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Size analysis of single-core magnetic nanoparticles

AuthorsLudwig, F.; Balceris, C.; Viereck, T.; Posth, O.; Steinhoff, U.; Gavilán, Helena ; Costo, Rocío ; Zeng, L.; Olsson, E.; Jonasson, C.; Johansson, C.
KeywordsSingle-core nanoparticles
Size distribution
Transmission electron microscopy
Dynamic light scattering
Brownian and Néel relaxation
Issue Date1-Apr-2017
CitationJournal of Magnetism and Magnetic Materials 427: 19-24 (2017)
AbstractSingle-core iron-oxide nanoparticles with nominal core diameters of 14 nm and 19 nm were analyzed with a variety of non-magnetic and magnetic analysis techniques, including transmission electron microscopy (TEM), dynamic light scattering (DLS), static magnetization vs. magnetic field (M-H) measurements, ac susceptibility (ACS) and magnetorelaxometry (MRX). From the experimental data, distributions of core and hydrodynamic sizes are derived. Except for TEM where a number-weighted distribution is directly obtained, models have to be applied in order to determine size distributions from the measurand. It was found that the mean core diameters determined from TEM, M-H, ACS and MRX measurements agree well although they are based on different models (Langevin function, Brownian and Néel relaxation times). Especially for the sample with large cores, particle interaction effects come into play, causing agglomerates which were detected in DLS, ACS and MRX measurements. We observed that the number and size of agglomerates can be minimized by sufficiently strong diluting the suspension.
Publisher version (URL)https://doi.org/10.1016/j.jmmm.2016.11.113
Identifiersdoi: 10.1016/j.jmmm.2016.11.113
issn: 0304-8853
Appears in Collections:(ICMM) Artículos
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