Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 13, Issue 38, Pages 8840-8844Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c02010
Keywords
-
Categories
Funding
- Dutch Research Council (NWO)
- Ministry of Economic Affairs
Ask authors/readers for more resources
When two macroscopic objects touch, the contact is composed of multiple surface asperities that deform under pressure. Applying a shear force breaks the initial contact and causes sliding. The use of a fluorogenic mechanophore allows for visualization and quantification of the local interfacial shear force. The macroscopic coefficient of friction accurately describes the microscopic friction.
When two macroscopic objects touch, the real contact typically consists of multiple surface asperities that are deformed under the pressure that holds the objects together. Application of a shear force makes the objects slide along each other, breaking the initial contacts. To investigate how the microscopic shear force at the asperity level evolves during the transition from static to dynamic friction, we apply a fluorogenic mechanophore to visualize and quantify the local interfacial shear force. When a contact is broken, the shear force is released and the molecules return to their dark state, allowing us to dynamically observe the evolution of the shear force at the sliding contacts. We find that the macroscopic coefficient of friction describes the microscopic friction well, and that slip propagates from the edge toward the center of the macroscopic contact area before sliding occurs. This allows for a local understanding of how surfaces start to slide.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available