Ultrafast measurement of transient electroosmotic flow in microfluidics |
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Authors: | Cuifang?Kuang Rui?Qiao Email author" target="_blank">Guiren?WangEmail author |
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Affiliation: | (1) Biomedical Engineering Program & Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA;(2) State Key Lab of Modern Optical Instrumentation, Zhejiang University, Hangzhou, 310027, China;(3) Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921, USA; |
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Abstract: | 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. |
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Keywords: | |
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