Nanofluids with plasma treated diamond nanoparticles

In this study, diamond nanoparticles were plasma treated by glow discharges of methane and oxygen with an aim of improving their dispersion characteristics in a base fluid of water and enhancing the thermal conductivity of the resulting nanofluids. It was found that, after plasma treatment, stable nanofluids with improved thermal conductivity were obtained without using any stabilizing agents. With <0.15vol% addition of plasma treated nanoparticles into water, a 20% increase in thermal conductivity was achieved and a 5%–10% increase in both fluid density and viscosity was observed.