Thermo-physical and stability properties of raw and functionalization of graphene nanoplatelets-based aqueous nanofluids.

Autor: Akbari, Amir, Alavi Fazel, Seyed Ali, Maghsoodi, Sarah, Shahbazi Kootenaei, Amirhossein
Předmět:
Zdroj: Journal of Dispersion Science & Technology; 2019, Vol. 40 Issue 1, p17-24, 8p, 2 Diagrams, 1 Chart, 9 Graphs
Abstrakt: This research aimed to evaluate the thermal viscosity, stability, conductivity and density of coolants including PEG-functionalized graphene nanoplatelets (GNPs) and gum Arabic (GA)-treated GNPs as a base fluid at various temperatures and concentrations. The present study explores the impacts of GNPs functionalized with poly ethylene glycol (PEG) on the colloidal stability and thermophysical properties of water-based PEG-functionalized GNPs suspensions as a new generation of heat transfer fluids. To this end, PEG-functionalized GNPs as a covalent sample and GA-treated GNPs were synthesized and their colloidal stabilities were traced via UV-vis spectrometry. After functionalized, colloidal stability results indicate less sedimentation for covalent samples (less than 10%) that that of noncovalent one (almost 20%) after a 15-day period. In addition, all the thermophysical properties e.g. thermal conductivity, density and viscosity were measured experimentally. Further, it has shown that by loading PEG-functionalized GNPs in the water, the increasing rate of the density and viscosity is not significant, while water-based GA-treated GNPs nanofluids showed higher rates of increase. Interestingly, the water-based PEG-functionalized GNP nanofluids at very low concentration significantly increase the thermal conductivity in comparison with that of non-covalent nanofluid at the same concentration and temperature and defiantly water. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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