Pneumatically driven peristaltic micropumps utilizing serpentine-shape channels
Pneumatically driven peristaltic micropumps utilizing serpentine-shape channels
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DOI：
10.1088/0960-1317/16/2/019
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发表时间：
2006-02-01
影响因子：
2.3
通讯作者：
Lee, GB
中科院分区：
文献类型：
--
作者：
Wang, CH;Lee, GB
本研究提出了一种具有蛇形（s形）微通道的新型气动微泵。流体通过位于流体微通道和s形微通道交叉处的膜的蠕动作用所产生的动水压力驱动通过装置。气动微泵是用基于MEMS（微机电系统）技术的聚二甲基硅氧烷（PDMS）制造的。该微型泵提供了更高的泵速，并使用单个电磁阀（EMV）开关进行控制。实验结果表明，提高EMV的工作频率、外源压缩空气的压力或膜的数量都可以提高泵送速率。当压缩空气沿着s型微通道移动时，它会导致膜偏转。连续膜沿微通道长度的时间相偏转产生蠕动效应，驱动流体沿微流体通道移动。可达到的最大泵送速率受相邻膜挠曲之间的时间间隔的影响，因此受蛇形微通道几何特性的影响。以固定的峰值频率测量蛇形微泵的背压，以证明其克服流体阻力的能力。实验验证了微泵的最佳工作条件和几何参数。研究发现，最大泵送速率为7.43 μ l min(-1)，由一个带有7个膜的微泵提供，由20 psi气压和9 Hz工作频率驱动。
This study presents a novel pneumatic micropump featuring a serpentine-shape (S-shape) microchannel. Fluid is driven through the device by the hydrodynamic pressure generated by the peristaltic action of membranes located at the intersections of the fluidic microchannel and the S-shape microchannel. The pneumatic micropump is fabricated in PDMS (polydimethylsiloxane) using MEMS (micro-electro-mechanical-systems)-based techniques. The micropump provides an improved pumping rate and is controlled using a single electromagnetic valve (EMV) switch. The experimental results reveal that the pumping rate can be increased by increasing the operational frequency of the EMV, the pressure of the externally supplied compressed air or the number of membranes. As the compressed air travels along the S-shape microchannel, it causes the membranes to deflect. The time-phased deflection of successive membranes along the microchannel length generates a peristaltic effect which drives the fluid along the microfluidic channel. The maximum attainable pumping rate is influenced by the time interval between the deflections of adjacent membranes, and is therefore affected by the geometric characteristics of the serpentine microchannel. The back pressure of the serpentine-shape micropump is measured at a fixed peak frequency to prove its ability to overcome the fluidic resistance. The optimum operating conditions and geometric parameters of the micropump are verified experimentally. It is found that the maximum pumping rate is 7.43 mu l min(-1) and is provided by a micropump with seven membranes actuated by 20 psi air pressure and 9 Hz operational frequency.