Ultrafast Science / 2022 / Article / Fig 18

Review Article

Nature-Inspired Superwettability Achieved by Femtosecond Lasers

Figure 18

Wettability of the femtosecond laser-structured silicon surface compared to an untreated flat silicon surface. (a, b) Water droplet on (a) the untreated silicon substrate and (b) the structured silicon surface in air. (c, d) Oil droplet on (c) the untreated silicon surface and (d) the structured surface in a water medium. (e) Underwater oil droplet rolling away on the slightly tilted rough silicon surface. Reproduced from [114] with the permission.