Ultrafast Science / 2022 / Article / Fig 15

Review Article

Nature-Inspired Superwettability Achieved by Femtosecond Lasers

Figure 15

Achievement of superoleophobicity by designing reentrant structure. (a) Springtail. (b, c) Reentrant texture on the springtail skin. (d, e) Hypothetical solid-air-liquid interfaces on (d) a trapezoid texture and (e) an inverted-trapezoid texture. (f) Robust solid-liquid-gas interface of the liquid with low surface tension on the inverted-trapezoid (reentrant) texture. (g) Morphology of the triply reentrant structures prepared by two-photon polymerization. (h) Digital picture of triply reentrant structures on silicon wafer and its repellence to n-perfluorooctane (inset). (i) Digital picture of triply reentrant structures on flexible polyimide film and its repellence to n-perfluorooctane droplet (inset). Reproduced from [73, 112, 167] with the permission.