Superhydrophobic and Anti-Icing Surface by Femtosecond Laser Direct Writing

Glass fiber-reinforced polymer (GFRP) is formed with glass fiber as the reinforcing material and resin as the matrix. It is widely used in wind turbine blades because of its lightweight, high strength, and corrosion resistance properties. Herein, a method to prepare superhydrophobic GFRP surfaces by femtosecond laser direct writing combined with fluoroalkylsilane modification is demonstrated. The prepared GFRP surface has excellent superhydrophobicity with contact angle of 163.9 & DEG; and sliding angle of 3.8 & DEG;. In the ice resistance tests, the icing delay time is extended from 33 to 273 s at -5 & DEG;C. The ice adhesion strength is reduced from 217.4 to 40.3 kPa. The surface still has superhydrophobicity and ice adhesion strength of less than 100 kPa after ten cycles of the test. The laser exposure conditions are optimized for water/ice repelling and are at high intensity of 4 TW cm-2 pulse-1 and 2.5 m s-1 beam travel speed, which make the presented approach efficient for fabrication over industrially large areas. Microcone array structures are prepared on glass fiber-reinforced polymer (GFRP) surface by femtosecond laser direct writing. The prepared GFRP surface has excellent superhydrophobicity with contact angle of 163.9 & DEG; and sliding angle of 3.8 & DEG;. Ice resistance property on laser-processed surface shows close to one order of magnitude improvement compared to pristine surface. Good durability is also shown in the tests.image & COPY; 2023 WILEY-VCH GmbH