Unexpected beads alignment in a microfluidic channel
Unexpected beads alignment in a microfluidic channel
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DOI：
10.1109/iros.2016.7759755
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发表时间：
2016-10
期刊：
影响因子：
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通讯作者：
C. Tsai;M. Phan;Koji Mizoue;M. Kaneko
中科院分区：
文献类型：
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作者：
C. Tsai;M. Phan;Koji Mizoue;M. Kaneko
在微流体通道中观察到令人惊讶的现象，其中悬浮的微珠自发地排列成线。微珠以相对较高的速度（3.27 μm/ms）随机分布在通道中，但以相对较低的速度（0.05 μm/ms）开始排列成线。在通道中有障碍物和无障碍物的情况下，重复了对线。该现象被解释为实验环境周围的非预期声波，并且该波导致驻波，该驻波将微珠朝向驻波的节点移动。通过频率分析仪的分析，发现系统中的脉宽调制控制器产生的高频信号是最可能的对准波源。给出了实验结果，并对声波的特性进行了分析.这种现象可能有助于微流体应用实现声学对准，而无需复杂的叉指换能器制造。
A surprising phenomenon is observed in a microfluidic channel where suspending microbeads are spontaneously aligned into lines. Microbeads are randomly distributed in the channel at a relatively high velocity (3.27 μm/ms), but start to align into lines at a relatively low velocity (0.05 μm/ms). The alignment has been repeated with and without obstacles in the channel. The phenomenon is interpreted as an unintended acoustic wave being around the experimental environment, and the wave resulted in a standing wave which moves the microbeads towards the nodes of the standing wave. By using a frequency analyzer, it is found that a pulse-width-modulation controller in the system generated high-frequency signals, which is the most possible wave source for the alignment. The experimental results are presented, and characteristics of acoustic wave are analyzed. The phenomenon could contribute to microfluidic applications for achieving acoustic alignment without complex fabrication of interdigital transducers.