The role of particles annealing temperature on magnetorheological effect

0360529 - ÚH 2012 RIV SG eng C - Conference Paper (international conference)
Sedlačík, M. - Pavlínek, V. - Sáha, P. - Švrčinová, Petra - Filip, Petr
The role of particles annealing temperature on magnetorheological effect.
Electro-Rheological Fluids and Magneto-Rheological Suspensions. Proceedings of the 12th International Conference. Singapore: World Scientific, 2011 - (Tao, R.), s. 363-368. ISBN 978-981-4340-22-9.
[International Conference on Electro-Rheological Fluids and Magneto-Rheological Suspensions /12./. Philadelphia (US), 16.08.2010-20.08.2010]
Grant - others:GA ČR(CZ) GA202/09/1626
Program: GA
Institutional research plan: CEZ:AV0Z20600510
Keywords : cobalt ferrite * annealing process * magnetometry * magnetization
Subject RIV: BK - Fluid Dynamics

The spinel cobalt ferrite (CoFe₂O₄) nanoparticles were prepared via a sol-gel method followed by the annealing process. Their structural, magnetic and magnetorheological (MR) properties depending upon the annealing temperature were investigated. The X-ray diffraction analysis revealed that the higher annealing temperature, the larger grain size of CoFe₂O₄ particles resulting in larger magnetic domains in particles. The saturation magnetization, determined via a vibrating sample magnetometry, increased with annealing temperature and, in contrast, the coercivity decreased. The rheological behavior of CoFe₂O₄ particles based MR suspensions determined under the small-strain oscillatory shear flow in magnetic field showed that higher annealing temperature reflects in larger changes of rheological properties.
Permanent Link: http://hdl.handle.net/11104/0198048