抄録
An electrokinetic process for the separation and/or filtering of charged order one-micron diameter particles in solution is demonstrated. Two buffered particle-laden streams of different ionic conductivities are introduced through a T-shaped microchannel. The fluid is driven by both pressure and a DC electric field. Upon application of an electric field, the particles are extracted from the lower conductivity stream and stacked into the higher conductivity stream. Both particle density imaging and quantitative velocity fields using micron-resolution particle image velocimetry are presented. Numerical simulations of the process in the conductivity gradient show the generation of a transverse electric field, therefore force acting on particles is selectively controlled in a simple microchannel.
