The Comparison of Biocompatibility Properties between Ti Alloys and Fluorinated Diamond-Like Carbon Films

Table 3

Contact angle and surface energy of uncoated compared with coated specimens.

Specimen	Contact angle (°)			Surface energy (mN/m)
	Distilled water	Ethylene glycol	Diiodomethane	𝛾^𝑑	𝛾^𝑝	𝛾^ℎ	𝛾^𝑇
CP Ti	80.4	58.0	50.1	29.2	5.6	2.7	37.5
Ti-6Al-4V	79.3	57.5	45.7	29.8	8.4	2.6	40.8
NiTi	84.5	59.1	49.9	32.4	2.0	1.4	35.8
NiTi-coated F-DLC 2 : 1	81.4	50.9	24.5	43.3	3.1	0.4	46.8
NiTi-coated F-DLC 1 : 1	85.3	55.5	32.2	41.7	1.8	0.2	43.7

𝛾^𝑑: dispersion force component, 𝛾^𝑝: polar force component, 𝛾^ℎ: hydrogen-bonding force component, 𝛾^𝑇: total surface energy.