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Table 1 Characteristics of the short and long CNT (S-CNT and L-CNT respectively)

From: Critical role of surface chemical modifications induced by length shortening on multi-walled carbon nanotubes-induced toxicity

  S-CNT L-CNT
Diameter (nm), mean (extremes) 37.5 (10–120) 42 (10–120)
Length   
-Mean length (μm) 4.8 9.5
- CNT <5μm (%) 54 11
- CNT <10 μm (%) 86 53
- CNT <15 μm (%) 97 79
- CNT < 20 μm (%) 99 92
Metal content   
- Iron (%) (TGA) 5.8 4.8
XPS (atomic %)   
- sp3/sp2 0.37 0.23
- O 5.98 1.66
- Carboxylic functions 1.21 0
- OH function 3.05 1.77
XRD   
Sample components MWCNT + Fe3O4, alpha iron and beta iron nanoparticles MWCNT + Fe3O4, alpha iron and beta iron nanoparticles
Ratio of the amounts of iron oxide and CNT, normalized to that in L-CNT 2 1
Endotoxin ND ND
  1. ND: not detectable.