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A smart friction control strategy enabled by CO2 absorption and desorption.

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Researchers demonstrate intelligent friction control in engineering applications by adjusting lubricant viscosity with carbon dioxide (CO2). Adding CO2 decreased friction, while releasing it increased friction, enabling tunable lubrication.

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Area of Science:

  • Tribology
  • Materials Science
  • Chemical Engineering

Background:

  • Intelligent friction control is crucial for engineering applications but remains challenging.
  • Investigating friction adjustment via lubricant viscosity control in lubricated contacts.

Purpose of the Study:

  • To explore the possibility of actively controlling friction in elastohydrodynamic lubrication (EHL) by modulating lubricant viscosity.
  • To utilize switchable ionic liquids for tunable friction applications.

Main Methods:

  • Employing a 1,8-Diazabicyclo (5.4.0) undec-7-ene (DBU)/glycerol mixture as a switchable ionic liquid lubricant.
  • Controlling lubricant viscosity by introducing and releasing carbon dioxide (CO2).
  • Measuring friction changes under elastohydrodynamic lubrication (EHL) conditions.

Main Results:

  • Friction decreased with increasing CO2 concentration, correlating with increased viscosity and film thickness.
  • Friction increased upon partial release of CO2, demonstrating reversibility.
  • The pressure-viscosity coefficient decreased with CO2 addition.

Conclusions:

  • Friction can be intelligently controlled in EHL regimes by adjusting the viscosity of DBU/glycerol ionic liquids with CO2.
  • This CO2-mediated viscosity modulation offers a novel approach for tunable lubrication and friction management.