For preparing nanofluid, which one of the following methods is suitable and does not have an effect on the final stabilization of the nanofluid?
1. First we add the nanoparticles to the base fluid and then by sonication the nanoparticles get dispersed and finally the surfactant is added
2 First the nanoparticles are added to the base fluid and then the surfactant is added and finally by sonication the nanoparticles get dispersed
3. First the surfactant is added to the base fluid, then the nanoparticles are added and finally the sonication is applied