Mariño, FátimaLiñeira del Río, José ManuelGonçalves, David E.P.Seabra, Jorge H.O.López Iglesias, EnriquetaFernández Pérez, Josefa2023-11-142023-11-142023-06-22Wear 530–531 (2023) 2050250043-1648http://hdl.handle.net/10347/31278This work reports tribological properties of PAO6 containing SiO2 nanoparticles modified with stearic-acid (SiO2-SA) as additives at concentrations (0.05, 0.10, 0.20, 0.30) wt% and the same concentration of SA as a dispersant. Tribological experiments were performed at 120 °C in pure sliding and rolling-sliding conditions (5% slide-to-roll ratio). All nanolubricants have better anti-friction capabilities than PAO6. The optimum concentration for friction reduction was 0.30 wt% for both tribological conditions. The best anti-wear results for the specimens tested in pure sliding conditions were achieved with PAO6 + 0.20 wt% SiO2-SA with reductions of 55%, 86% and 92%, in wear track width, wear track depth and wear area, respectively. Tribological mechanisms of the nanoparticles have been analyzed through roughness measurements, concluding that polishing, tribofilm and adsorption of the additives occureng© 2023 The Authors. Published by Elsevier B.V. This article is available under the Creative Commons CC-BY-NC-ND license and permits non-commercial use of the work as published, without adaptation or alteration provided the work is fully attributedAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Low-viscosity oilNanoadditivesAnti-wear additivesSurface modification of NPsElectric vehiclesAutomatic transmission fluidsjournal article10.1016/j.wear.2023.205025open access