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Ultrafast Processing of Hierarchical Nanotexture for a Transparent Superamphiphobic Coating with Extremely Low Roll-Off Angle and High Impalement Pressure

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Article number1706529
JournalAdvanced Materials
Volume30
Issue number14
Early online date2018
DOIs
Publication statusPublished - 2018
Publication typeA1 Journal article-refereed

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.

Keywords

  • Omniphobic, Spray coating, Superhydrophobic, Superoleophobic, Wetting

Publication forum classification

Field of science, Statistics Finland