Li Mingzhu, Xiao Lingbin, Guo Pengfei, Ni Haotian, Lu De, Xu Liang, Wang Lei, Zhang Jijun, Su Lei, Wang Hongjie
State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University, Xi'an 710049, China.
Nano Lett. 2023 Feb 22;23(4):1289-1297. doi: 10.1021/acs.nanolett.2c04475. Epub 2023 Feb 7.
Ceramic nanofibrous nanostructure-based sponges have attracted significant attention due to ultrahigh porosity, low thermal conductivity, large specific area, and chemical stability. From the regulation of the fiber itself to the construction method of 3D networks, efforts are being made to improve the mechanical properties of ceramic sponges for practical applications. So far resilient compressibility has been realized in ceramic nanofibrous-based sponges via structural design, but they still show brittle fracture under a more complex stress state. Herein, we introduced a highly aligned and interwoven SiN nanofiber sponge, which exhibits superflexibility, large break elongation (>80%), large-strain reversible stretch (20%), and good resistance to tensile fatigue. The ceramic sponge also displays reversible compressibility up to 60% strain, puncture resistance, high air filtration efficiency (>99.8%), and low pressure drop (38% of cotton fiber), making the ceramic sponge a high-performance wearable respirator to protect us from harm due to PM pollution and possible microorganisms.
基于陶瓷纳米纤维纳米结构的海绵由于具有超高孔隙率、低导热性、大比表面积和化学稳定性而备受关注。从纤维本身的调控到三维网络的构建方法，人们一直在努力改善陶瓷海绵的机械性能以实现实际应用。到目前为止，通过结构设计已在基于陶瓷纳米纤维的海绵中实现了弹性压缩性，但在更复杂的应力状态下它们仍表现出脆性断裂。在此，我们引入了一种高度排列且相互交织的SiN纳米纤维海绵，它具有超柔韧性、大断裂伸长率（>80%）、大应变可逆拉伸（20%）以及良好的抗拉伸疲劳性能。这种陶瓷海绵还表现出高达60%应变的可逆压缩性、抗穿刺性、高气滤效率（>99.8%）和低压降（棉纤维的38%），使得这种陶瓷海绵成为一种高性能的可穿戴呼吸器，可保护我们免受PM污染和可能的微生物的伤害。
