Li Wei, Ni Xingxing, Zhang Xinhai, Lei Yang, Guo Jie, Jin Jie, You Bo
Department of Materials Science and the Advanced Films Research Center of the China Educational Ministry, Fudan University, Shanghai 200433, P. R. China.
Shanghai Certificate Engineering Technology Research Center, Shanghai Banknote Printing Co. Ltd., Shanghai 20063, P. R. China.
ACS Appl Mater Interfaces. 2020 Oct 21;12(42):48101-48108. doi: 10.1021/acsami.0c12266. Epub 2020 Oct 9.
Self-healing superhydrophobic coatings are attracting interest, but it still remains a great challenge to develop facile and fast self-healing strategies for superhydrophobic coatings. In this work, a novel environmentally friendly self-healing superhydrophobic coating based on an ultraviolet (UV)/near-infrared light (NIR) dual-responsive action was fabricated by blending UV-responsive microcapsules with NIR-responsive carbon nanoparticles (NPs), hydrophobic silica NPs, and waterborne silicone latex. The UV-responsive microcapsules were simply prepared through the electrostatic adsorption of negatively charged TiO NPs onto a positively charged microcapsule surface. The UV-NIR dual-responsive properties were mainly reflected in the healing of the superhydrophobic property for coatings through NIR or UV light irradiation. The self-healing process could be repeated many times, which can be attributed to the continued release of fluorine silane (FAS-13) loaded in the UV-responsive microcapsules to the coating surface. The combinations of NIR and UV responses endow the coating with the characteristics of fast healing and large-area healing when damaged by the external environment. In addition, the self-healing superhydrophobic coating film has excellent oil, corrosion, and wear resistance, satisfying the requirements for realistic outdoor applications.
自修复超疏水涂层正引起人们的关注，但开发简便快速的超疏水涂层自修复策略仍然是一个巨大的挑战。在这项工作中，通过将紫外线（UV）响应性微胶囊与近红外（NIR）响应性碳纳米颗粒（NPs）、疏水性二氧化硅 NPs 和水性硅氧烷乳液混合，制备了一种基于紫外线/近红外光（NIR）双响应作用的新型环保自修复超疏水涂层。紫外线响应性微胶囊通过带负电荷的 TiO NPs 在带正电荷的微胶囊表面的静电吸附简单制备。UV-NIR 双响应特性主要体现在通过近红外或紫外线照射对涂层超疏水性能的修复上。自修复过程可以重复多次，这可归因于负载在紫外线响应性微胶囊中的氟硅烷（FAS-13）持续释放到涂层表面。近红外和紫外线响应的结合使涂层在受到外部环境破坏时具有快速修复和大面积修复的特性。此外，自修复超疏水涂膜具有优异的耐油、耐腐蚀和耐磨性能，满足实际户外应用的要求。
