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Issue 10, 2012
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Velocity distributions in a micromixer measured by NMR imaging

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Abstract

Velocity distributions (so-called propagators) with two-dimensional spatial resolution inside a chemical micromixer were measured by pulsed-field-gradient spin-echo (PGSE) nuclear magnetic resonance (NMR). A surface coil matching the volume of interest was built to enhance the signal-to-noise ratio. This enabled the acquisition of velocity maps with a very high spatial resolution of 29 μm × 39 μm. The measured propagators are compared with theoretical distributions and a good agreement is found. The results show that the propagator data provide much richer information about flow behaviour than conventional NMR velocity imaging and the information is essential for understanding the performance of a micromixer. It reveals, for example, deviations in the shape and size of the channel structures and multicomponent flow velocity distribution of overlapping channels. Propagator data efficiently compensate lost information caused by insufficient 3D resolution in conventional velocity imaging.

Graphical abstract: Velocity distributions in a micromixer measured by NMR imaging

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Publication details

The article was received on 07 Dec 2011, accepted on 22 Feb 2012 and first published on 22 Feb 2012


Article type: Paper
DOI: 10.1039/C2LC21214E
Citation: Lab Chip, 2012,12, 1823-1830
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    Velocity distributions in a micromixer measured by NMR imaging

    S. Ahola, V. Telkki and S. Stapf, Lab Chip, 2012, 12, 1823
    DOI: 10.1039/C2LC21214E

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