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Palladium Nanoparticle-Enabled Ultrathick Tribofilm with Unique Composition.

Chanaka Kumara1, Donovan N Leonard, Harry M Meyer

  • 1Department of Chemistry , University of Tennessee , Knoxville , Tennessee 37996 , United States.

ACS Applied Materials & Interfaces
|August 25, 2018
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Summary

Surface-functionalized palladium nanoparticles (PdNPs) create an ultrathick tribofilm, significantly reducing friction and wear in lubrication. This novel approach offers substantial improvements in lubricant performance.

Keywords:
frictionlubricantsnanoparticlestribofilmwear

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Area of Science:

  • Materials Science
  • Tribology
  • Nanotechnology

Background:

  • Lubrication research and development (R&D) can yield significant economic savings.
  • Surface-functionalized nanoparticles (NPs) show promise as lubricant additives for enhanced performance.
  • Existing NP lubricants form thin tribofilms (20-200 nm).

Purpose of the Study:

  • To investigate the tribofilm formation and lubricating properties of dodecanethiol-modified palladium NPs (PdNPs).
  • To evaluate the impact of PdNPs on friction and wear in steel-cast iron contact under boundary lubrication.
  • To analyze the composition and structure of the resultant tribofilm.

Main Methods:

  • Boundary lubrication tests using dodecanethiol-modified PdNPs as lubricant additives.
  • Nanostructural examination and chemical analysis of the formed tribofilm.
  • Friction and wear measurements with varying PdNP concentrations (0.5-1.0 wt %).

Main Results:

  • An unexpectedly thick tribofilm (2-3 μm) was formed by PdNPs.
  • Friction and wear were reduced by up to 40% and 97%, respectively.
  • The tribofilm was dominated by Palladium/Sulfur (Pd/S) compounds, unlike metal oxide-rich films.

Conclusions:

  • Dodecanethiol-modified PdNPs form ultrathick, Pd/S-dominated tribofilms, enhancing lubrication.
  • The PdNP core is crucial for friction and wear reduction, while the thiolate ligand aids wear protection.
  • This novel ultrathick tribofilm composition leads to superior lubricating behavior.