Measurement and interpretation of electrokinetic phenomena

Delgado, A.V.; González‐Caballero, F.; Hunter, Robert J.; Koopal, L.K.; Lyklema, J.

doi:10.1016/j.jcis.2006.12.075

Cited by 1,041 publications

(876 citation statements)

References 124 publications

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“…The zeta potential is the electrical potential located at the shear plane [18,19]. Water flow also drags the excess counter-ions in the diffuse layer along the pores surface and creates a macroscopic current density, the streaming current and a macroscopic electrical potential difference, the streaming potential [14,17]. The electrical field induced by the streaming potential is responsible for conduction currents in the bulk pore water and in the EDL.…”

Section: Streaming Potential Modelmentioning

confidence: 99%

“…A shear plane at the particles surface and a macroscopic electrical potential difference, the so-called streaming potential, appear during streaming potential experiments [16,17]. The streaming potential method gives information on the electrical potential at the shear plane, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…The streaming potential method gives information on the electrical potential at the shear plane, i.e. on the zeta potential if conduction and streaming currents are correctly described [17,18]. The zeta potential can be used to constrain the parameters (sorption equilibrium constants, capacitance(s)) of the electrostatic surface complexation model [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Streaming potential induces electromigration currents in the EDL at the surface of the particles, which are responsible for surface conductivity [17,18]. Surface conductivity increases conduction current opposed to streaming current and hence decreases the magnitude of the streaming potential [17,19]. Inertial laminar flow decreases the apparent permeability, water flow in the pores and the resulting streaming potential [16,21].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Streaming Potential Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Pragmatically, the EDL is subdivided into the immobile Stern layer (SL) and the surrounding diffuse layer (DL). As the surface charge density is difficult to measure, the EDL is often characterized by the zeta potential ζ , which is more relevant for practice and easier to determine, e.g., by analyzing the electrokinetic effects [3,5]. The latter are described by cross coefficients in the electrohydrodynamic transport equations, which relate the volumetric flowV and electric current I to the difference of the pressure p and the electric potential Ψ Ext :…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Physicochemical influences on electrohydrodynamic transport in compressible packed beds of colloidal boehmite particles

Schäfer

Nirschl

2008

Journal of Colloid and Interface Science

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Production and processing of colloidal particles require a deeper understanding of the surface charge of particles and the interaction of mass and charge transport in packed beds. The assessment of fundamental parameters is rather complex due to the additional influence of the particle charge on the structure of a packed bed. The combination of different measurement techniques (streaming potential and electroosmosis) allows for separating the effects, based on the postulation of a new method to quantify the ratio of surface conductance to liquid conductance. The purpose of this paper is to investigate the influence of pH value and compression on the electrohydrodynamic transport parameters.

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Electrophoretic NMR

Scheler

2012

Encyclopedia of Magnetic Resonance

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Measurement and interpretation of electrokinetic phenomena

Cited by 1,041 publications

References 124 publications

Influence of surface conductivity on the apparent zeta potential of calcite

Influence of surface conductivity on the apparent zeta potential of calcite

Physicochemical influences on electrohydrodynamic transport in compressible packed beds of colloidal boehmite particles

Electrophoretic NMR

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