Investigation of structural and magnetic changes in transformer oil-based ferrofluids induced by electric field
Dispersion of superparamagnetic nanoparticles in transformer oils constitute an extraordinary cooling and electrical insulating medium (ferrofluid) with higher breakdown voltage than those for pure transformer oils. The peculiar dielectric behavior and breakdown mechanism is still not clear. We propose to study a ferrofluid magnetization changes in relation to the particle structural reorganization brought on by an external electric field. In the proposed study it is intended to verify, if the geometrical alignment of superparamagnetic nanoparticles induced by electric forces (polarization and dielectrophoresis) also results in alignment of their magnetic moments. By the proposed experiment we would find out, if the electric field can bring superparamagnetic nanoparticles close enough in order to stop the superparamagnetic moment fluctuations and give rise to magnetic dipole-dipole interactions, forming so magnetic structures. The knowledge about such structures can shed light on the breakdown mechanism, while general relation between the electric and magnetic properties of magnetic nanoparticles can open a new avenue of ferrofluid research.
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RAJNAK Michal; HONECKER Dirk; KOPCANSKY Peter and TIMKO Milan. (2016). Investigation of structural and magnetic changes in transformer oil-based ferrofluids induced by electric field. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-32-826
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