Applications of electrokinetic phenomena in materials science

Llorente, Irene; Fajardo, S.; Bastidas, J. M.

doi:10.1007/s10008-013-2267-0

Cited by 22 publications

(12 citation statements)

References 93 publications

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“…Upon application of an electric field, stress generated in the electric double layer gives rise to motion of the fluid with respect to the surface. Relying on high surface-to-volume ratios, this electroosmotic flow is of particular interest in the context of gel electrophoresis, 7 nano and microfluidics, lab-on-a-chip devices 8 and surface characterization, 9 but also for biological function 10 and drug delivery. 11 At low surface charge density, the electroosmotic mobility increases linearly with the surface charge density, allowing for a straightforward measurement.…”

Section: Introductionmentioning

confidence: 99%

Viscous interfacial layer formation causes electroosmotic mobility reversal in monovalent electrolytes

Rezaei

Azimian

Pishevar

et al. 2018

Phys. Chem. Chem. Phys.

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We study the ion density, shear viscosity and electroosmotic mobility of an aqueous monovalent electrolyte at a charged solid surface using molecular dynamics simulations. Upon increasing the surface charge density, ions are displaced first from the diffuse layer to the outer Helmholtz layer, increasing its viscosity, and subsequently to the hydrodynamically stagnant inner Helmholtz layer. The ion redistribution causes both charge inversion and reversal of the electroosmotic mobility. Because of the surface-charge dependent interfacial hydrodynamic properties, however, the charge density of mobility reversal differs from the charge density of charge inversion, depending on the salt concentration and the chemical details of the ions and the surface. Mobility reversal cannot be described by an effective slip boundary condition alone - the spatial dependence of the viscosity is essential.

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Section: Introductionmentioning

confidence: 99%

Viscous interfacial layer formation causes electroosmotic mobility reversal in monovalent electrolytes

Rezaei

Azimian

Pishevar

et al. 2018

Phys. Chem. Chem. Phys.

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“…The term "electrokinetics" refers to the motion of small particles in fluids that is induced by an electrical field (Chillingar and Haroun 2014). The principles of electrokinetic phenomena have been applied in various areas such as soil and groundwater remediation (Wise 2000;Chillingar and Haroun 2014), material science (Llorente et al 2014), biology and medicine (Abramson 1934), water treatment (Hayes 2012;Peraki et al 2016), and many others. In particular, EK has been used for decontamination of hydrocarbon polluted soils (Hunter 1981;Bruell et al 1992, Wise 2000, which involves: (1) electro-migration, (2) electrophoresis, and (3) electro-osmosis processes.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of two-phase flow encountered in electrically enhanced oil recovery

Peraki

Ghazanfari

Pinder

2018

J Petrol Explor Prod Technol

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The study of two-phase immiscible flow in porous media using electrokinetics is important in different fields including the remediation of hydrocarbon contaminated soils and enhanced oil recovery. While electrokinetic technology has been traditionally used for treatment and decontamination of hydrocarbon polluted sites, electrically enhanced oil recovery (EEOR) is relatively new. Although a few laboratory and field experiments have investigated the potential promise of the EEOR method, further investigation is necessary to better understand the fundamentals and the importance of different parameters/ processes that affect the oil production in this method. This study presents a numerical investigation of two-phase flow in EEOR method in an attempt to provide insight into the feasibility of, and the important parameters involved in this method. A sensitivity analysis is performed on important parameters involved in EEOR combined with water flooding. Most of the investigated reservoir and operational parameters were found to be significant and critical to the transport phenomena controlling the oil production. In addition, the results showed that the applied electrical gradient involved in EEOR combined with water flooding contributes to a small increase in oil production.

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“…These phenomena have been exploited with the aim of improving concrete performance, e.g. to remove chlorides or other contaminants from concrete, to inject inhibitors that protect reinforcement from corrosion and to restore concrete alkalinity . Some of these methods have been used for decades and are effective in improving concrete resistance to aggressive environments and enhancing its durability .…”

Section: Introductionmentioning

confidence: 99%

Effect of electroosmotic flow of aqueous suspension of nanosilica on the properties of carbonated concrete

Redaelli

Isfahani

Lollini

et al. 2017

Materials & Corrosion

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The paper investigates the possibility to use electroosmosis to transport nanosilica (NS) particles inside carbonated concrete, in order to exert a filler effect and enhance its durability performance. This method aims to extending possible beneficial effects of NS to existing reinforced concrete structures, where the presence of a carbonated layer of concrete is very likely. Injection tests were performed with electrochemical cells on carbonated concrete discs with water/ cement (w/c) ratios of 0.50, 0.55 and 0.65, using a NS aqueous suspension at the anode. The results indicated that a flow did occur through the concrete disc and it was directed from the anode towards the cathode. A linear relationship between flux and applied voltage gradient was obtained, which is typical of electroosmotic phenomena. The bulk properties of concrete, such as density, water absorption and sorptivity, were not affected by the injection tests, whilst electrical resistivity increased indicating a mild 'sealing' effect on the surface. Also microstructural analyses highlighted the local presence of NS that decreased the local porosity close to the surface.

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Applications of electrokinetic phenomena in materials science

Cited by 22 publications

References 93 publications

Viscous interfacial layer formation causes electroosmotic mobility reversal in monovalent electrolytes

Viscous interfacial layer formation causes electroosmotic mobility reversal in monovalent electrolytes

Numerical investigation of two-phase flow encountered in electrically enhanced oil recovery

Effect of electroosmotic flow of aqueous suspension of nanosilica on the properties of carbonated concrete

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