Co-precipitation of iron oxide nanoparticles by rapid mixing
(English)Article in journal (Other academic) Submitted
Synthesis of Magnetite appears to be a topic of continued interest because of its versatility and the variety applications. Among the chemical techniques to synthesize Fe3O4, co-precipitation approach although very common, seems to be extremely sensitive to the consequences of nucleation, growth and most of all the rate of the reaction involved. This work is an attempt to demonstrate the complexities of obtaining monodispersed nanosized Fe3O4 particles. We consider the role of rapid mixing and its consequences on co-precipitation at ice-point, room temperature and boiling water temperatures on the magnetic properties of Fe3O4. We obtained crystallites varying in the range from 6.6 nm (grown in ice-water) to 7.9 nm (grown in boiling water) as determined from the broadening of XRD diffraction peaks using the Scherrer approach. With the increase of the particle size, the saturate magnetization of iron oxides increases from 52 emu/g to 63 emu/g, and the coercivity increases from 0.5 Oe to 7.9 Oe. Layers of nanosized magnetic particles on glass substrates show unusual wavelength dependence of Faraday rotation loops which show a reversal phenomenon in the sign of the magnetization around 550.
Rapid mixing co-precipitation, nanoparticles, Faraday rotation, crystallite size, magnetic property
Atom and Molecular Physics and Optics Materials Engineering
IdentifiersURN: urn:nbn:se:kth:diva-31405OAI: oai:DiVA.org:kth-31405DiVA: diva2:403604
QS 201203262011-03-142011-03-142012-03-26Bibliographically approved