Journal
APPLIED PHYSICS LETTERS
Volume 77, Issue 11, Pages 1725-1726Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1308534
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A microactuator for rapid manipulation of discrete microdroplets is presented. Microactuation is accomplished by direct electrical control of the surface tension through two sets of opposing planar electrodes fabricated on glass. A prototype device consisting of a linear array of seven electrodes at 1.5 mm pitch was fabricated and tested. Droplets (0.7-1.0 mu l) of 100 mM KCl solution were successfully transferred between adjacent electrodes at voltages of 40-80 V. Repeatable transport of droplets at electrode switching rates of up to 20 Hz and average velocities of 30 mm/s have been demonstrated. This speed represents a nearly 100-fold increase over previously demonstrated electrical methods for the transport of droplets on solid surfaces. (C) 2000 American Institute of Physics. [S0003-6951(00)01237-7].
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