Examination of Rheological Behavior of Water-Based Graphene Oxide Nanofluids
Journal Title: Cumhuriyet Science journal - Year 2017, Vol 38, Issue 4
Abstract
In this study, the rheological properties of nanofluids obtained by loading of Graphene oxide nanoparticles produced by the improved Hummers method into the deionized water base fluid in a mass fraction range of 0.1-1% were investigated. The stability analysis of the nanofluids were conducted through considering the zeta potential measurement values, and all nanofluids were determined as quite stable. Rheological measurements were carried out at 5°C, 15°C, 25°C, and 35°C with using stress-controlled rheometer. Rheological measurements were conducted for two different methods, nonlinear viscoelastic and linear viscoelastic measurements. In nonlinear viscoelastic experiments, the variation of viscosity with the shear rate of the fluid was investigated for both different nanoparticles mass fractions and a fixed constant mass fraction at different temperatures. In the second type of experiments, the elastic behavior of the fluid was determined by measuring frequency-dependent storage G ' and loss modulus G " under small oscillation shear stress. As a result of detailed rheological analysis, it was determined that water based graphene oxide nanofluids containing nanoparticles mass fractions of 0.1% shows a flow behavior that conforms to the Newton’s rule, whereas, due to the increase of graphene oxide mass fractions, the flow behavior changes to the pseudoplastic behavior that does not conform to the Newton's rule. In addition, at high graphene oxide mass fractions, it was seen that the visible viscosity decreased with the increasing temperature. As a result of the conducted linear rheological measurements, it was observed that nanofluids having high concentrated nanoparticle showed viscoelastic behavior properties.
Authors and Affiliations
Neşe KEKLİKCİOĞLU ÇAKMAK, Ümit Nazlı TEMEL, Kerim YAPICI
Keywords
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- EP ID EP488332
- DOI 10.17776/csj.358469
- Views 57
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