Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 43: Micro- and nanostructured magnetic materials
MA 43.2: Vortrag
Donnerstag, 4. April 2019, 09:45–10:00, H52
Self-assembly of magnetic nanoparticles investigated using advanced scattering techniques — •Nileena Nandakumaran1, Mikhail Feygenson1, Lester Barnsley2, Artem Feoktystov2, and Thomas Brückel1 — 1Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science, 52425 Jülich, Germany — 2Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS at Heinz Maier-Leibnitz Zentrum MLZ, Lichtenbergstraβe 1,85748 Garching, Germany
Superparamagnetic iron oxide nanoparticles (NPs) of 20nm and 27nm were investigated using small angle neutron scattering (SANS, revealing a profound size effect of self-assembly in the larger sized nanoparticles. The particle size distribution and the core diameter were determined with Transmission electron microscopy and small angle x-ray scattering (SAXS). Magnetization measurements reveal a blocking temperature above the room temperature. SANS with polarized neutrons was used to separate the nuclear and magnetic scattering contributions for both NP sizes. The 27nm NPs form linear chains even in the zero field; SAXS and SANS data were best described by a linear pearl model. The self-assembly of 27nm NPs could be manipulated by an applied magnetic field, as clearly shown by the 2-D SANS and SAXS data. This analysis opens new perspectives and understanding of the control and manipulation of NPs to benefit a wide range of applications, including catalysis and biomedicine.