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The effects of disordered edge and vanishing friction in microscale structural superlubric graphite contact

Author

Listed:
  • Hengqian Hu

    (Tsinghua University
    Tsinghua University
    Tsinghua University)

  • Jin Wang

    (Tsinghua University
    International School for Advanced Studies (SISSA))

  • Kaiwen Tian

    (Research Institute of Tsinghua University in Shenzhen)

  • Quanshui Zheng

    (Tsinghua University
    Research Institute of Tsinghua University in Shenzhen
    Tsinghua University)

  • Ming Ma

    (Tsinghua University
    Tsinghua University
    Tsinghua University
    Research Institute of Tsinghua University in Shenzhen)

Abstract

Structural superlubricity (SSL), a state of ultralow friction and no wear between two solid surfaces in contact, offers a fundamental solution for reducing friction and wear. Recent studies find that the edge pinning of SSL contact dominates the friction. However, its nature remains mysterious due to the lack of direct characterizations on atomic scale. Here, for microscale graphite mesa, we unambiguously reveal the atomic structure and chemical composition of the disordered edge. The friction stress for each contact condition, namely, edge/edge, edge/surface, and surface/surface contacts are quantified, with the ratio being 104:103:1. The mechanism is revealed by all-atom molecular dynamic simulations, which reproduce the measured friction qualitatively. Inspired by such understanding, through fabricating SixNy caps with tensile stress, we further eliminate the friction caused by the edges through disengaging the edges from the substrate. As a result, an SSL contact with ultralow friction stress of 0.1 kPa or lower is achieved directly.

Suggested Citation

  • Hengqian Hu & Jin Wang & Kaiwen Tian & Quanshui Zheng & Ming Ma, 2024. "The effects of disordered edge and vanishing friction in microscale structural superlubric graphite contact," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-55069-1
    DOI: 10.1038/s41467-024-55069-1
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    References listed on IDEAS

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    1. Oded Hod & Ernst Meyer & Quanshui Zheng & Michael Urbakh, 2018. "Structural superlubricity and ultralow friction across the length scales," Nature, Nature, vol. 563(7732), pages 485-492, November.
    2. Andrea Vanossi & Clemens Bechinger & Michael Urbakh, 2020. "Structural lubricity in soft and hard matter systems," Nature Communications, Nature, vol. 11(1), pages 1-11, December.
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