Enhanced Lubrication Ability of Polyalphaolefin and Polypropylene Glycol by COOH-Functionalized Multiwalled Carbon Nanotubes as an Additive

Kumar, Homender; Harsha, A. P.

doi:10.1007/s11665-020-05450-0

Cited by 14 publications

(10 citation statements)

References 45 publications

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“…25,41 The vibrational peaks in the range between 2800 and 3000 cm À1 were explicitly evident as asymmetric and symmetric stretches of methylene and methyl chains. 14,23 The aforementioned finding confirms that COOH molecules were physiosorbed on the basal plane of MWCNTs nanomaterials. Furthermore, the broad peak in the range between 3100 and 3600 cm À1 appeared due to the stretching mode of O H vibration.…”

Section: Chemical and Morphological Characterisation Of Oa-laf 3 And ...supporting

confidence: 63%

“…The tribological performance of polypropylene glycol (PPG 2000) enriched with (0.025 wt%) functionalized MWCNTs improved significantly. 14 Similarly, in the presence of functionalized MWCNTs, the lubrication behaviour of PAO 4 and PAO 6 was significantly improved. 15,16 Due to their relatively low hardness, good resistance to thermal and chemical attack, high melting point and hexagonal crystal structure, the rare earth compound-based nanoparticles demonstrated significant potential as an additive in various lubricating oils to reduce friction and wear.…”

Section: Introductionmentioning

confidence: 95%

“…The peak was observed at $670 cm À1 due to the stretching vibration of C O C functionalities. 14 A broad vibrational peak at $1052 cm À1 was ascribed to C O functionalities. 2 The vibrational peak at $1552 cm À1 and another peak at $1637 cm À1 are attributed to in-plane stretching of the sp 2 -hybridised structure (υC C).…”

Section: Chemical and Morphological Characterisation Of Oa-laf 3 And ...mentioning

confidence: 99%

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Tribological evaluation of PAO 100 oil‐based lithium greases with chemically functionalized nanoadditives

Kumar

Harsha

Rawat

2023

Lubrication Science

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The lubricating greases employed in this study were formulated with polyalphaolefin (PAO) 100 as the base oil and 12‐lithium hydroxystearate as the thickener. The sol–gel method was used to produce the LaF3 nanoadditives. The oleic acid‐treated LaF3 (i.e., OA‐LaF3) and carboxylic acid‐treated MWCNTs (i.e., COOH‐MWCNTs) were blended in the formulated grease samples and used as nanoadditives. The detailed microstructural and chemical properties of chemically treated nanoadditives were investigated using HR‐TEM, XRD, FTIR and XPS analyses. Using a four‐ball tester, the effect of different concentrations of nanoadditives on the tribo‐performance of greases was investigated. Tribo‐test results revealed the role of nanoadditives in PAO‐based grease lubrication performance. COOH‐MWCNTs and OA‐LaF3 nanoadditives outperformed PAO grease in terms of physicochemical and tribo‐performance for steel‐steel tribo‐pair. The improved tribo‐performance is attributed to the formation of tribo‐film on the contact interfaces via nanoadditives. The development of tribo‐film was confirmed by XPS analysis of worn surfaces.

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Section: Chemical and Morphological Characterisation Of Oa-laf 3 And ...supporting

confidence: 63%

Section: Introductionmentioning

confidence: 95%

Section: Chemical and Morphological Characterisation Of Oa-laf 3 And ...mentioning

confidence: 99%

See 1 more Smart Citation

Tribological evaluation of PAO 100 oil‐based lithium greases with chemically functionalized nanoadditives

Kumar

Harsha

Rawat

2023

Lubrication Science

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“…Cornelio et al [ 41 ] studied the lubrication performance of COOH-functionalized CNTs and found that the polar functional group not only improved the CNTs’ dispersion stability, but also facilitated the adsorption of CNTs on friction surfaces, and thus can effectively reduce the friction coefficient and wear rate of both oil and water systems. Kumar et al [ 42 ] also used COOH -functionalized MWCNTs, which effectively improved the lubricity properties of polyalphaolefin (PAO100) and polypropylene glycol (PPG 2000). In the initial test phase, the friction protective film was not formed and the addition of MWCNTs deteriorated the lubricity of the lubricant oil instead.…”

Section: Single Nanoadditivementioning

confidence: 99%

A Review of Nanomaterials with Different Dimensions as Lubricant Additives

et al. 2022

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Lubricant additives can effectively enhance the performance and environmental adaptability of lubricants and reduce the energy loss and machine wear caused by friction. Nanomaterials, as important additive materials, have an essential role in the research and development of new lubricants, whose lubrication performances and mechanisms are not only related to their physical and chemical properties, but also influenced by the geometric shape. In this paper, the friction reduction and antiwear performances of nanomaterials as lubricant additives are first reviewed according to the classification of the dimensions, and their lubrication mechanisms and influence rules are revealed. Second, the recent research progress of composite nanomaterials as lubrication additives is introduced, focusing on their synergistic mechanism to improve the lubrication performance further. Finally, we briefly discuss the challenges faced by nanoadditives and provide an outlook on future research. The review expects to provide new ideas for the selection and development of lubricant additives to expand the application of nanoadditives.

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“…At present, polyalkylene glycols (PAGs) and polyalphaolefins (PAOs) are the most common types of lubricant used in drilling fluids. PAOs are favored in synthetic mud due to their remarkable lubricating properties, and are applied to wellbore cleaning, shale stabilization, and bit cooling and lubrication [ 154 ]. Nonetheless, PAOs possess drawbacks, including small range of viscosity and low polarity [ 155 ].…”

Section: Effects Of Nanomaterials In Drilling Fluidsmentioning

confidence: 99%

Utilization of Eco-Friendly Waste Generated Nanomaterials in Water-Based Drilling Fluids; State of the Art Review

et al. 2021

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An important aspect of hydrocarbon drilling is the usage of drilling fluids, which remove drill cuttings and stabilize the wellbore to provide better filtration. To stabilize these properties, several additives are used in drilling fluids that provide satisfactory rheological and filtration properties. However, commonly used additives are environmentally hazardous; when drilling fluids are disposed after drilling operations, they are discarded with the drill cuttings and additives into water sources and causes unwanted pollution. Therefore, these additives should be substituted with additives that are environmental friendly and provide superior performance. In this regard, biodegradable additives are required for future research. This review investigates the role of various bio-wastes as potential additives to be used in water-based drilling fluids. Furthermore, utilization of these waste-derived nanomaterials is summarized for rheology and lubricity tests. Finally, sufficient rheological and filtration examinations were carried out on water-based drilling fluids to evaluate the effect of wastes as additives on the performance of drilling fluids.

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Enhanced Lubrication Ability of Polyalphaolefin and Polypropylene Glycol by COOH-Functionalized Multiwalled Carbon Nanotubes as an Additive

Cited by 14 publications

References 45 publications

Tribological evaluation of PAO 100 oil‐based lithium greases with chemically functionalized nanoadditives

Tribological evaluation of PAO 100 oil‐based lithium greases with chemically functionalized nanoadditives

A Review of Nanomaterials with Different Dimensions as Lubricant Additives

Utilization of Eco-Friendly Waste Generated Nanomaterials in Water-Based Drilling Fluids; State of the Art Review

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