Ultra‐Robust Joule‐Heated Superhydrophobic Smart Window: Dually‐Switching Droplets Adhesion and Transparency via In Situ Electric‐Actuated Reconfigurable Shape‐Memory Shutters

作者：Chen Chao; Yao Hao; Guo Sijia; Lao Zhaoxin; Xu Yudong; Li Shuyi; Wu Sizhu

来源：Advanced Functional Materials, 2022, 33(3).

• femtosecond laser
• in situ controllable adhesion
• shape‐memory micro‐shutters
• silver nanowires thin‐film heaters
• switchable transparency

Slippery liquid‐impregnated porous surfaces (SLIPS) based smart windows (SWs) that dynamically fine‐tune the solar energy gain are promising candidates for alleviating the global energy crisis, especially for dim rainy climates. Unfortunately, the inferior durability arising from viscous dissipation over SLIPS‐based SWs remains a great challenge that needs to be addressed. Here, an ultra‐robust all‐solid‐state superhydrophobic SW is reported namely electric‐actuated reconfigurable shape memory shutter (EA‐RSMS) via a hybrid approach of laser ablation and soft transfer. Thanks to electrothermal effect of underlying silver nanowires heater, EA‐RSMS can be dynamically glazing by switching the surface shutters between bent mode (the transmittance of 10.8%) and erect one (the transmittance of 56.6%) within 60?s in situ. Synergistically, EA‐RSMS motivates the reversible transition between sticky state (sliding angle of 24°) and slippery one (sliding angle of 8°) by alternate Joule‐heating/pressing operation. Fundamental physics renders to clarify the effect of shutters topography on the hysteresis and light performance. Last but not the least, by utilizing the optimized EA‐RSMS shelter, indoor thermal‐comfort regulation, visibility encoding together with angle‐variable display are deployed. Current superhydrophobic EA‐RSMS with robust durability, novel tuning modulation, fast electric‐sensitivity, and optical angle‐dependence holds promising potential in self‐cleaning smart windows, energy‐saving buildings, anti‐voyeurism, etc.(#br)Smart windows (SWs) grant significant avenue for harnessing the global energy crisis. This work unfolds a new class of SW namely all‐solid‐state superhydrophobic electric‐actuated reconfigurable shape‐memory shutters (EA‐RSMS) by femtosecond laser. The designed EA‐RSMS with tunable wettability, novel tuning modulation, fast electric‐sensitivity, and optical angle‐dependence holds promising potential in self‐cleaning smart windows, energy‐saving buildings, anti‐voyeurism, etc.

• 单位
  合肥工业大学