Self‐Adaptive Surface with Tunable Superamphiphobicity Fabricated by Femtosecond Laser Induced Backward Transfer

In recent years, a rapid advance in fabricating smart surfaces with tunable wettability have been witnessed. However, switchable superamphiphobic surface remains a great challenge today. Here, glass surfaces with tunable wetting performance between amphipathicity and amphiphobicity, "lotus effect" and "petal effect," isotropic and anisotropic amphiphobicity are obtained by femtosecond-laser-induced backward transfer (LIBT) method. By printing simple patterns, polytetrafluoroethylene (PTFE) is spatial-selectively transferred with composite micro/nano-structures formed on the glass surfaces, ensuring a strong repellence for water and oil. Besides, the surface topography and chemistry can be finely regulated in a single-step process without damage to the glass, which provides the feasibility of controlling the surface wettability. Herein, applications such as high precision mixing reactor, droplet volume screening micro-device, auto-filtering droplet channel are designed and demonstrated. Compared to other methods, the LIBT method featuring rapid, large-area, maskless prototyping is proved to be a promising method for programmable manipulations of functional surfaces with diverse wettability.