Table 2.
Changes in the structure of magnetic nanoparticles and after modification with APTMS occurring during degradation in PBS solution.
| Analysis | Parameter | Fe3O4 | Fe3O4-Aminated NPs | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Degradation, days | 0 | 1 | 5 | 10 | 0 | 1 | 5 | 10 | ||
| XRD | Relative change of lattice parameter, % (a0 = 8.34800 Å, PDF—01-075-9673) |
0.074 | 0.089 | 0.097 | 0.103 | 0.021 | 0.035 | 0.047 | 0.048 | |
| Crystalline size, nm | 10.3 ± 0.7 | 12.1 ± 0.6 | 12.2 ± 0.9 | 12.9 ± 0.3 | 12.8 ± 0.8 | 12.5 ± 0.7 | 12.7 ± 0.4 | 12.8 ± 1.1 | ||
| Crystallinity, % | 79.4 ± 3.1 | 77.9 ± 1.5 | 67.8 ± 2.4 | 57.6 ± 2.3 | 80.1 ± 1.8 | 79.5 ± 1.5 | 75.9 ± 1.4 | 67.1 ± 2.2 | ||
| DLS | Average size of particles, nm | 18.9 ± 3.2 | 19.66 ± 3.14 | 26.52 ± 4.1 | 27.88 ± 3.9 | 21.8 ± 3.56 | 21.4 ± 3.7 | 23.46 ± 4.23 | 26.22 ± 4.15 | |
| Mossbauer | Hyperfine field, kOe | A-site | 472.9 ± 2.5 | 453.2 ± 3.5 | 434.1 ± 4.6 | 421.6 ± 2.7 | 466.8 ± 8.6 | 452.2 ± 4.3 | 441.3 ± 4.7 | 422.2 ± 4.3 |
| B-site | 442 ± 4.1 | 434 ± 3.2 | 432 ± 4.4 | 417 ± 2.2 | 432 ± 1.7 | 426 ± 2.2 | 421 ± 2.4 | 418 ± 2.3 | ||