RT Journal Article
T1 Improving the tribological performance of a biodegradable lubricant adding graphene nanoplatelets as additives
A1 Liñeira del Río, José Manuel
A1 García Guimarey, María Jesús
A1 Prado, José I.
A1 Lugo, Luis
A1 López Iglesias, Enriqueta
A1 Pérez Comuñas, María José
K1 Graphene nanoplatelets
K1 Biodegradable synthetic ester
K1 Tribological mechanisms
K1 Friction
K1 Wear
AB This research is based on the investigation of the tribological properties of a biodegradable polymeric ester lubricant (BIOE) additivated with two different pristine graphene nanoplatelets (GnPs), named as GnP7 and GnP40. These GnPs have lateral sizes of 7 and 40 μm, and thickness of 3 and 10 nm, respectively. Four different nanoadditive loadings: 0.015, 0.035, 0.055 and 0.075 wt% have been used. Stability of nanolubricants has been investigated using the visual control and the refractive index evolution during time, revealing a slightly better stability for the nanolubricants formulated with the largest lateral size graphene nanoplatelets (GnP40). The influence of the thickness and lateral size of these carbon-based nanoadditives on the antifriction and antiwear capabilities of BIOE is analysed. For this purpose, rotational friction tests were taken with the eight nanolubricants under a 20 N working load and 340 m sliding distance. All nanolubricants showed friction coefficients and worn area lower than those previously reported for the unadditivated BIOE. As regards friction, the ideal loading for both GnPs was 0.055 wt% GnP, being the best anti-friction behaviour obtained using GnP40 as additive (up to 26% reduction), whereas the 0.055 wt% GnP7/BIOE nanolubricant leads to the best anti-wear capability with wear reductions up to 56%. Finally, from Raman microscopy and roughness assessments on the worn surfaces, it can be determined that the good tribological performance of nanolubricants is owing to the protective film formation and surface repairing mechanism
PB Elsevier
YR 2022
FD 2022
LK http://hdl.handle.net/10347/27751
UL http://hdl.handle.net/10347/27751
LA eng
NO Journal of Molecular Liquids 345 (2022) 117797. https://doi.org/10.1016/j.molliq.2021.117797
NO This research was supported by the “Ministerio de Ciencia, Innovación y Universidades” (Spain) and the FEDER program through the ENE2017-86425-C2-1/2-R project and by Xunta de Galicia (ED431C 2020/10). Authors would like to thank Verkol Lubricantes and Avanzare Innovacion Tecnologica S.L. for providing the BIOE base oil and pristine graphene nanoplatelets, respectively. Authors would like also to thank the help of RIAIDT-USC analytical facilities. M.J.G.G. and J.I.P. are grateful for the support of the Xunta de Galicia for the postdoctoral (reference ED481B-2019-015) and predoctoral fellowship grants
DS Minerva
RD 22 abr 2026