Article

Magnesium Ferrite (MgFe2O4) Nanostructures Fabricated by Electrospinning

Khon Kaen University Department of Physics, Faculty of Science, Small & Strong Materials Group (SSMG) Khon Kaen 40002 Thailand
Nanoscale Research Letters (Impact Factor: 2.48). 03/2008; 4(3):221-228. DOI: 10.1007/s11671-008-9229-y
Source: PubMed

ABSTRACT Magnesium ferrite (MgFe(2)O(4)) nanostructures were successfully fabricated by electrospinning method. X-ray diffraction, FT-IR, scanning electron microscopy, and transmission electron microscopy revealed that calcination of the as-spun MgFe(2)O(4)/poly(vinyl pyrrolidone) (PVP) composite nanofibers at 500-800 degrees C in air for 2 h resulted in well-developed spinel MgFe(2)O(4) nanostuctures. The crystal structure and morphology of the nanofibers were influenced by the calcination temperature. Crystallite size of the nanoparticles contained in nanofibers increased from 15 +/- 4 to 24 +/- 3 nm when calcination temperature was increased from 500 to 800 degrees C. Room temperature magnetization results showed a ferromagnetic behavior of the calcined MgFe(2)O(4)/PVP composite nanofibers, having their specific saturation magnetization (M(s)) values of 17.0, 20.7, 25.7, and 31.1 emu/g at 10 Oe for the samples calcined at 500, 600, 700, and 800 degrees C, respectively. It is found that the increase in the tendency of M(s) is consistent with the enhancement of crystallinity, and the values of M(s) for the MgFe(2)O(4) samples were observed to increase with increasing crystallite size.

3 Followers
 · 
180 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: Magnetically nano Fe3O4 efficiently catalyzes green oxidation of primary and secondary benzylic and aliphatic alcohols to give the corresponding carbonyl products in good yields. The reactions were carried out in an aqueous medium in the presence of hydrogen peroxide as an oxidant at 50 degrees C. In addition, the magnetically nano Fe3O4 catalyst could be reused up to four runs without any significant loss of activities. Catalyst was characterized by scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, thermogravimetric analysis, vibrating sample magnetometer, and IR.
    Green Chemistry Letters and Reviews 06/2014; 7(3):257-264. DOI:10.1080/17518253.2014.939721 · 1.22 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Nanocrystalline form of manganese ferrite (MnFe2O4) has been synthesized by simple sol-gel auto combustion method using citric acid as chelating agent. The obtained nanocrystalline powders of manganese ferrite were subjected to structural and magnetic measurements. Temperature dependent magnetization was also carried out for the single phase nanocrystalline manganese ferrite and the results have been discussed in detail.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: In this study, we successfully synthesized magnesium ferrite (MgFe2O4) nanofibers by a facile electrospinning technique followed by calcining at 800 °C. The lithium storage properties of MgFe2O4 nanofibers as anode materials for lithium-ion batteries have been discussed for the first time. It is demonstrated that MgFe2O4 nanofibers electrode not only deliver a high initial discharge capacity of around 1304 mAh g−1, but also maintain a reversible capacity of 714 mAh g−1 after 100 cycles. Moreover, the MgFe2O4 nanofibers electrode also exhibits high capacity at higher charge/discharge rate. Even at a current density of 2000 mA g−1, the reversible capacity can attain 409 mAh g−1 after 100 cycles, suggesting its excellent rate capability. The superior lithium storage properties of the MgFe2O4 nanofibers electrode may be related to the unique continuous fibrous morphologies, nanostructured architectures, porous structures, and large specific surface area, which provide an easily Li+ diffusion path and promote electron transfer. In addition, the formation of MgO appears to act as a buffer layer that prevents agglomeration of nanocrystalline, accommodate the large volume change and reduces polarization during cycling.
    Electrochimica Acta 02/2015; 160. DOI:10.1016/j.electacta.2015.02.012 · 4.09 Impact Factor

Preview (2 Sources)

Download
9 Downloads
Available from