Abstract

FAHAD, Mustafa Raad  and  ABDULMAJEED, Basma Abbas. Surface Modification of TiO₂-Al₂O₃ Nanoparticles for the Enhancement of the Rheological Properties of Lubricating Oil. J. appl. res. technol [online]. 2022, vol.20, n.1, pp.37-47.  Epub May 30, 2022. ISSN 2448-6736.  https://doi.org/10.22201/icat.24486736e.2022.20.1.1556.

Nanoparticles can enhance various properties of lubricants. The surface modification was conducted for inorganic nanoparticles (NPs) TiO₂-Al₂O₃ with oleic acid (OA). The OA renders the TiO₂- Al₂O₃ surface hydrophobic. The OA-treated NPs show very stable dispersion in lubricating oil even after more than one month, compared with the unmodified NPs. The surface modification of NPs was characterized by Fourier transform infrared spectroscopy (FTIR). treated TiO2-Al₂O₃ are added to raw Iraqi base oil SN150 of low viscosity as a hybrid Nanofluid to study the rheological properties such as kinematic viscosity, viscosity index, and the stability of nano-fluid. Four different concentrations were prepared with a range of 0.2% to 1% by weight. Pour point and flashpoint was also identified. The treated TiO₂-Al₂O₃ lubricating oil indicates a significant improvement in the viscosity index by 5.3-9.1 %, while the flashpoint increased by 11-27 °C comparing with base oil.

Keywords : nano-lubricating oil; TiO₂-Al₂O₃ nanoparticles; surface modification; rheology.

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