Synthesis of composite nanoparticles by coating magnetic spinel ferrite onto different core nanoparticles
Event details
| Date | 04.07.2013 |
| Hour | 16:15 |
| Speaker |
Prof. Darko Makovec, Jožef Stefan Institute, Ljubljana, Slovenia Bio: Scientific and Professional career: 1988 - 2002 Ceramics Department, “Jožef Stefan” Institute 2002 - Advanced Materials Department, “Jožef Stefan” Institute Position: Scientific associate Research Stay Abroad: 1.11.1995 – 30.11.1995 Institute for Inorganic Chemistry, University of Bonn, Germany. 16.9.2001 – 16.6.2002 Senior Fulbright scholar at Department of Materials Research and Engineering, University of Illinois at Urbana-Champaign, USA. Academic engagements: 2003 - associated professor at Faculty for Chemistry and Chemical Technology, University of Maribor, Slovenia. Field of reserach: material science, solid-state chemistry, high-temperature chemistry, functional ceramics, semiconducting ceramics (PTCR, varistor), ferrites, microstructural analysis, microscopy, transmission electron microscopy, HREM, microanalysis, grain-boundary engineering, phase equilibria, high temperature reactions, sintering, electromagnetic properties of functional ceramics, powder synthesis, synthesis of nanoparticles, magnetic fluids |
| Location | |
| Category | Conferences - Seminars |
In the seminar, current research at the Department of Material Synthesis, Jožef Stefan Institute, will be briefly reviewed with special focus on the materials containing magnetic nanoparticles.
The short review will be followed by the presentation on synthesis of multifunctional composite nanoparticles. The composite nanoparticles combine useful properties of different materials on a nano scale. One way to synthesize the composite nanoparticles is by coating of nanoparticles of one material by a coating of the other material. A new synthesis route yielding a magnetic spinel ferrite coating on the surface of different core nanoparticles will be presented. The formation of the coating is achieved by the heterogeneous nucleation of iron (oxo)hydroxide at the surface of the core nanoparticles with close control of the reaction kinetics during the precipitation of the M2+/Fe3+ ions (M=Fe, Co). Subsequently, the formed (oxy)hydroxide coating transforms into magnetic ferrite. The synthesis route will be presented in a case of sandwich-type nanocomposite particles, consisting of hard-magnetic, hexaferrite (BaFe12O19), core nanoparticles, and soft-magnetic, spinel maghemite (lambda-Fe2O3), shell. The spinel grows epitaxially on the structurally similar hexaferrite enabling exchange magnetic coupling between the phases.
The short review will be followed by the presentation on synthesis of multifunctional composite nanoparticles. The composite nanoparticles combine useful properties of different materials on a nano scale. One way to synthesize the composite nanoparticles is by coating of nanoparticles of one material by a coating of the other material. A new synthesis route yielding a magnetic spinel ferrite coating on the surface of different core nanoparticles will be presented. The formation of the coating is achieved by the heterogeneous nucleation of iron (oxo)hydroxide at the surface of the core nanoparticles with close control of the reaction kinetics during the precipitation of the M2+/Fe3+ ions (M=Fe, Co). Subsequently, the formed (oxy)hydroxide coating transforms into magnetic ferrite. The synthesis route will be presented in a case of sandwich-type nanocomposite particles, consisting of hard-magnetic, hexaferrite (BaFe12O19), core nanoparticles, and soft-magnetic, spinel maghemite (lambda-Fe2O3), shell. The spinel grows epitaxially on the structurally similar hexaferrite enabling exchange magnetic coupling between the phases.
Practical information
- General public
- Free
Organizer
- Hofmann Heinrich <[email protected]>
Contact
- Hofmann Heinrich <[email protected]>