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• W2019955225 abstract "The discrimination of immobilised superparamagnetic iron oxide nanoparticles (SPIONs) against SPIONs in fluid environments via their magnetic relaxation behaviour is a powerful tool for bio-medical imaging. Here we demonstrate that a gradiometer of laser-pumped atomic magnetometers can be used to record accurate time series of the relaxing magnetic field produced by pre-polarised SPIONs. We have investigated dry in vitro maghemite nanoparticle samples with different size distributions (average radii ranging from 14 to 21 nm) and analysed their relaxation using the Néel–Brown formalism. Fitting our model function to the magnetorelaxation (MRX) data allows us to extract the anisotropy constant K and the saturation magnetisation MS of each sample. While the latter was found not to depend on the particle size, we observe that K is inversely proportional to the (time- and size-) averaged volume of the magnetised particle fraction. We have identified the range of SPION sizes that are best suited for MRX detection considering our specific experimental conditions and sample preparation technique." @default.
• W2019955225 created "2016-06-24" @default.
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• W2019955225 date "2015-04-01" @default.
• W2019955225 modified "2023-10-15" @default.
• W2019955225 title "A quantitative study of particle size effects in the magnetorelaxometry of magnetic nanoparticles using atomic magnetometry" @default.
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• W2019955225 doi "https://doi.org/10.1016/j.jmmm.2014.12.007" @default.
• W2019955225 hasPublicationYear "2015" @default.
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