Injecting a room-temperature liquid metal into microchannels offers a simple, rapid, and low-cost method of fabricating microfluidic electrodes. In this work, these electrodes are used to develop a multichannel electroosmotic flow pump for high-flow-rate microfluidic bio analysis applications. In this pump, two identical square-wave shaped liquid metal electrodes were located at both ends of pumping channels on the same horizontal level, and were separated by polydimethylsiloxane gaps from the pumping channels. To test the pumping performance, fluorescent particles were diluted with deionized water and injected into the pumping channels to measure the flow velocity. The results show that the pump with five parallel pumping channels can drive water at a speed of 4.63–45.76 μm/s with applied voltage of 300–1000 V, when the pumping channels are 30 μm high, and 250 μm long with 30-μm polydimethylsiloxane gaps. It can reach its highest possible flow rate of 325 nl/min when the applied voltage reaches its limit 3900V (150 μm long pumping channels, 150 μm long nonpumping channels and 30 μm PDMS gap with 10 parallel pumping channels). This EOF pump should be potential in many high-flow-rate microfluidic applications.

中文翻译：

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使用液态金属电极的多通道电渗流泵

将室温液态金属注入微通道可提供一种简单，快速且低成本的制造微流体电极的方法。在这项工作中，这些电极用于开发多通道电渗流泵，用于高流速微流体生物分析应用。在该泵中，两个相同的方波状液态金属电极在相同水平面上位于泵通道的两端，并通过聚二甲基硅氧烷间隙与泵通道隔开。为了测试泵浦性能，将荧光粉用去离子水稀释并注入泵浦通道中以测量流速。结果表明，具有五个平行泵送通道的泵在施加电压300-1000 V时可以以4.63-45.76μm/ s的速度驱动水，当泵浦通道的高度为30μm，长度为250μm，聚二甲基硅氧烷间隙为30μm时。当施加的电压达到其极限3900V（150μm长的泵浦通道，150μm长的非泵浦通道和30μmPDMS间隙与10个平行泵浦通道）时，它可以达到325 nl / min的最高流速。这种EOF泵在许多高流速微流体应用中应该具有潜力。