MWCNTs type/manufacturer | Characterization | Ref. | |
---|---|---|---|
MWNT-7 (lot #05072001Â K28)/Mitsui & Co., Inc. (USA) | Â | MWCNT | |
 | L (SEM, μm) | 3.86 | |
 | D (SEM, nm) | 49 ± 13.4 | |
 | Trace metal contamination [sodium (0.41 %) and iron (0.32 %)] (Also reported 1.32 % for total and 1.06 % for iron content) | 0.78 | |
 | SSA (BET, m2/g) | 26 | |
 | Zeta potential (mV) | -11 | |
 | Number of walls | 20–50 | |
Baytubes/Bayer Material Science, (Germany; no longer commercially available) | Â | MWCNT | |
 | Cobalt content (%, wt/wt) (ICP-OES) | 0.46 | |
 | Content of cobalt (Co) (%, wt/wt) (AAS) | 0.53 | |
 | Elemental analysis (% carbon-oxygen) | 98.6–1.4 | |
 | SSA (BET, m2/g) | 253 | |
 | Bulk density (g/cm3) | 0.16 | |
NM400 and NM402/JRC | Â | NM400 | |
L (SEM, μm) | 0.7–3 | ||
D (SEM, nm) | 5–35 | ||
Impurities total, % Al, % Co | 5.38 total, 0.24, 0.58 | ||
(Also reported 13Â % for total impurities) | |||
Defects | 1.2 | ||
SSA (BET, m2/g) | 245.8 | ||
NM401/JRC | Â | CNTLarge | |
L (SEM, TEM, μm) | 4.05 ± 2.4 | ||
D (SEM, TEM, nm) | 67 ± 26.2 | ||
Impurity (%) | 3 | ||
SSA (BET, m2/g) | 14.6 | ||
NM402/JRC | Â | NM402 | |
L (SEM, μm) | 0.7–4 | ||
D (SEM, nm) | 6–20 | ||
Impurities total, % Al, % Co | 3.16, | ||
(Also reported 13Â % for total impurities) | 3.00 x 10-4, 2.39 | ||
Defects | 1.12 | ||
MWCNTs/Helix Materials Solutions, Inc. (Richardson, TX) | Â | MWCNT | |
 | L (TEM, μm) | 0.3–50 | |
 | D (TEM, nm) | 10–30 | |
 | Purity (TGA, %) | >94 | |
 | Metal content % Ni, %La (ICP-AES) | 0.34 and 0.03 by weight | |
 | Metal %Ni (EDX) | 0.12 | |
 | SSA (BET, m2/g) | 109 | |
 | Zeta potential (mV) | -13 ± 2 |