Table 1.

MWCNT Characterization [19]

Manufacturer	Sun Innovations
Average Diametera	15 nm (N = 90)
Length Estimateb	2.6 um (N = 102)
Purityc	99%
Elemental Analysisd
C	97%
H, N, S	< 0.5%
Ni	0.52%
Cl, Co, Fe, Cu	< 0.01%
Surface Compositione
C	98%
O	2%
Average Surface Areaf	175m2/g
Skeletal Densityg	2.0 g/cm3
Zeta potentialh	−30 mV

^aTEM Transmission electron microscopy

^bSEM Scanning electron microscopy

^cTGA Thermogravimetric analysis

^dCarbon, hydrogen, nitrogen and sulfur determined by C,H,N,S analyzer. Ni presence indicated by EDS spectra

Ni, Cl, Co, Fe and Cu quantitated by NAA

^eXPS survey scan

^fBET analysis

^gHelium gas picnometry

^hElectrophoretic velocimetry