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The microchannel corner is a common inherent component of most planarmicrofluidic systems and thus its influence on the channel flow is ofsignificant interest. Application of an alternating current electric fieldenables quantification of the non-linear induced-charge electro-osmosis (ICEO)ejection flow effect by isolating it from linear electro-osmotic backgroundflow which is present under dc forcing. The hydrodynamic flow in the vicinityof a sharp channel corner is analyzed using experimentalmicro-particle-image-velocimetry (PIV) and numerical simulations for differentbuffer concentrations, frequencies and applied voltages. Divergence from thepurely ICEO flow with increasing buffer conductivity is shown to be a result ofincreasing electro-thermal effects due to Joule heating.

Competition between Induced-Charge Electro-Osmosis and Electro-Thermal Effects around a Weakly-Polarizable Microchannel Corner