Optical properties of liquids for direct absorption solar thermal energy systems

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Photothermal conversion characteristics of gold nanoparticle dispersions (2014, background): “However as briefly reviewed in the Introduction, a lot of the studies were based on the optical properties and characterized by the extinction coefficient only ([2,3,4,8,9]), which makes impossible to compare the photothermal conversion efficiency.”
Review of heat transfer in nanofluids: Conductive, convective and radiative experimental results (2015, background): “Other studies have been carried out about the absorption capabilities of nanofluids for solar applications, with encouraging results [89–96].”
Performance characteristics of a residential-type direct absorption solar collector using MWCNT nanofluid (2016, background): “Water was chosen because of its higher absorbance between common solar fluids [7] and widespread use in low-temperature solar thermal collectors.”
Nanofluid-based optical filter optimization for PV/T systems (2012, positive): “Additionally, previous work of the co-authors [12–20] has shown that nanofluid mixtures can improve the performance of solar thermal systems.”