Structural and magnetic properties of multi-core nanoparticles analysed using a generalised numerical inversion method
Journal article, 2017
The structural and magnetic properties of magnetic multi-core particles were determined by numerical inversion of small angle scattering and isothermal magnetisation data. The investigated particles consist of iron oxide nanoparticle cores (9 nm) embedded in poly(styrene) spheres (160 nm). A thorough physical characterisation of the particles included transmission electron microscopy, X-ray diffraction and asymmetrical flow field-flow fractionation. Their structure was ultimately disclosed by an indirect Fourier transform of static light scattering, small angle X-ray scattering and small angle neutron scattering data of the colloidal dispersion. The extracted pair distance distribution functions clearly indicated that the cores were mostly accumulated in the outer surface layers of the poly(styrene) spheres. To investigate the magnetic properties, the isothermal magnetisation curves of the multicore particles (immobilised and dispersed in water) were analysed. The study stands out by applying the same numerical approach to extract the apparent moment distributions of the particles as for the indirect Fourier transform. It could be shown that the main peak of the apparent moment distributions correlated to the expected intrinsic moment distribution of the cores. Additional peaks were observed which signaled deviations of the isothermal magnetisation behavior from the non-interacting case, indicating weak dipolar interactions.
Dipolar
Transformation
Ferrofluids
Light-Scattering
Interactions
Drug-Delivery
Hyperthermia
Iron-Oxide Nanoparticles
Biomedical Applications
Particle
Indirect Fourier
Small-Angle Scattering
Author
P. Bender
University of Cantabria
L. K. Bogart
University College London (UCL)
Oliver Posth
Physikalisch-Technische Bundesanstalt (PTB)
W. Szczerba
Federal Institute for Materials Research and Testing
AGH University of Science and Technology
S. E. Rogers
ISIS-STFC Neutron Scattering Facility
A. Castro
Solve Research & Consultancy
L. Nilsson
Solve Research & Consultancy
Lund University
Lunjie Zeng
Chalmers, Physics, Eva Olsson Group
A. Sugunan
SP Sveriges Tekniska Forskningsinstitut AB
J. Sommertune
SP Sveriges Tekniska Forskningsinstitut AB
A. Fornara
SP Sveriges Tekniska Forskningsinstitut AB
D. Gonzalez-Alonso
University of Cantabria
L. F. Barquin
University of Cantabria
C. Johansson
RISE Research Institutes of Sweden
Scientific Reports
2045-2322 (ISSN) 20452322 (eISSN)
Vol. 7 45990Subject Categories
Nano Technology
DOI
10.1038/srep45990