RT Journal Article
T1 ZnO nanoparticles coated with oleic acid as additives for a polyalphaolefin lubricant
A1 Mariño Fernández, Fátima
A1 López Iglesias, Enriqueta
A1 Arnosa Prieto, Ángela
A1 González Gómez, Manuel Antonio
A1 Piñeiro Redondo, Yolanda
A1 Rivas Rey, José
A1 Álvarez Lorenzo, Carmen
A1 Fernández Pérez, Josefa
K1 Zinc oxide nanoparticles
K1 Nanoparticle surface modification
K1 Oleic acid coating
K1 Nanolubricant
K1 Tribological properties
K1 Lubricant additives
AB 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
PB Elsevier
SN 0167-7322
YR 2022
FD 2022
LK http://hdl.handle.net/10347/27389
UL http://hdl.handle.net/10347/27389
LA eng
NO Journal of Molecular Liquids 348 (2022) 118401
NO Funding for this work has been provided by the Ministry of Science, Innovation and Universities of Spain and the European Regional Development Fund (ERDF, FEDER in Spanish) through the ENE2017-86425-C2-2-R project, and by the Xunta de Galicia through ED431C 2020/10
DS Minerva
RD 23 abr 2026