Both of those the dimensions overestimation along with the substantial error don't allow for, in our feeling, to correctly interpret the experimental data in Fig. 5. A more accurate definition with the hydrodynamic diameter is possible from direct measurements with the diffusivity of MNPs currently underneath investigation. We foresee Nonetheless https://lingjunbio.quora.com/Properties-of-Magnetic-Beads-The-properties-of-biomagnetic-beads-mainly-depend-on-their-core-materials-coating-layers