Surface-modified Pd and Au nanoparticles for anti-wear applications

J. C. Sánchez-López, M. D. Abad, L. Kolodziejczyk, E. Guerrero, A. Fernández

Research output: Indexed journal article Articlepeer-review

65 Citations (Scopus)


This work reports the employment of metallic nanoparticles (palladium and gold) with a mean particle size of 2.2 nm surface-protected with tetraalkylammonium and alkanethiolate chains, respectively, as lubricant additives. Dispersions of both types of nanoparticles (5 wt%) are prepared using tetrabutylammonium acetate (TBA) and paraffin as base oils, respectively. The tribological properties are then evaluated by a ball-on-disc tribometer at two different loads (7 and 15 N) with excellent results: friction (<0.1), wear rate (∼10-10 mm3/Nm). The excellent anti-wear response is explained by the formation of a metal-containing transfer film and their action as counterface spacers avoiding direct contact.

Original languageEnglish
Pages (from-to)720-726
Number of pages7
JournalTribology International
Issue number6
Publication statusPublished - Jun 2011
Externally publishedYes


  • Additive
  • Anti-wear
  • Load-capacity
  • Nanoparticles


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