RT Journal Article
T1 Lubricant properties of a polyalphaolefin oil additivated with zirconia and ceria-zirconia nanoparticles
A1 García Guimarey, María Jesús
A1 Castro Currás, Arturo
A1 Liñeira del Río, José Manuel
A1 Pérez Comuñas, María José
K1 Zirconia
K1 Ceria-zirconia
K1 Polyalphaolefin
K1 Viscosity
K1 Friction coefficient
K1 Wear
AB In this work zirconia (ZrO2) and hybrid ceria-zirconia (CeO2-ZrO2) nanoparticles are used for the first time as lubricant additives of the PAO8 base oil (low-viscosity polyalphaolefin oil) at concentrations from 0.05 wt% to 0.20 wt%. Thermophysical properties of the eight formulated nanolubricants were experimentally determined observing that the presence of these nanoadiditves not significantly alter the volumetric behaviour of neat PAO8. On the contrary, the presence of CeO2-ZrO2 in formulation increases the viscosity of the base oil by up to 13 %. Tribological tests were performed under pure sliding conditions at 393.15 K at a load of 20 N using a ball-on-three-pin rotational tribometer. Moreover, the wear was quantified with a 3D optical profilometer. Nanolubricants with zirconia nanoparticles exhibited superior characteristics in terms of stability, antifriction and anti-wear properties than those formulated with hybrid ceria-zirconia nanoparticles. The best tribological behaviour was obtained with 0.05 wt% ZrO2, thus reductions of 13 % in friction coefficient and of 73 % in the worn area were obtained. The results obtained have been compared with those previously reported for the same base oil (PAO8) and other types of nanoadditives. Finally, surface roughness analysis, Raman microscopy and SEM-EDX were used to analyse the wear mechanism produced by zirconia and hybrid ceria-zirconia nanoparticles.
PB Elsevier
YR 2025
FD 2025-04-02
LK https://hdl.handle.net/10347/42322
UL https://hdl.handle.net/10347/42322
LA eng
NO Journal of Molecular Liquids Volume 428, 15 June 2025, 127502
NO This research is supported by projects PID2020-112846RB-C22 and ED431C 2024/06 funded by MCIN/AEI/10.13039/501100011033 and through the Xunta de Galicia, respectively. The authors would like to thank the use of RIAIDT-USC analytical facilities. Dr M.J.G.G. and Dr. J.M.L.dR are grateful for financial support through the grant reference ED481D 2023/016 from Xunta de Galicia (Spain) and the Margarita Salas programme, funded by MCIN/AEI/10.13039/501100011033 and “NextGenerationEU/PRTR”, respectively.
DS Minerva
RD 30 abr 2026