Electrophoresis of a Concentrated Spherical Dispersion at Arbitrary Electrical Potentials

Lin, Wen-Hsun; Lee, Eric; Hsu, Jyh‐Ping

doi:10.1006/jcis.2002.8231

Cited by 9 publications

(6 citation statements)

References 16 publications

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“…ss ss e y kT i ii (15) Boundary conditions for this equation come, first of all, from the non-slip condition ( 0)…”

Section: D) Navier-stokesmentioning

confidence: 99%

“…Unlike dilute suspensions, for which successful theoretical models have been derived [1][2][3][4][5], for concentrated ones the analysis is complicated by the existence of important electro-hydrodynamic particleparticle interactions, very difficult to manage from the theoretical point of view. To overcome these limitations, some macroscopic (i.e., continuum-) descriptions have been developed that consider interactions in an average sense by mean field approaches [6][7][8][9][10][11][12][13][14][15][16][17]. Other macroscopic descriptions also account for ionic excluded volume effects, in very good agreement with Monte Carlo simulations considering explicitly the study of particle-ion or ion-ion correlations [18][19][20][21][22][23][24], mainly in equilibrium.…”

Section: Introductionmentioning

confidence: 99%

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Recent developments in electrokinetics of salt-free concentrated suspensions

Delgado

Carrique

Roa

2016

Current Opinion in Colloid & Interface Science

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“…ss ss e y kT i ii (15) Boundary conditions for this equation come, first of all, from the non-slip condition ( 0)…”

Section: D) Navier-stokesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent developments in electrokinetics of salt-free concentrated suspensions

Delgado

Carrique

Roa

2016

Current Opinion in Colloid & Interface Science

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“…The effects of overlapping of nearby double layers and appreciable doublelayer polarization are included in their model. Lin et al 15 extended the study of Lee et al 13 to the case where the strength of the applied electric field is arbitrary.…”

Section: Introductionmentioning

confidence: 99%

Influence of Double-Layer Overlap on the Electrophoretic Mobility and DC Conductivity of a Concentrated Suspension of Spherical Particles

et al. 2003

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In this paper, the specific effect of the overlapping of electrical double layers on the electrophoretic mobility and the electrical (DC) conductivity of concentrated suspensions of spherical colloidal particles is considered. Previous work has dealt with the study of such physical quantities for general conditions, including arbitrary zeta potentials, particle volume fractions, double-layer thicknesses (overlapping of double layers was allowed), and ionic properties of the solution. However, the large number of variables involved screened to some extent the specific role and, in many cases, the extraordinary magnitude of the overlapping contribution by itself. This is the reason that we are concerned here with the analysis of the latter effect in more detail. Thus, we present an extensive set of numerical data of both the electrophoretic mobility and the electrical conductivity versus the zeta potential and particle volume fraction for different electrolyte concentrations, specially in the region where overlapping effects are more relevant. Numerical results corresponding to the same theoretical conditions but where the overlapping correction is neglected are also shown for comparison. The treatment is based on the use of a cell model to account for hydrodynamic and electrical interactions between particles. The results show that neglecting double-layer overlapping corrections leads in most cases to an important underestimation of the true values of both the electrophoretic mobility and the electrical conductivity. The differences between both treatments are more pronounced the larger the double layer thickness and/or particle volume fraction are. Concerning DC conductivity, the overlap of double layers might help in interpreting discrepancies generally found between experimental data and standard theoretical values, even in suspensions with particle volume fractions that are typically considered to be dilute.

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“…Further stimulated by the increased number and potential of applications in the physical and life sciences, a generalized and refined description of electrokinetic phenomena, particularly EO and EP, either for isolated (usually spherical and hard) particles or in multiparticle systems, has received much attention over the past decades. − Addressed issues include the magnitude and distribution of surface charge and electrokinetic potential, the ratio of the particle diameter to the EDL thickness, particle polydispersity, EDL polarization and surface conductivity, particle volume fraction or, vice versa, the interparticle porosity, spatial distribution of particles (periodic arrays vs random structures), Stern layer dynamics, particle−particle interaction and an EDL overlap, adsorption effects, as well as properties of the electrolyte solution like mobility, valency, and concentration of ionic species. Assumptions inherent to the popular hard-sphere models are that the particles are essentially impermeable (nonporous) and nonconducting.…”

Section: Introductionmentioning

confidence: 99%

Effect of Intraparticle Porosity and Double Layer Overlap on Electrokinetic Mobility in Multiparticle Systems

and

Tallarek

2003

Langmuir

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We have performed a systematic experimental study of electrokinetic mobility depending on the mobile phase ionic strength (concentration of Tris buffer) using different, well-defined porous and, for reference behavior, nonporous silica-based spherical microparticles. Effects of both an intraparticle electrical double layer overlap and the porosity on electrophoretic mobility in dilute suspensions and electroosmotic mobility in fixed beds of the devised (non)porous particles were investigated. The electrokinetically consistent results demonstrate a substantially different behavior for the porous (i.e., permeable and conducting) particles with respect to nonporous (solid) spheres. It may be related to a porous particle's dipole coefficient via the intraparticle void volume and, strongly depending on mobile phase ionic strength, to the actual magnitude of electroosmotic flow jetted through a particle's interior. In contrast to the normal electrical double layer behavior observed for the solid spheres (continuous decrease of mobility with ionic strength), these competitive contributions give rise to pronounced maxima in the mobility of the porous spheres. Our results are in qualitative agreement with the theoretical analysis of Miller et al. [J. Colloid Interface Sci. 1992, 153, 237] which, depending on the double layer interaction within a porous aggregate of solid spheres, predicts (significantly) lower or higher mobilities with respect to an impermeable and nonconducting particle.

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Electrophoresis of a Concentrated Spherical Dispersion at Arbitrary Electrical Potentials

Cited by 9 publications

References 16 publications

Recent developments in electrokinetics of salt-free concentrated suspensions

Recent developments in electrokinetics of salt-free concentrated suspensions

Influence of Double-Layer Overlap on the Electrophoretic Mobility and DC Conductivity of a Concentrated Suspension of Spherical Particles

Effect of Intraparticle Porosity and Double Layer Overlap on Electrokinetic Mobility in Multiparticle Systems

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