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Research Papers

Multifunctional Core-Shell Nanoparticle Suspensions for Efficient Absorption

[+] Author and Article Information
Rajasekaran Swaminathan

School for Engineering of Matter,
Transport and Energy,
Arizona State University, Tempe, AZ 85287

Todd P. Otanicar

Department of Mechanical Engineering,
The University of Tulsa,
Tulsa, OK 74104

Robert A. Taylor

School of Mechanical and Manufacturing Engineering,
University of New South Wales,
Sydney, NSW2032, Australia

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received April 23, 2012; final manuscript received September 23, 2012; published online November 21, 2012. Assoc. Editor: Wojciech Lipinski.

J. Sol. Energy Eng 135(2), 021004 (Nov 21, 2012) (7 pages) Paper No: SOL-12-1108; doi: 10.1115/1.4007845 History: Received April 23, 2012; Revised September 23, 2012

Nanoparticle suspensions are known to offer a variety of benefits for thermal transport and energy conversion. Of particular relevance here are the vast changes to the radiative properties due to the plasmonic nanostructures' large extinction cross section at the corresponding surface plasmon resonance (SPR) wavelength. Recent papers have showed that dielectric core/metallic shell nanoparticles yielded a plasmon resonance wavelength tunable from visible to infrared by changing the ratio of core radius to the total radius. Therefore, we are interested in developing a dispersion of core-shell multifunctional nanoparticles capable of dynamically changing their volume ratio and thus their spectral radiative properties. This paper investigates the surface plasmon resonance effect, wavelength tuning ranges for different metallic shell nanoparticles, and explores the solar-weighted efficiencies of corresponding core-shell nanoparticle suspensions. Through our electrostatic model, we estimate a red-shift in the plasmon resonance peak from a wavelength of about 600 nm to around 1400 nm for Au coated silicon core nanoparticles. Using core-shell nanoparticle dispersions, it is possible to create efficient spectral solar absorption fluids and design materials for applications which require variable spectral absorption or scattering.

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Figures

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Fig. 2

Core-shell particle geometry; εi (1,2,3) are dielectric functions for the core, shell, and embedding regions, r1, r2 the core and shell radii and r2r1 the shell thickness. Ei (1,2,3) are the electromagnetic fields in the core, the shell and the embedding media, respectively.

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Fig. 1

Dual use solar thermal collector/night sky radiator using core-shell multifunctional nanoparticle suspensions

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Fig. 3

Individual Si core Au shell core-shell nanoparticle extinction efficiency (shell thickness r2r1 = 2 nm)

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Fig. 4

For Si/Au core-shell nanoparticles, prediction of how the plasmon resonance wavelength varies with the ratio of the core radius to the total radius for shell thicknesses r2r1 = 2, 3, 5, 10 nm

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Fig. 5

Extinction coefficients σnanofluid nanofluid for water-based core-shell nanoparticle suspensions (a) Si core/Au shell, (b) Si core/Ag shell, (c) Si core/Cu shell, and (d) Si core/Al shell

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Fig. 6

Contour plot of the solar-weighted efficiency Am for the studied (a) Si core/Au shell, (b) Si core/Ag shell, (c) Si core/Cu shell, and (d) Si core/Al shell variant with core radius (3–25 nm), shell thickness (2–20 nm)

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