A Comprehensive Physical Profile for Aqueous Dispersions of Carbon Derivatives as Solar Working Fluids

Year: 2020

Authors: Sani E., Vallejo J.P., Mercatelli L., Martina MR., Di Rosa D., Dell’Oro A., Lugo L.

Autors Affiliation: CNR, INO, Largo E Fermi 6, I-50125 Florence, Italy; Univ Vigo, Fac Ciencias, Dept Fis Aplicada, E-36310 Vigo, Spain; Univ Pisa, Dept Energy Syst Terr & Construct DESTeC, I-56122 Pisa, Italy; Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy.

Abstract: The application of nanofluids in direct solar absorption, heat transfer or direct solar steam generation entails carrying out a comprehensive study taking into account several physical quantities. Long-term stability, rheological, thermophysical and optical properties of dispersions must be known to assess their potential for envisaged applications. Two low-concentration nanofluids, 0.005 and 0.05 wt%, of sulfonic acid-functionalized and polycarboxylate chemically modified graphene nanoplatelets in water were considered in this work. Elemental analyses of the nanopowders and pH evaluations of the colloids were carried out. The rheological behaviour of dispersions at di erent temperatures was studied by rotational rheometry. Thermal conductivities were measured by the transient hot wire method and densities by the oscillating U-tube technique. Additionally, a brief report of the optical properties was included to provide a comprehensive physical analysis.

Journal/Review: APPLIED SCIENCES-BASEL

Volume: 10 (2)      Pages from: 528-1  to: 528-13

More Information: This work was partially supported by COST Action CA15119: Overcoming Barriers to Nanofluids Market Uptake (Nanouptake) in the framework of the Short-Term Scientific Mission program. This work was also partially supported by Ministerio de Economia y Competitividad (Spain) and FEDER program through ENE2017-86425-C2-1-R project. J.P.V. acknowledges FPI Program of Ministerio de Economia y Competitividad.
KeyWords: water nanofluid; graphene; solar energy; heat transfer; viscosity

DOI: 10.3390/app10020528

ImpactFactor: 2.679
Citations: 4
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