@article{Zhang2026, 
author = {Mingxuan Zhang and Yuechang Lian and Haonan Liu and Siyuan Xiang and Yutao Wang and Bo Yang and Shengyang Tao and Michael Kappl and Wendong Liu},
title = {Robust, biomimetic, superhydrophobic coating with flame-retardant properties and excellent self-extinguishing performance},
year = {2026},
journal = {Nano Research},
volume = {19},
number = {5},
pages = {94908394},
keywords = {coating, superhydrophobic, biomimetic, flame-retardant, spray coating},
url = {https://www.sciopen.com/article/10.26599/NR.2026.94908394},
doi = {10.26599/NR.2026.94908394},
abstract = {Flame-retardant coatings are crucial for safety. However, flame-retardant materials are often hydrophilic, causing them to easily dissolve in high-humidity environments, thereby significantly limiting their durability. Thus, the integration of water repellency and flame retardancy into a single coating is ideal for developing durable and flame-retardant materials. In this study, a robust skin-inspired double-layer coating was fabricated by using spray coating. An intumescent flame-retardant “dermis” layer, comprising ammonium polyphosphate (APP), polydopamine (PDA), and 1-[3-(trimethoxysilyl) propyl]urea (UPTMS), provides the primary heat insulation and flame retardancy functions. A superhydrophobic “epidermis” layer, constructed using silicone nanofilaments (Si NFs), poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), and triethoxy-1H,1H,2H,2H-heptadecafluorodecylsilane (PFDTS), protects flame-retardant materials in moist conditions. Owing to its intumescent effect, the obtained coating demonstrated excellent flame retardancy, with the fire self-extinguishing immediately after the removal of flame source. It achieves a limiting oxygen index (LOI) of 85.3% and significantly decreases the peak heat release rate (PHRR) and the fire growth index (FGI) of 59.20 kW·m−2 and 0.789 kW·m−2·s−1, respectively. The epidermal layer demonstrated outstanding superhydrophobicity and remarkable mechanical stability, with the water contact angle remaining above 160° after 1000 bending cycles between 90° and 180°. Together with the facile spray-coating process, the biomimetic design of this intumescent flame-retardant and superhydrophobic coating provides a feasible and sustainable strategy for constructing durable fireproofing materials.}
}