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The addition of highly conductive substance such as carbon nanotubes into a   traditional heat transfer fluid will enhance the fluids’ thermal   conductivity. However, dispersion process of carbon nanotubes into base   fluids is not an easy task due to hydrophobic characteristic of its surface.   This study attempts to investigate the stability and thermal conductivity of   carbon nanotube based ethylene glycol/water nanofluids with and without   surfactants. Stability investigation was conducted through observation and   zeta potential measurement methods. As for the thermal conductivity, the   samples were measured based on transient line heat source. The results   showed that 0.01 wt.% of carbon nanotube based nanofluid, containing   0.01wt.% hexadecyltrimethylammonium bromide possess highest zeta potential   value compared to the other tested samples. 0.5 wt. % of carbon nanotube   based nanofluids with gum arabic exhibit 25.7% thermal conductivity   enhancement

The effect of surfactant on stability and thermal conductivity of carbon nanotube based nanofluids