Microfluidic mixing through electrowetting-induced droplet oscillations

Friedrich Gunther Mugele, J.-C. Baret, D. Steinhauser

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141 Citations (Scopus)


We used electrowetting to trigger self-excited oscillations of millimeter-sized sessile droplets of water-glycerol mixtures in a viscosity range from 1 to 65 mPa s. During the oscillations the contact angle of the droplets varied periodically between [approximate]130° and 80° with a frequency between 10 and 125 s–1, depending on the viscosity and the drop size. By initially staining drops partially with fluorescent dye, we found that the liquid within the drop is completely mixed within 100–2000 oscillation cycles for low and high viscosities, respectively. Compared to pure diffusion, droplet oscillations accelerated mixing by approximately two orders of magnitude for millimeter-sized droplets
Original languageUndefined
Pages (from-to)204106-1-
Number of pages3
JournalApplied physics letters
Issue number204106
Publication statusPublished - 2006


  • IR-57978
  • METIS-235287

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