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

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

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

* impossible to obtain accurate lengths due to excessive tangling.
nd – not determined.
N/S: narrow diameter/short length; W/S: wide diameter/short length; N/L: narrow diameter/long length.
O: original MW; F: functionalized MW; P: purified MW.

ISSN: 1743-8977