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Contact angle of water on PO and laser-textured surfaces.
| Surface | Orientation to Ripples Direction | Contact Angle θ (°) |
Spreading Coefficient |η| (-) |
|---|---|---|---|
| PO | - | 49.1 ≤ θ ≤ 59.1 | 0.19 |
| UV-LIPSS | Perpendicular | 32.2 ≤ θ ≤ 37.5 | 0.22 |
| UV-LIPSS | Parallel | 35.1 ≤ θ ≤ 39.9 | 0.20 |
| GR-LIPSS | Perpendicular | 50.5 ≤ θ ≤ 58.5 | 0.18 |
| GR-LIPSS | Parallel | 55.4 ≤ θ ≤ 66.2 | 0.16 |
