Microfluidic Pumps with Laser Streaming from Tips of Optical Fibers and Sewing Needles
Microfluidic Pumps with Laser Streaming from Tips of Optical Fibers and Sewing Needles
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DOI：
10.1002/adom.202201534
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发表时间：
2022-10-09
影响因子：
9
通讯作者：
Bao, Jiming
中科院分区：
文献类型：
--
作者：
Tong, Tian;Yue, Shuai;Bao, Jiming
光声激光流的发现开辟了一条用光操纵和驱动流体的新途径，但由于尺寸限制和制造的复杂性，原位"发射台"的必要性限制了其在现实世界微流体应用中的实用性。这里，证明了1）可以通过使用来自光纤的激光流来实现通用微流体泵，以及2）可以在没有任何制造工艺的情况下从平坦金属表面产生激光流。在后一种情况下，通过将激光聚焦在缝纫针尖端的尖端上，针可以变成具有可控流动方向的微型泵。此外，通过对流体运动的高速成像和计算流体动力学模拟，证实了激光流的光声原理，并揭示了激光流的方向取决于发散超声波阵面中最强强度的方向。最后，通过成功地驱动毛细管内的流体，证明了激光流用于微流体和光流体应用的潜力。
The discovery of photoacoustic laser streaming has opened up a new avenue to manipulate and drive fluids with light, but the necessity of an in situ "launch pad" has limited its utility in real-world microfluidic applications due to both the size constraint and the complexity of fabrication. Here, it is demonstrated that 1) a versatile microfluidic pump can be materialized by using laser streaming from an optical fiber, and 2) laser streaming can be generated from a flat metal surface without any fabrication process. In the latter case, by focusing laser on the tip of a sewing needle tip, the needle can be turned into a micropump with controllable flow direction. Additionally, high-speed imaging of the fluid motion and computational fluid dynamics simulations to confirm the photoacoustic principle of laser streaming are employed, and it is revealed that the streaming direction is determined by the direction of strongest intensity in the divergent ultrasound wavefront. Finally, the potential of laser streaming for microfluidic and optofluidic applications is demonstrated by successfully driving fluid inside a capillary tube.