Table 1.
Characteristics of the short and long CNT (S-CNT and L-CNT respectively)
| S-CNT | L-CNT | |
|---|---|---|
|
Diameter (nm), mean (extremes) |
37.5 (10–120) |
42 (10–120) |
|
Length |
|
|
| -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 |
|
|
| - Iron (%) (TGA) |
5.8 |
4.8 |
|
XPS (atomic %) |
|
|
| - sp3/sp2 |
0.37 |
0.23 |
| - O |
5.98 |
1.66 |
| - Carboxylic functions |
1.21 |
0 |
| - OH function |
3.05 |
1.77 |
|
XRD |
|
|
| 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 |
ND: not detectable.