Fig. 6. Influence of dispersion medium on MPI quality of SiO2-coated (70 wt%) Zn0.4Fe2.6O4, as well as commercial PVP-coated Fe3O4, dispersed in H2O or PBS at 17 g L−1. (a) Absolute values of the system matrices at 99.57 kHz. Values are normalized to sample maximum. (b) Signal at the particle location as a function of the signal harmonics. (c) Reconstructed images of all samples. Signals are normalized to sample maximum. Blue square indicates particle location. (d) Ratio of signal measured in H2O over PBS at the particle location as a function of the signal harmonics.
