Table 1 Characteristics of the short and long CNT (S-CNT and L-CNT respectively)
| Â | S-CNT | L-CNT |
|---|---|---|
Diameter (nm), mean (extremes) | 37.5 (10–120) | 42 (10–120) |
Length | Â | Â |
-Mean length (μm) | 4.8 | 9.5 |
- CNT <5μm (%) | 54 | 11 |
- CNT <10 μm (%) | 86 | 53 |
- CNT <15 μm (%) | 97 | 79 |
- CNT < 20 μm (%) | 99 | 92 |
Metal content | Â | Â |
- Iron (%) (TGA) | 5.8 | 4.8 |
XPS (atomic %) | Â | Â |
- sp3/sp2 | 0.37 | 0.23 |
- O | 5.98 | 1.66 |
- Carboxylic functions | 1.21 | 0 |
- OH function | 3.05 | 1.77 |
XRD | Â | Â |
Sample components | MWCNT + Fe3O4, alpha iron and beta iron nanoparticles | MWCNT + Fe3O4, alpha iron and beta iron nanoparticles |
Ratio of the amounts of iron oxide and CNT, normalized to that in L-CNT | 2 | 1 |
Endotoxin | ND | ND |