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Effect of core-shell nanoparticle geometry on the enhancement of the proton relaxivity value in a nuclear magnetic resonance experiment

Venkatesha, N ; Qurishi, Yasrib ; Atreya, Hanudatta S ; Srivastava, Chandan

RSC advances, 2016-01, Vol.6 (69), p.6465-6461 [Periódico revisado por pares]

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  • Título:
    Effect of core-shell nanoparticle geometry on the enhancement of the proton relaxivity value in a nuclear magnetic resonance experiment
  • Autor: Venkatesha, N ; Qurishi, Yasrib ; Atreya, Hanudatta S ; Srivastava, Chandan
  • Assuntos: Diffraction ; Formations ; Inhomogeneity ; Nanoparticles ; Nanostructure ; Nuclear magnetic resonance ; Seeds ; X-rays
  • É parte de: RSC advances, 2016-01, Vol.6 (69), p.6465-6461
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
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  • Descrição: This work illustrates the effect of core-shell nanoparticle geometry on the enhancement of the proton relaxivity value in a nuclear magnetic resonance experiment. Chemically synthesized CoFe 2 O 4 -MnFe 2 O 4 core-shell nanoparticles were chosen as a candidate material. A two step methodology was used to synthesize the core-shell nanoparticles. In the first step, CoFe 2 O 4 seed nanoparticles were synthesized and in the second step a MnFe 2 O 4 phase was grown over seed CoFe 2 O 4 nanoparticles to form the core-shell geometry. Characterization of the as-synthesized nanoparticles by diffraction methods, electron microscopy and X-ray photoelectron spectroscopy confirmed the formation of uniform core-shell nanoparticles. Magnetic measurement revealed the superparamagnetic nature of the as-synthesized core-shell nanoparticles. The transverse proton relaxivity values obtained by the nuclear magnetic resonance experiment conducted at room temperature using a field of 9.4 T in the presence of single phase CoFe 2 O 4 , MnFe 2 O 4 and CoFe 2 O 4 -MnFe 2 O 4 core-shell nanoparticles were 60.9 mM −1 s −1 , 83.2 mM −1 s −1 and 194.8 mM −1 s −1 respectively. This result clearly illustrated that a greater magnetic inhomogeneity induced in the medium surrounding the core-shell nanoparticles containing two different magnetic phases yields the highest value for the transverse proton relaxivity. This work illustrates the effect of core-shell nanoparticle geometry on the enhancement of the proton relaxivity value in a nuclear magnetic resonance experiment.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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