We have developed a technique for picoinjecting microfluidic drops that does not require metal electrodes. As such, devices incorporating our technique are simpler to fabricate and to use.
O'Donovan, B., Tran, T., Sciambi, A., Abate, A. Picoinjection of Microfluidic Drops Without Metal Electrodes. J. Vis. Exp. (86), e50913, doi:10.3791/50913 (2014).