J. Phys. IV France 07 (1997) C1-581-C1-582
Ultrasound Enhanced Ferrite PlatingY. Kitamoto, M. Zhang, S. Haijima, K. Matsumoto and M. Abe
Department of Physical Electronics, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan
This paper is the first report of sonochemistry (or application of power ultrasound to stimulate chemical processes in liquids) combined with ferrite plating - a wet chemical method to synthesize ferrite films from aqueous solution. Due to the ultrasonic enhancement, we have successfully encapsulated polyacrylate spheres, ~0.25µm in diameter, with magnetite in a aqueous solution of FeCl2, at 65°C. This broke through the lower limit (~0.3µm) of the size of the particles to be encapsulate with magnetite without applying the ultrasound waves. The magnetite coating has magnetization (92emu/g) which is the same value as that reported for bulk samples, being increased from that (65emu/g) obtained without the ultrasonic enhancement.
© EDP Sciences 1997