC/cm 2 , similar to that measured by Minor et al [41,42] for sulphate latex at 1.61 µC/cm 2 . Lyklema and Minor [31] calculated the diffuse layer charge density of plugs of 800 nm diameter sulphated polystyrene. They estimated ρ q,Diff = 3.9 µC/cm 2 and a Stern charge density of ρ q,Stern = 2.4 µC/cm 2 .…”

Section: Resultsmentioning

confidence: 99%

“…The diffuse layer conductance consists of two components, one from electroosmosis caused by fluid movement beyond the shear plane K Diff,eo , and the other a conduction current caused by the movement of charge with respect to the liquid K Diff,m [31]. The diffuse layer conductance is [7,31] …”

Section: Ac Electrokinetics and Dielectrophoresismentioning

confidence: 99%

“…In this expression the additional parameter Θ reflects the contribution to the total surface conduction made by conduction behind the shear plane [7,31], given by the ratio of the Stern layer conduction to the conduction current in the diffuse layer, in the absence of electroosmosis, i.e., …”

Section: Electrokinetics: Electrophoresismentioning

confidence: 99%

“…The mobility of the ions that give rise to surface conductance behind the shear plane is unknown, but experiments have shown that it is close to that of the ions in the bulk [7,8,21,30,31]. Therefore, in order to investigate the role of the Stern layer in determining the DEP properties of particles, we also measured the dielectrophoretic cross-over data of latex particles in suspending media of different viscosities.…”

Section: Introductionmentioning

confidence: 99%

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The electrokinetic properties of latex particles: comparison of electrophoresis and dielectrophoresis

Ermolina

Morgan

2005

Journal of Colloid and Interface Science

224

255

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A comprehensive study of the AC and DC electrokinetic properties of submicrometre latex particles as a function of particle size and suspending medium conductivity and viscosity is presented. Electrophoretic mobility and dielectrophoretic cross-over results were measured for particle diameters ranging from 44 to 2000 nm. The zeta potentials of the particles were calculated from the electrophoretic mobility data for different suspending medium conductivities, using various models, with and without the inclusion of surface conduction. The dielectrophoretic data was analysed to derive values for the Stern layer conductance and zeta potentials.  2004 Elsevier Inc. All rights reserved.

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Section: Resultsmentioning

confidence: 99%

Section: Ac Electrokinetics and Dielectrophoresismentioning

confidence: 99%

Section: Electrokinetics: Electrophoresismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The electrokinetic properties of latex particles: comparison of electrophoresis and dielectrophoresis

Ermolina

Morgan

2005

Journal of Colloid and Interface Science

224

255

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“…The specific surface conductivity is due to the electromigration (superscript "e") of charged species and the associated electro-osmotic processes (superscript "os") at the solid-water interface [18,19,36]: The specific surface conductivity can be calculated as a function of the excess of charge and ionic mobilities at the solid surface [36,49]. When calcite is in contact with an aqueous NaCl electrolyte at a given partial pressure of CO 2 (pCO 2 ), protons are adsorbed at the mineral surface, and different types of counter-ions, Na + , Ca 2+ , Cl -, − 3 HCO , and…”

Section: Electrical Conductivity Modelmentioning

confidence: 99%

Influence of surface conductivity on the apparent zeta potential of calcite

Leroy

Heberling

et al. 2016

Journal of Colloid and Interface Science

114

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Zeta potential is a physicochemical parameter of particular importance in describing the surface electrical properties of charged porous media. However, the zeta potential of calcite is still poorly known because of the difficulty to interpret streaming potential experiments. The HelmholtzSmoluchowski (HS) equation is widely used to estimate the apparent zeta potential from these experiments. However, this equation neglects the influence of surface conductivity on streaming potential. We present streaming potential and electrical conductivity measurements on a calcite powder in contact with an aqueous NaCl electrolyte. Our streaming potential model corrects the apparent zeta potential of calcite by accounting for the influence of surface conductivity and flow regime. We show that the HS equation seriously underestimates the zeta potential of calcite, particularly when the electrolyte is diluted (ionic strength ≤0.01 M) because of calcite surface conductivity. The basic Stern model successfully predicted the corrected zeta potential by assuming that the zeta potential is located at the outer Helmholtz plane, i.e. without considering a stagnant diffuse layer at the calcite-water interface. The surface conductivity of calcite crystals was inferred from electrical conductivity measurements and computed using our basic Stern model. Surface conductivity was also successfully predicted by our surface complexation model.

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