Abstract
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-1 . 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.
Highlights
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
Full comprehension of the super liquid-repellency mechanisms is a prerequisite to realize the potential of superamphiphobic surfaces in applications ranging from protective and self-cleaning materials[4, 7] to medical devices[8, 9] and gas exchange membranes.[10]
The capability of superamphiphobic surfaces to repel low-surface-tension liquids arises from a combination of their overhang, inward curved surface morphology and low-surface-energy chemistry
Summary
Ultra-fast processing of hierarchical nanotexture for a transparent superamphiphobic coating with extremely low roll-off angle and high impalement pressure Hannu Teisala*, Florian Geyer, Janne Haapanen, Paxton Juuti, Jyrki M. Drops of water and n-hexadecane (10 μL) deposited on the surface roll off the coating at inclination angles
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