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Open AccessArticle

The Influence of Synthesis Parameters on Structural and Magnetic Properties of Iron Oxide Nanomaterials

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National R&D Institute for Non-Ferrous and Rare Metals, INCDMNR-IMNR, 102 Biruintei blvd, Pantelimon, 077145 Ilfov, Romania
2
National Institute of Materials Physics, Atomistilor 105bis, P.O. Box MG-7, 077125 Bucharest-Magurele, Romania
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(1), 85; https://doi.org/10.3390/nano10010085
Received: 2 December 2019 / Revised: 18 December 2019 / Accepted: 23 December 2019 / Published: 2 January 2020
(This article belongs to the Section Synthesis, Interfaces and Nanostructures)
Magnetic iron oxides have been used in biomedical applications, such as contrast agents for magnetic resonance imaging, carriers for controlled drug delivery and immunoassays, or magnetic hyperthermia for the past 40 years. Our aim is to investigate the effect of pressure and temperature on the structural, thermal, and magnetic properties of iron oxides prepared by hydrothermal synthesis at temperatures of 100–200 °C and pressures of 20–1000 bar. It has been found that pressure influences the type of iron oxide crystalline phase. Thus, the results obtained by Mössbauer characterization are in excellent agreement with X-ray diffraction and optical microscopy characterization, showing that, for lower pressure values (<100 bar), hematite is formed, while, at pressures >100 bar, the major crystalline phase is goethite. In addition, thermal analysis results are consistent with particle size analysis by X-ray diffraction, confirming the crystallization of the synthesized iron oxides. One order of magnitude higher magnetization has been obtained for sample synthesized at 1000 bar. The same sample provides after annealing treatment, the highest amount of good quality magnetite leading to a magnetization at saturation of 30 emu/g and a coercive field of 1000 Oe at 10 K and 450 Oe at 300 K, convenient for various applications. View Full-Text
Keywords: iron oxide nanoparticles; hydrothermal synthesis; high pressure; magnetic properties; thermal stability iron oxide nanoparticles; hydrothermal synthesis; high pressure; magnetic properties; thermal stability
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Cursaru, L.M.; Piticescu, R.M.; Dragut, D.V.; Tudor, I.A.; Kuncser, V.; Iacob, N.; Stoiciu, F. The Influence of Synthesis Parameters on Structural and Magnetic Properties of Iron Oxide Nanomaterials. Nanomaterials 2020, 10, 85.

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    Doi: doi:10.20944/preprints201912.0036.v1
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