Electroosmosis at spherical and cylindrical metal surfaces

Barinova, N. O.; Mishchuk, N. A.; Nesmeyanova, T. A.

doi:10.1134/s1061933x08060033

“…Murtsovkin's group proceeded to observe these flows around mercury drops [23] and metallic particles [24]. For larger particles, the flow was in the opposite direction of the theory, and this was conjectured to be due to the onset of Faradaic reactions at large induced voltages, consistent with recent experiments on millimeter scale metal objects by Barinova et al [25]. (The Ukrainian school of Shilov [26] and Mishchuk [27] continues to make advances in nonlinear electrophoresis, e.g.…”

Section: Introductionsupporting

confidence: 56%

Induced-charge electrokinetic phenomena

Bazant

¹

,

Squires

²

2010

Current Opinion in Colloid & Interface Science

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The field of nonlinear "induced-charge" electrokinetics is rapidly advancing, motivated by potential applications in microfluidics as well as by the unique opportunities it provides for probing fundamental scientific issues in electrokinetics. Over the past few years, several surprising theoretical predictions have been observed in experiments: (i) induced-charge electrophoresis of half-metallic Janus particles, perpendicular to a uniform AC field; (ii) microfluidic mixing around metallic structures by induce-charge electro-osmosis, (iii) fast, high-pressure AC electroosmotic pumping by non-planar electrode arrays, and ICEK effects upon the collective behavior of polarizable particle suspensions has been studied theoretically and computationally. A new experimental system enables a clean and direct comparison between theoretical predictions and measured ICEK flows, providing a route to fundamental studies of particular surfaces and highthroughput searches for optimal ICEK systems. Systematic discrepancies between theory and experiment have engendered the search for mechanisms, including new theories that account for electrochemical surface reactions, surface contamination, roughness, and the crowding of ions at high voltage. Promising directions for further research, both fundamental and applied, are discussed.

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“…Moreover, copper was non-uniformly deposited on the ring surface, thus leading to a fast growth of dendrites, which shunted the region of the ISC changing the character of metal particle polarization (reducing the ISC and, consequently, electroosmosis of the second kind). Thus, experimental data were obtained only for low concentrations of copper salts, which cannot fully eliminate the water electrolysis [138]. Nevertheless, even at such concentration, the same velocities can be obtained at considerably lower electric field than in the case of distilled water (Fig.…”

Section: Electroosmosis Of the Second Kind Near Particles With Electrmentioning

confidence: 70%

“…17), in the case of thick rings with the internal hole of about 15% of the ring diameter, the development of a regular vortex at the anodic side of the rings failed ( Fig. 6 in [138]). Several small vortices, permanently changing their direction and velocity, were observed in this region.…”

Section: Electroosmosis Of the Second Kind Near Particles With Electrmentioning

confidence: 91%

“…17), which complicates a comparison with the velocities obtained for ion-exchange particles. In addition, there was an attempt [138] to study electroosmosis that develops at copper rings in an electrolyte solution containing copper salts. This approach implied the generation of a current due to the discharge of copper cations on the surface of a copper ring.…”

Section: Electroosmosis Of the Second Kind Near Particles With Electrmentioning

confidence: 99%

“…Experimental investigations of electroosmosis of the second kind were performed for steel spherical particles and copper rings placed in distilled water [138]. A noticeable liquid flow appeared only at sufficiently high voltage satisfying the condition (21).…”

Section: Electroosmosis Of the Second Kind Near Particles With Electrmentioning

confidence: 99%

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Concentration polarization of interface and non-linear electrokinetic phenomena

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Induced-Charge Electrokinetic Phenomena

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¹

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Electrokinetics and Electrohydrodynamics in Microsystems

View full text Add to dashboard Cite

The field of nonlinear "induced-charge" electrokinetics is rapidly advancing, motivated by potential applications in microfluidics as well as by the unique opportunities it provides for probing fundamental scientific issues in electrokinetics. Over the past few years, several surprising theoretical predictions have been observed in experiments: (i) induced-charge electrophoresis of half-metallic Janus particles, perpendicular to a uniform AC field; (ii) microfluidic mixing around metallic structures by induce-charge electro-osmosis, (iii) fast, high-pressure AC electroosmotic pumping by non-planar electrode arrays, and ICEK effects upon the collective behavior of polarizable particle suspensions has been studied theoretically and computationally. A new experimental system enables a clean and direct comparison between theoretical predictions and measured ICEK flows, providing a route to fundamental studies of particular surfaces and highthroughput searches for optimal ICEK systems. Systematic discrepancies between theory and experiment have engendered the search for mechanisms, including new theories that account for electrochemical surface reactions, surface contamination, roughness, and the crowding of ions at high voltage. Promising directions for further research, both fundamental and applied, are discussed.

show abstract

Electroosmosis at spherical and cylindrical metal surfaces

Cited by 11 publications

References 12 publications

Induced-charge electrokinetic phenomena

Induced-charge electrokinetic phenomena

Concentration polarization of interface and non-linear electrokinetic phenomena

Induced-Charge Electrokinetic Phenomena

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