Preparation and stability of Al2O3 nano-particle suspension of ammonia-water solution

► Optimal surfactants contents exist for dispersion of Al2O3 ammonia water nanofluids. ► Increasing the mass fraction of ammonia can improve the dispersion of Al2O3 nanofluids. ► Optimal dispersion condition for Al2O3 nanofluids is 0.3% PAA and 30 min supersonic vibration.