Počet záznamů: 1
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 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Oleate-based hydrothermal preparation of CoFe2O4 nanoparticles, and their magnetic properties with respect to particle size and surface coating Tvůrce(i) Repko, A. (CZ)
Vejpravová, Jana (FZU-D) RID, ORCID
Vacková, Taťana (UMCH-V) RID
Zákutná, D. (CZ)
Nižňanský, D. (CZ)Zdroj.dok. Journal of Magnetism and Magnetic Materials. - : Elsevier - ISSN 0304-8853
Roč. 390, Sep (2015), s. 142-151Poč.str. 10 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova superparamagnetism ; size effect ; monodisperse nanocrystals ; hydrothermal synthesis ; cobalt iron oxide ; titania Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP TE01020118 GA TA ČR - Technologická agentura ČR Institucionální podpora FZU-D - RVO:68378271 ; UMCH-V - RVO:61389013 UT WOS 000355141200024 EID SCOPUS 84928682112 DOI 10.1016/j.jmmm.2015.04.090 Anotace 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. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2016
Počet záznamů: 1