Table 1.
Results of the characterization of the MNCs obtained by coprecipitation and oxidative precipitation in one step (dTEM = mean diameter by TEM; dXRD = mean crystal size by XRD; DHYD = hydrodynamic size in intensity (Zave) by DLS; Ms = saturation magnetization; χ = initial magnetic susceptibility).
| Sample | dTEM (nm) |
dXRD (nm) |
DHYD (Zave) (nm) |
Fe3O4 ICP wt % |
PAANa EA wt % |
Ms 298 K Am2/kg |
Χ 298 K Am2/kgT |
|---|---|---|---|---|---|---|---|
| C0 | 10 ± 2 | 7.5 | 170 | 98 | 0 | 71 | 758 |
| C2 | 4 ± 1 | 4.4 | 95 | 74.0 | 19.2 | 43.4 | 192 |
| C20 | 3 ± 0.8 | 3.1 | 170 | 50.7 | 49.7 | 16.7 | 19 |
| C50 | 3 ± 1 | 3.3 | 170 | 21.7 | 77.0 | 5.6 | 4 |
| OP0 | 50 ± 20 | 67.3 | 560 | 98.7 | 0 | 82.5 | * |
| OP10 | 28 ± 5 | 34.2 | 270 | 72.9 | 4.5 | 63 | 1700 |
| OP20 | 32 ± 10 | 27.5 | 140 | 75.5 | 11.0 | 62 | 11,900 |
| OP30 | 7 ± 1 | 10.9 | 150 | 53.0 | 31.0 | 24 | 463 |
| OP40 | 4 ± 1 | 4.9 | 220 | 52.6 | 27.0 | 20 | 219 |
| OP50 | 3 ± 0.6 | 5.4 | 170 | 41.1 | 51.5 | 19 | 186 |
(*) The sample OP0 is not superparamagnetic, and the magnetic susceptibility is not defined.