How the Toughest Inorganic Fullerene Cages Absorb Shockwave Pressures in a Protective Nanocomposite: Experimental Evidence from Two In Situ Investigations.
How the Toughest Inorganic Fullerene Cages Absorb Shockwave Pressures in a Protective Nanocomposite: Experimental Evidence from Two In Situ Investigations.
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DOI：
10.1021/acsnano.7b02943
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发表时间：
2017-08
期刊：
影响因子：
17.1
通讯作者：
Fang Xu;Takamichi Kobayashi;Zhuxian Yang;T. Sekine;Hong Chang;Nannan Wang;Yongde Xia;Yanqiu Zhu
中科院分区：
文献类型：
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作者：
Fang Xu;Takamichi Kobayashi;Zhuxian Yang;T. Sekine;Hong Chang;Nannan Wang;Yongde Xia;Yanqiu Zhu
使用最坚硬的笼状无机富勒烯WS2 （IF-WS2）纳米颗粒制成的纳米复合材料可以通过吸收冲击波提供终极保护；然而，如果if - ws2纳米材料真的起作用，由于现有研究技术的限制，无法阐明复合材料中高速撞击的真实特征，它们在纳米复合材料中在正确的撞击时刻的行为和经历从未得到有效的研究。我们首先制造了Al基模型纳米复合材料，然后使用两种原位技术，以前所未有的时间分辨率，在撞击的确切时刻解锁了IF-WS2在其中的确切作用。研究发现，在冲击速度为1000 m/s时，IF-WS2的存在使Al和六方WS2血小板复合材料的冲击速度降低了100 m/s以上，压力降低了至少2 GPa。IF-WS2复合材料实现了有趣的非弹性冲击，并且优于其他参考复合材料，所有这些都源于通过吸收冲击波压力的“气球效应”。该研究不仅为了解复合材料的动态性能提供了基础，而且有利于防护纳米复合材料工程的发展。
Nanocomposites fabricated using the toughest caged inorganic fullerene WS2 (IF-WS2) nanoparticles could offer ultimate protection via absorbing shockwaves; however, if the IF-WS2 nanomaterials really work, how they behave and what they experience within the nanocomposites at the right moment of impact have never been investigated effectively, due to the limitations of existing investigation techniques that are unable to elucidate the true characteristics of high-speed impacts in composites. We first fabricated Al matrix model nanocomposites and then unlocked the exact roles of IF-WS2 in it at the exact moment of impact, at a time resolution that has never been attempted before, using two in situ techniques. We find that the presence of IF-WS2 reduced the impact velocity by over 100 m/s and in pressure by at least 2 GPa against those Al and hexagonal WS2 platelet composites at an impact speed of 1000 m/s. The IF-WS2 composites achieved an intriguing inelastic impact and outperformed other reference composites, all originating from the "balloon effect" by absorbing the shockwave pressures. This study not only provides fundamental understanding for the dynamic performance of composites but also benefits the development of protective nanocomposite engineering.