Nanoparticle dispersion by focused ultrasound from cylindrical transducer

Nanoparticles have been expected to be applied to several application fields. However one of the practical problems that should be solved is how to disperse nanoparticles purely and effectively. For pure dispersion of the nanoparticles, the methods using ultrasound have been suggested. In this study for the three different ultrasonic methods we investigated the dispersion effect under different chemical conditions of TiO₂ nanoparticle suspension. As the results, it was relatively easy to disperse when the suspension had pH 10.29, and we confirmed that using the focused ultrasound was an efficient method under all chemical conditions compared to both of the methods, ultrasonic bath and ultrasonic homogenizer.