Interlaboratory Evaluation of in Vitro Cytotoxicity and Inflammatory Responses to Engineered Nanomaterials: The NIEHS Nano GO Consortium

http://dx.doi.org/10.1289/ehp.1306561



Table 2. Physicochemical characterization of MWCNTs.
Quality Technique O-MWCNT P-MWCNT F-MWCNT
Abbreviations: D, diameter; Fe, iron; L, length; Ni, nickel, S, sulfur.
Size (nm) TEM D: 20–30; L: 5,000–10,000 D: 20–30; L: 5,000–10,000 D: 20–30; L: 5,000–10,000
Size in H2O (intensity-based) (nm ± SD) DLS 324 ± 33 858 ± 58 234 ± 24
Shape/morphology TEM Nanotube Nanotube Nanotube
Surface area (m2/g) BET 180 513 26
Zeta potential in H2O at pH 6.0 (mV ± SD) Zetasizer –12.1 ± 0.3 –11.8 ± 1.1 –48.4 ± 1.7
Elemental analysis (weight percent) ICP-MS 4.5% Ni, 0.8% Fe 1.8% Ni, 0.1% Fe 0.2% S