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ZnxFe3−xO4 (0.01 ≤ x ≤ 0.8) nanoparticles for controlled magnetic hyperthermia application

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Abstract

The ferrofluids based on ZnxFe3−xO4 (0.01 ≤ x ≤ 0.8) nanoparticles have shown stabilization near therapeutic temperature (∼42 °C) in the presence of external AC magnetic fields similar to that of tetravalent ion substituted magnetites. These nanoparticles were prepared using microwave refluxing technique. Rietveld analysis of X-ray diffraction patterns of the as prepared samples confirmed their single phase mixed spinel type structure. It further suggests that all the Zn2+ ions occupy tetrahedral voids. The spherical shaped particles had sizes in the range of 3–10 nm, as observed under transmission electron microscopy. X-ray photoelectron spectra have confirmed the presence of Fe2+, Fe3+ and Zn2+ ions in the samples. The Zn0.2Fe2.8O4 sample displayed the highest saturation magnetization value (∼65 A m2 kg−1) amongst all the samples. As the concentration of Zn increased, beyond x > 0.3, the value of saturation magnetization continuously diminished due to the dominance of the nonmagnetic ion. Fe2+ ions occupying both the sites was confirmed from room temperature Mössbauer spectroscopy.

Graphical abstract: ZnxFe3−xO4 (0.01 ≤ x ≤ 0.8) nanoparticles for controlled magnetic hyperthermia application

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Publication details

The article was received on 31 Jan 2018, accepted on 23 Mar 2018 and first published on 26 Mar 2018


Article type: Paper
DOI: 10.1039/C8NJ00547H
Citation: New J. Chem., 2018, Advance Article
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    ZnxFe3−xO4 (0.01 ≤ x ≤ 0.8) nanoparticles for controlled magnetic hyperthermia application

    M. Srivastava, S. K. Alla, S. S. Meena, N. Gupta, R. K. Mandal and N. K. Prasad, New J. Chem., 2018, Advance Article , DOI: 10.1039/C8NJ00547H

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