Fabrication of transparent superhydrophobic glass via periodic array holes processing combined with PDMS filling and imprinting
摘要
Transparent superhydrophobic glass holds significant promise for applications in various fields, including automotive, architecture, and photovoltaics. However, an inherent challenge arises from the conflict between the rough structure of the superhydrophobic surface and the high light transmittance required by glass. In this study, a superhydrophobic glass surface with high light transmittance was fabricated by combining periodic array hole processing with ultrafast laser treatment, followed by filling with polydimethylsiloxane (PDMS) and imprinting using a laser-processed soft template. The PDMS, with a refractive index matching that of glass, along with the rough surface structure transferred via imprinting, effectively balances light transmittance and wettability. The resulting surface exhibits a water contact angle of 159.6° and a rolling-off angle of 8.1°. Furthermore, by varying the area fraction of the array holes, the superhydrophobic glass maintains a transmittance up to 84.98% across the visible spectrum. Abrasion tests using sandpaper demonstrate that the surface, with alternating soft PDMS and hard glass, effectively resists external friction, maintaining its hydrophobicity even after 22 cycles of abrasion. This research presents an effective method for preparing mechanically durable superhydrophobic glass surfaces that retain optical transparency, thereby enhancing their self-cleaning performance and demonstrating significant potential for practical applications.
Graphical abstract