Table 1.
Static and hysteresis contact angle measurements with water, surface composition (at %), specific surface area, and micropore area of MW-CNTs before and after PFPE-functionalization (I-BP50, II-LP50) and fluorination (III-F).
| Specimen | Contact Angle | Surface Composition 1 (at %) | Specific Surface Area 2 (m2/g) | Micropore Area 3 (m2/g) | |||
|---|---|---|---|---|---|---|---|
| Static | Hysteresis | F | O | C | |||
| MW-CNTs | n.s. 4 | - | - | 1.3 | 98.7 | 389 | 31 |
| I-BP50 | 174° | 4.0° | 9.2 | 2.1 | 88.7 | 231 | 0 |
| II-LP50 | 159° | 5.3° | 4.2 | 2.4 | 93.4 | 308 | 0 |
| III-F | 172° | 4.2° | 14.2 | 2.0 | 83.8 | 277 | 26 |
1 Determined by XPS. 2 Determined through BET theory. 3 Determined by t-plot method. 4 not stable. Water droplets are quickly adsorbed (2–4 s) into MW-CNTs pellets.