  Advancements in understanding the lateral migration of particles have helped
in enhanced separation in microfluidic devices. In this work, we investigate
the effects of electrokinetics on the particle migration in a viscoelastic
flow, where the electric field is applied parallel to the flow. Through
experiments and theoretical analysis, we show that the interaction of
electrokinetic and rheological effects can result in an enhancement in the
migration by an order of magnitude. The theoretical analysis, in agreement with
experiments, demonstrates that the particles can be focused at different
equilibrium positions based on their intrinsic electrical properties.
