Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 13, Issue 7, Pages 3063-3073Publisher
SPRINGER
DOI: 10.1007/s11051-010-0205-y
Keywords
Superparamagnetic materials; Nanocrystalline materials; Nanoparticles; Microemulsion
Categories
Funding
- MIUR (Ministero Istruzione Universita e Ricerca)
- Fondazione Banco di Sardegna
- RAS (Regione Sardegna - Centro regionale di Programmazione)
- PO Sardegna [L.R.7/2007]
Ask authors/readers for more resources
Mn-ferrite nanoparticles were synthesized by thermal treatment at 800 A degrees 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 multi-microemulsion 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 MnFe2O4 was observed only after thermal treatment at 800 A degrees C of the as-prepared precursors. Almost spherical nanocrystalline MnFe2O4 ranging from 12 to 39 nm was obtained starting from chlorides or mixed chloride-sulfate salts as precursors. Low values of reduced remanent magnetization (M (r)/M (s)) and coercive field (H (c)) induce to believe that a fraction of superparamagnetic particle is present at room temperature.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available