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  • Magnetic and structural studies of ▫${\rm CoFe_2O_4}$▫ nanoparticles suspended in an organic liquid [Elektronski vir]
    Babić-Stojić, Branka ...
    We present a study of magnetic and structural properties of ▫${\rm CoFe_2O_4}$▫ nanoparticles suspended in an organic liquid. Transmission electron microscopy shows that the nanoparticles have a ... narrow size distribution of average particle size ▫$5.9 \pm 1.0~{\rm nm}$▫. X-ray diffraction shows that the particles are of cubic spinel crystal structure. Dynamic light scattering measurements reveal the existence of an organic shell around the ▫${\rm CoFe_2O_4}$▫ nanoparticles with an average hydrodynamic diameter of ▫$14.4~{\rm nm}$▫. Coercive magnetic field at ▫$T = 5~{\rm K}$▫ is found to be ▫$11.8~{\rm kOe}$▫. Disappearance of the coercive field and remanent magnetization at about ▫$170~{\rm K}$▫ suggests that the ▫${\rm CoFe_2O_4}▫ nanoparticles are superparamagnetic at higher temperatures which is confirmed by the room temperature Mössbauer spectrum analysis. Saturation magnetization of the nanoparticles of ▫$80.8~{\rm emu/g}$▫(▫${\rm CoFe_2O_4}$▫) at ▫$5~{\rm K}$▫ reaches the value detected in the bulk material and remains very high also at room temperature. The cobalt ferrite nanoparticle system synthesized in this work exhibits magnetic properties which are very suitable for various biomedical applications.
    Vir: Journal of Nanomaterials [Elektronski vir]. - ISSN 1687-4129 (Vol. 2013, Article ID 741036, 2013, str. 1-9)
    Vrsta gradiva - e-članek
    Leto - 2013
    Jezik - angleški
    COBISS.SI-ID - 16817241

    Povezava(-e):

    http://dx.doi.org/10.1155/2013/741036

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