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Size and compositionally controlled manganese ferrite nanoparticles with enhanced magnetization

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Abstract

A facile solvothermal approach was used to synthesize stable, superparamagnetic manganese ferrite nanoparticles with relatively small sizes (<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 Am2/kg and from 53.3 to 60.2 Am2/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 × 105 to 4.9 × 105 J/m3, were found higher for the iron-rich samples and associated with size and composition effects.

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Acknowledgments

This research has been co-financed by the European Union (European Social Fund—ESF) and Greek national funds through the Operational Program “Education and Lifelong Learning” of the National Strategic Reference Framework (NSRF)—Research Funding Program: Thales. Investing in knowledge society through the European Social Fund. The authors would like to thank the Assoc. Prof. C. Lioutas for his great assistance in TEM analysis.

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Authors and Affiliations

  1. Department of Chemistry, Aristotle University of Thessaloniki, 54124, Thessaloníki, Greece

    K. Vamvakidis & C. Dendrinou-Samara

  2. Department of Physics, Aristotle University of Thessaloniki, 54124, Thessaloníki, Greece

    D. Sakellari & M. Angelakeris

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  1. K. Vamvakidis
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  2. D. Sakellari
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  3. M. Angelakeris
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  4. C. Dendrinou-Samara
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Correspondence to C. Dendrinou-Samara.

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Vamvakidis, K., Sakellari, D., Angelakeris, M. et al. Size and compositionally controlled manganese ferrite nanoparticles with enhanced magnetization. J Nanopart Res 15, 1743 (2013). https://doi.org/10.1007/s11051-013-1743-x

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  • DOI: https://doi.org/10.1007/s11051-013-1743-x

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