Jump to main content
Jump to site search

Issue 26, 2019
Previous Article Next Article

Periodic buckling and grain boundary slips in a colloidal model of solid friction

Author affiliations

Abstract

The intermittent ‘stick-slip’ dynamics in frictional sliding of solid bodies is common in everyday life and technology. This dynamics has been widely studied on a macroscopic scale, where the thermal motion can usually be neglected. However, the microscopic mechanisms behind the periodic stick-slip events are yet unclear. We employ confocal microscopy of colloidal spheres, to study the frictional dynamics at the boundary between two quasi-two-dimensional (2D) crystalline grains, with a single particle resolution. Such unprecedentedly-detailed observations of the microscopic-scale frictional solid-on-solid sliding have never been previously carried out. At this scale, the particles undergo an intense thermal motion, which masks the avalanche-like nature of the underlying frictional dynamics. We demonstrate that the underlying sliding dynamics involving out-of-plane buckling events, is intermittent and periodic, like in macroscopic friction. However, unlike in the common models of friction, the observed periodic frictional dynamics is promoted, rather than just suppressed, by the thermal noise, which maximizes the entropy of the system.

Graphical abstract: Periodic buckling and grain boundary slips in a colloidal model of solid friction

Back to tab navigation

Supplementary files

Article information


Submitted
31 Mar 2019
Accepted
13 Jun 2019
First published
14 Jun 2019

Soft Matter, 2019,15, 5227-5233
Article type
Paper

Periodic buckling and grain boundary slips in a colloidal model of solid friction

E. Janai, A. V. Butenko, A. B. Schofield and E. Sloutskin, Soft Matter, 2019, 15, 5227
DOI: 10.1039/C9SM00654K

Social activity

Search articles by author

Spotlight

Advertisements