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Investigation on the correlation between solar absorption and the size of non-metallic nanoparticles

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Abstract

Solar heating with nanoparticles (NPs) exhibits great potential for photo thermal applications, such as direct absorption solar collector and photovoltaic photothermal system. The performance of NPs suspended in base fluid plays a major role in improving solar harvesting efficiency. Most researchers are focused on the optical properties of mental NPs due to their strong localized surface plasmon resonance (LSPR), resulting in a great solar absorption. To our best knowledge, theoretically and systematically studying on optical properties of non-metal NPs is still open. Therefore, we present a thorough investigation on the correlation between solar absorption and the size of CuO, carbon and graphite with the diameter range of 20–200 nm though using the finite-difference time-domain (FDTD) method. Results show that absorption and scattering cross sections of NPs have great sensitivity to particle size. The absorbed power increases with particle size growing. And solar absorption power for per unit volume of the three NPs has optimal diameter about 60 nm, 100 nm, 160 nm for carbon, graphite, and CuO, respectively. Graphite exhibits best average solar absorption efficiency, following by carbon and CuO except for particles smaller than about 30 nm. For particle diameter of 30 nm, carbon has better sunlight absorption property than that of graphite. This work aimed to provide guidelines for choosing non-metal particles and their optimal size for solar thermal utilization.

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Abbreviations

NPs:

Nanoparticles

LSPR:

Localized surface plasmon resonance

FDTD:

Finite-difference time-domain

FEM:

Finite element method

DDA:

Discrete dipole approximation

DASC:

Direct absorption solar collectors

NS:

Nanostructure

PML:

Perfectly matched layer

TFSF:

Total-field scattered-field

DFT:

Frequency-domain field profile

AM1.5:

Solar irradiance for air mass 1.5

UV:

Ultraviolet ray, < 390 nm

VIS:

Visible, 390–700 nm

NIR:

Near infrared, 700–2500 nm

E :

Electric field (kg m s−3A−1)

H :

Magnetic field (A m−1)

ε r :

Relative permittivity (m−3 kg−1 s4 A2)

μ r :

Relative permeability (kg m s−2 A−2)

P abs,P sca :

Absorption, scattering power (W)

I AM1.5 :

Standard intensity (W m−2 nm−1)

σ abs,σ sca :

Absorption, scattering section (nm2)

α :

Solar absorption ratio

\( {\overline{Q}}_{abs} \) :

Average absorption efficiency

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Funding

This research was financially supported by the National Science Foundation of China (NSFC) [Grant No. 51406098] and the State’s Key Project of Research and Development Plan of China [Grant No. 2016YFB0302000].

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Correspondence to Daming Wu or Shuangling Dong.

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The authors declare that they have no conflict of interest.

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Liu, Y., Sun, G., Wu, D. et al. Investigation on the correlation between solar absorption and the size of non-metallic nanoparticles. J Nanopart Res 21, 161 (2019). https://doi.org/10.1007/s11051-019-4576-4

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  • DOI: https://doi.org/10.1007/s11051-019-4576-4

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