Bioinspired Hierarchical Woven Fabrics With Capture Ridges and Patterned Drainage for Efficient Fog Harvesting

Freshwater scarcity has emerged as a critical bottleneck restricting sustainable development, while fog harvesting represents a promising strategy to alleviate this global water crisis. Nevertheless, state‐of‐the‐art fog‐harvesting materials remain constrained by the lack of effective coupling between rapid droplet capture and directional liquid transport, resulting in unsatisfactory collection efficiency over long‐term operation. Here, through precise modulation of fabric surface chemistry, macroscopic woven architecture, and asymmetric wettability, a bioinspired hierarchical Janus woven fabric is designed that synergistically integrates two biofunctional structures: beetle‐mimicking topographic ridges on the capture side for ultrafast fog droplet nucleation and interception, and leaf‐vein‐like hierarchical drainage channels on the opposite side for low‐resistance directional liquid delivery. Leveraging this multiscale synergistic enhancement, the as‐prepared fabric achieves an exceptional fog harvesting rate of 3663.9 mg cm −2 h −1 , surpassing that of most fabrics. Furthermore, the resulting fabric exhibits excellent long‐term operational stability in fog collection, as well as robust environmental durability against prolonged ultraviolet irradiation, acidic, alkaline, and high‐salinity aqueous conditions. This study establishes a universal design paradigm based on woven fabrics that achieves seamless synergy between efficient fog interception and directional liquid transport. It provides a viable technical route for large‐scale freshwater production in water‐deficient fog‐prone regions.