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

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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 degrees 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.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2015
Language
English
Article Type
Article
Keywords

POLYMERASE-CHAIN-REACTION; DISCRETE-DIPOLE APPROXIMATION; REAL-TIME PCR; GOLD NANOPARTICLES; MICROFLUIDIC DEVICE; PICOLITER DROPLETS; FLOW LITHOGRAPHY; LIGHT-SCATTERING; QUANTUM DOTS; CHIP

Citation

ANALYST, v.140, no.5, pp.1535 - 1542

ISSN
0003-2654
DOI
10.1039/c4an01750a
URI
http://hdl.handle.net/10203/245462
Appears in Collection
ME-Journal Papers(저널논문)
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