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Issue 2, 2010
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A novel far-field nanoscopic velocimetry for nanofluidics

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Abstract

For the first time we have been able to measure the flow velocity profile for nanofluidics with a spatial resolution better than 70 nm. Due to the diffraction resolution barrier, traditional optical methods have so far failed in measuring the velocity profile in a nanocapillary or a closed nanochannel without an opened sidewall. A novel optical point measurement method is presented which applies stimulated emission depletion (STED) microscopy to laser induced fluorescence photobleaching anemometer (LIFPA) techniques to measure flow velocity. Herein we demonstrate this far-field nanoscopic velocimetry method by measuring the velocity profile in a nanocapillary with an inner diameter of 360 nm. The closest measuring point to the wall is about 35 nm. This method opens up a new class of functional measuring techniques for nanofluidics and for nanoscale flows from the wall.

Graphical abstract: A novel far-field nanoscopic velocimetry for nanofluidics

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Publication details

The article was received on 26 Aug 2009, accepted on 15 Oct 2009 and first published on 17 Nov 2009


Article type: Paper
DOI: 10.1039/B917584A
Citation: Lab Chip, 2010,10, 240-245
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    A novel far-field nanoscopic velocimetry for nanofluidics

    C. Kuang and G. Wang, Lab Chip, 2010, 10, 240
    DOI: 10.1039/B917584A

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