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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