Effect of ZrO2 nanoparticles on thermophysical and rheological properties of three synthetic oils

Guimarey, María J.G.; Salgado, Miguel R.; Comuñas, Marı́a J. P.; López, Enriqueta R.; Amigo, Alfredo; Cabaleiro, David; Lugo, Luis; Fernández, Juan Manuel Vilar

doi:10.1016/j.molliq.2018.04.027

Cited by 26 publications

(23 citation statements)

References 54 publications

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“…This procedure was previously explained [43]. Figure 7 shows an amazing stability over time for all the nanodispersions, showing an important improvement of the stability in comparison with other nanodispersions previously studied [44,45]. Specifically, for TMPTO-based nanolubricants, the refractive index increases 0.44 and 0.08 for graphene oxide, GO and reduced graphene oxide, rGO nanoparticles after 50 h [45].…”

Section: Stability Of the Nanolubricantssupporting

confidence: 53%

“…For this aim a Mettler Toledo Refractometer was used to measure the refractive index of nanodispersions over time. This procedure was previously explained[43].Figure 7shows an amazing stability over time for all the nanodispersions, showing an important improvement of the stability in comparison with other nanodispersions previously studied[44,45]. Specifically, for Visual observation of the stability of the nanolubricants TMPTO + 0.015 wt% NP: (a) just after sonication of 240 min; (b) 11 months after sonication.…”

mentioning

confidence: 67%

“…Specifically, the maximum viscosity increase is only 2.8%, which was obtained for the Nd alloy at 278.15 K in comparison to the base oil. Viscosity increase is common when a base oil is additive with nanoparticles [44]. On the other hand, the viscosity, pressure-viscosity coefficient and film thickness of the lubricants decrease when temperature rises [48].…”

Section: Surface Analysis Of Worn Pinsmentioning

confidence: 99%

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

et al. 2020

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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.

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Section: Stability Of the Nanolubricantssupporting

confidence: 53%

mentioning

confidence: 67%

Section: Surface Analysis Of Worn Pinsmentioning

confidence: 99%

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

et al. 2020

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“…Adiabatic bulk modulus (KS) and thermal expansion coefficient (αp) can be obtained using the density and speed of sound. Low values of adiabatic bulk modulus imply good low-temperature fluidity [2,3]. The adiabatic bulk modulus can be used as a predictive parameter for the pressureviscosity coefficient [2].…”

Section: Introductionmentioning

confidence: 99%

“…Low values of adiabatic bulk modulus imply good low-temperature fluidity [2,3]. The adiabatic bulk modulus can be used as a predictive parameter for the pressureviscosity coefficient [2]. The coefficient of thermal expansion (αp) leads to useful information on the dependence of the volumetric properties with temperature and pressure.…”

Section: Introductionmentioning

confidence: 99%

Thermophysical Characterization of TFSI Based Ionic Liquid and Lithium Salt Mixtures

Fernández-Míguez

Vallet

Tasende-Rodríguez

et al. 2019

The 23rd International Electronic Conference on Synthetic Organic Chemistry

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The ionic liquids (ILs) doped with metal salts have become a real alternative as electrolytes for batteries, but the right choice of these compounds for reaching the adequate properties and performance is still a challenge, and strategies are therefore needed for achieving it. The thermophysical properties of IL 1-butyl-1-methylpyrrolidinium bis[(trifluoromethyl)sulfonyl]imide ([bmpyr] [TFSI]) and its mixture with bis-(trifluoromethane)-sulfonimide lithium salt (from 0.1 m to saturation level) were determined in this work. These properties are density (ρ), speed of sound (U), and corresponding derived magnitudes, such as the bulk modulus and the thermal coefficient, as well as electrical conductivity (σ) against temperature. Density shows a linear decreasing dependence with temperature and a clear increase with the addition of salt, whereas the thermal expansion coefficient increases with temperature and salt addition. Speed of sound decreases with both temperature and salt concentration, and the adiabatic compressibility calculated by means of the well-known Laplace equation increases, as expected, with temperature in all the studied cases, although a small variation with concentration was observed. Electrical conductivity increases with temperature following the Vogel-Fulcher-Tammann (VFT) equation and decreases with the addition of salt.

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A review on potentials and challenges of nanolubricants as promising lubricants for electric vehicles

Mustafa

Dassenoy

Sarno

et al. 2021

Lubrication Science

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The most remarkable difference between electric vehicles (EVs) and conventional ones is the fuel burning dependency of the internal combustion engine, while the emerging EVs operate on electric motors. These alternations create staggering shifts in both lubricants' market demand and performance specifications. Lubricants for electrical powertrain constitutes greases, transmission oils, and lubricants for auxiliary systems and do not rely on engine oils as internal combustion vehicles. The new standards will be more focused on lubricants' electrical properties such as breakage voltage and conductivity, coupled with tribological performance under high rpm, corrosion resistance and thermal management benchmarks. This paper thematically reviews the different studies performed with nanolubricants, and how they match EVs' operational requirements. Conclusions from this study can be considered as guidelines for the potential application of nanolubricants in EVs and possible future research that can be accomplished on the topic.

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Effect of ZrO2 nanoparticles on thermophysical and rheological properties of three synthetic oils

Cited by 26 publications

References 54 publications

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

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

Thermophysical Characterization of TFSI Based Ionic Liquid and Lithium Salt Mixtures

A review on potentials and challenges of nanolubricants as promising lubricants for electric vehicles

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