Table 1.
Physical characterization of FexCo1−xFe2O4 (where x = 0.8,0.6,0.4,0.2) for bare and coated (chitosan, PEG) nanoparticles using different coprecipitating agents (NH4OH, NaOH) for chemical synthesis. See Figure 4 for other details [10].
| x | Method used | Grain size (nm) | Lattice (Å) | Blocking temperature (°C) | Hydrodynamic diameter (nm) | Maximum magnetization (emu/g) | Coercivity (Oe) | Relaxivity (mM−1s−1) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chitosan | PEG | Bare | Chitosan | PEG | Bare | Chitosan | PEG | Chitosan | PEG | |||||
| 0.8 | NH4OH | 4.0 (±0.6) | 8.48 (±0.06) | −100 | 97.5 | 158.3 | 59.3 | 37.2 | 26.0 | 3.5 | 2.08 | 1.4 | 528 (±26) | 314 (±25) |
| 0.6 | NH4OH | 4.5 (±0.1) | 8.52 (±0.26) | 25 | 135.5 | 154.5 | 55.3 | 28.0 | 20 | 20 | 7.5 | 8.6 | 509 (±45) | 441 (±12) |
| 0.4 | NH4OH | 2.8 (±0.1) | 8.45 (±0.20) | 65 | 140.6 | 159.1 | 43.6 | 25.2 | 16.9 | 157 | 4.2 | 4.8 | 326 (±37) | 310 (±5) |
| 0.2 | NH4OH | — | — | 100 | 110.0 | 155.5 | 32.3 | — | — | 506 | — | — | — | — |
| 0.2 | NaOH | 4.9 (±0.1) | 8.43 (±0.05) | — | — | — | 73.1 | 54.5 | 46.6 | 673 | 11.5 | 7.8 | 769 (±92) | 377 (±14) |