Oscillation and collective conveyance of water-in-oil droplets by microfluidic bolus flow

Takuya Ohmura, Masatoshi Ichikawa, Ken Ichiro Kamei, Yusuke T. Maeda

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Microfluidic techniques have been extensively developed to realize micro-total analysis systems in a small chip. For microanalysis, electro-magnetic forces have generally been utilized for the trapping of objects, but hydrodynamics has been little explored despite its relevance to pattern formation. Here, we report that water-in-oil (W/O) droplets can be transported in the grid of an array of other large W/O droplets. As each droplet approaches an interspace of the large droplet array, while exhibiting persistent back-and-forth motion, it is conveyed at a velocity equal to the droplet array. We confirm the appearance of closed streamlines in a numerical simulation, suggesting that a vortex-like stream is involved in trapping the droplet. Furthermore, more than one droplet is also conveyed as an ordered cluster with dynamic reposition.

Original languageEnglish
Article number074102
JournalApplied Physics Letters
Issue number7
Publication statusPublished - Aug 17 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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