Study on the Anti-Frosting and Droplet Contact Characteristics of Fluorine-Based Self-Assembled Superhydrophobic Coating

Abstract

In order to study the effect of the cold surface on the anti-frosting performance of the superhydrophobic coating and the impact contact behavior of droplets, a fluorine-based self-assembled superhydrophobic coating was sprayed on the surface of carbon fibers. Subsequently, the frosting, droplet icing and droplet contact behaviors of the sample on a semiconductor refrigeration table were observed visually, and the variation mechanisms of frost formation, droplet icing and droplet impact contact behaviors over time on the surface of superhydrophobic coatings were analyzed. Results showed that unlike ordinary surfaces, condensation droplets on superhydrophobic surfaces did not freeze at-5 ℃. At temperatures of-10,-15 ℃, the frost suppression effect of superhydrophobic surfaces was significantly better than that of ordinary surfaces, with frost formation times delayed by 34 s and 22 s, respectively. Besides, the delayed freezing times of droplets on superhydrophobic surfaces at-5,-10,-15 ℃ were 16 times, 10 times and 9 times longer than those on ordinary surfaces, respectively. The maximum spreading diameter of droplets after colliding with low-temperature superhydrophobic surfaces was the same at different temperatures. The droplet partially rebounded at-5 ℃ and-10 ℃, and rebounded 11 times on the superhydrophobic surface at 25 ℃.

Keywords

• superhydrophobic; anti-frosting; delayed icing; droplet impact