Figure 31.

Reversible EWOD observed on a drop deposited on a superhydrophobic silicon nanowires surface. (a) No tension applied, (b) a 150 Vrms tension applied (f = 1 kHz), (c) the tension is cut, the drop returns to its initial state

Verplanck et al. Nanoscale Research Letters 2007 2:577-596   doi:10.1007/s11671-007-9102-4