Effect of Surface Cleaning on Performance of Organic Friction Modifiers

Fry, Benjamin; Moody, Gareth; Spikes, H. A.; Wong, Janet S.S.

doi:10.1080/10402004.2019.1687797

Cited by 8 publications

(5 citation statements)

References 41 publications

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“…. ) adsorbed layers govern the friction by forming an adsorbed layer with critical thickness necessary to provide low friction [31]. Our results also suggest a benefical effect of adsorbed film of fatty acid molecules on the friction performances of dodecane.…”

Section: Influence Of the Presence Of Vo As Bio-additivesupporting

confidence: 53%

Moringa and Graphite as Additives to Conventional Petroleum-Based Lubricants

Nomède-Martyr¹,

Bilas²,

Bercion³

et al. 2021

Lubricants

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Many researches are focused on the tribological performances of pure vegetable oil in order to replace the conventional mineral engine oils. This work investigates the influence of local moringa oil (noted VO) on the performances of lubricants formed from a blend of dodecane and graphite particles at ambient temperature. In a first part, a reduction of about 50% of friction properties of dodecane is observed when adding small amounts of moringa oil (VO), which is intended to be used as a bio-base performance additive in lubricant formulations. The friction properties of their blends with graphite, generally employed as solid lubricant additive, showed an adsorption effect of fatty acid molecules. The more promising results were obtained for the blend containing 2 w% of VO. Physicochemical characterizations of the tribofilms evidence the good antiwear properties of the lubricant.

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Section: Influence Of the Presence Of Vo As Bio-additivesupporting

confidence: 53%

Moringa and Graphite as Additives to Conventional Petroleum-Based Lubricants

Nomède-Martyr¹,

Bilas²,

Bercion³

et al. 2021

Lubricants

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“…They were then rinsed with toluene, followed by cleaning with oxygen plasma for 1 minute to remove any surface residue. [29] Friction tests were carried out on a high frequency reciprocating rig (HFRR) from PCS instruments. The contact was fully flooded with 2 ml of lubricant used within the holder.…”

Section: Methodsmentioning

confidence: 99%

Interactions between organic friction modifier additives

Fry

Chui

Moody

et al. 2020

Tribology International

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The interactions of different additives in engine oils can create synergistic or antagonistic effects. This paper studies how mixing different organic friction modifier additives affects friction reducing properties of lubricants in the boundary lubrication regime. Amines of different degree of saturation were mixed with either glycerol monooleate (GMO) or oleic acid in hexadecane. The model lubricants thus formed were characterised with Fourier-transform infrared spectroscopy. Friction tests in reciprocating motion using ball-on-disc steel-steel contacts were conducted to examine the tribological performance of these lubricants. Worn surfaces were examined using X-ray photoelectron spectroscopy. Oleic acid and oleylamine, a primary amine. Were found to form a partial ionic liquid, providing synergistic friction reduction. This positive interaction reduces with increasing degree of saturation of the amine. No synergistic effect was observed between GMO and oleylamine, suggesting that GMO does not hydrolyse into a carboxylic acid within a rubbing contact in the presence of amine.

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“…If the ester groups do undergo hydrolysis, we hypothesize that GMO will give lower friction than OG. This is because an alcohol headgroup in fatty alcohols has weaker interaction with steel surface than the carboxylic acid group in oleic acid and stearic acid. − Hence, molecules such as oleyl alcohol and octadecanol are known to be poorer OFMs for steel–steel contacts.…”

Section: Introductionmentioning

confidence: 99%

Position of Carbonyl Group Affects Tribological Performance of Ester Friction Modifiers

Song,

Campen,

Shiel

et al. 2024

ACS Appl. Mater. Interfaces

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The tribological properties of lubricants can be effectively improved by the introduction of amphiphilic molecules, whose performance is largely affected by their polar head groups. In this work, the tribological performance in steel−steel contacts of two isomers, glycerol monostearate (GMS) and stearyl glycerate (SG), a glyceride and a glycerate, were investigated as organic friction modifiers (OFM) in hexadecane. SG exhibits a much lower friction coefficient and wear than GMS despite their similar structures. The same applies when comparing the performance of oleyl glycerate (OG) and its isomer, glycerol monooleate (GMO). Surface chemical analysis shows that SG forms a polar, carbonbased, tribofilm of around tens of nanometers thick, while GMS does not. This tribofilm shows low friction and robustness under nanotribology test, which may contribute to its superior performance at the macro-scale. The reason for this tribofilm formation can be due to the stronger adsorption of SG on the steel surface than that of GMS. The tribofilm formation can be stress-activated since lower friction and higher tribofilm coverage can be obtained under high load. This work offers insights into the lubrication mechanism of a novel OFM and provides strategies for OFM design.

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Effect of Surface Cleaning on Performance of Organic Friction Modifiers

Cited by 8 publications

References 41 publications

Moringa and Graphite as Additives to Conventional Petroleum-Based Lubricants

Moringa and Graphite as Additives to Conventional Petroleum-Based Lubricants

Interactions between organic friction modifier additives

Position of Carbonyl Group Affects Tribological Performance of Ester Friction Modifiers

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