4 years ago

Unctuous ZrO2 Nanoparticles with Improved Functional Attributes as Lubricant Additives.

Humberto Rodríguez-Solla, Jorge Espina-Casado, Marta Elena Díaz-García, Ángel José Del Reguero-Huerga, Rosana Badía Laíño, Alfonso Fernández-González
One of the main drawbacks in the application of metal oxide nanoparticles as lubricant additives is their poor stability in organic media, despite the good anti-wear, friction-reducing and high load capacity properties described for these materials. In this work, we present a novel procedure to chemically cap the surface of ZrO2 nanoparticles (ZrO2NPs) with long hydrocarbon chains in order to obtain stable dispersions of ZrO2NPs in non-aqueous media without disrupting their attributes as lubricant additives. C-8, C-10 and C-16 saturated flexible chains have been attached to the ZrO2NPs surface and their physical and chemical characterization was performed by Transmission Electron Microscopy (TEM), Thermo Gravimetric Analysis (TGA), Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR), X-Ray Photoelectron Spectroscopy (XPS) and Solid-State Nuclear Magnetic Resonance (SS-NMR). The dispersion stability of the modified ZrO2NPs in non-aqueous media was studied using Static Multiple Light Scattering (MLS). Tribological tests demonstrated that dispersions of the long-chain capped ZrO2NPs in base lubricating oils exhibited low friction coefficients and improved anti-wear properties of base oil when compared with the raw lubricating oil.

Publisher URL: http://doi.org/10.1088/1361-6528/aa93ca

DOI: 10.1088/1361-6528/aa93ca

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