Wettability Investigation of UV/O₃ and Acid Functionalized MWCNT and MWCNT/PMMA Nanocomposites by Contact Angle Measurement

Table 5

Surface energy calculation of treated MWCNT thin films using CQC model.

Sample	(mJ/m^2)	(mJ/m^2)	(mJ/m^2)	(mJ/m^2)^1/2	(mJ/m^2)^1/2	Nature
Raw CNT	19.60	18.04	1.56	3.82	0.41	Amphoteric
UV/O3 30 min	43.31	3.65	1.34	0.17	2.01	Amphoteric
UV/O3 60 min	68.09	58.23	9.85	−3.43	2.86	Amphoteric
UV/O3 120 min	73.96	11.17	2.79	−1.18	2.38	Amphoteric
Acid 6 hours	3.96	0.79	−4.48	−1.05	−4.29	Acidic
Acid 12 hours	13.96	6.53	−2.57	−1.77	−1.45	Acidic
Acid 24 hours	24.01	25.76	−1.75	−2.01	−0.87	Acidic