Superhydrophobicity vs. Ice Adhesion: The Quandary of Robust Icephobic Surface Design

摘要: The mesoscale, multitier texture of the lotus leaf has served as an inspiration to fabricate surface designs with controllable superhydrophobic properties, targeting a broad range applications. choice material for such is directly related performance, in particular under adverse and realistic conditions. Due its importance many applications, here aluminium employed platform identify key porous hierarchical textures, yielding extraordinary impalement-resistant behavior: Droplet repellency demonstrated consistently water impact velocities up 12 m s−1 (extreme Weber number, We ≈ 3500). Despite impressive behavior, if ice forms on surfaces, adhesion markedly stronger than less hydrophobic alumina nanotube array structures. In departure from findings well-accepted shear stress-based criterion, deviation between decreasing strength increasing hydrophobicity observed. This explained mechanism, depending strongly applied stress field orientation respective effective ice–substrate contact area. Our results indicate that criteria performance icephobic surfaces should account simultaneous presence tensile stresses, instead stresses alone.