期刊
APPLIED PHYSICS LETTERS
卷 107, 期 7, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.4928753
关键词
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资金
- Hakubi Center, an interdisciplinary collaborative grant from WPI-iCeMS, Kyoto University
- Opto-Science Foundation
- Japan Science and Technology Agency (PRESTO)
- Grants-in-Aid for Scientific Research [26560209, 26707020] Funding Source: KAKEN
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. (C) 2015 AIP Publishing LLC.
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