期刊
ACS NANO
卷 14, 期 1, 页码 611-619出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b07192
关键词
bioinspired material; mica; aramid nanofiber; toughness; electrical insulation
类别
资金
- National Natural Science Foundation of China [51973054]
- High-level Innovative Talent Project in Hunan Province [2018RS3055]
- Natural Science Foundation of Hunan province [2019JJ40069]
The rapid development of modern electrical equipment toward miniaturization and high power puts forward stringent requirements to the mechanical reliability, dielectric property, and heat resistance of electrical insulating materials. Simultaneous integration of all these properties for mica-based materials remains unresolved. Herein, inspired by the three-dimensional (3D) chitin nanofiber framework within the layered architecture of natural nacre, we report a large-area layered mica-based nanopaper containing a 3D aramid nanofiber framework, which is prepared by a sol-gel-film transformation process. The coupling of 3D aramid nanofiber framework and oriented mica nanoplatelets imparts the nanopaper with good mechanical strength, particularly outstanding ductility (close to 80%) and toughness (up to 109 MJ m(-3)), which are 4-240 and 6-220 times higher than those of all other nacre-mimetics. Meanwhile, the excellent mechanical properties are integrated with high dielectric strength (164 kV min(-1)), excellent heat resistance (T-g = 268 degrees C), good solvent resistance, and nonflammability, much better than conventional mica-based materials. Additionally, we successfully demonstrate its continuous production in the form of nanotape. The fabulous multiproperty combination and continuous production capability render the mica-based nanopaper a very promising electrical insulating material in miniaturized high-power electrical equipment.
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