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Reversible high-pressure carbon nanotube vessel

机译:可逆高压碳纳米管容器

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摘要

Applying a full pressure loop, i.e., loading and unloading, on a nanocrystal with in situ observation remains a challenge to experimentalists up until now. Using a multiwalled carbon nanotube, we realize the pressure loop acting on a Fe_3C nanocrystal (with peak value 20 GPa) by electron-beam irradiation with in situ observations inside transmission electron microscopy at 500 ℃/ambient temperature. Using density-functional theory calculations, we attribute the unloading process to the formation of one dangling-bond single vacancies under the electron-beam irradiation at room temperature. A theoretical model is presented to understand the process and the results agree well with the experimental measurements.
机译:迄今为止,在纳米晶体上进行全压回路(即加载和卸载)并进行原位观察仍然是实验人员面临的挑战。使用多壁碳纳米管,我们在500℃/环境温度下通过电子束辐照和在透射电子显微镜内的原位观察,实现了作用于Fe_3C纳米晶体(峰值20 GPa)的压力环。使用密度泛函理论计算,我们将卸载过程归因于室温下电子束辐照下一个悬挂键单空位的形成。提出了一个理论模型来理解该过程,并且结果与实验测量结果非常吻合。

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  • 来源
    《Physical review》 |2010年第23期|P.235420.1-235420.5|共5页
  • 作者单位

    Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;

    rnDepartment of Mechanical and Aerospace Engineering, Monash University, Clayton, Victoria 3800, Australia;

    rnDepartment of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA;

    rnSchool of Civil Engineering, University of Sydney, Sydney, New South Wales 2006, Australia;

    rnBeijing National Center for Electron Microscopy, Tsinghua University, Beijing 100084, China Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

    rnDepartment of Chemical Engineering, Tsinghua University, Beijing 100084, China;

    rnBeijing National Center for Electron Microscopy, Tsinghua University, Beijing 100084, China Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

    rnDepartment of Mechanical Engineering, Tsinghua University, Beijing 100084, China;

    rnDepartment of Mechanical Engineering, Tsinghua University, Beijing 100084, China;

    rnDepartment of Engineering Mechanics, Tsinghua University, Beijing 100084, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    electron and positron radiation effects;

    机译:电子和正电子辐射效应;

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