Department of Microsystems Engineering, University of Freiburg , Georges-Köhler-Allee 103, 79110 Freiburg, Germany.
Langmuir. 2017 May 16;33(19):4833-4839. doi: 10.1021/acs.langmuir.7b00814. Epub 2017 May 1.
The nanostructures that are required to generate superhydrophobic surfaces are always sensitive to shear and are easily damaged, especially by scratching with sharp objects. As a result of this destruction, the water repellency will be lost. We introduce a novel approach to restoring the original surface properties after mechanical damage. In this approach, the damaged layer is shed like the skin of a snake. This is demonstrated with a three-layer stack as a proof-of-principle system: when the original, superhydrophobic surface layer is damaged, this leads to the dissolution of a sacrificial layer below it. Thus, the damaged layer is shed, a new unscathed surface is uncovered, and superhydrophobicity can easily be restored after a short washing.
生成超疏水表面所需的纳米结构对剪切总是很敏感，很容易损坏，尤其是被尖锐物体划伤。由于这种破坏，疏水性将会丧失。我们提出了一种在机械损伤后恢复原始表面性能的新方法。在这种方法中，损坏的层像蛇皮一样剥落。我们使用一个三层堆叠作为原理验证系统来证明这一点：当原始的超疏水表面层被损坏时，这会导致下面的牺牲层溶解。因此，损坏的层剥落，一个新的未受损的表面暴露出来，并且在短时间的清洗后，很容易恢复超疏水性。
