A novel methodology for the sizing of magnetic nanoparticles (MNPs) based on diffusion is described herein. The sensing core is an electrical coil wrapped around a capillary filled by an MNP solution. We show that it is possible to determine MNPs' hydrodynamic radius by employing off-the-shelf electronic equipment by measuring the decrease in coil inductance when MNPs diffuse out of the coil by Brownian motion.
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Surpi et al. (2024) studied this question.
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