The design and exploitation of highly fire-safe aerogel with ultrasensitive fire-warning response and highly efficient thermal management capabilities are urgently needed to protect firefighters from burn injuries during fire operations and rescue. Herein, an ultralight temperature-triggered fire-warning aerogel composited of polyethylene glycol (PEG)@modified wood powder (MW)/amino-functionalized carbon nanotube (A-CNT)/calcium alginate (CA) (abbreviated as P@MW-A-CA) was fabricated. Benefiting the rapid decrease in electrical resistance of A-CNT at high temperatures, P@MW-A-CA achieved an ultrafast fire warning response time of ∼2.03 s when exposed to fire. Meanwhile, PEG was encapsulated into MW and acted as microtubule phase-change material (P@MW) in aerogel to effectively delay the heat penetration into P@MW-A-CA. The stiff MW served as the backbone endowed the fire-warning aerogel a “stiff-soft” structure that increased the mechanical resilience. P@MW-A-CA achieve flyweight density (0.038 g/cm³), low thermal conductivity (0.06233 ± 0.0012 W/m⋅K), and outstanding self-extinguishment (<1.02 s). This work provides an environmental friendliness approach to design an ultralight early fire-warning aerogel in firefighting clothing for enhancing the fire safety of firefighters.

迫切需要设计和开发具有超灵敏火灾预警响应和高效热管理能力的高度防火气凝胶，以保护消防员在火灾行动和救援过程中免受烧伤。在此，一种由聚乙二醇复合的超轻温度触发火灾预警气凝胶制备了(PEG)@改性木粉(MW)/氨基功能化碳纳米管(A-CNT)/海藻酸钙(CA)（简称P@MW-A-CA）。得益于 A-CNT 在高温下电阻的快速降低，P@MW-A-CA 在暴露于火灾时实现了约 2.03 秒的超快火灾预警响应时间。同时，PEG被封装在MW中，作为气凝胶中的微管相变材料（P@MW），有效地延缓了热量对P@MW-A-CA的渗透。坚硬的 MW 作为骨架赋予了防火气凝胶一种“刚软”结构，从而增加了机械弹性。P@MW-A-CA达到飞重密度（0.038 g/cm ³)、低热导率 (0.06233 ± 0.0012 W/m⋅K) 和出色的自熄性 (<1.02 s)。这项工作提供了一种环境友好的方法来设计一种用于消防服的超轻早期火灾预警气凝胶，以提高消防员的消防安全。