Induced-Charge Electro-Osmosis

Sugioka H (2008) Suppression of reverse flows in pumping by induced-charge electro-osmosis using asymmetrically stacked elliptical metal posts. Phys Rev E 78(5) 057301 1-057301 4... 

Squires TM, Bazant MZ (2006) Breaking symmetries in induced-charge electro-osmosis. J Fluid Mech 560 65-101... 

Zhao H, Bau HH (2007) On the effect of induced-charge electro-osmosis on a cylindrical particle next to a surface. Langmuir 23 4053-4063... 

Yossifrai G, Frankel I, Miloh T (2007) Symmetry breaking in induced-charge electro-osmosis over polarizable spheroids. Phys Fluids 19 068105... 

ACEO is a phenomenon of induced-charge electro-osmosis (ICEO), where flow is generated by the action of an electric field on its own induced diffuse charge near a polarizable surface. The main difference with other examples of ICEO, such as flows around metal colloids, is that ACEO involves electrode surfaces, which supply both the electric field and the induced screening charge, in different regions at different times. For this reason, ACEO is inherently time-dependent (as the name inplies) and tied to the dynamics of diffuse charge, as ions move to screen the electrodes. 

Induced-charge electro-osmosis refers to nonlinear electro-osmotic flow of a liquid electrolyte, when an electric held acts on its own induced diffuse charge near a polarizable surface. 

The possibility of nonlinear electro-osmotic flow, varying as tt a E, seems to have been first described by Murtsovkin [1, 16], who showed that an alternating electric field can drive steady quadrupolar flow around a polarizable particle (Fig. la). This effect has recently been unified with other nonlinear electrokinetic phenomena in microfluidics [2], such as AC electro-osmotic flow (ACEO) at microelectrodes [4, 11,12] (Fig. lb), DC electrokinetic jets at dielectric comers [5] (Fig. Ic), and nonlinear flows around metal posts [3] (Fig. Id-e). These are all cases of induced-charge electro-osmosis (ICEO) -the nonlinear electro-osmotic flow resulting from the action of an electric field on its own induced diffuse charge near a polarizable surface. 

Nonlinear Electrokinetic Phencmena, Figure 2 Physical mechanism for induced-charge electro-osmosis around an ideally polarizable metal cylinder... 

Levitan JA, Devasenathipathy S, Studer V, Ben Y, Thorsen T, Squires TM, Bazant MZ (2005) Experimental observation of induced-charge electro-osmosis around a metal wire in a microchannel. Colloid Surf A Physicochem Eng Asp 267 122-132... 

Induced-Charge Electro-Osmosis Induced-Charge Electrophoresis... 

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