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Publikācija: Iron Oxide Nanoparticles by Precipitation from Ferrous Source: Structural Phase Transformation Dependence on Synthesis Parameters and Annealing

Publication Type Conference paper
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Iron Oxide Nanoparticles by Precipitation from Ferrous Source: Structural Phase Transformation Dependence on Synthesis Parameters and Annealing
Field of research 2. Engineering and technology
Sub-field of research 2.5 Materials engineering
Authors Andris Šutka
Santa Lagzdiņa
Tanel Käämbre
Rainer Pärna
Vambola Kisand
Gundars Mežinskis
Jānis Kleperis
Mihaels Maiorovs
Arvo Kikas
Dmitrijs Jakovļevs
Keywords Magnetite, co-precipitation, magnetic properties
Abstract Magnetite (Fe3O4) nanoparticles have found extensive scientific and technological applications, such as ferrofluids, data storage materials, photocatalysts, for water splitting under visible light, nanoparticle adsorbents for detoxication of biological fluids or removal of the heavy metals. Monophasic magnetite monodisperse nanoparticles ~30 nm in diameter were precipitated by NaOH from ferrous salt aqueous solution in air atmosphere. The influence of the solution molarity, precipitator agent drop rate and stirring time on the powder morphology, phase purity and magnetic properties was studied by using SEM, XRD, DTG, XPS, VSM and (FY)XAS analysis. Remarkable influence on grain size, morphology and phase purity was observed. XRD analysis and the comparison of Fe 2p fluorescence yield X-ray absorption spectra to reference compounds[1] shows that it is possible to obtain monophasic Fe3O4 or mixture of γ-Fe2O3, α-Fe2O3 and FeOOH with FeOOH dominance by regulating synthesis parameters. Magnetite nanoparticles shown high saturation magnetization (85.84 emu/g) and composition mainly of magnetite with little or no maghemite phase.
Hyperlink: http://fmnt.ut.ee/BookofAbstracts/FMNT-2013-Book-of-Abstracts.pdf 
Reference Šutka, A., Lagzdiņa, S., Käämbre, T., Pärna, R., Kisand, V., Mežinskis, G., Kleperis, J., Maiorovs, M., Kikas, A., Jakovļevs, D. Iron Oxide Nanoparticles by Precipitation from Ferrous Source: Structural Phase Transformation Dependence on Synthesis Parameters and Annealing. In: International Conference on Functional Materials and Nanotechnologies (FM&NT 2013): Book of Abstracts, Estonia, Tartu, 21-24 April, 2013. Tartu: University of Tartu, 2013, pp.120-120. ISBN 9789985407448.
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