Giant slip length at a supercooled liquid-solid interface
Suzanne Lafon1, Alexis Chennevière2, Frédéric Restagno1
1Paris-Saclay University, CNRS, Solid State Physics Laboratory, 91405 Orsay, France.
Physical Review. E
|March 18, 2023
Summary
Investigating supercooled liquids reveals that interfacial friction can decrease with temperature, significantly increasing slip length. This phenomenon, termed superlubricity, is linked to surface crystallization and structural incommensurability.
Area of Science:
- Physics
- Materials Science
- Physical Chemistry
Background:
- Temperature's influence on liquid-solid interface friction and slip is well-studied.
- The role of temperature on slip near the glass transition remains less explored.
Purpose of the Study:
- To investigate the effect of temperature on friction and slip length in a supercooled liquid at the liquid-solid interface.
- To explore the behavior of a bidisperse atomic fluid near its glass transition.
Main Methods:
- Molecular dynamics simulations were employed.
- A bidisperse atomic fluid interacting with a smooth apolar wall was simulated across a range of temperatures.
Main Results:
- At high temperatures, viscosity, friction, and slip length followed an Arrhenius law.
- In the supercooled state, viscosity became super-Arrhenian, while friction decreased, leading to increased slip length (superlubricity).
- Superlubricity was rationalized by surface crystallization and structural incommensurability.
Conclusions:
- Supercooled liquids exhibit unique friction and slip behaviors distinct from high-temperature liquids.
- Surface crystallization and interfacial incommensurability drive superlubricity in supercooled liquids.
- Experimental studies on supercooled liquid slip on low surface energy solids are recommended.
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