Oscillation and collective conveyance of water-in-oil droplets by microfluidic bolus flow
Oscillation and collective conveyance of water-in-oil droplets by microfluidic bolus flow
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DOI：
10.1063/1.4928753
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发表时间：
2015-05
影响因子：
4
通讯作者：
T. Ohmura;M. Ichikawa;K. Kamei;Y. Maeda
中科院分区：
文献类型：
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作者：
T. Ohmura;M. Ichikawa;K. Kamei;Y. Maeda
微流控技术已得到广泛发展，以实现在一个小芯片的微全分析系统。对于微观分析，电磁力通常被用于捕获物体，但流体动力学尽管与图案形成有关，但很少被探索。在这里，我们报告，油包水（W/O）液滴可以在其他大的W/O液滴阵列的网格中运输。当每个液滴接近大液滴阵列的间隙时，同时表现出持续的来回运动，其以等于液滴阵列的速度被输送。我们确认的外观封闭流线的数值模拟，这表明一个漩涡状的流参与捕获的液滴。此外，一个以上的液滴也被输送作为一个有序的集群与动态重新定位。
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.