The surface energy present in a small drop of liquid is used to pump the liquid through a microchannel. The flow rate is determined by the volume of the drop present on the pumping port of the microchannel. A flow rate of 1.25 μL s−1 is demonstrated using 0.5 μL drops of
G. M. Walker and D. J. Beebe, Lab Chip, 2002, 2, 131 DOI: 10.1039/B204381E
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