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yexuqing木虫之王 (文学泰斗)
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动态强度高达14 GPa的碳纳米管纤维
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动态强度高达14 GPa的碳纳米管纤维 ▲ 作者：XINSHI ZHANG, XUDONG LEI, XIANGZHENG JIA, TONGZHAO SUN, JIAJUN LUO, SHICHEN XU, ET AL. ▲ 链接： https://www.science.org/doi/10.1126/science.adj1082 ▲ 摘要： 高动态强度对于在高应变率环境中使用的纤维材料至关重要。碳纳米管纤维是最有前景的候选纤维之一。 采用优化分层结构的策略，研究组制备出动态强度为14 GPa且能量吸收性能优异的碳纳米管纤维。纤维的动态性能归因于高应变率加载过程中单个纳米管的同时断裂和冲击能量的离域；这些行为则归因于界面相互作用、纳米管排列和致密化的改善。 这项工作提出了一种在宏观尺度上利用单个碳纳米管强度的有效策略，并提供了新的机制见解。 ▲ Abstract： High dynamic strength is of fundamental importance for fibrous materials that are used in high–strain rate environments. Carbon nanotube fibers are one of the most promising candidates. Using a strategy to optimize hierarchical structures, we fabricated carbon nanotube fibers with a dynamic strength of 14 gigapascals (GPa) and excellent energy absorption. The dynamic performance of the fibers is attributed to the simultaneous breakage of individual nanotubes and delocalization of impact energy that occurs during the high–strain rate loading process; these behaviors are due to improvements in interfacial interactions, nanotube alignment, and densification therein. This work presents an effective strategy to utilize the strength of individual carbon nanotubes at the macroscale and provides fresh mechanism insights. Spin torque–driven electron paramagnetic resonance of a single spin in a pentacene molecule |
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