From: Coating carbon nanotubes with a polystyrene-based polymer protects against pulmonary toxicity
 |  | NT1 | NT2 | NT3 |
---|---|---|---|---|
Coating polymer (50/50 wt%) | None | Carboxylic polyacid polymer | PMMA a polymer | |
Diameter (nm) |  | 12 ± 1 | 12 ± 1 | 12 ± 1 |
 | 0-15 nm | 85% | 85% | 85% |
Size distribution (diameter) | 15-30 nm | 13% | 13% | 13% |
 | >30 nm | 2% | 2% | 2% |
Length (μm) |  | 0.1-13 | 0.1-13 | 0.1-13 |
Metallic impurities | Aluminium (%) | 3.2 | 1.15 | 1.25 |
 | Iron (%) | 2.45 | 0.75 | 0.85 |
Specific surface (m 2 /g) | 227.4 | 54.1 | 34 | |
Agglomerate size - mean diameter (%<10 μm) | 338 (0.13) | 118 (1.45) | 267 (0.83) |