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Oleate-based hydrothermal preparation of CoFe.sub.2./sub.O.sub.4./sub. nanoparticles, and their magnetic properties with respect to particle size and surface coating
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SYSNO ASEP 0448155 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Oleate-based hydrothermal preparation of CoFe2O4 nanoparticles, and their magnetic properties with respect to particle size and surface coating Author(s) Repko, A. (CZ)
Vejpravová, Jana (FZU-D) RID, ORCID
Vacková, Taťana (UMCH-V) RID
Zákutná, D. (CZ)
Nižňanský, D. (CZ)Source Title Journal of Magnetism and Magnetic Materials. - : Elsevier - ISSN 0304-8853
Roč. 390, Sep (2015), s. 142-151Number of pages 10 s. Language eng - English Country NL - Netherlands Keywords superparamagnetism ; size effect ; monodisperse nanocrystals ; hydrothermal synthesis ; cobalt iron oxide ; titania Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects TE01020118 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Institutional support FZU-D - RVO:68378271 ; UMCH-V - RVO:61389013 UT WOS 000355141200024 EID SCOPUS 84928682112 DOI 10.1016/j.jmmm.2015.04.090 Annotation hydrolysis of Co-Fe oleate in the presence of pentanol/octanol/toluene and water. The particle size (6 – 10 nm) was controlled by the composition of the organic solvent and temperature. Magnetic properties were then investigated with respect to the particle size and surface modification with citric acid or titanium dioxide. The as-prepared hydrophobic nanoparticles (coated by oleic acid) had a minimum inter-particle distance of 2.5 nm. Their apparent blocking temperature was 180 K, 280 K and 330 K for the particles with size of 6, 9 or 10.5 nm,respectively. Replacement of oleic acid on the surface by citric acid decreased inter-particle distance to less than 1 nm, and increased blocking temperature by ca. 10 K. Coating with titanium dioxide, supported by nitrilotri(methylphosphonic acid), caused increase of the particle spacing, and lowering of the blocking temperature by ca. 20 K. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2016
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