Chemical and physical origins of friction on surfaces with atomic steps
Open Access
- 2 August 2019
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science Advances
- Vol. 5 (8), eaaw0513
- https://doi.org/10.1126/sciadv.aaw0513
Abstract
Friction occurs through a complex set of processes that act together to resist relative motion. However, despite this complexity, friction is typically described using a simple phenomenological expression that relates normal and lateral forces via a coefficient, the friction coefficient. This one parameter encompasses multiple, sometimes competing, effects. To better understand the origins of friction, here, we study a chemically and topographically well-defined interface between silica and graphite with a single-layer graphene step edge. We identify the separate contributions of physical and chemical processes to friction and show that a single friction coefficient can be separated into two terms corresponding to these effects. The findings provide insight into the chemical and topographic origins of friction and suggest means of tuning surfaces by leveraging competing frictional processes.Keywords
Funding Information
- National Science Foundation (1727571)
- National Science Foundation (1727356)
This publication has 46 references indexed in Scilit:
- Adhesion-dependent negative friction coefficient on chemically modified graphite at the nanoscaleNature Materials, 2012
- Frictional Characteristics of Atomically Thin SheetsScience, 2010
- Graphene: Status and ProspectsScience, 2009
- Adsorption Isotherm and Orientation of Alcohols on Hydrophilic SiO2 under Ambient ConditionsThe Journal of Physical Chemistry C, 2009
- Graphene-Based Liquid Crystal DeviceNano Letters, 2008
- Atomic-Scale Friction on Diamond: A Comparison of Different Sliding Directions on (001) and (111) Surfaces Using MD and AFMLangmuir, 2007
- Electromechanical Resonators from Graphene SheetsScience, 2007
- Dynamics of viscoplastic deformation in amorphous solidsPhysical Review E, 1998
- Calculation of an Atomically Modulated Friction Force in Atomic-Force MicroscopyEurophysics Letters, 1991
- Effect of contact deformations on the adhesion of particlesJournal of Colloid and Interface Science, 1975