Abstract
Acceleration of the longitudinal spin relaxation kinetics, associated with the presence of magnetic nanoparticles (MNPs), has been analysed based on the diffusion mechanism of the spin relaxation. The predictions of the outer sphere model were tested in viscous systems and complex multiphase systems, where different components had different mobilities. Depending on the effective size of nanoparticles and molecular mobility, increase, decrease or no changes in the relaxation rate have been observed. The results confirm the applicability of the model to systems with MNPs of ultra-fine size.
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