A simple micro check valve using a photo-patterned hydrogel valve core
A simple micro check valve using a photo-patterned hydrogel valve core
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DOI：
10.1016/j.sna.2020.111878
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发表时间：
2020-04
影响因子：
4.6
通讯作者：
Yingzhe Wang;Kazuma Toyoda;Kaoru Uesugi;K. Morishima
中科院分区：
文献类型：
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作者：
Yingzhe Wang;Kazuma Toyoda;Kaoru Uesugi;K. Morishima
微型止回阀在许多微流体系统中起着关键作用。然而，对于具有良好性能和容易集成的低成本止回阀的需求仍然没有得到满足。在这项工作中，我们提出了一个平面微止回阀使用的水凝胶阀芯fabricatedin原位微通道。该阀的特点是制造工艺简单，易于与其他微流体装置集成。实验结果表明，该单向阀的性能优于现有的面内微型单向阀，特别是在低压工况下，其正向开启压力和反向泄漏几乎为零，正向流体阻力可调，重复性好。我们进一步提出了一种开启压力可控的常闭止回阀，以满足微流控器件的不同要求。通过调节气门弹簧宽度可以获得精确的开启压力。为了证明阀门的有效性，我们使用这些阀门制造了手指驱动的微型混合器和生物驱动的微型泵。该研究使得集成微流控系统中的流量控制更加简单。
Micro check valves play a pivotal role in many microfluidic systems. However, there is still an unmet need for low-cost check valves with good performance and easy integration. In this work, we present a planar micro check valve using a hydrogel valve core fabricatedin situin a microchannel. This valve is characterized by a simple fabrication process and easy integration with other microfluidic devices. Experimental results proved that the check valve performs better than most existing in-plane micro check valves, especially in low-pressure operations, with nearly zero forward cracking pressure and reverse leakage, adjustable forward fluidic resistance, and good repeatability. We further proposed a normally-closed check valve with controllable cracking pressure to meet different requirements of microfluidic devices. Precise cracking pressures could be achieved by regulating the valve spring width. To demonstrate the valve usefulness, we employed these valves to make a finger-actuated micro-mixer and a bio-actuated micro-pump. This study makes the flow control more simplified in integrated microfluidic systems.