Dynamic magnetic manipulation using electric field addressed ferrofluidic droplets

We present a novel magnetic manipulation mechanism capable of producing two-dimensional, dynamic magnetic trapping using electric field addressed free-suspending ferrofluidic droplets. This is realized by coupling a permanent magnet with a ferrofluidic droplet that induces a highly non-uniform magnetic field for manipulating other magnetic particles. By implementing an electrode design, we use electrostatic force to drive droplet movement, and in turn, other magnetic particles. Furthermore, by tilting the magnetic field, the position of a magnetic trap can be continuously tuned in a radial fashion. Experimentally, we have successfully demonstrated the trapping and transport of 1.05 mum magnetic beads as well as other ferrofluidic droplets.