Mechanical Properties of Highly Porous Super Liquid‐Repellent Surfaces
Mechanical Properties of Highly Porous Super Liquid‐Repellent Surfaces
复制标题
DOI：
10.1002/adfm.201600627
复制
发表时间：
2016-07
影响因子：
19
通讯作者：
Maxime Paven;R. Fuchs;T. Yakabe;D. Vollmer;M. Kappl;A. Itakura;H. Butt
中科院分区：
文献类型：
--
作者：
Maxime Paven;R. Fuchs;T. Yakabe;D. Vollmer;M. Kappl;A. Itakura;H. Butt
具有自清洁性能的表面在许多应用中都是可取的。从概念上讲，超疏水表面要求在纳米或微米尺度上具有高度的渗透性，这就使得它们在机械上是脆弱的。优化机械强度和拒液性的平衡是应用的一个核心方面。然而，多孔、超疏水表面的定量力学测试是具有挑战性的，因为它们在不同的长度尺度上具有较高的表面粗糙度和较低的应力容忍度。因此，机械测试通常是定性进行的。在这里，我们用铅笔和手指划痕定性地研究了煤烟模板超疏水表面的力学响应，用原子力显微镜、胶体探针力测量和纳米压痕定量地研究了它们的力学响应。特别是，胶体探针力的测量涵盖了相关的力和长度尺度。对有效弹性模数、塑性功W、有效粘结功W进行了量化。通过将力测量的定量信息与表面润湿性的测量相结合，可以通过调节反应参数来平衡机械强度与低润湿性。
Surfaces with self‐cleaning properties are desirable for many applications. Conceptually, super liquid‐repellent surfaces are required to be highly porous on the nano‐ or micrometer scale, which inherently makes them mechanically weak. Optimizing the balance of mechanical strength and liquid repellency is a core aspect toward applications. However, quantitative mechanical testing of porous, super liquid‐repellent surfaces is challenging due to their high surface roughness at different length scales and low stress tolerance. For this reason, mechanical testing is often performed qualitatively. Here, the mechanical responses of soot‐templated super liquid‐repellent surfaces are studied qualitatively by pencil and finger scratching and quantitatively by atomic force microscopy, colloidal probe force measurements, and nanoindentation. In particular, colloidal probe force measurements cover the relevant force and length scales. The effective elastic modulus, the plastic work Wplastic and the effective adhesive work Wadhesive are quantified. By combining quantitative information from force measurements with measurements of surface wetting properties, it is shown that mechanical strength can be balanced against low wettability by tuning the reaction parameters.