Rapid mixing: A route to synthesize magnetite nanoparticles with high moment
2011 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 99, no 22, 222501- p.Article in journal (Refereed) Published
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 Am(2) 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.
Place, publisher, year, edition, pages
2011. Vol. 99, no 22, 222501- p.
iron compounds, magnetic moments, magnetic particles, magnetisation, mixing, nanofabrication, nanomagnetics, nanoparticles, paramagnetic materials, precipitation (physical chemistry), transmission electron microscopy
IdentifiersURN: urn:nbn:se:kth:diva-63270DOI: 10.1063/1.3662965ISI: 000298244500044ScopusID: 2-s2.0-82955164407OAI: oai:DiVA.org:kth-63270DiVA: diva2:483500
QC 201201252012-01-252012-01-232012-09-07Bibliographically approved