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Characterization of size and composition of the BNF magnetic nanoparticles: (a) analytical ultra-centrifugation data (red circles) measured13 on an Optima XL-I from Beckman-Coulter, USA and photon correlation spectroscopy data (blue triangles) measured (see footnote 13) on a Zetasizer Nano ZS90 by Malvern Instruments, Inc. (b) Mössbauer spectroscopy measured on dried nanoparticles at 5 K.
