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.
Biomedical Applications
Ferrofluids
Dipolar
Hyperthermia
Drug-Delivery
Small-Angle Scattering
Iron-Oxide Nanoparticles
Light-Scattering
Particle
Transformation
Interactions
Indirect Fourier
Author
P. Bender
Universidad de Cantabria
L. K. Bogart
UCL
Oliver Posth
Physikalisch-Technische Bundesanstalt
W. Szczerba
Akademia Gorniczo-Hutnicza im. Stanislawa Staszica w Krakowie
Federal Institute for Materials Research and Testing Berlin
S. E. Rogers
ISIS-STFC Neutron Scattering Facility
A. Castro
SOLVE Research and Consultancy AB
L. Nilsson
Lunds Universitet
SOLVE Research and Consultancy AB
Lunjie Zeng
Chalmers, Physics, Eva Olsson Group
A. Sugunan
SP Technical Research Institute of Sweden
J. Sommertune
SP Technical Research Institute of Sweden
A. Fornara
SP Technical Research Institute of Sweden
D. Gonzalez-Alonso
Universidad de Cantabria
L. F. Barquin
Universidad de Cantabria
C. Johansson
RISE Acreo
Scientific Reports
2045-2322 (ISSN)
Vol. 7 45990Subject Categories (SSIF 2011)
Nano Technology
DOI
10.1038/srep45990