Xiao Kailu, Zhang Pengfei, Hu Dongmei, Huang Chenguang, Wu Xianqian
Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China.
Key Laboratory of Multifunctional and Smart Systems, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China.
Small. 2023 Sep;19(38):e2302403. doi: 10.1002/smll.202302403. Epub 2023 May 21.
The highest specific energy absorption (SEA) of interlocked micron-thickness carbon nanotube (IMCNT) films subjected to micro-ballistic impact is reported in this paper. The SEA of the IMCNT films ranges from 0.8 to 1.6 MJ kg , the greatest value for micron-thickness films to date. The multiple deformation-induced dissipation channels at the nanoscale involving disorder-to-order transition, frictional sliding, and entanglement of CNT fibrils contribute to the ultra-high SEA of the IMCNT. Furthermore, an anomalous thickness dependency of the SEA is observed, that is, the SEA increases with increasing thickness, which should be ascribed to the exponential growth in nano-interface that further boosts the energy dissipation efficiency as the film thickness increases. The results indicate that the developed IMCNT overcomes the size-dependent impact resistance of traditional materials and demonstrates great potential as a bulletproof material for high-performance flexible armor.
本文报道了受微弹道冲击的互锁微米厚碳纳米管（IMCNT）薄膜的最高比能量吸收（SEA）。IMCNT薄膜的SEA范围为0.8至1.6兆焦/千克，是迄今为止微米厚薄膜的最大值。纳米级的多种变形诱导耗散通道，包括无序到有序的转变、摩擦滑动和碳纳米管原纤维的缠结，促成了IMCNT的超高SEA。此外，观察到SEA存在反常的厚度依赖性，即SEA随厚度增加而增加，这应归因于纳米界面的指数增长，随着薄膜厚度增加，进一步提高了能量耗散效率。结果表明，所开发的IMCNT克服了传统材料尺寸依赖性的抗冲击性，并显示出作为高性能柔性装甲防弹材料的巨大潜力。
