An approach to estimate the position of the shear plane for colloidal particles in an electrophoresis experiment

Ding, Wuquan; Liu, Xinmin; Song, Li; Li, Qiang; Zhu, Qing; Zhu, Hongmin; Hu, Feinan; Luo, Yaxue; Zhu, Longhui; Li, Hang

doi:10.1016/j.susc.2014.08.024

Cited by 25 publications

(18 citation statements)

References 27 publications

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“…Typical materials adsorbed are ions, polyelectrolytes, ionic surfactants and macromolecules [7,8]. The spatial distribution and concentration of dissolved solutes at the membrane-solution interface is structured, resulting in the formation of an electrical double layer (EDL) [9][10][11]. The shear plane separates the stationary phase from the mobile phase of the electrical double layer and is a critical component to all models of the electrical double layer.…”

Section: Introductionmentioning

confidence: 99%

Laser Doppler Electrophoresis and electro-osmotic flow mapping: A novel methodology for the determination of membrane surface zeta potential

Thomas

Aani

Oatley-Radcliffe

et al. 2017

Journal of Membrane Science

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Section: Introductionmentioning

confidence: 99%

Laser Doppler Electrophoresis and electro-osmotic flow mapping: A novel methodology for the determination of membrane surface zeta potential

Thomas

Aani

Oatley-Radcliffe

et al. 2017

Journal of Membrane Science

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“…However, the zeta potential of BSCs in Mg 2+ was higher than that in Ca 2+ for most electrolyte concentrations, although they have the same ionic valence. Further, the zeta potential is the shear plane potential of the charged colloid, and the distance of the shear plane from the surface in a monovalent cation solution is much greater than that in a divalent cation solution at the same zeta potential 50 . Several studies show that zeta potential is approximately 3.1–6.0 times lower than the surface potential (potential at the original plane of diffusion layer) 50 .…”

Section: Resultsmentioning

confidence: 99%

“…Further, the zeta potential is the shear plane potential of the charged colloid, and the distance of the shear plane from the surface in a monovalent cation solution is much greater than that in a divalent cation solution at the same zeta potential 50 . Several studies show that zeta potential is approximately 3.1–6.0 times lower than the surface potential (potential at the original plane of diffusion layer) 50 . The effect of ions on particle surface properties is more easily reflected on the surface potential rather than on the zeta potential.…”

Section: Resultsmentioning

confidence: 99%

Quantitative characterization of non-DLVO factors in the aggregation of black soil colloids

Gao

Kou

Ren

et al. 2022

Sci Rep

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The variable role and fate of soil colloids under different environmental conditions are derived from their dispersion and aggregation properties. In this work, dynamic and static light scattering were used to characterize the original size, aggregation kinetics of natural black soil colloids (BSCs) and structural features of aggregates in electrolytes with different cations (K+, Mg2+, Ca2+), respectively. For these three cations, the aggregation kinetics followed the trend of Ca2+ > Mg2+ > K+ and the critical coagulation concentration (CCC) followed the sequence: K+ (134.30 mmol L−1) > Mg2+ (13.27 mmol L−1) > Ca2+ (4.19 mmol L−1). The results indicated that the aggregation behavior in different valence cation systems followed the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) model qualitatively. However, the quantitative differences of CCC suggest the existence of ion-specific effects. The effective ionic charge coefficient 1.31, 2.20, and 2.78 of K+, Mg2+ and Ca2+ were proposed to consider of all the non-DLVO factors, which were obtained by forming a relationship based on mathematic between the electrostatic repulsion and the van der Waals attractive interaction at the CCC. The non-classical polarization of cations in a strong soil electric field is a primary mechanism of cation effects on soil colloid interactions, causing the difference in colloid interaction energy and further affecting soil colloid aggregation. This result is crucial for enriching the theory of charged colloidal interactions.

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“…At present, the electric double layer thickness on the surface of particles can be approximately calculated by Debye parameter 1/κ, but this parameter only reflects the influence of the change in solution concentration and does not reflect the influence of the change in surface potential of particles caused by ion exchange. Ding proposed that the sliding layer thickness could be used to describe the electric double layer on the surface of particles [23]. erefore, this section describes the method for calculating the sliding layer thickness in the double layer on the particle surface, which considers the influence of solution concentration and particle surface potential on the double layer thickness on the particle surface.…”

Section: Ickness Of the Sliding Layer In Electric Double Layermentioning

confidence: 99%

Effects of Concentration of Pore Solution on Stability of Ion‐Absorbed Rare Earth Ore Aggregate

Wang

Hong

2021

Advances in Civil Engineering

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The continuous change in solution concentration in ore pores during in situ mineral leaching influences the stability of ore aggregate. In this study, influences of the concentration of ammonium sulfate ((NH4)2SO4) solution on the interaction forces between ore particles were calculated. On this basis, the mechanism by which (NH4)2SO4 solution concentration influences the stability of ore aggregate was analyzed. Furthermore, an empirical formula for estimating the critical (NH4)2SO4 solution concentration for aggregation and dispersion of ore body aggregates with different grain composition was proposed. Some major conclusions were drawn. First, for ore bodies with an initial particle size of less than 0.075 mm, the interaction force between particles was net attraction, with the distance range of this force increasing as the concentration of (NH4)2SO4 solution increased from ≤0.001 to 0.16 mol·L−1, aggregation of ore particles occurring within this distance range. Secondly, for ore bodies with initial particle size of less than 0.075 mm, the interaction force between particles was net attraction, but with the distance range of this force decreasing when the (NH4)2SO4 solution concentration increased from 0.16 to 0.28 mol·L−1, dispersion of ore particles occurring beyond this distance range. Thirdly, for ore bodies with particle sizes of less than 0.038, 0.075 and 0.1 mm, the cation exchange capacity (CEC) was 9.13, 8.96, and 8.8 cmol·kg−1, respectively, and the critical (NH4)2SO4 solution concentration affecting the aggregation and dispersion of ore bodies was 0.12, 0.16, and 0.20 mol·L−1, respectively.

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An approach to estimate the position of the shear plane for colloidal particles in an electrophoresis experiment

Cited by 25 publications

References 27 publications

Laser Doppler Electrophoresis and electro-osmotic flow mapping: A novel methodology for the determination of membrane surface zeta potential

Laser Doppler Electrophoresis and electro-osmotic flow mapping: A novel methodology for the determination of membrane surface zeta potential

Quantitative characterization of non-DLVO factors in the aggregation of black soil colloids

Effects of Concentration of Pore Solution on Stability of Ion‐Absorbed Rare Earth Ore Aggregate

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