Recent developments in electrokinetics of salt-free concentrated suspensions

Delgado, A.V.; Carrique, F.; Roa, Rafael

doi:10.1016/j.cocis.2016.06.004

Cited by 22 publications

(13 citation statements)

References 77 publications

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“…Particle charge arises from these surface-bound ionic groups. 26 This approach creates a unique ionic environment, with a substantial mismatch between the highly charged particles and the ion-free non-polar solvent. This results in several characteristic features for electrokinetic measurements of charged spheres in salt-free media.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and electrokinetics of cationic spherical nanoparticles in salt-free non-polar media

et al. 2018

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Section: Introductionmentioning

confidence: 99%

Synthesis and electrokinetics of cationic spherical nanoparticles in salt-free non-polar media

et al. 2018

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“…With that aim, the so-called cell model will be used. This was first introduced by Kuwabara [ 38 ], and further elaborated by different authors [ 24 , 35 , 39 , 40 , 41 ]. It is based on the assumption that the cited interactions can be represented by assuming that a single particle is in a concentric sphere of solution, such that its radius b guarantees that the volume fraction of solids in the sphere (the cell) is the same as in the whole dispersion:

and the boundary conditions for the quantities of interest at

will determine the interactions.…”

Section: Modelmentioning

confidence: 99%

“…Interest in salt-free systems is also considerable; they can form long- or short-ranged ordered structures resembling crystalline solids, that is, colloidal crystals [ 20 , 21 , 22 , 23 ]. Their electrokinetic study was started and extended by Ohshima [ 24 , 25 , 26 , 27 , 28 , 29 , 30 ], although contributions by others must also be mentioned, particularly in the case of AC electric fields and concentrated suspensions [ 31 , 32 , 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

AC Electrokinetics of Salt-Free Multilayered Polymer-Grafted Particles

et al. 2020

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Interest in the electrical properties of the interface between soft (or polymer-grafted) nanoparticles and solutions is considerable. Of particular significance is the case of polyelectrolyte-coated particles, mainly taking into account that the layer-by-layer procedure allows the control of the thickness and permeability of the layer, and the overall charge of the coated particle. Like in simpler systems, electrokinetic determinations in AC fields (including dielectric dispersion in the 1 kHz–1 MHz frequency range and dynamic electrophoresis by electroacoustic methods in the 1–18 MHz range) provide a large amount of information about the physics of the interface. Different models have dealt with the electrokinetics of particles coated by a single polymer layer, but studies regarding multi-layered particles are far scarcer. This is even more significant in the case of so-called salt-free systems; ideally, the only charges existing in this case consist of the charge in the layer(s) and the core particle itself, and their corresponding countercharges, with no other ions added. The aims of this paper are as follows: (i) the elaboration of a model for the evaluation of the electrokinetics of multi-grafted polymer particles in the presence of alternating electric fields, in dispersion media where no salts are added; (ii) to carry out an experimental evaluation of the frequency dependence of the dynamic (or AC) electrophoretic mobility and the dielectric permittivity of suspensions of polystyrene latex spherical particles coated with successive layers of cationic, anionic, and neutral polymers; and (iii) finally, to perform a comparison between predictions and experimental results, so that it can be demonstrated that the electrokinetic analysis is a useful tool for the in situ characterization of multilayered particles.

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“…Subsequently, the entire crystalline mass accumulates on the surface of the anode. As particulate materials differ in their electronic properties, such as the dielectric constant and surface charge, the combined effect of DEP and EP forces can lead to the accumulation of the corresponding crystals on different electrodes, which enables the development of particle separation methods …”

Section: Figurementioning

confidence: 99%

Solid Separation from a Mixed Suspension through Electric‐Field‐Enhanced Crystallization

Radacsi

Kramer

et al. 2016

Angewandte Chemie

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When applied to a pure component suspension in an apolar solvent, a strong inhomogeneous electric field induces particle movement, and the particles are collected at the surface of one of the two electrodes. This new phenomenon was used to separately isolate two organic crystalline compounds, phenazine and caffeine, from their suspension in 1,4‐dioxane. First, crystals of both compounds were collected at different electrodes under the influence of an electric field. Subsequent cooling crystallization enabled the immobilization and growth of the particles on the electrodes, which were separately collected after the experiment with purities greater than 91 %. This method can be further developed into a technique for crystal separation and recovery in complex multicomponent suspensions of industrial processes.

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Recent developments in electrokinetics of salt-free concentrated suspensions

Cited by 22 publications

References 77 publications

Synthesis and electrokinetics of cationic spherical nanoparticles in salt-free non-polar media

Synthesis and electrokinetics of cationic spherical nanoparticles in salt-free non-polar media

AC Electrokinetics of Salt-Free Multilayered Polymer-Grafted Particles

Solid Separation from a Mixed Suspension through Electric‐Field‐Enhanced Crystallization

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