Abstract
The results of proton nuclear magnetic resonance (NMR) relaxation measurements in aqueous solutions of Mg x Zn y Fe3−x−y O4 magnetite-based composite magnetic nanoparticles (MNPs) are discussed. It is shown that their transverse relaxivity (relaxation efficiency) r 2 is significantly higher than the longitudinal relaxivity r 1 and depends on the magnetic nanoparticles composition and preparation method. A polyelectrolyte layer adsorbed on the nanoparticle surface increases both relaxivity values. The carbonate-synthesized MNPs possess higher values of r 2 and r 1 as compared with base-precipitated complex oxides. Relaxivity r 2 is shown to be affected by stability of MNPs in aqueous solutions and the aggregation behavior apparently can be assessed through the NMR relaxation measurements.
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Part of this work was supported by the Ministry of Education and Science of the Russian Federation (Project 3.6522.2017).
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Bogachev, Y.V., Nikitina, A.V., Kostina, A.A. et al. NMR Relaxation Efficiency of Aqueous Solutions of Composite Mg x Zn y Fe3−x−y O4 Nanoparticles. Appl Magn Reson 48, 715–722 (2017). https://doi.org/10.1007/s00723-017-0889-6
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DOI: https://doi.org/10.1007/s00723-017-0889-6