Wetting Resistance at Its Topographical Limit: The Benefit of Mushroom and Serif T Structures
Wetting Resistance at Its Topographical Limit: The Benefit of Mushroom and Serif T Structures
复制标题
DOI：
10.1021/la304179b
复制
发表时间：
2013-01-29
期刊：
影响因子：
3.9
通讯作者：
Werner, Carsten
中科院分区：
文献类型：
--
作者：
Hensel, Rene;Helbig, Ralf;Werner, Carsten
跳尾虫（跳虫）是一种无翅节肢动物，适合在暂时被雨水淹没的栖息地进行皮肤呼吸。它们立即形成腹甲，保护它们在浸入水中甚至低表面张力液体（例如烷烃）时免于窒息。最近的实验研究表明，这种腹甲具有抗塌陷的高压能力。在这项工作中，通过透射电子显微镜研究了 Orthonychiurus stachianus 的皮肤切片。显微照片揭示了具有特征悬垂的空腔侧壁轮廓。它们通过多项式拟合，以便对突破压力（即防止腹甲塌陷的屏障）进行分析和数值计算。此外，具有明确几何形状的模型轮廓用于将获得的结果置于上下文中，并为最稳健的表面结构制定通用设计原则。我们的结果表明，悬垂结构的截面轮廓对于低表面张力液体形成稳健的异质润湿状态具有决定性作用，从而实现全疏性。此外，蘑菇形和衬线 T 形结构的设计原理为具有耐高压性的全疏表面铺平了道路，而与固体表面化学性质无关。
Springtails (Collembola) are wingless arthropods adapted to cutaneous respiration in temporarily rain-flooded habitats. They immediately form a plastron, protecting them against suffocation upon immersion into water and even low-surface-tension liquids such as alkanes. Recent experimental studies revealed a high-pressure resistance of such plastrons against collapse. In this work, skin sections of Orthonychiurus stachianus are studied by transmission electron microscopy. The micrographs reveal cavity side-wall profiles with characteristic overhangs. These were fitted by polynomials to allow access for analytical and numerical calculations of the breakthrough pressure, that is, the barrier against plastron collapse. Furthermore, model profiles with well-defined geometries were used to set the obtained results into context and to develop a general design principle for the most robust surface structures. Our results indicate the decisive role of the sectional profile of overhanging structures to form a robust heterogeneous wetting state for low-surface-tension liquids that enables the omniphobicity. Furthermore, the design principles of mushroom and serif T structures pave the way for omniphobic surfaces with a high-pressure resistance irrespective of solid surface chemistry.