Table 2. Water Static Contact Angle of Water before and after 1 h Washing with Different Solvents.
| water static contact angle (deg) |
sliding angle (deg) |
|||
|---|---|---|---|---|
| solvent | before | after 1 h washing | before | after 1 h washing |
| detergent water | 169.3 ± 2.1 | 155.2 ± 1.0 | 6.3 ± 2.0 | 6.3 ± 2.0 |
| hot water (∼90 °C) | 169.3 ± 2.1 | 157.3 ± 2.2 | 6.3 ± 2.0 | 6.3 ± 2.0 |
| toluene (28.40)a | 169.3 ± 2.1 | 153.2 ± 1.0 | 6.3 ± 2.0 | 8.2 ± 2.0 |
| acetone (25.20)a | 169.3 ± 2.1 | 150.4 ± 1.0 | 6.3 ± 2.0 | 8.1 ± 2.0 |
| benzene (28.88)a | 169.3 ± 2.1 | 152.1 ± 2.1 | 6.3 ± 2.0 | 8.2 ± 2.0 |
a
The value provided in parentheses is the surface tension of the corresponding liquid.