Hierarchical or Not? Effect of the Length Scale and Hierarchy of the Surface Roughness on Omniphobicity of Lubricant-Infused Substrates
Hierarchical or Not? Effect of the Length Scale and Hierarchy of the Surface Roughness on Omniphobicity of Lubricant-Infused Substrates
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DOI：
10.1021/nl4003969
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发表时间：
2013-04-01
期刊：
影响因子：
10.8
通讯作者：
Aizenberg, Joanna
中科院分区：
文献类型：
--
作者：
Kim, Philseok;Kreder, Michael J.;Aizenberg, Joanna
注入润滑剂的织构化固体基材作为一类新型的全方位抗污材料和表面涂层，正引起人们极大的兴趣。我们调查的长度尺度和层次结构的底层基板的表面形貌的影响，他们的能力，以保持润滑剂在高剪切条件下，这是重要的应用相关的条件下保持非润湿性能。通过比较不同旋转速率下平坦、微米级、纳米级和分级纹理表面上的水和乙醇液滴的润滑剂损失、接触角滞后和滑动角（从100到10 000 rpm），我们表明，具有均匀纳米特征的润滑剂注入纹理表面提供了最耐剪切的液体排斥行为，与荷叶启发的超疏水表面不同，其通常有利于分级结构以改善压力稳定性和低接触角滞后。在这些发现的基础上，我们提出了通用的，低成本的，可扩展的方法来制造均匀的或区域图案化的纳米纹理涂层的任意材料和复杂的形状。在功能化和润滑之后，这些涂层显示出坚固的、耐剪切的全憎性行为、透明性和对高度污染介质的不污染特性。
Lubricant-infused textured solid substrates are gaining remarkable interest as a new class of omni-repellent nonfouling materials and surface coatings. We investigated the effect of the length scale and hierarchy of the surface topography of the underlying substrates on their ability to retain the lubricant under high shear conditions, which is important for maintaining nonwetting properties under application-relevant conditions. By comparing the lubricant loss, contact angle hysteresis, and sliding angles for water and ethanol droplets on flat, microscale, nanoscale, and hierarchically textured surfaces subjected to various spinning rates (from 100 to 10 000 rpm), we show that lubricant-infused textured surfaces with uniform nanofeatures provide the most shear-tolerant liquid-repellent behavior, unlike lotus leaf-inspired super-hydrophobic surfaces, which generally favor hierarchical structures for improved pressure stability and low contact angle hysteresis. On the basis of these findings, we present generalized, low-cost, and scalable methods to manufacture uniform or regionally patterned nanotextured coatings on arbitrary materials and complex shapes. After functionalization and lubrication, these coatings show robust, shear-tolerant omniphobic behavior, transparency, and nonfouling properties against highly contaminating media.