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Table 1 Physical dimensions of CNT/F dispersed in isopropanol

From: Physicochemical characterization and genotoxicity of the broad class of carbon nanotubes and nanofibers used or produced in U.S. facilities

  MW #1 MW #2 MW #3 MW #4 MW #5 MW #6 MW #7 CNF #1 CNF #2
Diameter (nm)
 Company Reported Diameter (nm) 6–9 10 10–15 5–30 N/A 70–80 150 100 150
 Geometric Mean (nm ± GSD) 13 ± 1 14 ± 2 20 ± 2 19 ± 1 63 ± 1 28 ± 2 37 ± 2 102 ± 1 103 ± 1
 Arithmetic Mean (nm ± SE) 13 ± 0 16 ± 1 26 ± 2 20 ± 1 67 ± 2 38 ± 3 54 ± 4 110 ± 3 110 ± 3
 Median 12 14 19 18 63 25 28 98 100
 Diameter Range 6–29 6–216 8–275 8–133 21–168 8–218 9–425 40–397 46–263
 Normal Distribution Lognormal         Lognormal
Length (μm)
 Company Reported Length (μm) 5 N/A 0.1–10 100 N/A N/A N/A 50–200 50–200
 Geometric Mean (μm ± GSD) 0.67 ± 1.81 1.34 ± 2.21 1.10 ± 2.00 1.41 ± 1.97 4.39 ± 2.07 2.05 ± 2.53 2.88 ± 4.26 3.64 ± 2.36 2.16 ± 2.31
 Arithmetic Mean (μm ± SE) 0.80 ± 0.03 1.79 ± 0.10 1.28 ± 0.07 1.84 ± 0.13 5.62 ± 0.29 3.42 ± 0.37 7.64 ± 0.78 5.23 ± 0.36 3.20 ± 0.28
 Median 0.6607 1.5437 1.0148 1.2896 4.547 2.1503 2.3781 3.7273 2.0003
 Length Range 0.1–3.6 0.2–50.9 0.1–8.5 0.3–20.6 1.2–25.8 0.3–37.3 0.1–49.1 0.3–37.6 0.4–42.7
 Normal Distribution Lognormal Lognormal Lognormal    Lognormal   Lognormal Lognormal
Aspect Ratio
 Aspect Ratio (GeoMean ± GSD) 53 ± 2 96 ± 2 50 ± 2 76 ± 2 69 ± 2 73 ± 2 78 ± 3 36 ± 2 21 ± 2