Size and compositionally controlled manganese ferrite nanoparticles with enhanced magnetization

作者：Vamvakidis K; Sakellari D; Angelakeris M; Dendrinou Samara C^*

来源：Journal of Nanoparticle Research, 2013, 15(6): UNSP 1743.

DOI：10.1007/s11051-013-1743-x

• Manganese ferrite nanoparticles
• Superparamagnetic nanoparticles
• Solvothermal synthesis
• Spinel structure

A facile solvothermal approach was used to synthesize stable, superparamagnetic manganese ferrite nanoparticles with relatively small sizes (%26lt;10 nm) and enhanced magnetic features. Tetraethylene glycol has been used in all the syntheses as a biocompatible and stabilizing agent. By varying the oxidation state of manganese precursor, Mn(acac)(2) to Mn(acac)(3), different sizes, 8 and 5 nm, of MnFe2O4 nanoparticles were obtained respectively, while by tailoring the synthetic conditions iron-rich Mn0.77Fe2.23O4 nanoparticles have been isolated with identical sizes and enhanced saturation magnetization. The magnetization values increased from 58.2 to 68.3 Am-2/kg and from 53.3 to 60.2 Am-2/kg for the nanoparticles of 8 and 5 nm, respectively. Blocking temperature (T-B), ranging from 80 to 180 K, and anisotropy constant (K-eff), ranging from 1.5 x 10(5) to 4.9 x 10(5) J/m(3), were found higher for the iron-rich samples and associated with size and composition effects.

• 出版日期2013-6-4