Sui Shanying, Quan Huafeng, Wang Jingxing, Lu Yufang, Yang Yufan, Sheng Yuhan, Sun Zhifang, Zhang Yi
Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, P. R. China.
College of Materials Science and Engineering, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha, 410082, P. R. China.
Adv Sci (Weinh). 2025 Jan;12(4):e2410938. doi: 10.1002/advs.202410938. Epub 2024 Nov 29.
Advanced aerogels hold immense potential in thermal insulation. However, achieving high environmental adaptability aerogel insulators with elasticity, hydrophobicity, flame-retardancy, and low temperature tolerance remains a significant challenge. Inspired by a "brick-mortar-binder" biomimetic texture, a layered double hydroxide/carboxylated cellulose nanofibers/Si-O-Si (LCS) hybrid aerogel is developed by bottom-up freeze-drying. Owing to the distinct building blocks and organized structure, as-prepared LCS hybrid aerogel exhibits impressive mechanical elasticity, cycling stability at an extremely low temperature (-196 °C), hydrophobicity, and flame-retardancy (LOI = 44.6%, UL-94: V-0). Additionally, the incorporation of layered double hydroxide effectively improves the thermal insulation property (thermal conductivity = 0.0296 W·m·K). These distinctive features make the LCS hybrid aerogel highly promising for thermal management applications in extreme conditions, such as in pipelines for transporting liquid nitrogen and liquefied natural gas.
先进气凝胶在隔热方面具有巨大潜力。然而，制备具有弹性、疏水性、阻燃性和低温耐受性的高环境适应性气凝胶隔热材料仍然是一项重大挑战。受“砖-砂浆-粘合剂”仿生结构的启发，通过自下而上的冷冻干燥法制备了一种层状双氢氧化物/羧化纤维素纳米纤维/Si-O-Si（LCS）杂化气凝胶。由于独特的构建单元和有序结构，所制备的LCS杂化气凝胶具有令人印象深刻的机械弹性、在极低温（-196°C）下的循环稳定性、疏水性和阻燃性（极限氧指数=44.6%，UL-94：V-0）。此外，层状双氢氧化物的加入有效地提高了隔热性能（热导率=0.0296W·m·K）。这些独特特性使得LCS杂化气凝胶在极端条件下的热管理应用中极具前景，例如在液氮和液化天然气输送管道中。
