Mn-ferrite nanoparticles were synthesized by thermal treatment at 800 °C of manganese and iron oxo-hydroxides obtained via water-in-oil microemulsions consisting of n-hexanol as continuous phase, cetyl trimethyl ammonium bromide (CTAB) as the cationic surfactant and aqueous solutions of metal salts and precipitant agent (tetramethyl ammonium hydroxide) as reagents. Nanoparticles were synthesized using a multimicroemulsion approach.Two different co-precipitation routes are described depending on the Fe(II) or Fe(III) precursor salts. The influence of salt concentration and digestion process on the final products was examined. The nanoparticles were characterized by X-ray diffraction accompanied by Rietveld analysis, transmission electron microscopy, thermal analysis, infrared spectroscopy, and SQUID magnetometry. In all the synthesis reported in this study MnFe2O4was observed only after thermal treatment at 800 °C of the as-prepared precursors. Almost spherical nanocrystallineMnFe2O4ranging from 12 to 39 nmwas obtained starting from chlorides or mixed chloride-sulfate salts as precursors. Low values of reduced remanent magnetization (Mr/Ms) and coercive field (Hc) induce to believe that a fraction of superparamagnetic particle is present at room temperature. © Springer Science+Business Media B.V. 2010.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Modelling and Simulation
- Materials Science(all)
- Condensed Matter Physics
Scano, A., Ennas, G., Frongia, F., La Barbera, A., López-Quintela, M. A., Marongiu, G., ... Vázquez-Vázquez, C. (2011). Mn-ferrite nanoparticles via reverse microemulsions: Synthesis and characterization. Journal of Nanoparticle Research, 13(7), 3063 - 3073. https://doi.org/10.1007/s11051-010-0205-y