Počet záznamů: 1  

The magnetic and oxidation behavior of bare and silica-coated iron oxide nanoparticles synthesized by reverse co-precipitation of ferrous ion (Fe.sup.2+./sup.) in ambient atmosphere

  1. 1.
    0422566 - FZU-D 2015 RIV NL eng J - Článek v odborném periodiku
    Mahmed, N. - Heczko, Oleg - Lančok, Adriana - Hannula, S.-P.
    The magnetic and oxidation behavior of bare and silica-coated iron oxide nanoparticles synthesized by reverse co-precipitation of ferrous ion (Fe2+) in ambient atmosphere.
    Journal of Magnetism and Magnetic Materials. Roč. 353, MAR (2014), s. 15-22. ISSN 0304-8853
    Grant CEP: GA ČR(CZ) GAP107/11/0391
    Institucionální podpora: RVO:68378271
    Klíčová slova: reverseco-precipitation * ferrousion * magnetite * Mössbauer * silica
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 1.970, rok: 2014
    http://www.sciencedirect.com/science/article/pii/S0304885313007336

    The synthesis of iron oxide nanoparticles, i.e., magnetite was attempted by using only ferrous ion (Fe2+) as a magnetite precursor, under an ambient atmosphere. The room temperature reverse co-precipitation method was used, by applying two synthesis protocols. The freshly prepared iron oxide was also immediately coated with Stöber silica (SiO2) layer, forming the coreshell structure. The phase, stoichiometry, crystallite and the particle size of the synthesized powders were determined by using X-ray diffraction (XRD) and transmission electron microscope (TEM), while the magnetic and oxidation behaviors were studied by using the vibrating sample magnetometer (VSM) and Mössbauer spectroscopy. Based on the results, the bare iron oxide nanoparticles are in the stoichiometry between the magnetite and the maghemite stoichiometry, i.e., oxidation occurs. This oxidation is depending on the synthesis protocols used.
    Trvalý link: http://hdl.handle.net/11104/0228707