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Flower-like NiAl-LDH loaded with coal-to-oil soot nanomaterials as additives for lithium-based grease to improve lubrication properties.

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Title: Flower-like NiAl-LDH loaded with coal-to-oil soot nanomaterials as additives for lithium-based grease to improve lubrication properties.
Authors: Huang, Yue1,2 (AUTHOR), Liu, Tianxia1,3 (AUTHOR) 2005053@nmu.edu.cn, Qiu, Feng2 (AUTHOR), Hu, Xianguo2 (AUTHOR)
Source: Journal of Industrial & Engineering Chemistry. Apr2026, Vol. 156, p912-925. 14p.
Subjects: Lubricant additives, Layered double hydroxides, Molecular dynamics, Nanoparticles, Wear resistance, Nanocomposite materials, Lubrication & lubricants
Abstract: [Display omitted] • A novel lubricant CS/NiAl-LDH was developed. • Flower-like NiAl-LDH uniformly dispersed CS nanoparticles, resulting in excellent anti-wear properties. • Molecular dynamics simulations were used to elucidate the atomic scale lubrication mechanism. Coal-to-oil soot (CS) was collected by using self-made soot capture device. Nickel-aluminum layered bimetallic hydroxide nanoparticles (NiAl-LDH) and nickel-aluminum layered bimetallic hydroxide nanoparticles loaded coal-to-oil soot (CS/NiAl-LDH) composites were prepared using a one-step hydrothermal method. The tribological properties of CS, NiAl-LDH and CS/NiAl-LDH as lubricating additives for lithium grease were investigated by using a controlled atmosphere micro-friction and wear tester. The morphology, composition and friction mechanism of CS, NiAl-LDH and CS/NiAl-LDH were analyzed by means of SEM, HRTEM, FTIR, XPS, EDS, BET, Raman and molecular dynamics simulation. The results show that CS is an aggregate composed of amorphous carbon and graphite microcrystals. NiAl-LDH is mainly composed of highly crystalline flower-like nanosheets, while CS/NiAl-LDH composite is composed of nickel-aluminum bimetallic hydroxide flower-like nanosheets loaded with CS particles. The average friction coefficient (AFC), average wear scar diameter (AWSD) and wear rate were the lowest when the CS/NiAl-LDH additive dosage is 0.2 wt%. Compared with lithium-based greases, the minimum values of AFC and AWSD are reduced by 38% and 52%, respectively, and the maximum wear depth and wear rate are reduced by 68% and 86%, respectively. The results indicate that nanocomposites significantly enhance the tribological properties of lithium-based grease by improving the dispersibility of CS, good interfacial adsorption performance, and synergistic lubrication mechanism between CS and NiAl-LDH. The research results will provide some microscopic scale insights into the dispersion and friction characteristics of hydrotalcite based nano-lubricant additives. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:[Display omitted] • A novel lubricant CS/NiAl-LDH was developed. • Flower-like NiAl-LDH uniformly dispersed CS nanoparticles, resulting in excellent anti-wear properties. • Molecular dynamics simulations were used to elucidate the atomic scale lubrication mechanism. Coal-to-oil soot (CS) was collected by using self-made soot capture device. Nickel-aluminum layered bimetallic hydroxide nanoparticles (NiAl-LDH) and nickel-aluminum layered bimetallic hydroxide nanoparticles loaded coal-to-oil soot (CS/NiAl-LDH) composites were prepared using a one-step hydrothermal method. The tribological properties of CS, NiAl-LDH and CS/NiAl-LDH as lubricating additives for lithium grease were investigated by using a controlled atmosphere micro-friction and wear tester. The morphology, composition and friction mechanism of CS, NiAl-LDH and CS/NiAl-LDH were analyzed by means of SEM, HRTEM, FTIR, XPS, EDS, BET, Raman and molecular dynamics simulation. The results show that CS is an aggregate composed of amorphous carbon and graphite microcrystals. NiAl-LDH is mainly composed of highly crystalline flower-like nanosheets, while CS/NiAl-LDH composite is composed of nickel-aluminum bimetallic hydroxide flower-like nanosheets loaded with CS particles. The average friction coefficient (AFC), average wear scar diameter (AWSD) and wear rate were the lowest when the CS/NiAl-LDH additive dosage is 0.2 wt%. Compared with lithium-based greases, the minimum values of AFC and AWSD are reduced by 38% and 52%, respectively, and the maximum wear depth and wear rate are reduced by 68% and 86%, respectively. The results indicate that nanocomposites significantly enhance the tribological properties of lithium-based grease by improving the dispersibility of CS, good interfacial adsorption performance, and synergistic lubrication mechanism between CS and NiAl-LDH. The research results will provide some microscopic scale insights into the dispersion and friction characteristics of hydrotalcite based nano-lubricant additives. [ABSTRACT FROM AUTHOR]
ISSN:1226086X
DOI:10.1016/j.jiec.2025.09.036