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QCM-D responses of uncoated Fe3O4 substrates exposed to a 10 vol % FBS solution: (a) harmonic resonance frequency, Δfn/n, with n = 3, 5, 7, 9, and 11, (b) corresponding dissipation, ΔDn, and (c) areal mass density determined from eq 1. The first arrow denotes the FBS injection time and the second arrow, the rinsing time.
