The magnetic and hyperthermia studies of bare and silica-coated La.sub.0.75./sub.Sr.sub.0.25./sub.MnO.sub.3./sub. nanoparticles

0367343 - FZÚ 2012 RIV NL eng J - Journal Article
Kaman, Ondřej - Veverka, Pavel - Jirák, Zdeněk - Maryško, Miroslav - Knížek, Karel - Veverka, Miroslav - Kašpar, P. - Burian, M. - Šepelák, V. - Pollert, Emil
The magnetic and hyperthermia studies of bare and silica-coated La_0.75Sr_0.25MnO₃ nanoparticles.
Journal of Nanoparticle Research. Roč. 13, č. 3 (2011), s. 1237-1252. ISSN 1388-0764. E-ISSN 1572-896X
R&D Projects: GA AV ČR KAN200200651
Institutional research plan: CEZ:AV0Z10100521
Keywords : perovskite manganite * magnetic nanoparticles * hyperthermia * size distribution * synthesis * nanomedicine
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.287, year: 2011

The mag. nanoparticles of La0.75Sr0.25MnO3 perovskite manganite with a controlled size were prepared via sol–gel procedure,followed by thermal treatment and subsequent mechanical processing of the resulting raw product.The prepared materials were studied by the XRD and TEMmethods and probed by DC magnetic measurements.The nanoparticles of the mean crystallite sizes 11–40 nm exhibit T in the range of ≈310–347 K and the sample possessing 20-nmcrystalliteswas identified as the most suitable for hyperthermia experiments.In order to obtain a colloidally stable suspension and prevent toxic effects, the selected magnetic cores were further encapsulated into silica shell using tetraethoxysilane.The detailed studies were focused on the comparison of the raw product,the bare nanoparticles after mechanical processing and the silica-coated nanoparticles,dealing also with effects of size distribution and magnetic interactions.
Permanent Link: http://hdl.handle.net/11104/0202058