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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Venkatesha, N. Qurishi, Yasrib Atreya, Hanudatta S. Srivastava, Chandan |
| Copyright Year | 2016 |
| Abstract | 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 CoFe2O4–MnFe2O4 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, CoFe2O4 seed nanoparticles were synthesized and in the second step a MnFe2O4 phase was grown over seed CoFe2O4 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 CoFe2O4, MnFe2O4 and CoFe2O4–MnFe2O4 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. |
| Starting Page | 64605 |
| Ending Page | 64610 |
| Page Count | 6 |
| File Format | HTM / HTML PDF |
| ISSN | 20462069 |
| Volume Number | 6 |
| Issue Number | 69 |
| Journal | RSC Advances |
| DOI | 10.1039/c6ra11016a |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Diffraction Transmission electron microscopy Nanoparticle Proton Superparamagnetism Nuclear magnetic resonance Photoemission spectroscopy X-ray photoelectron spectroscopy Molecular geometry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Chemical Engineering |
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