Anisotropic Superhydrophobic Properties of Bioinspired Surfaces by Laser Ablation of Metal Substrate inside Water. Issue 16 (16th July 2021)

• Record Type: Journal Article
• Authors: Su, Yilin; Zhao, Yizhe; Jiang, Shengyuan; Hou, Xuyan; Hong, Minghui
• Is Part Of: Advanced materials interfaces. Volume 8:Issue 16(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-07-16
• Subjects: bioinspired surfaces -- laser ablation inside water -- micro/nanostructures -- superhydrophobic anisotropy; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.202100555
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: Water droplet unidirectional adhesion, wetting, and transport on the asymmetric superhydrophobic surfaces have attracted much research interest in theory analyses and applications. In this study, inspired by the butterfly wings and lotus leaf, a novel anisotropic superhydrophobic surface with different tilt angles of the wedge‐shaped structures is prepared on aluminum surfaces via laser ablation inside water. It is demonstrated experimentally that the resistant force of water droplets on the bioinspired surfaces is different along the tilt direction of the wedge‐shaped structure and the inverse direction. The sliding and bouncing behaviors of water droplets on different bioinspired wedge‐shaped structure surfaces are simulated and tested to understand better the mechanism of the rolling and bouncing droplets induced by asymmetric wedge‐shaped structures. Furthermore, the effect of the tilt wedge‐shaped structures on the anisotropic superhydrophobic properties is revealed from the mechanical point of view. The relationship between the anisotropic superhydrophobic properties and the tilt angle of the wedge‐shaped structure is investigated. Abstract : A novel bioinspired surface with tilt wedge‐shaped structures is fabricated on the aluminum substrate by nanosecond laser ablation inside water. The theoretical model is established to explain the anisotropic phenomenon on the bioinspired surface. The bouncing and rolling movements of water droplets on the surface are simulated and tested to explain the anisotropic phenomena on the wedge‐shaped structures at different tilt angles.