Institute of Toxicology and Genetics, Karlsruhe Institute of Technology, 76344, Eggenstein-Leopoldshafen, Germany.
State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 200237, Shanghai, P. R. China.
Adv Mater. 2018 Nov;30(45):e1803890. doi: 10.1002/adma.201803890. Epub 2018 Aug 30.
The ability to create superoleophobic surfaces repellent toward low-surface-tension liquids is important for various applications, and has been recently demonstrated using re-entrant or doubly re-entrant microtopography. Liquid droplets on such surfaces feature composite liquid-solid-air interfaces, whereas composite liquid-lubricant-air interfaces would have potential for additional repellency. Here, the development of a novel slippery superoleophobic surface with low adhesion is demonstrated via combining doubly re-entrant microtopography with slippery lubricant-infused porous surfaces. This is realized by using 3D direct laser writing to fabricate doubly re-entrant micropillars with dedicated nanostructures on top of each pillar. The top nanostructures stabilize the impregnated slippery lubricant, while the re-entrant geometry of the micropillars prevents lubricant from spreading. The slippery layer reduces the adhesion of liquid to the pillars, as proved using scanning droplet adhesion microscopy (SDAM), while the doubly re-entrant micropillars make the surface superoleophobic. This novel interface combining two extremes, superoleophobicity and slippery lubricant-infused surface, is of importance for designing superoleophobic and superhydrophobic surfaces with advanced liquid repellent, anti-icing, or anti-fouling properties.
具有低表面能液体排斥性的超疏油表面的制备能力在各种应用中都很重要，最近已经通过使用内凹或双重内凹微形貌来实现。在这种表面上，液滴具有复合的液-固-气界面，而复合的液-润滑剂-气界面则具有额外的排斥潜力。在这里，通过将双重内凹微形貌与光滑的含润滑剂多孔表面相结合，展示了一种具有低附着力的新型超疏油表面的制备方法。这是通过使用 3D 直接激光写入在每个微柱的顶部制造具有专用纳米结构的双重内凹微柱来实现的。顶部纳米结构稳定了注入的光滑润滑剂，而微柱的内凹几何形状防止了润滑剂的扩散。光滑层降低了液体对微柱的附着力，这一点通过扫描液滴附着显微镜 (SDAM) 得到了证明，而双重内凹微柱则使表面具有超疏油性。这种将两个极端——超疏油性和光滑的含润滑剂表面——结合在一起的新型界面，对于设计具有先进的液体排斥性、抗结冰或抗污染性能的超疏油和超疏水表面非常重要。
