Influence of Oleic Acid–Treated LaF<sub>3</sub> Nanoparticles as an Additive on Extreme Pressure Properties of Various Grades of Polyalphaolefins

Kumar, Homender; Harsha, A. P.

doi:10.1080/10402004.2021.2003495

Cited by 10 publications

(9 citation statements)

References 43 publications

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“…All OA-LaF 3 diffraction peaks are completely consistent with JCPDS reference code 00-008-0461, indicating that LaF 3 nanoparticles have a hexagonal crystalline structure. 33 The absence of any other phases confirms that oleic acid chemical functionalization did not affect the crystal structure of LaF 3 nanomaterials. 36 The diffraction pattern of COOH functionalized MWCNTs nanomaterials is shown in Figure 2b.…”

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

confidence: 76%

“…The LaF 3 nanomaterials were prepared using the sol-gel technique and chemically treated with oleic acid, as previously reported. 33 The COOH-treated MWCNTs were purchased (99%). A high-resolution transmission electron microscope (TEM) was used to examine the nanostructures of OA-LaF 3 and COOH-MWCNTs nanomaterials.…”

Section: Synthesis and Characterisation Of Nanoadditivesmentioning

confidence: 99%

“…The peak with a binding energy of 284.32 eV could be attributed to the presence of adventitious carbon on the surface of the LaF 3 nanoparticles. 33 The other peaks at 286.69 and 287.36 eV are ascribed to the C O bond and the sp 3 carbon atoms bonded to fluorine (i.e., C F bond), respectively. 42,43 The O 1s spectrum of OA-LaF 3 can be deconvoluted into four peaks, as shown in Figure 3c.…”

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

confidence: 99%

“…Simultaneously, LaF 3 nanoparticles get compacted and sintered on the rubbing surfaces to build a protective film on the worn surface due to the tribosintering mechanism. 33 Therefore, it can be concluded that because of the physical properties and low hardness of LaF 3 nanoparticles, the tribosintering phenomenon might most likely occur due to the accumulation of LaF 3 in the grooves of friction surfaces.…”

Section: Proposed Lubrication Mechanismmentioning

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 ...mentioning

confidence: 76%

Section: Synthesis and Characterisation Of Nanoadditivesmentioning

confidence: 99%

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

confidence: 99%

Section: Proposed Lubrication Mechanismmentioning

confidence: 99%

See 2 more Smart Citations

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

Kumar

Harsha

Rawat

2023

Lubrication Science

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“…In addition, the poor dispersion stability of most nanomaterials has been the biggest obstacle on their application process. Although this issue has been remarkably improved by chemical modifications and adding dispersants, absolutely solving the long-term dispersion stability of inorganic nanoadditives in PAO is still a huge challenge. − …”

Section: Introductionmentioning

confidence: 99%

Synthesis of Eco-Friendly Carbon Dots as Self-Repairing Additives of Polyalphaolefin by Means of a Green Solvation Effect

Wang

Lian

Jing³

et al. 2022

Langmuir

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The eco-friendly menthol-modified carbon dots (CDs-Menth) were synthesized for the first time and exhibited the particularly promising application potential as additives of polyalphaolefin (PAO4). On the one hand, the CDs-Menth could be well dispersed into PAO4 with excellent and long-term dispersion stability via a convenient and green mean, that is, the solvation effect of petroleum ether. This mean was far more advanced to current strategies such as chemical modifications and adding dispersants. On the other hand, the CDs-Menth as additives possessed not only the duty-bound merits such as the distinguished friction-reducing, anti-wear, and load-carrying functions, but also an amazing ability of self-repairing effect. The repairing rate of lower disc in the ball-on-disc friction pair lubricated with CDs-Menth/PAO4 lubricant (2.5 wt %) was about 19.3% if the friction duration was prolonged from 20 to 120 min. Meanwhile, the wear volume reduction for PAO4 caused by CDs-Menth remarkably increased from 43.5 to 74.6%. By virtue of the self-repairing effect, the CDs-Menth could form the tough and tensile boundary lubrication films on the rubbing surfaces, not only tremendously reducing the friction and wear of friction pair, but also hopefully protecting the friction interfaces from the potential oxidation and corrosion.

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The Key Role of Grain Boundary Dynamics in Revolutionizing the Potential of Solid Electrolytes

Wang,

Thomas,

Garman

et al. 2024

Adv Funct Materials

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Solid electrolytes (SEs) have the potential to enhance the safety and performance of Li‐metal batteries. However, the existence of grain boundaries in polycrystalline SEs presents a significant challenge for both ionic and electronic migration, promoting the propagation of detrimental lithium dendrites. This study compares the roles of grain boundaries in electrical properties of three distinct SEs including garnet‐type Li6.5La3Zr1.5Ta0.5O12 (LLZO), argyrodite‐type Li6PS5Cl (LPSC), and NASICON‐type Li1+x+yAlx(Ti,Ge)2‐xSiyP3‐yO12 (LATP). Results demonstrate that the electronic and ionic conductivities of solid‐state electrolytes are affected differently by grain boundaries, depending on the specific type of electrolyte. For instance, LLZO and LATP experience dielectric breakdown at 3.7 and 5.3 V, respectively, while LPSC does not exhibit such behavior. Here, a new chemical modification is proposed that simultaneously alters the composition of both the surface and grain boundaries of SEs, ultimately reducing electronic conductivity for the LLZO SEs. Consequently, the proposed LLZO exhibits unprecedented dendrite‐free cycling stability, achieving a remarkable 12 000‐h lifetime at room temperature, surpassing conventional strategies such as surface coatings in dendrite mitigation. This study highlights the significance of modifying grain boundaries to design safe and durable Li‐metal batteries. It provides new insights for developing SEs that are highly resistant to dendrite formation.

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Influence of Oleic Acid–Treated LaF₃ Nanoparticles as an Additive on Extreme Pressure Properties of Various Grades of Polyalphaolefins

Cited by 10 publications

References 43 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

Synthesis of Eco-Friendly Carbon Dots as Self-Repairing Additives of Polyalphaolefin by Means of a Green Solvation Effect

The Key Role of Grain Boundary Dynamics in Revolutionizing the Potential of Solid Electrolytes

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Influence of Oleic Acid–Treated LaF3 Nanoparticles as an Additive on Extreme Pressure Properties of Various Grades of Polyalphaolefins

Cited by 10 publications

References 43 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

Synthesis of Eco-Friendly Carbon Dots as Self-Repairing Additives of Polyalphaolefin by Means of a Green Solvation Effect

The Key Role of Grain Boundary Dynamics in Revolutionizing the Potential of Solid Electrolytes

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Influence of Oleic Acid–Treated LaF₃ Nanoparticles as an Additive on Extreme Pressure Properties of Various Grades of Polyalphaolefins