Shape-dependent friction scaling laws in twisted layered material interfaces

Weidong Yan, Xiang Gao, Wengen Ouyang*, Ze Liu, Oded Hod, Michael Urbakh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Static friction induced by moiré superstructures in twisted incommensurate finite layered material interfaces reveals unique double periodicity and lack of scaling with contact size. The underlying mechanism involves compensation of incomplete moiré tiles at the rim of rigid polygonal graphene flakes sliding atop fixed graphene or h-BN substrates. The scaling of friction (or lack thereof) with contact size is found to strongly depend on the shape of the slider and the relative orientation between its edges and the emerging superstructure, partially rationalizing scattered experimental data. A phenomenological analytical model is developed, which agrees well with detailed atomistic calculations. By carefully considering the edge orientation, twist angle, and sliding direction of the flake relative to the substrate, one should therefore be able to achieve large-scale superlubricity via shape tailoring.

Original languageEnglish
Article number105555
JournalJournal of the Mechanics and Physics of Solids
Volume185
DOIs
StatePublished - Apr 2024

Funding

FundersFunder number
Center in Tianjin
ISF-NSFC1586/17, 3191/19
Naomi Foundation
National Natural Science Foundation of China12102307, 11890673, 12172260
China Postdoctoral Science FoundationGZC20231978
Israel Science Foundation1141/18
Tel Aviv University
Wuhan University
Fundamental Research Funds for the Central Universities2042023kf0233, 2042022kf1177
Guangxi Key Research and Development Program2021BAA192

    Keywords

    • Friction scaling law
    • Interlayer potential
    • Layered materials
    • Moiré superlattice
    • Superlubricity
    • Twist angle

    Fingerprint

    Dive into the research topics of 'Shape-dependent friction scaling laws in twisted layered material interfaces'. Together they form a unique fingerprint.

    Cite this