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Relating Magnetic Properties and High Hyperthermia Performance of Iron Oxide Nanoflowers

Bender, P. (author)
Universidad de Cantabria,University of Cantabria,Universidad de Cantabria, Spain,Univ Cantabria, E-39005 Santander, Spain.
Fock, J. (author)
Danmarks Tekniske Universitet,Technical University of Denmark,DTU Technical University of Denmark, Denmark,Tech Univ Denmark, DK-2800 Lyngby, Denmark.
Frandsen, C. (author)
Danmarks Tekniske Universitet,Technical University of Denmark,DTU Technical University of Denmark, Denmark,Tech Univ Denmark, DK-2800 Lyngby, Denmark.
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Hansen, M. F. (author)
Danmarks Tekniske Universitet,Technical University of Denmark,DTU Technical University of Denmark, Denmark,Tech Univ Denmark, DK-2800 Lyngby, Denmark.
Balceris, Christoph (author)
Technische Universität Braunschweig,TU Braunschweig, D-38106 Braunschweig, Germany.
Ludwig, Frank (author)
Technische Universität Braunschweig,TU Braunschweig, D-38106 Braunschweig, Germany.
Posth, Oliver (author)
Physikalisch-Technische Bundesanstalt (PTB),Physikalisch-Technische Bundesanstalt, Germany,Phys Tech Bundesanstalt, D-10587 Berlin, Germany.
Wetterskog, Erik (author)
Uppsala universitet,Fasta tillståndets fysik
Bogart, Lara K. (author)
University College London (UCL),University College London, UK,UCL, London W1S 4BS, England.
Southern, P. (author)
University College London (UCL),University College London, UK,UCL, London W1S 4BS, England.
Szczerba, W. (author)
Akademia Gorniczo-Hutnicza im. Stanislawa Staszica w Krakowie,AGH University of Science and Technology,Bundesanstalt für Materialforschung und -prüfung (BAM),Federal Institute for Materials Research and Testing,Bundesanstalt für Materialforschung und -prüfung, Germany; AGH University of Science and Technology, Poland,Bundesanstalt Mat Forsch & Prufung, D-12205 Berlin, Germany.;AGH Univ Sci & Technol, PL-30059 Krakow, Poland.
Zeng, Lunjie, 1983 (author)
Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden,Chalmers Univ Technol, S-41296 Gothenburg, Sweden.
Witte, Kerstin (author)
Universität Rostock,University of Rostock,University of Rostock, Germany; Micromod Partikeltechnologie GmbH, Germany,Univ Rostock, D-18059 Rostock, Germany.;Micromod Partikeltechnol GmbH, D-18119 Rostock, Germany.
Gruettner, C. (author)
Micromod Partikeltechnologie GmbH, Germany,Micromod Partikeltechnol GmbH, D-18119 Rostock, Germany.
Westphal, F. (author)
Micromod Partikeltechnologie GmbH, Germany,Micromod Partikeltechnol GmbH, D-18119 Rostock, Germany.
Honecker, Dirk (author)
Institut Laue-Langevin,Institut Laue-Langevin, France,Inst Laue Langevin, F-38042 Grenoble, France.
Gonzalez-Alonso, D. (author)
Universidad de Cantabria,University of Cantabria,Universidad de Cantabria, Spain,Univ Cantabria, E-39005 Santander, Spain.
Barquin, L. F. (author)
Universidad de Cantabria,University of Cantabria,Universidad de Cantabria, Spain,Univ Cantabria, E-39005 Santander, Spain.
Johansson, Christer (author)
RISE,Acreo,RISE Acreo, S-40014 Gothenburg, Sweden.
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 (creator_code:org_t)
2018-01-26
2018
English.
In: Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 122:5, s. 3068-3077
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We investigated, in depth, the interrelations among structure, magnetic properties, relaxation dynamics and magnetic hyperthermia performance of magnetic nanoflowers. The nanoflowers are about 39 nm in size, and consist of densely packed iron oxide cores. They display a remanent magnetization, which we explain by the exchange coupling between the cores, but we observe indications for internal spin disorder. By polarized small-angle neutron scattering, we unambiguously confirm that, on average, the nanoflowers are preferentially magnetized along one direction. The extracted discrete relaxation time distribution of the colloidally dispersed particles indicates the presence of three distinct relaxation contributions. We can explain the two slower processes by Brownian and classical Néel relaxation, respectively. The additionally observed very fast relaxation contributions are attributed by us to the relaxation of disordered spins within the nanoflowers. Finally, we show that the intrinsic loss power (ILP, magnetic hyperthermia performance) of the nanoflowers measured in colloidal dispersion at high frequency is comparatively large and independent of the viscosity of the surrounding medium. This concurs with our assumption that the observed relaxation in the high frequency range is primarily a result of internal spin relaxation, and possibly connected to the disordered spins within the individual nanoflowers.

Subject headings

NATURVETENSKAP  -- Fysik -- Annan fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Other Physics Topics (hsv//eng)
NATURVETENSKAP  -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

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