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Open Access Dynamic Viscosity and Surface Tension of Stable Graphene Oxide and Reduced Graphene Oxide Aqueous Nanofluids

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This experimental work studies the effect of graphene oxide chemical reduction on the dynamic viscosity and surface tension of water-based nanofluids. Graphene oxide (GO) nanopowder was produced from commercial synthetic graphite through a derived Hummers' method and reduced graphene oxides (rGOs) were chemically reduced from GO by using various concentrations of sodium borohydride. Three different aqueous nanofluid sets were designed using GO and rGOs at nanoparticle volume concentrations ranging from 0.0005 to 0.1%. Shear flow behavior of nanofluids were obtained with a rotational rheometer at temperatures of 20.0 and 30.0 °C and surface tension of nanofluids was studied at 20.0 °C with a drop shape analyzer based on the pendant drop method. rGO nanofluids at 0.1% exhibit lower apparent viscosities and weaker shear-thinning behaviors compared to the corresponding GO nanofluids. For lower concentrations, a Newtonian behavior of nanofluids is reported. Relative viscosity enhancement of nanofluids with nanoparticle content is also modelled by Maron-Pierce's equation. Surface tension is decreased by 3% with increasing nanoadditive loading and without influence of chemical treatment. Such behavior of the prepared graphene-based nanofluids is interesting for the envisaged applications often involving circulating fluids.
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Keywords: DYNAMIC VISCOSITY; GRAPHENE OXIDE; NANOFLUID; REDUCED GRAPHENE OXIDE; SURFACE TENSION; WATER

Document Type: Research Article

Publication date: December 1, 2018

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  • Journal of Nanofluids (JON) is an international multidisciplinary peer-reviewed journal covering a wide range of research topics in the field of nanofluids and fluid science. It is an ideal and unique reference source for scientists and engineers working in this important and emerging research field of science, engineering and technology. The journal publishes full research papers, review articles with author's photo and short biography, and communications of important new findings encompassing the fundamental and applied research in all aspects of science and engineering of nanofluids and fluid science related developing technologies.
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