Examination of Rheological Behavior of Water-Based Graphene Oxide Nanofluids
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.
Keywords
Grafen oxide nanoparticle,nanofluids,rheology,zeta potential
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