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Giant slip length at a supercooled liquid-solid interface.

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|March 18, 2023
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Summary
This summary is machine-generated.

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.

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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.