Table 1 Characteristics of t-ox-MWCNTs
Characteristic items | |
|---|---|
Inside diameter (nm, mean ± SD) | 8.1 ± 2.1 |
Outside diameter (nm, mean ± SD) | 17.8 ± 6.4 |
Number of graphene layer (mean ± SD) | 15.0 ± 5.0 |
Length (nm, mean ± SD) | 825 ± 174 |
Structure | hollow and bamboo-like tubes |
Morphology | curved and tangled |
ID/IG value (mean ± SD) | 1.14 ± 0.03 |
Surface modification | hydroxyl and carboxyl groups |
OH coverage (mmol/g) | 4.2–4.8 |
COOH coverage (mmol/g) | 2.4–2.8 |
Specific surface area (m2/g, mean ± SD) | 320 ± 15 |
Zeta potential (mV, mean ± SD) | −48.9 ± 8.0 |
Solubility (mg/mL)* | 0.10 (water) 0.01 (PBS) |
Residue metals (wt%) | Al 1.41 |
Fe 0.26 | |
Mo 0.01 | |
Cr 0.15 |
