Ultradurable Omni‐Liquid‐Repellent Smart Window as a High‐Performance Wettability/Transparency Manipulator Enabled via Laser‐Writing Magnetism‐Actuated Microshutters

Abstract

Slippery liquid‐infused porous surfaces (SLIPS) derived smart windows (SWs) that dynamically fine‐tune the solar spectrum are promising candidates for alleviating the global energy crisis, especially for dim rainy climates. Unfortunately, the inferior durability, high energy‐consumption, and slow tune‐responsivity over SLIPS‐based SWs greatly hinder their practical usage. Reported is an ultrarobust omni‐liquid‐repellent magnetism‐actuated reconfigurable microshutters (OLR‐MARS) via integrating a femtosecond laser ablation and soft‐lithography technique. By alternately loading/discharging a remote magnet, OLR‐MARS can be reversibly switched between a transparent mode and an opaque mode within 0.03 s, which is far sensitive than the previously‐reported SWs. Simultaneously, OLR‐MARS can harness the surface liquids between a slippery state (the sliding angle of ≈15o) and a sticky one (pinning at a tilt angle of 90o). Significantly, owing to its all‐solid‐state merit, OLR‐MARS demonstrates good longevity even when subjected to the raindrops impact above 1000 cycles. Results indicate dual switching over the interfacial hydrodynamics and optics. Last but not least, leveraging the optimized OLR‐MARS, encryption‐decryption, thermal management, and an angle‐dependent privacy‐screen is deployed. Current novel OLR‐MARS with robust durability, fast responsivity, and energy‐free advantages holds promising potential in self‐cleaning smart windows, energy‐saving buildings, antivoyeurism, etc.