Figure 6.
Zeta potential value of SnO2/rGO composite, rGO, and SnO2 nanofluids with different concentration; (a) 0.04 wt % and (b) 0.06% insets are photographs of rGO, SnO2/rGO, and SnO2 nanofluids after quiescence for 30 days.
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