College of Materials Science and Engineering, South China University of Technology, Wushan Road, Tianhe District, Guangzhou 510640, PR China.
College of Materials Science and Engineering, South China University of Technology, Wushan Road, Tianhe District, Guangzhou 510640, PR China.
J Colloid Interface Sci. 2017 Dec 15;508:18-27. doi: 10.1016/j.jcis.2017.08.027. Epub 2017 Aug 10.
Superhydrophobic surfaces easily lose their excellent water-repellency after damages, which limit their broad applications in practice. Thus, the fabrication of superhydrophobic surfaces with excellent durability and thermal healing should be taken into consideration.
In this work, robust superhydrophobic surfaces with thermal healing were successfully fabricated by spin-coating method. To achieve superhydrophobicity, cost-less and fluoride-free polydimethylsiloxane (PDMS) was spin-coated on rough aluminum substrates.
After being spin-coated for one cycle, the superhydrophobic PDMS coated hierarchical aluminum (PDMS-H-Al) surfaces showed excellent tolerance to various chemical and mechanical damages in lab, and outdoor damages for 90days. When the PDMS-H-Al surfaces underwent severe damages such as oil contamination (peanut oil with high boiling point) or sandpaper abrasion (500g of force for 60cm), their superhydrophobicity would lose. Interestingly, through a heating process, cyclic oligomers generating from the partially decomposed PDMS acted as low-surface-energy substance on the damaged rough surfaces, leading to the recovery of superhydrophobicity. The relationship between the spin-coating cycles and surface wettability was also investigated. This paper provides a facile, fluoride-free and efficient method to fabricate superhydrophobic surfaces with thermal healing.
超疏水表面在受到损伤后很容易失去其优异的疏水性，这限制了它们在实际中的广泛应用。因此，制造具有优异耐久性和热修复功能的超疏水表面应该被考虑。
在这项工作中，通过旋涂法成功制备了具有热修复功能的坚固超疏水表面。为了实现超疏水性，使用廉价且无氟的聚二甲基硅氧烷（PDMS）旋涂在粗糙的铝基底上。
经过一轮旋涂后，具有分级结构的 PDMS 涂覆的超疏水铝（PDMS-H-Al）表面在实验室和户外 90 天的各种化学和机械损伤中表现出优异的耐受性。当 PDMS-H-Al 表面遭受严重损伤，如油污（沸点高的花生油）或砂纸磨损（500g 力 60cm）时，其超疏水性会丧失。有趣的是，通过加热过程，部分分解的 PDMS 生成的环状低聚物在受损的粗糙表面上充当低表面能物质，从而恢复超疏水性。还研究了旋涂循环次数与表面润湿性之间的关系。本文提供了一种简便、无氟且有效的方法来制备具有热修复功能的超疏水表面。
