Quasistatic force and torque on a spherical particle under generalized dielectrophoresis in the vicinity of walls

Quasistatic force and torque were derived on a spherical particle with radius R at a distance h next to a wall, or to the closer wall for case between two parallel walls, under generalized dielectrophoresis using effective moment approach and image method. The wall effect is minor for electrorotation and traveling wave dielectrophoresis but is significant for conventional dielectrophoresis when (L/h)(R/2h)3≥O(1), which is validated via the calculation using the Maxwell stress tensor method. Here L is the length scale of the electric field. The results can be applied in the study of cell manipulation and characterization in microfluidic devices.