Fabrication of Al2O3 nanofluid by a plasma arc nanoparticles synthesis system

This paper describes the synthesis of Al2O3 nanofluid with high suspension stability using a modified plasma arc system. This system uses high temperature produced by plasma arc system to cause the bulk metal to heat and vaporize. The vaporized metallic gas is inducted into the collection piping by the induction system. At the same time, it mixes thoroughly with the pre-condensed deionized water, and the mixture then undergoes a rapid cooling process which helps in grain nucleation and prevents the growth of particle size. Hence, a nanofluid with smaller particle size can be obtained, and this is finally stored in the collection tank. The suspension stability of the Al2O3 nanofluid with different pH values was analyzed via Zeta potential. The absorption properties of the Al2O3 nanofluid were analyzed using UV–Vis spectrophotometer. Moreover, the fuel calorific test shows that the combustion efficiency of 92 octane unleaded gas was greater when the weight concentration of the Al2O3 nanofluids was 3%.