Date of download: 12/27/2017 Copyright © ASME. All rights reserved. From: Potential Heat Transfer Fluids (Nanofluids) for Direct Volumetric Absorption-Based Solar Thermal Systems J. Thermal Sci. Eng. Appl. 2017;10(1):011009-011009-13. doi:10.1115/1.4036795 Figure Legend: Solar-weighted absorptivity (a) as a function of nanoparticle concentration for nanoparticle dispersions employing aluminum, aluminum oxide, amorphous carbon, carbon-coated cobalt, cobalt oxide, copper, MWCNTs, nickel, and silver nanoparticles, and (b) for basefluids such as distilled water, ethylene glycol, silicone oil, perfluorodecalin, propylene glycol, paraffin oil (light), and paraffin oil (heavy)