Electrostatic stabilization in non-aqueous media

Hoeven, P. C. van der; Lyklema, J.

doi:10.1016/0001-8686(92)80024-r

Cited by 170 publications

(116 citation statements)

References 73 publications

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“…The surfaceinduced electrolytic dissociation is probably responsible for high electrokinetic charges in nonaqueous media. Namely, high zeta potentials have been reported in solvents, in which the concentrations of pre-existing ions are low (van der Hoeven and Lyklema 1992;Morrison 1993). The very existence of electric double layer requires presence of sufficient concentration of ions.…”

mentioning

confidence: 99%

Simple model of surface-induced electrolytic dissociation of weak acids in organic solvents

Kosmulski

2010

Adsorption

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The electric conductivity of solutions of oxalic and phosphoric acid (up to 0.025 M) in ethanol and methanol has been studied in the presence of TiO 2 (1-10% by mass). TiO 2 enhanced the conductivity of solutions of oxalic and phosphoric acid in the both alcohols. The experimentally observed behavior was successfully modeled using a model with two types of surface sites. Sites of the first type bind the acids in molecular form. Sites of the second type bind the acids in form of hydrogen oxalate and dihydrogen phosphate anions, respectively, and protons are released to the solution, and contribute to enhanced conductivity. The adsorption model properly reflects the electrokinetic potential of titania particles in alcoholic solutions of oxalic and phosphoric acid.

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mentioning

confidence: 99%

Simple model of surface-induced electrolytic dissociation of weak acids in organic solvents

Kosmulski

2010

Adsorption

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“…Since particulate materials differ in their electronic properties such as dielectric constant and surface charge, the combined effect of DEP and EP forces can lead to the accumulation of corresponding crystals on different electrodes, which enables the development of particle separation methods. [21][22][23][24] However, in order to be collected from the solution, the accumulated crystals need to be immobilized on the electrode. This immobilization of crystals was realized by slowly cooling the suspension in the presence of the electric field.…”

Section: Concomitant Solid Separation Through Electric Field Enhancedmentioning

confidence: 99%

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

Radacsi

Kramer

et al. 2016

Angew Chem Int Ed

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This version is available at https://strathprints.strath.ac.uk/59326/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. COMMUNICATION Concomitant Solid Separation through Electric Field Enhanced CrystallizationWei W. Li, [b] Norbert Radacsi, [b] Herman J.M. Kramer, [b] Antoine E. D. M. van der Heijden [b] and Joop H. ter Horst* [a] Abstract: 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 of 1,4-dioxane. First, the crystals of both compounds were collected at different electrodes under the influence of the electric field. Subsequent cooling crystallization allowed the immobilization and growth of the particles on the electrodes, which were separately collected after the experiment with purities higher than 91%. This method can be further developed into a technique for crystal separation and recovery in complex multicomponent suspensions of industrial processes.Crystallization is an effective and efficient separation technology that can, in a single process step, recover the desired compounds from solutions as high purity (>99%) crystalline solids [1,2,3,4] . However, such highly purified product is hard to obtain from a multi-component solution by direct crystallization, such as the product stream from a type-I Multicomponent Reaction (MCR), [5,6] or a racemic mixture of chiral pharmaceutical compounds, [7] since a mixed suspension is a likely result. Further purification of the solid phase usually requires additional steps (see Figure 1 (a) for instance), which will inevitably lead to the loss of valuable products. Alternatively, a single crystallization step coupled with simultaneous particle separation could diminish the product loss wh...

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“…Electrostatic stabilization is mainly considered for silica suspensions in water. In non-aqueous media it can readily occur in highly polar solvents with high dielectric constant (ε > 11) but is also possible in semipolar liquids (5 < ε < 11) [24,25] or even in solvents of very low ε, like 2 [26]. End-capped polyethylene glycols have ε of the order of 6-10 [24], thus, electrostatic stabilization in PEGDMA should be possible.…”

Section: System Stabilitymentioning

confidence: 99%

Photocurable polymethacrylate-silica nanocomposites: correlation between dispersion stability, curing kinetics, morphology and properties

2016

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A comprehensive study of model systems based on poly(ethylene glycol) dimethacrylate and two methacryloxymodified silicas (Aerosil R7200 and R711) were investigated to find possible correlation between the stability of the monomer/silica dispersion, curing kinetics, composite morphology and physical and mechanical properties of the final hybrid material. The monomer/silica dispersions were cured photochemically. The investigated parameters: Zeta potential, polymerization rate and conversion, glass transition, surface roughness and mechanical properties were found to be synchronous; when plotted as function of silica content, they showed maxima or changes in the trend at the same filler loading. This threshold (optimum) silica content in the composition was about 5 wt.-% for the investigated systems. The results obtained are discussed in terms of the solvation cell (which influences dispersion stability) and the interphase layer formation as well as their changes below and above of the threshold filler content.

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Electrostatic stabilization in non-aqueous media

Cited by 170 publications

References 73 publications

Simple model of surface-induced electrolytic dissociation of weak acids in organic solvents

Simple model of surface-induced electrolytic dissociation of weak acids in organic solvents

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

Photocurable polymethacrylate-silica nanocomposites: correlation between dispersion stability, curing kinetics, morphology and properties

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