Effect of the addition of coated SiO2 nanoparticles on the tribological behavior of a low-viscosity polyalphaolefin base oil

Mariño, Fátima; Río, José M. Liñeira del; Gonçalves, David; Seabra, Jorge; López, Enriqueta R.; Fernández, Josefa

doi:10.1016/j.wear.2023.205025

Cited by 2 publications

(5 citation statements)

References 37 publications

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“…Thus, in Figure 10a blue areas of Raman mapping are associated with iron oxides, green areas with the base oil, and red areas with the burned oil. In Figure 10b, it can be seen from the presence of blue areas associated with the SiO 2 -SA nanoparticles that the spectrum of this area coincides with the SiO 2 -SA Raman spectrum [32]. Considering these Raman analyses, a protective tribofilm from the SiO 2 -SA in the tribo-contact can be a possible tribological mechanism that participates in the decrease in friction and wear.…”

Section: Samplementioning

confidence: 72%

“…Thus, as shown in Figure 1b, average sizes of around 11 nm were reached and were similar to the average size provided by the manufacturer (8 nm). Furthermore, in a previous work [32], infrared spectra of SA, uncoated SiO 2 NPs, and SiO 2 -SA NPs were also reported; it was observed, among other information, that the characteristic peaks of SA also appear in the spectrum of SiO 2 -SA, evidencing a proper SA coating with the SiO 2 nanoparticles.…”

Section: Base Oil and Nanoparticlesmentioning

confidence: 77%

Section: Formulation Of Nanolubricantsmentioning

confidence: 99%

“…On the other hand, to prepare the SiO2-SA nano-dispersions, commercial SiO2 nanopowders were coated with SA following the chemical reaction given in Figure 2a and then the dispersion method displayed in Figure 2b, to finally obtain a 4 wt% SiO2-SA nanolubricant. More details about a similar functionalization process can be seen in our previous article [32]. Therefore, dilutions of the achieved 4 wt% SiO2-SA nanolubricant were performed by adding G-III base oil, until reaching the desired (0.15, 0.30, 0.45, and 0.60 wt%) SiO2-SA nanolubricants.…”

Section: Formulation Of Nanolubricantsmentioning

confidence: 99%

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Tribological Performance of a Paraffinic Base Oil Additive with Coated and Uncoated SiO2 Nanoparticles

Liñeira del Río,

Guimarey,

Somoza

et al. 2024

Materials

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Electric vehicles (EVs) have emerged as a technology that can replace internal combustion vehicles and reduce greenhouse gas emissions. Therefore, it is necessary to develop novel low-viscosity lubricants that can serve as potential transmission fluids for electric vehicles. Thus, this work analyzes the influence of both SiO2 and SiO2-SA (coated with stearic acid) nanomaterials on the tribological behavior of a paraffinic base oil with an ISO VG viscosity grade of 32 and a 133 viscosity index. A traditional two-step process through ultrasonic agitation was utilized to formulate eight nanolubricants of paraffinic oil + SiO2 and paraffinic base oil + SiO2-SA with nanopowder mass concentrations ranging from 0.15 wt% to 0.60 wt%. Visual control was utilized to investigate the stability of the nanolubricants. An experimental study of different properties (viscosity, viscosity index, density, friction coefficient, and wear) was performed. Friction analyses were carried out in pure sliding contacts at 393.15 K, and a 3D optical profilometer was used to quantify the wear. The friction results showed that, for the SiO2-SA nanolubricants, the friction coefficients were much lower than those obtained with the neat paraffinic base oil. The optimal nanoparticle mass concentration was 0.60 wt% SiO2-SA, with which the friction coefficient decreased by around 43%. Regarding wear, the greatest decreases in width, depth, and area were also found with the addition of 0.60 wt% SiO2-SA; thus, reductions of 21, 22, and 54% were obtained, respectively, compared with the neat paraffinic base oil.

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Section: Samplementioning

confidence: 72%

Section: Base Oil and Nanoparticlesmentioning

confidence: 77%

Section: Formulation Of Nanolubricantsmentioning

confidence: 99%

Section: Formulation Of Nanolubricantsmentioning

confidence: 99%

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Tribological Performance of a Paraffinic Base Oil Additive with Coated and Uncoated SiO2 Nanoparticles

Liñeira del Río,

Guimarey,

Somoza

et al. 2024

Materials

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“…A sample of this base oil has a dynamic viscosity and density at 313.15 K of 14.25 mPa.s and 0.8033 g•cm −3 , respectively. PAO6 was earlier characterized by some techniques like infrared spectroscopy (FTIR) and Raman spectroscopy, where the typical peaks of alkyl C-C chains, as well as the bending and stretching of C-H, were observed [31].…”

Section: Base Oil and Additivesmentioning

confidence: 99%

Synergistic Effects of Functionalized WS2 and SiO2 Nanoparticles and a Phosphonium Ionic Liquid as Hybrid Additives of Low-Viscosity Lubricants

Liñeira del Río,

Fernandes,

Gonçalves

et al. 2024

Lubricants

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This research shows the antifriction and antiwear synergies between a phosphonium ionic liquid (IL) and f-WS2 and f-SiO2 nanoparticles (NPs) as additives of a base oil with low viscosity (PAO6). Mass concentrations of 0.1 wt% nanoadditives and 1% IL were selected to formulate the nanolubricants. Pure sliding and rolling–sliding friction tests were performed at 120 °C, finding great friction reductions in comparison with the PAO6 base oil, specifically for the double hybrid nanolubricant (PAO6 + 1 wt% IL + 0.1 wt% f-WS2 + 0.1 wt% f-SiO2). Regarding the wear produced, the greatest antiwear behavior was also achieved for the double hybrid nanolubricant (width reduction of 48% and worn area decrease of 84%). Furthermore, by means of Raman microscopy and roughness examination of the worn surfaces, it can be proposed that the lubrication mechanism of doubled hybrid nanolubricants could be supported by the adsorbed tribofilm (IL and f-WS2) as well as the mending effects (f-WS2 and f-SiO2).

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Effect of the addition of coated SiO2 nanoparticles on the tribological behavior of a low-viscosity polyalphaolefin base oil

Cited by 2 publications

References 37 publications

Tribological Performance of a Paraffinic Base Oil Additive with Coated and Uncoated SiO2 Nanoparticles

Tribological Performance of a Paraffinic Base Oil Additive with Coated and Uncoated SiO2 Nanoparticles

Synergistic Effects of Functionalized WS2 and SiO2 Nanoparticles and a Phosphonium Ionic Liquid as Hybrid Additives of Low-Viscosity Lubricants

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