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@ARTICLE{Rajnak:824281,
      author       = {Rajnak, M. and Timko, M. and Kopcansky, P. and Paulovicova,
                      K. and Tothova, J. and Kurimsky, J. and Dolnik, B. and
                      Cimbala, R. and Avdeev, M. V. and Petrenko, V. I. and
                      Feoktystov, A.},
      title        = {{S}tructure and viscosity of a transformer oil-based
                      ferrofluid under an external electric field},
      journal      = {Journal of magnetism and magnetic materials},
      volume       = {431},
      issn         = {0304-8853},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ. Co.},
      reportid     = {FZJ-2016-06900},
      pages        = {99–102},
      year         = {2017},
      abstract     = {Various structural changes of ferrofluids have been
                      intensively studied under external magnetic fields. In this
                      work we present an experimental evidence of similar changes
                      induced by an electric field. In the context of the electric
                      field effect on ferrofluids structure, we studied a simple
                      ferrofluid consisting of iron oxide nanoparticles coated
                      with oleic acid and dispersed in transformer oil. The
                      structural changes have been observed both on macroscopic
                      and microscopic scale. We also demonstrate a remarkable
                      impact of the electric field on the ferrofluid viscosity in
                      relation to the reported structural changes. It was found
                      that the electric field induced viscosity changes are
                      analogous to the magnetoviscous effect. These changes and
                      the electroviscous effect are believed to stem from the
                      dielectric permittivity contrast between the iron oxide
                      nanoparticles and transformer oil, giving rise to the
                      effective electric polarization of the nanoparticles. It is
                      highlighted that this electrorheological effect should be
                      considered in studies of ferrofluids for high voltage
                      engineering applications, as it can have impact on the
                      thermomagnetic convection or the dielectric breakdown
                      performance.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2 / PGI-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)KWS1-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000399598600025},
      doi          = {10.1016/j.jmmm.2016.10.008},
      url          = {https://juser.fz-juelich.de/record/824281},
}