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Distribution functi...
Distribution functions of magnetic nanoparticles determined by a numerical inversion method
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- Bender, P. (författare)
- University of Cantabria, Spain
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- Balceris, C. (författare)
- University of Cantabria, Spain,Technical University of Braunschweig
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- Ludwig, F. (författare)
- TU Braunschweig, Germany,Technical University of Braunschweig,University of Cantabria
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- Posth, O. (författare)
- Physikalisch-Technische Bundesanstalt, Germany
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- Bogart, L. K. (författare)
- University College London, UK
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- Szczerba, W. (författare)
- Bundesanstalt für Materialforschung und -prüfung, Germany; AGH University of Science and Technology, Poland
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- Castro, A. (författare)
- SOLVE Research and Consultancy AB, Sweden
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- Nilsson, L. (författare)
- Lund University,Lunds universitet,Livsmedelsteknik,Avdelningen för livsmedel och läkemedel,Institutionen för processteknik och tillämpad biovetenskap,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Food Technology, Engineering and Nutrition,Division of Food and Pharma,Department of Process and Life Science Engineering,Departments at LTH,Faculty of Engineering, LTH,SOLVE Research and Consultancy AB
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- Costo, R. (författare)
- Instituto de Ciencia de Materiales de Madrid, Spain
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- Gavilán, H. (författare)
- Instituto de Ciencia de Materiales de Madrid, Spain
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- González-Alonso, D. (författare)
- University of Cantabria, Spain
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- Pedro, I. D. (författare)
- University of Cantabria, Spain
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- Barquin, L. F. (författare)
- University of Cantabria, Spain
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- Johansson, C. (författare)
- RISE,Acreo,RISE Acreo AB
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(creator_code:org_t)
- 2017-07-11
- 2017
- Engelska.
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Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 19:7
- Relaterad länk:
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https://doi.org/10.1...
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http://dx.doi.org/10... (free)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- In the present study, we applied a regularized inversion method to extract the particle size, magnetic moment and relaxation-time distribution of magnetic nanoparticles from small-angle x-ray scattering (SAXS), DC magnetization (DCM) and AC susceptibility (ACS) measurements. For the measurements the particles were colloidally dispersed in water. At first approximation the particles could be assumed to be spherically shaped and homogeneously magnetized single-domain particles. As model functions for the inversion, we used the particle form factor of a sphere (SAXS), the Langevin function (DCM) and the Debye model (ACS). The extracted distributions exhibited features/peaks that could be distinctly attributed to the individually dispersed and non-interacting nanoparticles. Further analysis of these peaks enabled, in combination with a prior characterization of the particle ensemble by electron microscopy and dynamic light scattering, a detailed structural and magnetic characterization of the particles. Additionally, all three extracted distributions featured peaks, which indicated deviations of the scattering (SAXS), magnetization (DCM) or relaxation (ACS) behavior from the one expected for individually dispersed, homogeneously magnetized nanoparticles. These deviations could be mainly attributed to partial agglomeration (SAXS, DCM, ACS), uncorrelated surface spins (DCM) and/or intra-well relaxation processes (ACS). The main advantage of the numerical inversion method is that no ad hoc assumptions regarding the line shape of the extracted distribution functions are required, which enabled the detection of these contributions. We highlighted this by comparing the results with the results obtained by standard model fits, where the functional form of the distributions was a priori assumed to be log-normal shaped.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- ACsusceptibility
- distribution functions
- magnetic nanoparticles
- magnetization measurements
- numerical inversion
- SAXS
- Light scattering
- Magnetic moments
- Magnetic susceptibility
- Magnetism
- Magnetization
- Nanomagnetics
- Nanoparticles
- Numerical methods
- Particle size
- X ray scattering
- Ac susceptibility
- Magnetic nano-particles
- Magnetic bubbles
- ACsusceptibility
- distribution functions
- magnetic nanoparticles
- magnetization measurements
- numerical inversion
- SAXS
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Bender, P.
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Balceris, C.
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Ludwig, F.
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Posth, O.
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Bogart, L. K.
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Szczerba, W.
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Castro, A.
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Nilsson, L.
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Costo, R.
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Gavilán, H.
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González-Alonso, ...
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Pedro, I. D.
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Barquin, L. F.
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Johansson, C.
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- NATURVETENSKAP
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New Journal of P ...
- Av lärosätet
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RISE
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Lunds universitet