用于微速度测量的发光和吸收金属涂层乳剂
Luminescent and absorptive metal-coated emulsions for micro-velocimetry
摘要：
在过去的几十年中，荧光乳胶珠已被广泛用作微流体中的示踪剂。它们具有与水密度匹配和使用荧光显微镜容易定位的优点。我们最近合成了银涂层的油滴，这是发光和吸收，首先涂层的油界面与聚多巴胺层，然后沉积银层的氧化还原过程。它们的平均直径为6 μm，通过调节金属层的厚度，它们的密度与水的密度相匹配。在这项工作中，我们使用这些颗粒作为示踪剂来测量水流在PDMS微通道中的速度分布，该微通道具有矩形横截面，这使我们能够确认斯托克斯方程的预测，其结果与常见的亚微米聚苯乙烯颗粒的结果相当。
英文摘要：
Fluorescent latex beads have been widely used as tracers in microfluidics over for the last decades. They have the advantages to be density matched with water and to be easily localizable using fluorescence microscopy. We have recently synthesized silver-coated oil droplets that are both luminescent and absorptive, by first coating the oil interface with a polydopamine layer and then depositing a silver layer by a redox process. They have a mean diameter of 6 μm and a their density has been matched to the density of water by adjusting the thickness of the metallic layer. In this work we used these particles as tracers to measure the velocity profile of a water flow in a PDMS microchannel with a rectangular cross-section, which allowed us to confirm the predictions of the Stokes equation with results comparable to those of common submicronic polystyrene particles.
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