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Structural and magnetic properties of multi-core nanoparticles analysed using a generalised numerical inversion method

ten Hoope-Bender, P; Bogart, L. K.; Posth, O.; Szczerba, W.; Rogers, Sarah E.; Castro, A. LU ; Nilsson, L. LU ; Zeng, L. J.; Sugunan, A. and Sommertune, J., et al. (2017) In Scientific Reports 7.
Abstract

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... (More)

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 multi-core 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.

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type
Contribution to journal
publication status
published
subject
in
Scientific Reports
volume
7
publisher
Nature Publishing Group
external identifiers
  • scopus:85017457020
  • wos:000398824700001
ISSN
2045-2322
DOI
10.1038/srep45990
language
English
LU publication?
yes
id
a19e7834-cd58-4b5e-a82b-783b39e3acfe
date added to LUP
2017-05-08 12:41:45
date last changed
2018-10-03 11:53:16
@article{a19e7834-cd58-4b5e-a82b-783b39e3acfe,
  abstract     = {<p>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 multi-core 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.</p>},
  articleno    = {45990},
  author       = {ten Hoope-Bender, P and Bogart, L. K. and Posth, O. and Szczerba, W. and Rogers, Sarah E. and Castro, A. and Nilsson, L. and Zeng, L. J. and Sugunan, A. and Sommertune, J. and Fornara, A. and González-Alonso, D. and Fernández Barquín, L. and Johansson, C.},
  issn         = {2045-2322},
  language     = {eng},
  month        = {04},
  publisher    = {Nature Publishing Group},
  series       = {Scientific Reports},
  title        = {Structural and magnetic properties of multi-core nanoparticles analysed using a generalised numerical inversion method},
  url          = {http://dx.doi.org/10.1038/srep45990},
  volume       = {7},
  year         = {2017},
}