FIG. 1.

(a) Schematic of electric field lines on coplanar electrodes. Particle influenced by negative dielectrophoresis (red) will move away from electrodes. Particle under positive dielectrophoretic (blue) force will move towards closest electrode edge. (b) Schematic of AC electroosmotic flow circulating on coplanar electrodes. If a particle is placed above electrode, viscous drag will push it away from electrode (red). When placed between electrodes (blue), viscous drag will bring it closer to electrode.