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Unctuous ZrO2 nanoparticles with improved functional attributes as lubricant additives.

Jorge Espina Casado1, Alfonso Fernández González1, Ángel José Del Reguero Huerga2

  • 1Faculty of Chemistry, Department of Physical and Analytical Chemistry, University of Oviedo. Av. Julián Clavería, 8 33006-Oviedo, Spain.

Nanotechnology
|October 17, 2017
PubMed
Summary

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Chemically capping zirconium dioxide nanoparticles (ZrO2NPs) with long hydrocarbon chains enhances their stability in lubricants. This modification improves anti-wear properties and reduces friction in base oils.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Tribology

Background:

  • Metal-oxide nanoparticles show promise as lubricant additives due to anti-wear and friction-reducing properties.
  • Poor stability of these nanoparticles in organic media limits their practical application.

Purpose of the Study:

  • To develop a method for stabilizing zirconium dioxide nanoparticles (ZrO2NPs) in non-aqueous media.
  • To maintain the tribological performance of ZrO2NPs as lubricant additives after surface modification.

Main Methods:

  • Surface capping of ZrO2NPs with C-8, C-10, and C-16 saturated hydrocarbon chains.
  • Characterization using transmission electron microscopy, thermogravimetric analysis, FTIR, XPS, and solid-state NMR.
  • Dispersion stability assessed by static multiple light scattering and tribological performance evaluated through friction and wear tests.

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Main Results:

  • Stable dispersions of long-chain capped ZrO2NPs in non-aqueous media were successfully obtained.
  • The surface modification did not disrupt the inherent anti-wear and friction-reducing capabilities of the nanoparticles.
  • Tribological tests showed reduced friction coefficients and enhanced anti-wear properties in base lubricating oils containing the modified ZrO2NPs.

Conclusions:

  • Chemical capping provides an effective strategy to overcome the poor dispersion stability of metal-oxide nanoparticles in lubricants.
  • Modified ZrO2NPs offer a viable solution for improving lubricant performance, particularly in demanding applications requiring wear resistance and friction reduction.