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Rapid mixing: A route to synthesize magnetite nanoparticles with high moment

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5 Author(s)
Fang, Mei ; Department of Materials Science and Engineering, Royal Institute of Technology, Stockholm, Sweden ; Strom, Valter ; Olsson, Richard T. ; Belova, Lyubov
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We demonstrate the impact of rapid mixing of the precursors in a time scale of milliseconds on the reaction rate and magnetic properties of co-precipitated magnetite with a custom-made mixer. The mixed volume is directed into a desk-top AC susceptometer to monitor the magnetic response from the growing particles in real-time. These measurements indicate that the reaction is mostly completed within a minute. The obtained superparamagnetic nanoparticles exhibit a narrow size distribution and large magnetization (87 Am2 kg-1). Transmission electron micrographs suggest that rapid mixing is the key for better crystallinity and a more uniform morphology leading to the observed magnetization values.

Published in:

Applied Physics Letters  (Volume:99 ,  Issue: 22 )

Date of Publication:

Nov 2011

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