Tribology of Green Lubricants

Mannekote, Jagadeesh K.; Menezes, Pradeep L.; Kailas, Satish V.; Sathwik, R. K. Chatra

doi:10.1007/978-1-4614-1945-7_14

Cited by 14 publications

(10 citation statements)

References 48 publications

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“…Although lubrication science is usually focused on reducing friction, minimizing wear, evacuating heat and removing contaminants, the main struggle in this research area nowadays is the continuous search for both improving efficiency and developing greener lubricants. This fact is mainly related to the greater awareness of the pollutant effects on the environment of the human activity [4,5].…”

Section: Introductionmentioning

confidence: 99%

Two fatty acid anion-based ionic liquids - part I: Physicochemical properties and tribological behavior as neat lubricants

Sernaglia

Blanco

Battez

et al. 2020

Journal of Molecular Liquids

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Two new ionic liquids ([N 6,6,6,6 ][C 8:0 ] and [N 6,6,6,6 ][C 16:0 ]) synthetized from fatty acids through a salt metathesis reaction were both characterized from a physicochemical and tribological point of view. Density, viscosity, corrosion activity and thermal stability tests were performed before making tribological tests under ball-on-disc both unidirectional (with fixed and variable slide-to-roll ratio) and reciprocating configuration. The main results of this work were the following: the longer the length of the alkyl chain of the anion the lower both viscosity and density and higher both viscosity index and thermal stability; these ionic liquids (ILs) are not corrosive; the [N 6,6,6,6 ][C 16:0 ] behaved better changing from elastohydrodynamic to mixed lubrication regime at lower speeds; their antiwear behavior at high load seems depend on their viscosity (for tests made at room temperature) and thermal stability and IL-surface interaction (for tests made at high temperature).

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Section: Introductionmentioning

confidence: 99%

Two fatty acid anion-based ionic liquids - part I: Physicochemical properties and tribological behavior as neat lubricants

Sernaglia

Blanco

Battez

et al. 2020

Journal of Molecular Liquids

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“…The difference could be related to the smaller content of unsaturation in fatty acids of 18 carbons, in which oleic acid can play a significant role. According to Mannekote et al [21], higher percentages of oleic acid in the oil result in a tightly packed film of carbon chains, which confers better protection, resulting in lower friction and wear. Lower areas below the curve in the region of the -CH=CH-absorption bands correspond well to the expected theoretical value of unsaturation content in this type of oil (see Fig.…”

Section: Discussionmentioning

confidence: 98%

Laboratory and field performance of biodegradable release agents for hydraulic concrete

et al. 2015

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Raw vegetable oils and their emulsions have been used as biodegradable release agents for concrete. However, there is no scientific explanation linking the chemical composition to their release performance. The present study was divided into two phases. In the first phase, different vegetable oils with varying degrees of refinement were chemically characterized by middle range Fourier transform infrared spectroscopy (Mid-FTIR), and their viscosities were measured. For comparison purposes, two commercial release agents based on mineral oil were used. In the second phase, emulsions containing bleached soybean oil, water and some emulsifiers were prepared. The performance of the oils and emulsions as demolding agents in steel/concrete interfaces was measured by visual rating, image analysis and bond strength. The results indicate that almost all of the vegetable oils showed better performance than that of the two mineral oil-based agents, which is explained by the higher affinity of glycerol esters for metal surfaces and higher intermolecular interactions. The Mid-FTIR espectrum analysis indicates that oils having larger absorption areas under the curve at the methylene group exhibit better performance as release agents. In addition, the Mid-FTIR analysis allowed identification of the main molecular groups and differentiation between oil samples. In the second phase, the water/oil emulsion stabilized with organophilic clay performed the best. In addition to the lubricating effect of the emulsion, the better performance was also due to the saponification reaction between the acylglycerides and the Ca(OH) 2 . The tangential adhesion was reduced to approximately 64 % compared to that of a mold without a release agent.

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“…Synthetic and bio‐lubricants have been employed to study the friction and wear properties of different metallic tribo‐pairs 33–38 . Synthetic lubricants refer to those produced artificially by chemical compounds.…”

Section: Introductionmentioning

confidence: 99%

Enhancement in tribological performance of plastic oil by solid lubricant additives

Sikdar

Rahman

Ralls

et al. 2023

Lubrication Science

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In this study, plastic oil (PO) as a potential lubricant was investigated. The base PO was incorporated with graphene nanoplatelets (GNP) and hexagonal boron nitride (hBN) nano additives in varying concentrations to form nano lubricants. Their viscosity, tribological, acidic/basic nature, thermal degradation and dispersion stability properties were investigated. It was observed that 1.5 wt% GNP and 1.0 wt% hBN added separately to the base PO, provided the lowest coefficient of friction (COF) and wear volume. Based on these lowest COF and wear volume insights, three nano lubricant mixtures were formulated by incorporating both GNP and hBN at different combinations using base PO. Positive synergistic behaviour was observed for COF (49%–60% reduced) and wear volume (90%–97% reduced) for two combination mixtures compared to the base PO. These improvements in the mixture were due to the polishing, mending mechanisms and tribofilm that protected the interacting surfaces.

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Tribology of Green Lubricants

Cited by 14 publications

References 48 publications

Two fatty acid anion-based ionic liquids - part I: Physicochemical properties and tribological behavior as neat lubricants

Two fatty acid anion-based ionic liquids - part I: Physicochemical properties and tribological behavior as neat lubricants

Laboratory and field performance of biodegradable release agents for hydraulic concrete

Enhancement in tribological performance of plastic oil by solid lubricant additives

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