Electrical conductivity is an important
property for technological applications of nanofluids
that have not been widely investigated, and few
studies have been concerned about the electrical
conductivity. In this study, nitrogen-doped graphene
(NDG) nanofluids were prepared using the two-step
method in an aqueous solution of 0.025 wt% Triton
X-100 as a surfactant at several concentrations (0.01,
0.02, 0.04, 0.06 wt%). The electrical conductivity of
the aqueous NDG nanofluids showed a linear dependence
on the concentration and increased up to
1814.96 %for a loading of 0.06 wt% NDG nanosheet.
From the experimental data, empirical models were
developed to express the electrical conductivity as
functions of temperature and concentration. It was
observed that increasing the temperature has much
greater effect on electrical conductivity enhancement
than increasing the NDG nanosheet loading. Additionally,
by considering the electrophoresis of the
NDG nanosheets, a straightforward electrical conductivity
model is established to modulate and understand
the experimental results.
