Table 3.
Thermal analysis results obtained by Differential Scanning Calorimetry (DSC) for iron oxide nanostructures (NVx) synthesized by hydrothermal process. Main characteristics of endothermic and exothermic peaks (temperature and enthalpy values) observed from room temperature (RT) up to 590 °C.
| Sample | Peak 1 | Peak 2 | Peak 3 | Peak 4 | Peak 5 | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| T, °C | ΔH, J/g | T, °C | ΔH, J/g | T, °C | ΔH, J/g | T, °C | ΔH, J/g | T, °C | ΔH, J/g | |
| NV4 | 39.7 | 2.4 | 148.6 | 0.97 | 308.7 | −10.7 | 478.9 | −4.56 | ||
| NV5 | 40.7 | 2.05 | 67.1 | 1.6 | 292.4 | −0.88 | 366.2 | −1.13 | 441.8 | −1.33 |
| NV6 | 84.5 | 1.65 | 231.2 | −0.64 | 338.9 | −3.32 | ||||
| NV7 | 100.6 | 82.86 | 241.1 | 9.06 | 296 | 5.21 | 413.1 | −21.47 | ||