Effect of Size of Multiwalled Carbon Nanotubes Dispersed in Gear Oils for Improvement of Tribological Properties

Table 2

Raman Spectra characteristics of MWCNTs.

MWCNTs	Intensity of D band, ID	Intensity of G band, IG	Intensity of band, I	Ratio of ID and IG
Pristine	1536	2100	1594	0.731
5 hour ball milled	1261	1708	1082	0.738
10 hour ball milled	1410	1855	974	0.76
20 hour ball milled	1413	1266	774	1.11