Precise Study on Size-Dependent Properties of Magnetic Iron Oxide Nanoparticles for In Vivo Magnetic Resonance Imaging

Figure 2

(a) DLS data of Fe₃O₄@PEG with different sizes in water. (b) The stability assessment by monitoring average hydrodynamic diameters of Fe₃O₄@PEG in water during 5 months. The data of (b) is shown as mean ± SE (). (c) Hysteresis loops of Fe₃O₄@PEG with different sizes. (d) Temperature-time curves of Fe₃O₄@PEG in an aqueous phase (1 mg Fe/ml) under ACMF (420 kHz, 15 A, 2.25 kA/m). (e) Relaxation rate and (f) T₂-weighted MR images of Fe₃O₄@PEG with different sizes upon iron concentration measured by a 1.5 T MR scanner.

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