Scalable Multistep Roll‐to‐Roll Printing of Multifunctional and Robust Reentrant Microcavity Surfaces via a Wetting‐Induced Process

Abstract

Owing to their unique structural robustness, interconnected reentrant structures offer multifunctionality for various applications. a scalable multistep roll‐to‐roll printing method is proposed for fabricating reentrant microcavity surfaces, coined as wetting‐induced interconnected reentrant geometry (WING) process. The key to the proposed WING process is a highly reproducible reentrant structure formation controlled by the capillary action during contact between prefabricated microcavity structure and spray‐coated ultraviolet‐curable resins. It demonstrates the superior liquid repellency of the WING structures, which maintain large contact angles even with low‐surface‐tension liquids, and their robust capability to retain solid particles and liquids under external forces. In addition, the scalable and continuous fabrication approach addresses the limitations of existing methods, providing a cost‐effective and high‐throughput solution for creating multifunctional reentrant surfaces for anti‐icing, biofouling prevention, and particle capture.