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Line widths of the NMR proton signal from different concentrations of the iron oxide particles.
| Fe concentration (mM) | Fe concentration (μg/mL) | NMR line width (Hz) |
|---|---|---|
| 0.89 | 50 | 69.5 ± 11.3 |
| 1.79 | 100 | 101.1 ± 19.5 |
| 3.57 | 200 | 161.9 ± 28.6 |
| 8.9 | 500 | 340.8 ± 63.3 |
| 17.9 | 1000 | 640.5 ± 117.8 |
| 537 | 30,000 | ~14000 ± 2000 |
