Recently, the switchable wetting surfaces between superhydrophobicity and superhydrophilicity have been widely studied. However, for almost all existing surfaces, especially inorganic responsive smart surfaces (TiO₂, ZnO, etc.), their surface microstructures are easily damaged under external force, thus resulting in the loss of superwetting switching and corresponding functions. Realizing the restoration of the damaged surface microstructures would be promising to solve the problem, but it has never been reported. Herein, we advance a fresh strategy to solve the above question by combining shape memory polymer (SMP) and TiO₂ nanoparticles. The as-prepared TiO₂ coated SMP arrays have an excellent responsivity between superhydrophobicity and superhydrophilicity under alternation of UV irradiation and storage in dark. After pressing, the collapsed arrays can only achieve the limited wetting switching between hydrophobicity and hydrophilicity under the same treating condition. Importantly, SMP can help the collapsed surface microstructure recover the initial morphology based on its shape memory effect, and realizing the restoration of superwetting switching. The restorability is ascribed to the cooperative effect between the shape memory property of the SMP and UV-induced surface chemistry variation of TiO₂ nanoparticles. Furthermore, the restorable functional application in droplet storage is also demonstrated. This work provides a fresh idea for designing new smart superwetting surfaces.

近来，已经对超疏水性和超亲水性之间的可切换润湿表面进行了广泛的研究。然而，对于几乎所有现有的表面，特别是无机响应性智能表面（TiO ₂，ZnO等），其表面微观结构在外力作用下很容易损坏，从而导致超湿开关和相应功能的丧失。实现受损表面微观结构的恢复将有望解决该问题，但从未有过报道。在这里，我们提出了一种新的策略，通过结合形状记忆聚合物（SMP）和TiO ₂纳米颗粒来解决上述问题。制备的TiO ₂涂膜SMP阵列在紫外线辐照和在黑暗中储存时，在超疏水性和超亲水性之间具有出色的响应性。压制后，塌陷的阵列只能在相同处理条件下实现疏水性和亲水性之间有限的润湿切换。重要的是，SMP可以帮助塌陷的表面微观结构基于其形状记忆效应恢复其初始形态，并实现超湿开关的恢复。可恢复性归因于SMP的形状记忆特性与TiO _2的紫外线诱导的表面化学变化之间的协同作用纳米粒子。此外，还展示了可恢复的功能在液滴存储中的应用。这项工作为设计新的智能超湿表面提供了新思路。