Titania-coated manganite nanoparticles: synthesis of the shell, characterization and MRI properties

0473952 - FZÚ 2018 RIV NL eng J - Journal Article
Jirák, Zdeněk - Kuličková, Jarmila - Herynek, Vít - Maryško, Miroslav - Koktan, Jakub - Kaman, Ondřej
Titania-coated manganite nanoparticles: synthesis of the shell, characterization and MRI properties.
Journal of Magnetism and Magnetic Materials. Roč. 427, Apr (2017), s. 245-250. ISSN 0304-8853. E-ISSN 1873-4766
R&D Projects: GA ČR GA15-10088S; GA ČR GA16-04340S
Institutional support: RVO:68378271 ; RVO:68378041
Keywords : magnetic nanoparticles * core-shell nanoparticles * titania coating * perovskite manganite * magnetic resonance imaging * transverse relaxivity
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.046, year: 2017

Novel procedure for coating of oxide nanoparticles with titania is developed and applied to magnetic cores of perovskite manganite. Bare particles of the ferromagnetic La0.65Sr0.35MnO3 phase, possessing high magnetization, M10 kOe(4.5 K) = 63.5 emu g-1, and Curie temperature, TC = 355 K, are synthesized by sol-gel procedure and subsequently coated with titania. Further, a comparative silica-coated product is prepared. In order to analyse the morphology, colloidal stability, and surface properties of these two types of coated particles, a detailed study by means of TEM, DLS, zeta-potential measurements, and IR spectroscopy is carried out. The experiments on the titania-coated sample reveal a continuous though porous character of the TiO2 shell. Finally, the relaxometric study at the magnetic field of 0.5 T, performed to quantity the transverse relaxivity and its temperature dependence, reveals important differences between the titania-coated and silica-coated nanoparticles.
Permanent Link: http://hdl.handle.net/11104/0271050