An integrated AC electrokinetic pump in a microfluidic loop for fast and tunable flow control
An integrated AC electrokinetic pump in a microfluidic loop for fast and tunable flow control
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DOI：
10.1039/b408382m
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发表时间：
2004-01-01
期刊：
影响因子：
4.2
通讯作者：
Ajdari, A
中科院分区：
文献类型：
--
作者：
Studer, V;Pépin, A;Ajdari, A
我们在芯片上建立了一个专门的实验室来研究由低压交流信号驱动的集成电动微泵的性能。这个微泵由一组交错的电极组成，在这里集成在一个微流体回路中。我们证明了该装置可以连续泵送低至中等离子强度的电解质溶液。泵送速度可达500 mum s(-1)，在20 mum深和100 mm宽的通道中，驱动信号在1-10 kHz范围内，振幅仅为几伏。此外，我们还观察到在更高频率（50-100 kHz）下泵送方向的有趣反转。由于集成了微混合器，我们的设备允许系统和自动地探索离子强度的影响。
We have built a dedicated lab on a chip to study the performance of an integrated electrokinetic micropump, driven by a low voltage AC signal. This micropump consists of an array of interdigitated electrodes and is here integrated in a microfluidic loop. We demonstrate that this device can pump continuously and reproducibly electrolyte solutions of low to moderate ionic strength. The pumping speed reaches up to 500 mum s(-1) in 20 mum deep and 100 mm wide channels with a driving signal in the 1-10 kHz range and an amplitude of only a few volts. In addition, we have observed an interesting reversal of the pumping direction at higher frequencies (50-100 kHz). Our device permits a systematic and automated exploration of the influence of the ionic strength thanks to an integrated micromixer.