Concentration polarization of interface and non-linear electrokinetic phenomena

Mishchuk, N. A.

doi:10.1016/j.cis.2010.07.001

Cited by 150 publications

(114 citation statements)

References 141 publications

(331 reference statements)

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“…Even for the simple case of a homogeneous metallic sphere, it is unclear why the experimental velocities [10,13] Recent numerical simulations [17] suggest that one of the reasons might be the concentration polarization effect [18][19]. , since it has been reported that pure water yields the highest electrophoretic velocity of Janus particles while addition of salts cause a slow-down [13].…”

mentioning

confidence: 99%

Induced-charge electro-osmosis around metal and Janus spheres in water: Patterns of flow and breaking symmetries

et al. 2014

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We establish experimentally the flow patterns of induced-charge electro-osmosis (ICEO) around immobilized metallic spheres in aqueous electrolyte. The AC field modifies local electrolyte concentration and causes quadrupolar flows with inward velocities being smaller than the outward ones. At high fields, the flow becomes irregular, with vortices smaller than the size of the sphere. Janus metallo-dielectric spheres create dipolar flows and pump the fluid from the dielectric toward the metallic part. The experimentally determined far-field flows decay with the distance as r -3 .

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mentioning

confidence: 99%

Induced-charge electro-osmosis around metal and Janus spheres in water: Patterns of flow and breaking symmetries

et al. 2014

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“…Under this condition, the potential drop over a convective-diffusion layer near a particle surface becomes larger than its electrokinetic potential, meaning that the interface polarization becomes strong enough for nonlinear electroosmosis to appear (Mishchuk and Dukhin 2002b;Mishchuk 2010). The value of the critical potential drop U cr for ion-exchange materials is typically equal to 100-150 mV.…”

Section: General Notion About Electroosmosis Of the Second Kindmentioning

confidence: 97%

“…In general, this phenomenon can occur near both nonconductive and conductive particles (Mishchuk 2010). However, the largest induced charge is obtained for conductive materials with high selectivity of current carriers (positive or negative ions for ion exchangers, electrons for metals, or holes for semi-conductors).…”

Section: General Notion About Electroosmosis Of the Second Kindmentioning

confidence: 99%

Microfluidic pump based on the phenomenon of electroosmosis of the second kind

Mishchuk

Heldal²,

Volden³

et al. 2011

Microfluid Nanofluid

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A micropump based on strong polarization of ion-exchange beads and corresponding actuation by electroosmosis of the second kind was designed and fabricated. Experimental results from operation with AC and DC voltage showed a close to second order relationship between flow and voltage, in good agreement with theory. The difference between experimental and theoretical flow rates and pressures is attributed to the hydrodynamic resistance of the channel network. A modified pump design which should yield higher flow rates and pressures was suggested.

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“…In a real situation, the diffusive layers are built up on both sides of the membrane (Katchalsky and Curran 1965;Barry and Diamond 1984;Śle˛zak 1989;Larchet et al 2008;Mishchuk 2010). Diffusive layers are the cause of lower gradients of thermodynamic forces in the membrane and appearance of substance gradients in diffusive layers at membrane surfaces.…”

Section: The Resistance Coefficients Of a Membrane In Concentration Pmentioning

confidence: 99%

Resistance Coefficients of Polymer Membrane with Concentration Polarization

2012

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The Kedem-Katchalsky equations, modified by means of symmetric transformations of Peusner thermodynamic networks, were applied to interpret the membrane transport in concentration polarization conditions. The results from the study demonstrate that the resistance coefficients counted for membrane transport of aqueous solutions of glucose through Nephrophan membrane in horizontal plane are nonlinearly dependent on mean concentration of glucose in the membrane (C). It was also shown that the threshold value of concentration (C cr ) existed, and forC >C cr , the resistance coefficients depend, while for C C cr ) causes decrease of difference between resistance coefficients of the membrane system in homogeneous conditions (solutions mechanically stirred) and in conditions with hydrodynamic instabilities (configuration B). Besides increase of mean glucose concentration in the membrane (in the rangē C >C cr ) causes increase of the difference between resistance coefficients for membrane system with concentration polarization without hydrodynamic instabilities (configuration A) and membrane system in homogeneous conditions. Keywords

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Concentration polarization of interface and non-linear electrokinetic phenomena

Cited by 150 publications

References 141 publications

Induced-charge electro-osmosis around metal and Janus spheres in water: Patterns of flow and breaking symmetries

Induced-charge electro-osmosis around metal and Janus spheres in water: Patterns of flow and breaking symmetries

Microfluidic pump based on the phenomenon of electroosmosis of the second kind

Resistance Coefficients of Polymer Membrane with Concentration Polarization

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