Low-friction nanoscale linear bearing realized from multiwall carbon nanotubes
Low-friction nanoscale linear bearing realized from multiwall carbon nanotubes
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DOI：
10.1126/science.289.5479.602
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发表时间：
2000-07-28
期刊：
影响因子：
56.9
通讯作者：
Zettl, A
中科院分区：
文献类型：
--
作者：
Cumings, J;Zettl, A
我们演示了多壁碳纳米管的可控可逆伸缩，从而实现了超低摩擦纳米级线性轴承和恒力纳米弹簧。在高分辨率透射电子显微镜下对单个定制纳米管进行的原位测量显示了预期的基于范德华能量的收缩力，并使我们能够对嵌套纳米管之间的静态和动态壁间摩擦力进行定量限制。在原子尺度上，可伸缩纳米管段的反复伸展和收缩没有磨损或疲劳。因此，这些纳米管可能构成近乎完美的无磨损表面。
We demonstrate the controlled and reversible telescopic extension of multiwall carbon nanotubes, thus realizing ultralow-friction nanoscale linear bearings and constant-force nanosprings. Measurements performed in situ on individual custom-engineered nanotubes inside a high-resolution transmission electron microscope demonstrated the anticipated van der Waals energy-based retraction force and enabled us to place quantitative limits on the static and dynamic interwall frictional forces between nested nanotubes. Repeated extension and retraction of telescoping nanotube segments revealed no wear or fatigue on the atomic scale. Hence, these nanotubes may constitute near perfect, wear-free surfaces.