Articolo in rivista, 2020, ENG, 10.1080/01457632.2020.1818407

Effects of Carbon Nanohorn Based Nanofluids Pool Boiling on Optical Properties and Wettability of Different Metal Surfaces

Gimeno-Furio A.; Hernandez L.; Barison S.; Agresti F.; Bottaro G.; Cabaleiro D.; Doretti L.; Mancin S.

1,2: Department of Mechanical Engineering and Construction, Universitat Jaume I, Castellón de la Plana, Spain / 3,4: Institute of Condensed Matter Chemistry and Technologies for Energy, CNR-ICMATE, Padova, Italy / 5: Department of Chemical Science, CNR-ICMATE, University of Padua, Padova, Italy / 6: Construction Technologies Institute, CNR-ITC, Padova, Italy / 7: Department of Civil, Architectural and Environmental Engineering, University of Padova, Padova, Italy / 8: Department of Management and Engineering, University of Padova, Vicenza, Italy

Oxidized carbon nanohorn water based nanofluids are attracting more and more attention for solar harvesting applications because of their peculiar features: stable suspension without any surfactant, higher solar absorbance values as compared to the base fluid, etc. However, these nanofluids are still matter of research because not all their properties have been comprehensively studied yet. This paper is focused on the wettability properties of the carbon nanohorn water based nanofluids on different metal surfaces. The static contact angle was measured for ten nanofluids with concentrations ranging from 0.002%wt to 0.1% wt, five of those used non-oxidized carbon nanohorns while the other five used oxidized carbon nanohorns. Moreover, this work investigates a novel use of the oxidized carbon nanohorn nanofluids to deposit an ultra-thin layer via pool boiling. The realized coating was proved to be stable and found to slightly affect the wettability of the nanofluids. Finally, the solar reflectance of the coated aluminum sample was measured and found to be from 2 to 10 times lower as compared to a reference aluminum surface.

Heat transfer engineering (Online)

Keywords

CRITICAL HEAT-FLUX, CONTACT-ANGLE, NANOPARTICLES, ENHANCEMENT, DEGRADATION, OXIDATION

CNR authors

Barison Simona, Bottaro Gregorio, Agresti Filippo

CNR institutes

ICMATE – Istituto di Chimica della Materia Condensata e di Tecnologie per l'Energia

ID: 435957

Year: 2020

Type: Articolo in rivista

Creation: 2020-11-13 11:59:01.000

Last update: 2022-03-08 10:32:34.000

External IDs

CNR OAI-PMH: oai:it.cnr:prodotti:435957

DOI: 10.1080/01457632.2020.1818407

Scopus: 2-s2.0-85091001669

ISI Web of Science (WOS): 000569997700001