S-CNT | SF-CNT | L-CNT | LF-CNT | |
---|---|---|---|---|
Diameter, mean (nm) | 26 | 25 | 24 | 25 |
Length, mean ± SD (μm) | 1.7 ± 0.9 | 1.6 ± 1.6 | 6.4 ± 4.3 | 9.2 ± 5.8 |
- CNT < 2 μm (%) | 69 | 74.5 | 2.5 | 0 |
- CNT < 5 μm (%) | 100 | 99.5 | 51 | 23 |
- CNT < 10 μm (%) | 100 | 100 | 84 | 67 |
- CNT < 20 μm (%) | 100 | 100 | 98 | 93 |
Iron content (TGA), mean (weight %) | 4.4 | 1.3 | 4.5 | 1.0 |
Composition (XPS) | ||||
Carbon (atomic %) | 98.6 | 91.7 | 97.2 | 91.6 |
Oxygen (atomic %) | 1.4 | 8.1 | 1.8 | 8.3 |
Sulfur (atomic %) | 0 | 0.2 | 0 | 0.1 |
Endotoxin levels | ND | ND | ND | ND |
Intrinsic ROS production, mean ± SD | 0.92 ± 0.01 | 0.05 ± 0.01 | 0.77 ± 0.05 | 0.65 ± 0.05 |