Nanocomposite of CeO.sub.2./sub. and high-coercivity magnetic carrier with large specific surface area

0469281 - FZÚ 2017 RIV US eng J - Journal Article
Řezníčková Mantlíková, Alice - Plocek, Jiří - Pacáková, Barbara - Kubíčková, Simona - Vik, Ondřej - Nižňanský, D. - Šlouf, Miroslav - Vejpravová, Jana
Nanocomposite of CeO₂ and high-coercivity magnetic carrier with large specific surface area.
Journal of Nanomaterials. Roč. 2016, Nov (2016), s. 1-13, č. článku 7091241. ISSN 1687-4110. E-ISSN 1687-4129
R&D Projects: GA ČR(CZ) GA15-01953S; GA MŠMT(CZ) LO1507
Institutional support: RVO:68378271 ; RVO:61388980 ; RVO:61389013
Keywords : cobalt ferrite * cerium oxide * nanoparticles * catalysis
Subject RIV: BM - Solid Matter Physics ; Magnetism; CD - Macromolecular Chemistry (UMCH-V); CA - Inorganic Chemistry (UACH-T)
Impact factor: 1.871, year: 2016

We succeeded in the preparation of CoFe2O4/ CeO2 nanocomposites with very high specific surface area (up to 264 g/m2). First, highly crystalline nanoparticles (NPs) of CoFe2O4/ (4.7 nm) were prepared by hydrothermal method in water-alcohol-oleic acid system. The oleate surface coating was subsequently modified by ligand exchange to citrate. Then the NPs wereembedded in CeO2 using heterogeneous precipitation from diluted Ce3+ sulphate solution. Dried samples were characterized by Powder X-Ray Diffraction, Energy Dispersive X-Ray Analysis, Scanning and Transmission Electron Microscopy, Mössbauer Spectroscopy, and Brunauer-Emmett-Teller method. Moreover, detailed investigation of magnetic properties of the bare NPs and final composite was carried out. We have thus demonstrated that the proposed synthesis method is suitable for preparation of extremely fine CeO2 nanopowders and their nanocomposites with NPs. The morphology and magnetic nature of the obtained nanocomposites make them a promising candidate for magnetoresponsive catalysis.

Permanent Link: http://hdl.handle.net/11104/0267085