This paper focuses on the effective dielectric constant of water-based plasmonic nanofluid containing SiO2/Ag core/shell nanoparticles (NPs). Two effective models, based on S-parameter retrieval method and Maxwell-Garnett effective medium theory, are employed. The effective dielectric constants predicted by the two effective models are compared and the applicability is evaluated by comparing the reflectance and absorptance. Three influence factors, including volume fraction, core-shell ratio, and size of NPs, are considered. Results show both of the two effective models can predict reliable effective dielectric constants when the volume fraction, size, and core-shell ratio of nanoparticles are 5%, 25 nm, and 4:1 respectively. Only small deviations appear in the resonant region under this condition. With the increase of volume fraction, shell proportion, or size, deviations in the resonant region become larger for both of the two effective models. Therefore, the predicted effective dielectric constants are not suitable for the prediction of optical properties, because the resonant region is the key region of the solar conversion for plasmonic nanofluids. Hence, the parameters of NPs need to be changed to make the effective models applicable. Moreover, the effective model based on S-parameter retrieval can predict more reliable dielectric constant than the effective model based on Maxwell-Garnett theory.
This is a preview of subscription content, log in to check access.
We thank Stéphane Larouche for his help in the modification of S-parameters.
This work was supported by the National Natural Science Foundation of China (Grant No.51476078).
Verma SK, Tiwari AK (2015) Progress of nanofluid application in solar collectors: a review. Energy Convers Manag 100:324–346CrossRefGoogle Scholar
Chen M, He Y, Zhu J, Shuai Y, Jiang B, Huang Y (2015) An experimental investigation on sunlight absorption characteristics of silver nanofluids. Sol Energy 115:85–94CrossRefGoogle Scholar
Lee BJ, Park K, Walsh T, Xu L (2012) Radiative heat transfer analysis in plasmonic nanofluids for direct solar thermal absorption. J Sol Energy Eng 134(2):021009CrossRefGoogle Scholar
Ishii S, Sugavaneshwar RP, Nagao T (2016) Titanium nitride nanoparticles as plasmonic solar heat transducers. J Phys Chem C 120(4):2343–2348CrossRefGoogle Scholar
Xuan Y, Duan H, Li Q (2014) Enhancement of solar energy absorption using a plasmonic nanofluid based on TiO2/Ag composite nanoparticles. RSC Adv 4(31):16206–16213CrossRefGoogle Scholar
Li Q, Zhang W, Zhao D, Qiu M (2014) Photothermal enhancement in core-shell structured plasmonic nanoparticles. Plasmonics 9(3):623–630CrossRefGoogle Scholar
Brosseau C (2006) Modelling and simulation of dielectric heterostructures: a physical survey from an historical perspective. J Phys D Appl Phys 39(7):1277–1294CrossRefGoogle Scholar
Sacadura J-F (2011) Thermal radiative properties of complex media: theoretical prediction versus experimental identification. Heat Transfer Eng 32(9):754–770CrossRefGoogle Scholar
Choy TC (2016) Effective medium theory: principles and applications. Oxford University PressGoogle Scholar
Ruppin R (2000) Evaluation of extended Maxwell-Garnett theories. Opt Commun 182(4–6):273–279CrossRefGoogle Scholar
Yu H, Liu D, Duan Y, Yang Z (2015) Applicability of the effective medium theory for optimizing thermal radiative properties of systems containing wavelength-sized particles. Int J Heat Mass Transf 87:303–311CrossRefGoogle Scholar
Taylor RA, Phelan PE, Otanicar TP, Adrian R, Prasher R (2011) Nanofluid optical property characterization: towards efficient direct absorption solar collectors. Nanoscale Res Lett 6:225CrossRefGoogle Scholar
Lee S, Jang SP (2013) Extinction coefficient of aqueous nanofluids containing multi-walled carbon nanotubes. Int J Heat Mass Transf 67:930–935CrossRefGoogle Scholar
Smith DR, Schultz S, Markoš P, Soukoulis CM (2002) Determination of effective permittivity and permeability of metamaterials from reflection and transmission coefficients. Phys Rev B 65:195104CrossRefGoogle Scholar
Chen X, Grzegorczyk TM, Wu BI, Pacheco J Jr, Kong JA (2004) Robust method to retrieve the constitutive effective parameters of metamaterials. Phys Rev E 70:016608CrossRefGoogle Scholar
Smith DR, Vier DC, Koschny T, Soukoulis CM (2005) Electromagnetic parameter retrieval from inhomogeneous metamaterials. Phys Rev E 71:036617CrossRefGoogle Scholar
Li SY, Niklasson GA, Granqvist CG (2011) Nanothermochromics with VO2-based core-shell structures: calculated luminous and solar optical properties. J Appl Phys 109(11):113515CrossRefGoogle Scholar
Palik DE (1985) Handbook of optical constants of solids. Academic Press Inc., LondonGoogle Scholar
Kawata S (2001) Near-field optics and surface plasmon polaritons. Springer Science & Business MediaGoogle Scholar
Johnson PB, Christy RW (1972) Optical constants of the noble metals. Phys Rev B 6:4370–4379CrossRefGoogle Scholar