Electrokinetics of Concentrated Suspensions of Spherical Colloidal Particles with Surface Conductance, Arbitrary Zeta Potential, and Double-Layer Thickness in Static Electric Fields

Carrique, F.; Arroyo, Francisco J.; Delgado, A.V.

doi:10.1006/jcis.2002.8418

Cited by 78 publications

(94 citation statements)

References 41 publications

(87 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This was to be expected, as it is predicted by all theoretical models [1][2][3][4][5][6][7][8]12] and justified because of the hydrodynamic and electrostatic interactions of a given particle with its neighbors. In addition, increasing the frequency f can bring about two distinct behaviors in the mobility: for frequencies on the order of 2-3 MHz, * d u goes through a maximum, that occurs at higher frequencies the more concentrated the suspension.…”

Section: Dynamic Mobilitysupporting

confidence: 53%

“…Another evaluation, first carried out by Dukhin et al [2,3], is based on a so-called "cell model", that has also been successfully applied to the analysis of a variety of electrokinetic phenomena in concentrated suspensions, including electrophoresis, sedimentation potential or dielectric dispersion [4][5][6][7][8]. In this sort of calculation, the hydrodynamic and electrical interactions between particles are accounted for in an averaged form by solving the electrokinetic equations for a single spherical particle of radius a, enclosed by a spherical shell of solution of radius b, concentric with the particle.…”

Section: Manuscript Received On 27 June 2005 In Final Formmentioning

confidence: 99%

“…However, similar to previous findings regarding the comparison of permittivity and dc electrophoresis, it is clear that the electrokinetic model tends to underestimate ε'(0) and to overestimate ω α , the differences amounting to about one order of magnitude. These differences have been explained considering that the classical or standard electrokinetic model has fundamental limitations: the hypothesis that the stagnant layer (extending between the solid surface and the shear plane) is non-conducting has been revised and so-called dynamic-Stern-layer models have been elaborated that demonstrate a better quantitative agreement between different techniques [6][7][8].…”

Section: Comparison Between Both Techniquesmentioning

confidence: 99%

See 2 more Smart Citations

Electroacoustic and dielectric dispersion of concentrated colloidal suspensions

Ahualli

Jiménez

Delgado

et al. 2006

IEEE Trans. Dielect. Electr. Insul.

Self Cite

View full text Add to dashboard Cite

The determination of the permittivity of colloidal dispersions has been demonstrated to be a very useful technique to characterize the electrical state of the solid/liquid interface. This is so because of its sensitivity to such features as particle size and shape, state of aggregation, surface charge, and so on. The dielectric dispersion data are particularly suited to the evaluation of the surface characteristics when the suspension contains a high solids concentration, as in such conditions the usual electrokinetic techniques linked to optical methods are not applicable. The same advantage is shared by electroacoustic techniques, where it is a collective response of the system that matters. In this case, the experimental quantity is the dynamic (or ac) electrophoretic mobility. In this work, both methods will be used for the investigation of the electrical surface characteristics of concentrated alumina suspensions with volume fractions of solids ranging between 1 and 20%. The data will be analyzed in the frame of the so-called cell model, often used to analyze the hydrodynamic and electrical interactions between particles in concentrated suspensions. We will show that the model is capable of properly describing both their dielectric dispersion and dynamic mobility, and that the surface (zeta) electric potential calculated from electroacoustic data can be used as an input parameter to reproduce the permittivity. This will demonstrate the internal coherence and accuracy of the cell model and give clues to improve our understanding of the electrokinetic behavior of concentrated slurries.

show abstract

Section: Dynamic Mobilitysupporting

confidence: 53%

Section: Manuscript Received On 27 June 2005 In Final Formmentioning

confidence: 99%

Section: Comparison Between Both Techniquesmentioning

confidence: 99%

See 1 more Smart Citation

Electroacoustic and dielectric dispersion of concentrated colloidal suspensions

Ahualli

Jiménez

Delgado

et al. 2006

IEEE Trans. Dielect. Electr. Insul.

Self Cite

View full text Add to dashboard Cite

show abstract

“…5,27,37,39,40,46 Another electrical boundary condition has been used in the literature. Levine This boundary condition is implicit in Ohshima's electrokinetic models for concentrated suspensions.…”

Section: Introductionmentioning

confidence: 99%

Cell Model of the Direct Current Electrokinetics in Salt-Free Concentrated Suspensions: The Role of Boundary Conditions

2006

View full text Add to dashboard Cite

In this paper, a general electrokinetic theory for concentrated suspensions in salt-free media is derived. Our model predicts the electrical conductivity and the electrophoretic mobility of spherical particles in salt-free suspensions for arbitrary conditions regarding particle charge, volume fraction, counterion properties, and overlapping of double layers of adjacent particles. For brevity, hydrolysis effects and parasitic effects from dissolved carbon dioxide, which are present to some extent in more "realistic" salt-free suspensions, will not be addressed in this paper. These issues will be analyzed in a forthcoming extension. However, previous models are revised, and different sets of boundary conditions, frequently found in the literature, are extensively analyzed. Our results confirm the so-called counterion condensation effect and clearly display its influence on electrokinetic properties such as electrical conductivity and electrophoretic mobility for different theoretical conditions. We show that the electrophoretic mobility increases as particle charge increases for a given particle volume fraction until the charge region where counterion condensation takes place is attained, for the abovementioned sets of boundary conditions. However, it decreases as particle volume fraction increases for a given particle charge. Instead, the electrical conductivity always increases with either particle charge for fixed particle volume fraction or volume fraction for fixed particle charge, whatever the set of boundary conditions previously referred. In addition, the influence of the electric permittivity of the particles on their electrokinetic properties in salt-free media is examined for those frames of boundary conditions.

show abstract

“…Some improved descriptions have already been proposed. In [52], realistic predictions of the energy that can be extracted by solving the whole set of electrokinetic equations [50,53] with a cell model [54] are provided, allowing for partial overlap of EDLs and considering the finite size of ions. The authors of this work identify optimal performances for small pore sizes [52], in agreement with recent experiments showing larger capacitances and best CDI performances with nanopores [50,55,56].…”

Section: Cdlementioning

confidence: 99%

Capacitive Mixing for Harvesting the Free Energy of Solutions at Different Concentrations

Rica

Ziano

Salerno

et al. 2013

Entropy

115

111

View full text Add to dashboard Cite

An enormous dissipation of the order of 2 kJ/L takes place during the natural mixing process of fresh river water entering the salty sea. "Capacitive mixing" is a promising technique to efficiently harvest this energy in an environmentally clean and sustainable fashion. This method has its roots in the ability to store a very large amount of electric charge inside supercapacitor or battery electrodes dipped in a saline solution. Three different schemes have been studied so far, namely, Capacitive Double Layer Expansion (CDLE), Capacitive Donnan Potential (CDP) and Mixing Entropy Battery (MEB), respectively based on the variation upon salinity change of the electric double layer capacity, on the Donnan membrane potential, and on the electrochemical energy of intercalated ions.

show abstract

Electrokinetics of Concentrated Suspensions of Spherical Colloidal Particles with Surface Conductance, Arbitrary Zeta Potential, and Double-Layer Thickness in Static Electric Fields

Cited by 78 publications

References 41 publications

Electroacoustic and dielectric dispersion of concentrated colloidal suspensions

Electroacoustic and dielectric dispersion of concentrated colloidal suspensions

Cell Model of the Direct Current Electrokinetics in Salt-Free Concentrated Suspensions: The Role of Boundary Conditions

Capacitive Mixing for Harvesting the Free Energy of Solutions at Different Concentrations

Contact Info

Product

Resources

About