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Nanomaterials 2019, 9(2), 252;

Determination of Transport Properties of Glycol-Based NanoFluids Derived from Surface Functionalized Graphene

Chemistry and Physics Department, Faculty of Science, Beni-Suef University, Beni Suef 62511, Egypt
Departamento de Física Aplicada, Facultad de Ciencias, Universidade de Vigo, 36310 Vigo, Spain
Author to whom correspondence should be addressed.
Received: 22 January 2019 / Revised: 6 February 2019 / Accepted: 8 February 2019 / Published: 12 February 2019
(This article belongs to the Special Issue Layered Nano-Sheets: Synthesis and Applications)
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Suspensions of nanometric-sized graphene platelets have been proposed recently as potential heat exchange working fluids, due to their remarkably enhanced thermal profile. Nevertheless, their use presents serious long-term stability issues. Due to this limitation, the nanoplatelets surface chemical functionalization has been postulated as a promising alternative to solve this problem. In this work, graphene nanoplatelets were functionalized following an oxidation-reduction process, and then dispersed in glycol as base fluid. The nanoparticles chemical profile was determined using XPS (x-ray photoelectron spectroscopy). The thermo-physical properties characterization of these nanofluids was performed by determining their viscosity and thermal conductivity, because of their impact on practical applications related with fluid flow and heat transfer. The effect of temperature and shearing time on viscosity were analyzed. Viscosity was measured with a stress-controlled rheometer. All samples show shear-thinning behavior with a very remarkable influence of temperature in their viscoelastic profile. View Full-Text
Keywords: propylene glycol; graphene; nanofluids; viscoelasticity; thermal conductivity propylene glycol; graphene; nanofluids; viscoelasticity; thermal conductivity

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Saeed, E.; Piñeiro, M.M.; Hermida-Merino, C.; Pastoriza-Gallego, M.J. Determination of Transport Properties of Glycol-Based NanoFluids Derived from Surface Functionalized Graphene. Nanomaterials 2019, 9, 252.

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