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
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