RT Journal Article
T1 Tribological enhancement of potential electric vehicle lubricants using coated TiO2 nanoparticles as additives
A1 Liñeira del Río, José Manuel
A1 Mariño Fernández, Fátima
A1 López Iglesias, Enriqueta
A1 Gonçalves, David E. P.
A1 Seabra, Jorge H. O.
A1 Fernández Pérez, Josefa
K1 Low-viscosity lubricants
K1 Transmission fluids
K1 Nanoparticles coating
K1 Friction
K1 Wear
AB This work presents the antifriction and antiwear properties of TiO2 nanoparticles coated with oleic acid, TiO2-OA, as additives of a low viscosity polyalphaolefin base oil, PAO8. To find the optimal concentration of nanoadditives that minimize friction and wear, four PAO8 based nanodispersions were formulated: PAO8 + 0.10 wt% TiO2-OA, PAO8 + 0.25 wt% TiO2-OA, PAO8 + 0.35 wt% TiO2-OA and PAO8 + 0.50 wt% TiO2-OA. Tribological experiments were performed under pure sliding and rolling-sliding conditions at 120 °C, with the four formulated nanolubricants and with PAO8 base oil. All the nanolubricants showed lower friction coefficients than that obtained with the PAO8 base oil, reaching maximum reductions for the 0.35 wt% TiO2-OA nanolubricant, for both types of test conditions. The tribological specimens tested under pure sliding conditions with the nanolubricants showed fewer wear than those tested with PAO8, finding the highest wear decreases also with the PAO8 + 0.35 wt% TiO2-OA nanolubricant, being 26 %, 65 % and 73 %, in wear track width, depth and area, in that order. Through Raman microscopy and roughness study of the worn samples, it can be inferred that tribofilm, mending and polishing mechanisms occur. Moreover, the thermal conductivity of the optimal nanolubricant (0.35 wt%) was measured at 20, 30, 40 and 50 °C
PB Elsevier
YR 2022
FD 2022
LK http://hdl.handle.net/10347/29905
UL http://hdl.handle.net/10347/29905
LA eng
NO Journal of Molecular Liquids 371 (2023) 121097
NO This research is supported by Xunta de Galicia (ED431C 2020/10), by MCIN/AEI/10.13039/501100011033 through the PID2020-112846RB-C22 project and by LAETA, Portugal under project UID/50022/2020. JMLDR is grateful for financial support through the Margarita Salas programme, funded by MCIN/AEI/10.13039/501100011033 and “NextGenerationEU/PRTR”. FM acknowlegdes a IACOBUS grant to the European Grouping for Territorial Cooperation Galicia-Norte de Portugal (GNP-EGTC). Furthermore, authors also thank Repsol Lubricants for supplying us the PAO8 base oil and recognize the support of the RIAIDT-USC analytical skills
DS Minerva
RD 25 abr 2026