Effect of temperature on the lubrication ability of two ammonium ionic liquids

Kreivaitis, Raimondas; Kupčinskas, Artūras; Žunda, Audrius; Ta, Thi-Na; Horng, Jeng Haur

doi:10.1016/j.wear.2021.204217

Cited by 11 publications

(15 citation statements)

References 35 publications

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“…The friction of R + IL at 100 °C was higher than that at 40 °C, consistent with a similar trend observed for [N 1888 ] [NTf 2 ] as a neat lubricant in the steel-to-steel contact. 36 The thickest tribofilm formed on the ball surface was found in the test of R100 formulated with the IL at 40 °C (Figure 5(a)). The thickness of tribofilm changed slightly with increasing test temperature.…”

Section: Effects Of Single Additives On the Tribological Behaviorsmentioning

confidence: 98%

“…Recent studies have conducted tribological tests on ILs under different temperatures and operating conditions, revealing the complexity of IL lubrication. 4,20,22,[33][34][35][36][37] Liu et al 33 reported that alkylimidazoliumbased ILs exhibit excellent lubricity both in air and vacuum conditions for steel-steel, steel-aluminum, and steel-copper contacts. With increasing temperature, the corrosion resistance of IL decreases, 34 and friction increases and fluctuates.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of tribological behavior of a circulation oil with ionic liquid and hybrid additives

Ta,

Horng

2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this study, the synergistic effects of methyltrioctylammonium bis(trifluoromethylsulfonyl)imide [N1888] [NTf2] ionic liquid (IL) with zinc dialkyldithiophosphate (ZDDP) and zinc oxide (ZnO) nanoparticles (NPs) as hybrid additives in a circulation oil for steel–steel contacts at different temperatures. The wear test results indicated that the additions of single additives (IL, ZDDP, and ZnO NPs) could enhance the tribological performance of the circulation oil. Among these additives, the IL exhibited the most effective at the same weight concentration blended into the tested oil. The mixture of IL and ZDDP showed superior friction-reducing and wear-reducing properties compared to the IL + ZnO formulation. The hybrid additive formulation consisting of 0.5 wt% IL, 0.25 wt% ZDDP, and 0.25 wt% ZnO NPs exhibited excellent tribological properties at higher temperatures in the boundary lubrication regime. Analysis using scanning electron microscopy/energy dispersive X-ray reveals that all single additives contribute to the formation of a tribofilm wear mechanism. However, the role of ZnO NPs in the hybrid additive conditions was changed from the most likely tribosintering effect to the most likely nano bearing effect at 100 °C. The interactions among IL, ZDDP, and NPs examined in this study can provide fundamental insights for the development of future lubricants.

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Section: Effects Of Single Additives On the Tribological Behaviorsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Evaluation of tribological behavior of a circulation oil with ionic liquid and hybrid additives

Ta,

Horng

2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…where H and H max are the displacement and maximum displacement of the valve opening. The motion of valves for gas suction and discharge can be calculated by Equation (21), considering the gas, spring, and the mechanical unload forces with the mass of the valve ignored. 38…”

Section: Mathematical Modelling Of the Thermodynamic Process Consider...mentioning

confidence: 99%

“…Ionic liquids are formed by an organic cation and an organic or inorganic anion presenting as molten salts, many of which are liquid at room temperature. 16 They possess several excellent properties including negligibly low vapor pressures, 17 electrochemical stability, chemical stability, 18 thermal stability, high ionic conductivity, 19 low flammability, 20 and excellent lubricity, 21 which promotes the application of them in various energy fields such as fuel cells, 22 solar cells, 23 batteries, 24 and energy storage. 25 As the most promising compression solution, in the ionic liquid compressor, the solid piston of the reciprocating compressor is substituted by the ionic liquid piston and driven by the hydraulic system.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modelling and design of the ionic liquid compressor for the hydrogen refuelling station

Guo

Wang

Liu³

et al. 2022

Intl J of Energy Research

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Summary The ionic liquid compressor is regarded as the most promising compression technology for the hydrogen refuelling station due to the combined application of ionic liquid and the hydraulic driving system. However, the design, mathematical and experimental investigations of the ionic compressor are still absent from the open literature. This paper proposed a new structure design and the design methodology of the ionic liquid compressor. The mathematical modelling considering the valve dynamics was provided for simulating the thermodynamic process, which was verified by the experimental data. The results showed that the delayed closing of the discharge valve would take place due to a high or low stiffness of the valve. The increase in the stiffness alleviated the rebound issue of the suction valve. An increase in the stroke to diameter ratio could solve the rebound issue of the discharge valve. A low or high trajectory coefficient would cause an intense rebound during the closing procedure of the discharge valve. The designed results of the main parameters of the compressor based on the simulation were the suction valve stiffness of 100 N/m, the discharge valve stiffness of 500 N/m, the stroke to diameter ratio of 1.0, and the trajectory coefficient of 0.125 under the given design condition.

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“…Due to the existence of the ionic liquid, it can work as a liquid sealing and the lubricant between the solid piston and the compression chamber. The ionic liquid compressor is an effective method for compressing hydrogen because of the inherent advantages of the ionic liquid, for instance, the extremely low vapour pressure [39], the excellent lubricity feature [40], inert features in thermal [41] and chemical [42] reactions, and nonflammability [43]. It is worth noting that the ionic liquid compressor is applied for the onsite compression and storage of hydrogen in the hydrogen refuelling stations, which is not designed for long-distance transporting.…”

Section: Introductionmentioning

confidence: 99%

Effects of Liquid Density on the Gas-Liquid Interaction of the Ionic Liquid Compressor for Hydrogen Storage

Guo

Wang

Geng³

et al. 2023

Energies

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As a new and promising compression technology for hydrogen gas, the ionic liquid compressor inherits the advantages of the ionic liquid and the hydraulic system. The liquid density is one of the key parameters influencing the fluid flow field, the sloshing of the bulk liquid, and the movement of droplets generated during the compressor operation. An appropriate selection of the liquid density is important for the compressor design, which would improve the thermodynamic performance of the compressor. However, the density of the ionic liquid varied significantly depending on the specific combination of the cation and anions. This paper proposed the methodology to select the optimal liquid density used in the ionic liquid compressor for hydrogen storage. The gas-liquid interaction in the compression chamber is analysed through numerical simulations under varied liquid density values. Results found that the increase in the liquid density promoted the detachment of the ionic liquid from the cylinder cover during the suction procedure and the contact of the bulk liquid on the compressor cover when the gas is compressed in the cylinder during the compression procedure. Both the droplet size and the dimension of the derived gas vortex decreased when the liquid density increased. The lowest mass transfer of hydrogen through the outlet was obtained at the density of 1150 kg/m3. The density of the ionic liquid from 1300 to 1450 kg/m3 is suggested to the hydrogen compressor, taking into account the transient two-phase flow characteristics, the mass transfer, and the total turbulent kinetic energy.

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Effect of temperature on the lubrication ability of two ammonium ionic liquids

Cited by 11 publications

References 35 publications

Evaluation of tribological behavior of a circulation oil with ionic liquid and hybrid additives

Evaluation of tribological behavior of a circulation oil with ionic liquid and hybrid additives

Mathematical modelling and design of the ionic liquid compressor for the hydrogen refuelling station

Effects of Liquid Density on the Gas-Liquid Interaction of the Ionic Liquid Compressor for Hydrogen Storage

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