Tribological Behavior of Nanolubricants Based on Coated Magnetic Nanoparticles and Trimethylolpropane Trioleate Base Oil

Abstract

The main task of this work is to study the tribological performance of nanolubricants formed by trimethylolpropane trioleate (TMPTO) base oil with magnetic nanoparticles coated with oleic acid: Fe3O4 of two sizes 6.3 nm and 10 nm, and Nd alloy compound of 19 nm. Coated nanoparticles (NPs) were synthesized via chemical co-precipitation or thermal decomposition by adsorption with oleic acid in the same step. Three nanodispersions of TMPTO of 0.015 wt% of each NP were prepared, which were stable for at least 11 months. Two different types of tribological tests were carried out: pure sliding conditions and rolling conditions (5% slide to roll ratio). With the aim of analyzing the wear by means of the wear scar diameter (WSD), the wear track depth and the volume of the wear track produced after the first type of the tribological tests, a 3D optical profiler was used. The best tribological performance was found for the Nd alloy compound nanodispersion, with reductions of 29% and 67% in friction and WSD, respectively, in comparison with TMPTO. On the other hand, rolling conditions tests were utilized to study friction and film thickness of nanolubricants, determining that Fe3O4 (6.3 nm) nanolubricant reduces friction in comparison to TMPTO.

Tribological enhancement of potential electric vehicle lubricants using coated TiO2 nanoparticles as additives

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Nano-Particles Additives as a Promising Trend in Tribology: A Review on their Fundamentals and Mechanisms on Friction and Wear Reduction

“…Although many positive presentations on tribological improvement in lubricants with different nanoparticles, however, the issue of adequate selection of nanoparticles still occur 15,38) . More so, several works have indicated of possibility of single nanoparticle additive saving more than one purpose as in AW, FM, and EP 63,64) . According to 17,33) , pointed some fundamental criterial of NP that makes them advantageous in tribology like; (a) Low reactivity with other included additives; (b), More durability, (c), Insolubility in non-polar base oil, (d).…”

Tribological properties of trimethylolpropane oleate synthesized through esterification reaction with nano-MoS2 catalysts of different shapes

“…Trimethylolpropane oleate (TMPTO) is a chemically synthesized lubricant with the advantages of high viscosity index, good flammability resistance and ready biodegradability (Guimarey et al , 2021; Qiao et al , 2017), which has great potential for application in the field of lubricants (Nath et al , 2018; Liñeira del Río et al , 2020). TMPTO is synthesized by direct esterification or transesterification.…”