RT Journal Article
T1 Tribological synergies among chemical-modified graphene oxide nanomaterials and a phosphonium ionic liquid as additives of a biolubricant
A1 Liñeira del Río, José Manuel
A1 López Iglesias, Enriqueta
A1 García, Fátima
A1 Fernández Pérez, Josefa
K1 Functionalization
K1 Lubricant
K1 Nanomaterials
K1 Synergy
K1 Tribological mechanisms
K1 Tribology
AB In the present work, antifriction and antiwear synergies of two functionalized graphene oxides (reduced graphene oxide, rGO, and reduced graphene oxide modified with octadecylamine, rGO@ODA) with a phosphonium ionic liquid (IL) as additives of a biodegradable ester base oil, BIOE, were investigated. For this aim, four BIOE nanodispersions were formulated: two nanodispersions without IL and two others with IL (hybrid nanolubricants), being the nanodispersions: BIOE + 0.05 wt% rGO, BIOE + 0.05 wt% rGO@ODA, BIOE + 1 wt% IL + 0.05 wt% rGO and BIOE + 1 wt% IL + 0.05 wt% rGO@ODA, and all of them showing good temporal stability (at least 3 weeks), especially those containing the ionic liquid. Tribological tests, under pure sliding conditions, were made with the aforementioned nanolubricants and with neat BIOE under a 20 N working load. All hybrid and non-hybrid nanolubricants resulted in lower friction coefficients compared to BIOE oil, with the largest friction reduction of 34% achieved by the 1 wt% IL + 0.05 wt% rGO nanolubricant. Discs lubricated with the prepared nanolubricants showed less wear than discs lubricated with BIOE, achieving the highest reduction (34%) in wear track width also for the 1 wt% IL + 0.05 wt% rGO nanolubricant. In addition, through confocal Raman microscopy, as well as roughness analysis of tested discs, it can be concluded that surface repairing, synergistic effect and tribofilm formation mechanisms occur.
PB Elsevier
SN 0167-7322
YR 2021
FD 2021-07-29
LK http://hdl.handle.net/10347/32152
UL http://hdl.handle.net/10347/32152
LA eng
NO Journal of Molecular Liquids 336 (2021) 116885
NO Authors thank Verkol Lubricantes for providing us with BIOE base oil and acknowledge the assistance of the RIAIDT-USC analytical abilities. This research was supported by Xunta de Galicia (ED431C 2020/10) and by MINECO and the ERDF programme through ENE2017-86425-C2-2-R project. FG acknowledges the Juan de la Cierva Incorporación 2017 program, the Xunta de Galicia (2016-2019, ED431G/09, Centro singular de investigación de Galicia), and Fondo Europeo de Desarrollo Regional (FEDER) for financial support
DS Minerva
RD 28 abr 2026