Self-healing superhydrophobic coatings have garnered widespread attention in recent years. However, developing rapid, multi-cycle, and multifunctional self-healing superhydrophobic coatings remains a significant challenge. In this study, we designed and synthesized a core–shell structured porous nanosphere with hollow mesoporous silica (HMS) as the core, loaded with octadecylamine (ODA) inside, and coated with polydopamine (PDA) on the HMS surface. Finally, nanosilver (AgNPs) and ODA were loaded on the outer surface, and the resulting material was formulated into a new type of sunlight-responsive, self-healing, and antibacterial coating via an adhesive. This coating exhibits multi-cycle and rapid self-repair properties under sunlight exposure and achieves superhydrophobicity (WCA = 157.3°). The multi-cycle self-healing process is mainly attributed to the large specific surface area of HMS (with a specific surface area of 521.27 m²/g), which allows for the loading of more low surface energy ODA. Additionally, due to the low melting point of ODA and the synergistic photothermal effect of PDA and AgNPs, ODA can migrate to the damaged surface more quickly, endowing the coating with faster self-healing capabilities. Moreover, the prepared coating also possesses excellent antibacterial properties, ensuring a reduction in biological contamination and extending the service life of the superhydrophobic coating.

中文翻译：

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基于 ODA/Ag-PDA@HMS-ODA 的自然光诱导自修复抗菌超疏水涂层


近年来，自修复超疏水涂层引起了广泛关注。然而，开发快速、多循环和多功能的自修复超疏水涂层仍然是一个重大挑战。在这项研究中，我们设计合成了一个以空心介孔二氧化硅 （HMS） 为核心，内部负载十八烷胺 （ODA），并在 HMS 表面涂有聚多巴胺 （PDA） 的核壳结构多孔纳米球。最后，纳米银 （AgNPs） 和 ODA 被负载在外表面，所得材料通过粘合剂配制成一种新型的阳光响应、自修复和抗菌涂层。该涂层在阳光照射下表现出多循环和快速自修复性能，并实现超疏水性 （WCA = 157.3°）。多循环自愈过程主要归因于 HMS 的大比表面积（比表面积为 521.27 m²/g），这允许加载更多低表面能 ODA。此外，由于 ODA 的低熔点以及 PDA 和 AgNP 的协同光热效应，ODA 可以更快地迁移到受损表面，从而赋予涂层更快的自修复能力。此外，制备的涂层还具有出色的抗菌性能，确保减少生物污染并延长超疏水涂层的使用寿命。