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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Organic-Modified Silver Nanoparticles as Lubricant Additives.

Chanaka Kumara1, Huimin Luo, Donovan N Leonard

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

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|October 3, 2017
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Summary

Silver nanoparticles (NPs) functionalized with thiolated ligands effectively reduce friction and wear in lubricants. These advanced lubricant additives form protective silver-rich tribofilms, enhancing performance in boundary lubrication conditions.

Keywords:
additiveantiwearboundary lubricationfriction reductionlubricantsilver nanoparticlestribofilm

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Area of Science:

  • Materials Science
  • Tribology
  • Nanotechnology

Background:

  • Advanced lubrication is critical for enhancing mobility, durability, and efficiency in various applications.
  • Developing novel lubricant additives is essential for improving tribological performance under demanding conditions.

Purpose of the Study:

  • To synthesize and characterize oil-suspendable silver nanoparticles (NPs) as potential lubricant additives.
  • To evaluate the friction reduction and wear protection capabilities of modified silver NPs in a poly-alpha-olefin (PAO) base oil.

Main Methods:

  • Silver nanoparticles (Ag NPs) were modified with two thiolated ligands: 4-(tert-butyl)benzylthiol (TBBT) and dodecanethiol (C12).
  • Ag NPs were synthesized in two size ranges (1-3 nm and 3-6 nm) and suspended in PAO base oil.
  • Friction and wear performance were evaluated using Stribeck tests under boundary lubrication conditions.

Main Results:

  • Modified Ag NPs were successfully suspended in PAO base oil at concentrations up to 0.50 wt %.
  • Friction was reduced by up to 35% and wear by up to 85% with the addition of Ag NPs.
  • TBBT-modified NPs showed lower friction, while larger NPs (3-6 nm) provided better wear protection.

Conclusions:

  • The molecular structure of the organic ligand influences friction, while NP size impacts wear protection.
  • Wear protection is attributed to the formation of a 50-100 nm thick silver-rich tribofilm on worn surfaces.
  • These silver nanoparticles represent promising candidates for advanced lubricant additive applications.