抄録
The nanoparticles of various metal such as Pt, Au, Pd, etc. can be easily by ultrasonic irradiation. This study was conducted to prepare MnO_2 nanoparticles from potassium permanganate solutions with various concentration of three different surface-active agents by ultrasound. The amount of MnO_2 and MnO_4^- ions were measured as a function of irradiation time by using the spectrophotometer. The experimental conditions of sonication were as follows; frequency 200kHz, output power 200W, bulk temperature 293K. On the basis of the results obtained, the roles of surface-active agents and H radicals were discussed in terms of the formation rate of MnO_2 and reduction rate of MnO_4^-.
