Thermal Behaviour of Synovene and Oleamide in Oil Adsorbed on Steel

Casford, Michael T. L.; Puhan, Debashis; Davies, Paul B.; Bracchi, Gareth L.; Smith, Tony D.

doi:10.1007/s11249-020-01293-x

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…Therefore, the increase in friction at 140°C cannot be due to loss of molecules from the surface. Recently, sum frequency generation spectroscopy studies have shown oleamide to exhibit maximum ordered adsorption at ~70°C 44 which may be the reason for improvement in frictional performance at the intermediate temperature.…”

Section: Resultsmentioning

confidence: 99%

Tribological performance of polymeric friction modifiers under sliding rolling contact condition

Cyriac,

Tee,

Chow

2023

Lubrication Science

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The tribological performance of two polymeric friction modifiers, one based on an ester‐based compound and another based on an ethoxylated fatty ester and an organic friction modifier, oleamide, was studied at 50, 90 and 140°C using a Mini Traction Machine equipped with optical interferometry and electrical contact resistance. The ability to form surface film is found to vary among the friction modifiers and with temperature and rubbing duration. Despite a thinner film being formed, polymeric friction modifier (PFMs) exhibited lower friction and wear than oleamide at all the studied temperatures. Further, the PFMs reduced boundary friction more effectively at higher temperature. In accordance with lower boundary friction, a smoother surface topography characterized by low wear was exhibited by PFM lubricated surfaces at higher temperatures. Scanning electron microscopy‐energy dispersive x‐ray analysis and time‐of‐flight secondary ion mass spectrometry provided insights on the tribofilm formation. The improvement in the tribological performance of PFMs is attributed to temperature‐induced conformation transition of adsorbed polymer chains on the surface. The results are corroborated by data obtained from dynamic light scattering and gel permeation chromatography.

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Section: Resultsmentioning

confidence: 99%

Tribological performance of polymeric friction modifiers under sliding rolling contact condition

Cyriac,

Tee,

Chow

2023

Lubrication Science

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“…An in-depth study was conducted on this basis, as shown in Fig. 7(c) [83]. Co-operative behavior was observed between different friction modifier molecules.…”

Section: Friction Interface Behaviors In Complex Oil-based Lubricatinmentioning

confidence: 99%

Applications of sum-frequency generation vibrational spectroscopy in friction interface

Liu

Zhang

et al. 2021

Friction

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Sum-frequency generation (SFG) vibrational spectroscopy is a second-order nonlinear optical spectroscopy technique. Owing to its interfacial selectivity, SFG vibrational spectroscopy can provide interfacial molecular information, such as molecular orientations and order, which can be obtained directly, or molecular density, which can be acquired indirectly. Interfacial molecular behaviors are considered the basic factors for determining the tribological properties of surfaces. Therefore, owing to its ability to detect the molecular behavior in buried interfaces in situ and in real time, SFG vibrational spectroscopy has become one of the most appealing technologies for characterizing mechanisms at friction interfaces. This paper briefly introduces the development of SFG vibrational spectroscopy and the essential theoretical background, focusing on its application in friction and lubrication interfaces, including film-based, complex oil-based, and water-based lubricating systems. Real-time detection using SFG promotes the nondestructive investigation of molecular structures of friction interfaces in situ with submonolayer interface sensitivity, enabling the investigation of friction mechanisms. This review provides guidance on using SFG to conduct friction analysis, thereby widening the applicability of SFG vibrational spectroscopy.

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“…In general, the friction modifications used in engine oil are metal friction modifications (such as didithiophosphate zinc (ZDDP), organic molybdenum [9,10], etc.) and non-metallic friction modifications (such as oleamide [11], glycerol monooleate [3,12,13], etc.). Metal friction improvement agents are mostly metal or metal compounds containing sulfur and phosphorus.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Tribological Behaviors of Sulfur- and Phosphorus-Free Organic Friction Modifier of Amide–Ester Type

Xu,

Yang,

Yang

et al. 2024

Lubricants

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With the increasingly demanding engine conditions and the implementation of “double carbon” policies, the demand for high-quality lubricants that are cost-effective and environmentally friendly is increasing. Additives, especially high-performance friction modifiers, play an important role in boosting lubricant efficiency and fuel economy, so their developments are at the forefront of lubrication technologies. In this study, 1,3-dioleoamide-2-propyloleate (DOAPO), which incorporates polar amide, ester, and nonpolar alkyl chains, was synthesized from 1,3-diamino-2-propanol to give an eco-friendly organic friction modifier. Nuclear magnetic resonance (NMR), high-resolution mass spectrometry (HR-MS), Fourier-transform infrared spectroscopy (FT-IR), and thermogravimetric analysis (TGA) were used to characterize the structure and thermal stability of DOAPO. Meanwhile, the storage stability and tribological behaviors of DOAPO in synthetic base oil were studied and compared with a commercial oleamide. The results show that DOAPO has better thermal stability and better storage stability in synthetic base oil. Additionally, 0.5 wt.% of DOAPO could shorten the running-in period and reduce the average friction coefficient (ave. COF) and wear scar diameter (ave. WSD) by 8.2% and 16.2%, respectively. The worn surface analysis and theoretical calculation results show that the ester bond in DOAPO breaks preferentially during friction, which can reduce the interfacial shear force and easily react with metal surfaces to form iron oxide films, thus demonstrating a better friction-reducing and anti-wear performance.

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Thermal Behaviour of Synovene and Oleamide in Oil Adsorbed on Steel

Cited by 3 publications

References 9 publications

Tribological performance of polymeric friction modifiers under sliding rolling contact condition

Tribological performance of polymeric friction modifiers under sliding rolling contact condition

Applications of sum-frequency generation vibrational spectroscopy in friction interface

Preparation and Tribological Behaviors of Sulfur- and Phosphorus-Free Organic Friction Modifier of Amide–Ester Type

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