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Walsh T, Lee J, Park K. Laser-assisted photothermal heating of a plasmonic nanoparticle-suspended droplet in a microchannel. Analyst. 2015;140(5):1535-42doi: 10.1039/c4an01750a.
Walsh, T., Lee, J., & Park, K. (2015). Laser-assisted photothermal heating of a plasmonic nanoparticle-suspended droplet in a microchannel. The Analyst, 140(5), 1535-42. https://doi.org/10.1039/c4an01750a
Walsh, Timothy, et al. "Laser-assisted photothermal heating of a plasmonic nanoparticle-suspended droplet in a microchannel." The Analyst vol. 140,5 (2015): 1535-42. doi: https://doi.org/10.1039/c4an01750a
Walsh T, Lee J, Park K. Laser-assisted photothermal heating of a plasmonic nanoparticle-suspended droplet in a microchannel. Analyst. 2015 Mar 07;140(5):1535-42. doi: 10.1039/c4an01750a. PMID: 25587691.
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Analyst. 2015 Mar 07;140(5):1535-42. doi: 10.1039/c4an01750a.

Laser-assisted photothermal heating of a plasmonic nanoparticle-suspended droplet in a microchannel.

The Analyst

Timothy Walsh, Jungchul Lee, Keunhan Park

Affiliations

  1. Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island, Kingston, RI 02881, USA.

PMID: 25587691 DOI: 10.1039/c4an01750a

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.

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