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Linear AC susceptibility versus frequency of as-synthesized (black symbols), centrifuged (red symbols), and BSA-coated (green symbols) MNP. (a) real part χ′, (b) imaginary part χ′′. While as-synthesized and centrifuged MNP show the same spectra with an increased susceptibility for the centrifuged MNP of about 26%, the BSA-coated MNP show a shift of the χ′ peak towards lower frequencies due to the increase of hydrodynamic diameter by the additional BSA-layer.
