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Issue 5, 2015
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Laser-assisted photothermal heating of a plasmonic nanoparticle-suspended droplet in a microchannel

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Abstract

The present article reports the numerical and experimental investigations on the laser-assisted photothermal heating of a nanoliter-sized droplet in a microchannel when plasmonic particles are suspended in the droplet. Plasmonic nanoparticles exhibit strong light absorption and scattering upon the excitation of localized surface plasmons (LSPs), resulting in intense and rapid photothermal heating in a microchannel. Computational models are implemented to theoretically verify the photothermal behavior of gold nanoshell (GNS) and gold nanorod (GNR) particles suspended in a liquid microdroplet. Experiments were conducted to demonstrate rapid heating of a sub-100 nL droplet up to 100 °C with high controllability and repeatability. The heating and cooling time to the steady state is on the order of 1 second, while cooling requires less time than heating. The effects of core parameters, such as nanoparticle structure, volumetric concentration, microchannel depth, and laser power density on heating are studied. The obtained results can be integrated into existing microfluidic technologies that demand accurate and rapid heating of microdroplets in a microchannel.

Graphical abstract: Laser-assisted photothermal heating of a plasmonic nanoparticle-suspended droplet in a microchannel

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Publication details

The article was received on 26 Sep 2014, accepted on 19 Dec 2014 and first published on 24 Dec 2014


Article type: Paper
DOI: 10.1039/C4AN01750A
Author version available: Download Author version (PDF)
Citation: Analyst, 2015,140, 1535-1542
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    Laser-assisted photothermal heating of a plasmonic nanoparticle-suspended droplet in a microchannel

    T. Walsh, J. Lee and K. Park, Analyst, 2015, 140, 1535
    DOI: 10.1039/C4AN01750A

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