Department of Physics at Interfaces, Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128, Mainz, Germany.
Laboratory of Physics, Tampere University of Technology, P.O. Box 692, FI-33101, Tampere, Finland.
Adv Mater. 2018 Apr;30(14):e1706529. doi: 10.1002/adma.201706529. Epub 2018 Feb 27.
Low roll-off angle, high impalement pressure, and mechanical robustness are key requirements for super-liquid-repellent surfaces to realize their potential in applications ranging from gas exchange membranes to protective and self-cleaning materials. Achieving these properties is still a challenge with superamphiphobic surfaces, which can repel both water and low-surface-tension liquids. In addition, fabrication procedures of superamphiphobic surfaces are typically slow and expensive. Here, by making use of liquid flame spray, a silicon dioxide-titanium dioxide nanostructured coating is fabricated at a high velocity up to 0.8 m s . After fluorosilanization, the coating is superamphiphobic with excellent transparency and an extremely low roll-off angle; 10 µL drops of n-hexadecane roll off the surface at inclination angles even below 1°. Falling drops bounce off when impacting from a height of 50 cm, demonstrating the high impalement pressure of the coating. The extraordinary properties are due to a pronounced hierarchical nanotexture of the coating.
低滚落角、高刺穿压力和机械坚固性是超疏液表面实现其在从气体交换膜到防护和自清洁材料等应用中潜力的关键要求。具有超双疏性的表面可以排斥水和低表面张力液体，但仍难以实现这些特性。此外，超双疏表面的制造工艺通常既缓慢又昂贵。在这里，通过利用液体火焰喷涂，在高达 0.8 m s 的高速下制造出二氧化硅-二氧化钛纳米结构涂层。经过氟硅烷化处理后，涂层具有超疏水性和极好的透明度，滚落角极低，仅为 10 µL 的正十六烷液滴在倾斜角度甚至低于 1°时即可滚落。当从 50 cm 的高度下落撞击时，液滴会弹回，这表明涂层具有很高的刺穿压力。这种非凡的性能归因于涂层明显的分层纳米结构。
