AC Electro-Osmosis

Wu J (2006) Biased AC electro-osmosis for on-chip bioparticle processing. IEEE Trans Nanotechnol 5 84-88... 

Bazant MZ, Urbanski JP, Levitan JA, Subramanian K, Kilic MS, Jones A, Thorsen T (2007) Electrolyte dependence of AC electro-osmosis. In Proceedings of 11th international conference on miniaturized systems for chemistry and life sciences (MicroTAS), pp 285-2878... 

AC electro-osmosis (ACEO) is a nonlinear electrokinetic phenomenon of induced-charge electro-osmotic flow around electrodes applying an alternating voltage. 

In the late 1990s, Ramos et al. discovered steady electro-osmotic flow over a pair of micro-electrodes applying an AC voltage and dubbed the effect AC electro-osmosis [1]. Around the same time, Ajdari predicted ACEO flow over periodic electrode arrays and showed how the effect could be used for long-range pumping [2]. As the performance of ACEO pumps has advanced [3,4], ACEO has also been exploited, in conjunction with dielectrophoresis (DEP), in different geometries to manipulate particles and cells in microfluidic devices [5-7]. 

AC electro-osmosis (ACEO) Nonlinear electrophoretic mobility... 

DC electro-osmosis. AC electro-seismic. Particle alignment. Asymmetric AC-fleld and particle drift. Chemo-osmosis. Thermal consohdation - Desiccation shrinkage. DC electro-osmosis. AC electro-seismic. 

For the near wall solution, from the slipping plane to 3 Debye lengths from the wall, the solution is restricted to cases where there are no inertial effects within this region. In other words the left hand side of (5) goes to zero and we are left with an equation of the same form as the DC electro-osmosis equation but now with an AC electric field. The solution to this equation is... 

AC pumping of liquids Traveling-wave electro-osmosis... 

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. 

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