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Preparation of Mn-Zn ferrite nanoparticles and their silica-coated clusters: magnetic properties and transverse relaxivity
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SYSNO ASEP 0473986 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Preparation of Mn-Zn ferrite nanoparticles and their silica-coated clusters: magnetic properties and transverse relaxivity Author(s) Kaman, Ondřej (FZU-D) RID, ORCID
Kuličková, Jarmila (FZU-D) ORCID
Herynek, Vít (UEM-P)
Koktan, Jakub (FZU-D) RID
Maryško, Miroslav (FZU-D) RID
Dědourková, T. (CZ)
Knížek, Karel (FZU-D) RID, ORCID
Jirák, Zdeněk (FZU-D) RID, ORCID, SAINumber of authors 8 Source Title Journal of Magnetism and Magnetic Materials. - : Elsevier - ISSN 0304-8853
Roč. 427, Apr (2017), s. 251-257Number of pages 7 s. Language eng - English Country NL - Netherlands Keywords magnetic nanoparticles ; Mn-Zn ferrite ; hydrothermal synthesis ; magnetic resonance imaging ; transverse relaxivity Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) Institutional support FZU-D - RVO:68378271 ; UEM-P - RVO:68378041 UT WOS 000397199400045 EID SCOPUS 85005996235 DOI https://doi.org/10.1016/j.jmmm.2016.10.095 Annotation Hydrothermal synthesis of Mn1-xZnxFe2O4 nanoparticles followed by direct encapsulation of the material into silica is demonstrated as a fast and facile method for preparation of efficient negative contrast agents based on clusters of ferrite crystallites. At first, magnetic nanoparticles of Mn-Zn ferrites in the compositional range of x≈0.2-0.6 and with XRD≈10 nm are prepared. The products are characterized by XRD, XRF, and SQUID magnetometry, and the composition x=0.4 is selected for the preparation of silica-coated clusters. Their composite structure is studied by means of TEM combined with detailed image analysis and magnetic measurements. The relaxometric studies reveal high transverse relaxivity with a pronounced temperature dependence, which correlates with the observed temperature dependence of magnetization and is ascribed to a mechanism of transverse relaxation similar to the motional averaging regime.
Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2018
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