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

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 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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Bender P., Bogart L., Posth O., Szczerba W., Rogers S., Castro A., Nilsson L., Zeng L., Sugunan A., Sommertune J., Fornara A., González-Alonso D., Fernández Barquín L., Johansson C.,

Editorial: Nature Publishing Group

 Fecha de publicación: 01/04/2017

Nº de páginas: 14

Tipo de publicación: Artículo de Revista

 DOI: 10.1038/srep45990

ISSN: 2045-2322

Proyecto europeo: info:eu-repo/grantAgreement/EC/FP7/604448/EU/Nanometrology Standardization Methods for Magnetic Nanoparticles/NanoMag/

Url de la publicación: https://doi.org/10.1038/srep45990

Autores/as

PHILIPP FLORIAN BENDER

BOGART, LARA KATRINA

POSTH, OLIVER

SZCZERBA, WOJCIECH

ROGERS, SARAH E.

CASTRO, ALEJANDRA

NILSSON, LARS

ZENG, LUNJIE

SUGUNAN, ABHILASH

SOMMERTUNE, JENS

FORNARA, ANDREA

DAVID GONZALEZ ALONSO

JOHANSSON, CHRISTER