Preparation of BiFeO₃ solution and its movement effects controlled by electrical field

This paper demonstrated our discovery of the movement effect of BiFeO ₃ nanoparticles in solution by strong electrical polarization. First, BiFeO₃ nanoparticles were prepared by ball milling and characterized by SEM. Then, the preparation of BiFeO₃ solution was finished. BiFeO₃ nanoparticles are found to move in solution due to electrical field. The movement velocity of BiFeO₃ nanoparticles, which is about 10 μm·s^-1, is influenced and controlled by the applied electrical field. The concentration of BiFeO₃ solution and the nanoparticle sizes also have effects on its movement properties. The movement of BiFeO₃ nanoparticles in solution is induced by strong polarization, and BiFeO₃ nanoparticles have net negative electric charges because of the electrostatic force between BiFeO₃ nanoparticles and the negative ions in water resolver.