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Table 1 Characterization of MWCNT Material

From: Mitsui-7, heat-treated, and nitrogen-doped multi-walled carbon nanotubes elicit genotoxicity in human lung epithelial cells

Measure MWCNT-7 MWCNT-HT MWCNT-ND
Mean diameter (nm) 49 ± 13a 57 ± 24 30 ± 23
Mean length (μm) 5 ± 4a 5 ± 4 2 ± 3
Hydrodynamic diameter (nm) 411 ± 16 499 ± 15 432 ± 18
Zeta potential (mV) − 40 ± 1 − 51 ± 1 − 49 ± 2
Metal Contaminant (%Wt, SD) Cr 0.023 ± 0.006 0.04 ± 0.01 0.020 ± 0.006
Fe 0.020 ± 0.006 0.10 ± 0.03 0.09 ± 0.03
Ni 0.020 ± 0.006 0.040 ± 0.006 0.08 ± 0.03
Co < 0.002 ± 0.000 < 0.002 ± 0.000 < 0.002 ± 0.000
  1. MWCNT-7, HT, and ND mean diameter, mean length, hydrodynamic diameter, zeta potential, and metal catalyst contamination (ICP-MS) were measured; ± standard deviation, SD. aMeasured previously [57]