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Table 1 Elemental analysis , length, diameter and surface area of MWCNT

From: Effect of MWCNT size, carboxylation, and purification on in vitro and in vivo toxicity, inflammation and lung pathology

MWCNT C % by O % by Fe % by Ni % by Diameter Length Surface area
  weight weight weight weight (nm) (nm) (m2/g)
N/S-O 96.30 1.66 0.85 1.19 17.78 ± 3.79 1108.45 ± 459.81 140.6
N/S-F 90.59 9.41 - - 24.46 ± 6.36 897.67 ± 430.49 nd
N/S-P 98.23 0.92 - 0.85 18.87 ± 5.10 1007.03 ± 399.77 nd
W/S-O 95.53 3.49 0.51 0.47 31.67 ± 6.52 1198.58 ± 353.06 204.9
W/S-F 86.28 13.72 - - 32.50 ± 9.01 760.92 ± 518.89 nd
W/S-P 97.18 2.42 - 0.40 30.19 ± 7.64 810.79 ± 463.81 nd
N/L-O 98.46 0.72 - 0.82 15.49 ± 3.39 -* 217.3
N/L-F 86.74 13.26 - - 22.69 ± 5.39 -* nd
N/L-P 99.17 0.37 - 0.46 16.72 ± 3.56 -* nd
  1. * impossible to obtain accurate lengths due to excessive tangling.
  2. nd – not determined.
  3. N/S: narrow diameter/short length; W/S: wide diameter/short length; N/L: narrow diameter/long length.
  4. O: original MW; F: functionalized MW; P: purified MW.