Ultrafast measurement of transient electroosmotic flow in microfluidics

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• 作者：1. Biomedical Engineering Program & Department of Mechanical Engineering ; University of South Carolina ; Columbia ; SC 29208 ; USA2. State Key Lab of Modern Optical Instrumentation ; Zhejiang University ; Hangzhou ; 310027 China3. Department of Mechanical Engineering ; Clemson University ; Clemson ; SC 29634-0921 ; USA
• 关键词：Laser ; induced fluorescence photobleaching anemometer – ; LIFPA – ; DC electroosmotic flow – ; Rise time – ; Transient electrokinetic flow
• 刊名：Microfluidics and Nanofluidics
• 出版年：2011
• 出版时间：September 2011
• 年：2011
• 卷：11
• 期：3
• 页码：353-358
• 全文大小：345.8 KB
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• 作者单位：http://www.springerlink.com/content/5144174t61050x84/
• 刊物类别：Engineering
• 刊物主题：Engineering Fluid Dynamics
  Medical Microbiology
  Polymer Sciences
  Nanotechnology
  Mechanics, Fluids and Thermodynamics
  Engineering Thermodynamics and Transport Phenomena
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1613-4990

文摘

We present a non-intrusive molecular dye based method, i.e., laser-induced fluorescence photobleaching anemometer (LIFPA), to significantly increase temporal resolution (TR) for velocity measurement of fast transient electrokinetic flows. To our knowledge, the TR has been for the first time achieved to 5–10 μs, about 100 times better than that published from state-of-the-art micro particle image velocimetry (μPIV), which is currently the most widely used velocimetry in the microfluidics community. The new method provides us with new opportunities to study experimentally the fundamental phenomena of unsteady electrokinetics (EK) and to validate relevant theoretical models. One application of the new method is demonstrated by measuring the rise time of DC electroosmotic flows (EOFs) in a microcapillary of 10 μm in diameter.