The manipulation of particles in microfluidics by the use of combined field-induced dielectrophoresis and phase separation was investigated. The flowing suspensions were found to undergo a phase separation and to form a distinct front between regions enriched with and depleted of particles under the action of a high-gradient ac field and shear. This many-body phenomenon originating from interparticle electrical interactions was demonstrated to provide a method for concentrating particles in a focused region and for separating biological and nonbiological materials. An electrohydrodynamic model was used to describe the evolution of the particle patterns.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)