Table 1.
Quantitative characterization of Fe2O3 nanoparticles
| Properties | Detection methods | Quantitative characterization | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Plates | Rods | ||||||||
| P1 | P2 | P3 | P4 | R1 | R2 | R3 | R4 | ||
| Length (nm) | TEM | NA | NA | NA | NA | 88 ± 8 | 181 ± 11 | 116 ± 12 | 322 ± 26 |
| Diameter (nm) | TEM | 45 ± 3 | 84 ± 5 | 122 ± 7 | 173 ± 6 | 53 ± 8 | 38 ± 5 | 20 ± 4 | 40 ± 7 |
| Thickness (nm) | TEM | 44 ± 7 | 23 ± 3 | 18 ± 2 | 16 ± 3 | NA | NA | NA | NA |
| Aspect ratio | Cal.* | 1.0 ± 0.1 | 3.7 ± 0.2 | 6.8 ± 0.1 | 10.8 ± 0.3 | 1.7 ± 0.2 | 4.5 ± 0.4 | 5.8 ± 0.5 | 8.0 ± 0.7 |
| Hydrodynamic size (nm) | DLS | 175 ± 10 | 246 ± 7 | 366 ± 16 | 378 ± 8 | 422 ± 12 | 463 ± 8 | 578 ± 8 | 536 ± 4 |
| Zeta potential (nm) | ZPA | − 7.9 ± 0.8 | − 3.6 ± 0.6 | − 5.1 ± 0.4 | − 3.7 ± 0.7 | − 6.5 ± 0.7 | − 10.7 ± 1.6 | − 8.5 ± 0.6 | − 5.2 ± 2.1 |
| Surface area (m2/g) | BET | 22 ± 1.6 | 17.9 ± 1.0 | 17.4 ± 0.6 | 16.8 ± 0.4 | 18.3 ± 1.5 | 20.8 ± 1.8 | 26.9 ± 2.3 | 21.3 ± 1.8 |
| Surface activity (103 a.u.) | DCF | 1.25 ± 0.08 | 2.59 ± 0.11 | 3.23 ± 0.15 | 1.46 ± 0.08 | 0.59 ± 0.04 | 0.35 ± 0.03 | 0.63 ± 0.07 | 0.47 ± 0.03 |
*Calculation (Cal.):