Issue 3, 2023

Frictionless nanohighways on crystalline surfaces


The understanding of friction at nano-scales, ruled by the regular arrangement of atoms, is surprisingly incomplete. Here we provide a unified understanding by studying the interlocking potential energy of two infinite contacting surfaces with arbitrary lattice symmetries, and extending it to finite contacts. We categorize, based purely on geometrical features, all possible contacts into three different types: a structurally lubric contact where the monolayer can move isotropically without friction, a corrugated and strongly interlocked contact, and a newly discovered directionally structurally lubric contact where the layer can move frictionlessly along one specific direction and retains finite friction along all other directions. This novel category is energetically stable against rotational perturbations and provides extreme friction anisotropy. The finite-size analysis shows that our categorization applies to a wide range of technologically relevant materials in contact, from adsorbates on crystal surfaces to layered two-dimensional materials and colloidal monolayers.

Graphical abstract: Frictionless nanohighways on crystalline surfaces

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Article information

Article type
18 Aug 2022
30 Nov 2022
First published
01 Dec 2022
This article is Open Access
Creative Commons BY license

Nanoscale, 2023,15, 1299-1316

Frictionless nanohighways on crystalline surfaces

E. Panizon, A. Silva, X. Cao, J. Wang, C. Bechinger, A. Vanossi, E. Tosatti and N. Manini, Nanoscale, 2023, 15, 1299 DOI: 10.1039/D2NR04532J

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