Control of surface wettability is very important and useful for many industrial applications, and can be realized by controlling surface chemistry and microstructure simultaneously. Here, we present a facile laser-based surface texturing method to achieve switchable wettability control on titanium surface. The experimental results indicate that the laser-treated surfaces became superhydrophilic immediately upon laser texturing. Using alternate low-temperature heat treatment and UV irradiation, the wettability of the laser-treated surface could be efficiently switched between superhydrophilicity and superhydrophobicity for many times. Surface morphology and chemistry analyses confirm that the reversible wettability transition should be attributed to the combined effect of the dual-scale surface structure and controllable surface chemistry. Using the laser-based wettability control method, a water collection device was fabricated and demonstrated by a superhydrophobic-superhydrophilic hybrid surface pattern. The developed method could enable a practical throughput for large-area processing, and endow various industrial applications.

表面润湿性的控制对于许多工业应用非常重要且有用，并且可以通过同时控制表面化学和微观结构来实现。在这里，我们提出了一种基于激光的简便表面纹理化方法，以实现对钛表面的可切换润湿性控制。实验结果表明，经激光纹理化后，经激光处理的表面立即变为超亲水性。使用交替的低温热处理和紫外线照射，可以多次有效地在超亲水性和超疏水性之间切换激光处理过的表面的润湿性。表面形态和化学分析证实，可逆的润湿性转变应归因于双尺度表面结构和可控表面化学的综合作用。使用基于激光的润湿性控制方法，制造了集水装置，并通过超疏水-超亲水混合表面图案进行了演示。所开发的方法可以实现大面积处理的实际产量，并赋予各种工业应用。