ZnO nanoparticles coated with oleic acid as additives for a polyalphaolefin lubricant
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Título: | ZnO nanoparticles coated with oleic acid as additives for a polyalphaolefin lubricant |
Autor/a: | Mariño Fernández, Fátima López Iglesias, Enriqueta Arnosa Prieto, Ángela González Gómez, Manuel Antonio Piñeiro Redondo, Yolanda Rivas Rey, José Álvarez Lorenzo, Carmen Isabel Fernández Pérez, Josefa |
Centro/Departamento: | Universidade de Santiago de Compostela. Departamento de Física Aplicada Universidade de Santiago de Compostela. Departamento de Farmacoloxía, Farmacia e Tecnoloxía Farmacéutica |
Palabras chave: | Zinc oxide nanoparticles | Nanoparticle surface modification | Oleic acid coating | Nanolubricant | Tribological properties | Lubricant additives | |
Data: | 2022 |
Editor: | Elsevier |
Cita bibliográfica: | Journal of Molecular Liquids 348 (2022) 118401 |
Resumo: | In this work, ZnO nanoparticles (NPs) were successfully synthesized and coated with oleic acid (OA). The mean diameter of these NPs (ZnO-OA) was around 11.5 nm, their core was characterized by XRD and their coating by FTIR and Raman. Homogeneous dispersions at different concentrations (0.10, 0.25, 0.50, 0.75 and 1.00 wt%) of ZnO-OA in polyalphaolefin 40 (PAO40) oil were thermophysically and tribologically characterized. Both density and viscosity values increased with the concentration of NPs, reaching relative increments of 0.5% and 4.0%, respectively, for the 1 wt% nanodispersion. Tribological tests were performed at 353.15 K using an Anton Paar MCR 302 rheometer equipped with a tribological ball-on three-pins configuration testing module. Regarding the tribological behavior, the optimal concentration was 0.25 wt% of ZnO-OA (25% of reduction in the friction coefficient and 82% wear reduction in terms of cross sectional area, respect to those obtained with the neat base oil). The rolling mechanism owing to the spherical shape of the nanoadditives, transforming sliding friction into rolling friction, and the mending effect could explain the better tribological performance of nanolubricants with respect to that of neat PAO40. In addition, the presence of PAO40, ZnO-OA NPs and iron oxides was evidenced from confocal Raman microscopy on the worn surfaces obtained from tribological test with PAO40 + 0.25 wt% ZnO-OA dispersion |
Versión do editor: | https://doi.org/10.1016/j.molliq.2021.118401 |
URI: | http://hdl.handle.net/10347/27389 |
DOI: | 10.1016/j.molliq.2021.118401 |
ISSN: | 0167-7322 |
Dereitos: | © 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Attribution-NonCommercial-NoDerivatives 4.0 Internacional |
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