ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Tianyi Han,Mingbo Zhao,Chuan Sun,Ruiqi Zhao,Wanxing Xu,Shumin Zhang,Sudesh Singh,Jianbin Luo,Chenhui Zhang
Cations can achieve excellent hydration lubrication at smooth interfaces under both microscale and macroscale conditions due to the boundary layer composed of hydration shells surrounding charges, but what about anions? Commonly used friction pairs are negatively charged at the solid/solution interface. Achieving anionic adsorption through constructing positively charged surfaces is a prerequisite for studying the hydration lubrication of anions. Here we report the hydration layer composed of anions adsorbed on the positively charged polymer/sapphire interface at acidic electrolyte solutions with pH below the isoelectric point, which contributes to the hydration lubrication of anions. Strongly hydrated anions (for the case of SO42–) exhibit stable superlubricity comparable to cations, with strikingly low boundary friction coefficient of 0.003–0.007 under contact pressures above 15 MPa without a running-in period. The hydration lubrication performance of anions is determined by both the ionic hydration strength and ion adsorption density based on the surface potential and tribological experiments. The results shed light on the role of anions in superlubricity and hydration lubrication, which may be relevant for understanding the lubrication mechanism and improving lubrication performance in acidic environments, for example, in acid pumps, sealing rings of compressors for handling acidic media, and processing devices of nuclear waste.
研究领域:
材料科学
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化学工程
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表面科学
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产品关联
DOI
PubMed
高影响因子
TRIBOLOGY LETTERS
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2025
·Vol. 73
·期 2
·1-15
·
IF 3.3
Zhang Xiaosheng,He Xuexue,Ma Chong,Kong Xiaowei,Li Gangsen,Qiao Li,Zhang Yanfei,Li Kangwei,Ma Jingyi,Zheng Yuewei,Liu Lei
Developing and utilizing high-extreme pressure (EP) performance solid lubricants has become imperative to meet the lubrication requirements for harsh operating conditions. Based on the action mechanism of rare earth on alloys, the influence of material corrugated layered crystal structure, and sulfur content on lubrication properties at the atomic and molecular levels, layered rare earth sulfates have become a new type of high EP performance solid lubricants. Herein, we prepared layered rare earth sulfate materials (RE 2 (OH) 4 SO 4 ·nH 2 O, RE = La/Sm/Ce, i.e., RES, LaS, SmS, CeS, respectively) using a mild hydrothermal method for controlled particle size and morphology. To evaluate its applicability, we tested the new solid lubricants against high load, high temperature, long-term, different friction pair materials, and fretting. Overall, the RES samples exhibited excellent lubricating behavior when added to polyurea grease, better than MoS 2 . By adding layered lanthanum sulfate, samarium sulfate, and cerium sulfate, the seizure loads can reach up to 1400, 1300, and 1300 N, respectively. Microscopic analysis of the friction pairs confirmed that the lubricating films formed on the worn surface during friction. Excitingly, the RES materials exhibited excellent synergistic effects on EP performance and corrosion resistance. Thus, these materials have broad application prospects as lubricants. Graphical
研究领域:
材料科学
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机械工程
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摩擦学
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无机化学
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纳米技术
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产品关联
DOI
高影响因子
Lubricants
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2025
·Vol. 13
·期 3
·102
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IF 2.9
Weiwei Guan,Xianjun Hou,Youheng Wang,Chen Chu,Mohamed Kamal Ahmed Ali
The development of green lubrication requires nano-lubricants to possess more environmentally friendly fabrication modes and materials with superior tribological properties. This study investigates the tribological properties of nano-biochar in PAO6 base oil and in combination with different additives. The effect of adsorption on friction reduction and anti-wear performance is demonstrated by replacing the friction sub-materials in the four-ball friction test. Based on the comparison of wear region characterization, the incorporation of nano-biochar improves the friction reduction performance of detergent and dispersant base oils with a reduction in coefficient of friction (COF) by 16.7% and 19.0%, respectively, and produces a synergistic effect on the anti-wear performance. When nano-biochar is compounded with anti-wear agents and friction reducer, there is a synergistic effect on friction reduction performance, and COF decreases by 9.4% and 4.5% compared with anti-wear agents and friction reducer base oils, respectively. A method to analyze the friction reduction and anti-wear mechanism of nano-additives in complex lubrication system is proposed, which reveals in depth the interaction law and synergistic lubrication mechanism between NBC and additives in the friction process.
研究领域:
材料科学
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机械工程
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环境科学
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产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Congcong Shi,Huanhuan Zhang,Jiajia Jia,Xin Xing,Ting Li,Yujuan Zhang,Shengmao Zhang
Nano additives exhibit efficient anti-wear and friction reducing properties for various friction materials, thus having broad application prospects in engine oil. The synergistic mechanism between friction modifiers and nano additives is a key issue in the development of energy-saving engine oil. In this paper, the tribological properties of oleylamine (OM) modified CeO 2 nanoparticles and commercial organic friction modifiers glyceryl monooleate (GMO), glycol oleate (T403B), benzotriazole aliphatic amine (T406E) and molybdenum dithiocarbamate (MoDTC) in PAO/DLC solid-liquid composite lubricating system were investigated. It was found that only when CeO 2 nanoparticles were combined with GMO, the anti-wear and friction reduction performance of the system was better than that of nano additives, any friction modifiers, and their combination additives. The synergistic effect was demonstrated in the boundary lubrication range under reciprocating sliding conditions and fully lubricated range in the S-curve experiment under rotating sliding mode. Three-dimensional topography, EDS typical element distribution, and Raman analysis were performed on the worn surface, and the adsorption behavior of additives on metal and DLC surfaces was studied using quartz crystal microbalance (QCM-D). It was found that only lubricated with CeO 2 + GMO, a viscoelastic composite adsorption layer with both high adsorption quality and high adsorption layer density could be formed on the metal and DLC surfaces simultaneously. The adsorption layer has excellent tribological properties of high load-bearing capacity and low friction, which not only overcomes the high friction problem of CeO 2 nanoparticle solid tribofilm, but also avoids the high wear defect of tribofilm formed by friction modifier.
研究领域:
材料科学
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机械工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Wei Wang,Guoxin Xie,Jianbin Luo
Superlubricity is defined as a sliding regime in which friction, or the resistance to sliding of two relatively moving surfaces, almost vanishes. From a practical point of view, the development and use of new materials that can enable superlubricity (coefficient of friction, COF < 0.01) in moving mechanical systems will have huge positive impact on energy-saving and emission reduction. In this work, the use of a new two-dimensional material, black phosphorus (BP) as a high-performance water-based lubricant additive that can significantly reduce friction and achieve superlubricity has been explored. A lowest COF value of 0.0006 ever measured by an application-orientated ball-on-plate tribometer has been found. Robust superlubricity in the aqueous solution with ultrafine BP nanosheets modified by NaOH (BP-OH) has been observed for a wide range of additive concentrations, contact pressures, and sliding velocities owing to the very low shear resistance of the water layer retained by BP-OH nanosheets. This finding has the potential of opening up a new approach to dramatically reduce or even eliminate friction by using BP nanomaterials as lubricant additives.
研究领域:
材料科学
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机械工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Naner Li,Chaobao Wang,Zhenghao Ge,Xinqi Zou,Xiaoqian Weng
Water has many natural advantages for using as an ecological lubricant in engineering. However, how to ensure the efficiency and stability of water lubricating film with low viscosity has been always the key point of practical applications. For this, a strategy is given to improve lubricating capacity of water under loads by combining the biomimetic adhesion and hydration lubrication of polydopamine (PDA). The PDA nanoparticles were polymerized and purified, and its aqueous suspensions were used to solve the difficult problem of lubrication failure when using water as lubricant. The morphology characteristics and lubrication performance of PDA nanoparticles were experimentally tested and analyzed. The results showed that PDA nanoparticles can form an adhesive-lubricating film on the copper balls and effectively reduce the tribological behaviors in rubbing processes. This strategy that combines the biomimetic adhesion and hydration lubrication of PDA provides a novel method to realize targeted hydrated film and excellent water lubrication under load bearing conditions.
研究领域:
材料科学
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生物仿生学
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摩擦学
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产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2022
·
IF 5.62
Runsheng Si,Qiang Ren,Yifeng He,Jun Long
Grease is an important type of lubricant. In this study, a computational simulation strategy suitable for revealing the self-assembled structure of grease and its formation mechanism is investigated by combining the advantages of quantum mechanics, molecular dynamics, and dissipative particle dynamics . The results show that the main driving force of self-assembly of thickener molecules in oil is electrostatic force; the molecular configuration of the thickener changes from a bending to a stretching state during the cooling process. The simulation methods developed in this work are successfully applied to study the formation mechanism of sodium stearate and potassium stearate grease, and the results are in good agreement with the experimental results.
研究领域:
材料科学
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计算化学
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产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Xinqi Zou,Zhenghao Ge,Chaobao Wang,Yuyang Xi
Water lubrication is environmentally benign and widely used in marine stern bearings, but its low viscosity and poor interfacial affinity limit effectiveness on inert polymers like UHMWPE. This study presents a mussel-inspired co-lubrication strategy by integrating polydopamine (PDA) and polyglutamic acid (PGA) into a composite suspension. The PDA–PGA system synergistically enhances interfacial adhesion and hydration lubrication, forming a stable, self-replenishing lubricating film. Tribological tests show a 19.7 % reduction in friction and 21.9 % reduction in UHMWPE wear compared to water. Surface analyses confirm nitrogen-rich film deposition and improved shear resistance. These improvements are attributed to amide bonding, hydrogen bonding, and hydration layer formation. This strategy offers an effective lubrication solution for high-load, submerged UHMWPE–metal systems such as water-lubricated marine bearings.
研究领域:
机械工程
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材料科学
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摩擦学
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船舶工程
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表面化学
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产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 19
·6579
·
IF 3.4
Houjie Zhang,Youming Chen,Aimin Chu,Hairong Hu,Yuping Zhao
The controllable character of the melting point of deep eutectic solvents (DESs) makes it easy to realize lubricated state transitions and produce excellent lubricating properties during friction. In this work, a series of novel imidazole-based DESs were synthesized to present a room-temperature solid state by shifting its eutectic point. Tribological test results show that the wear volume of these DESs decreases as the alkyl chains of the hydrogen bond donors increase. A proper deviation of the eutectic point in DESs produces stable lubricating properties. The present work provides a novel and simple method to prepare solid lubricants and enriches the use of DESs as lubricants. Simultaneously, the method expected to replace the use of conventional cutting fluids.Keywords:deep eutectic solvents;solid lubricants;lubricated state transition;imidazole
研究领域:
材料科学
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摩擦学
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产品关联
DOI
PubMed
高影响因子
TRIBOLOGY INTERNATIONAL
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2024
·
IF 6.1
Shicai Zhu,Ke Han,Yu Tian,Liran Ma
Light-controlled friction and lubrication has a wide prospect in industry and life. The friction coefficient of water lubrication between silicon nitride and titanium dioxide was found to be significantly changed by ultraviolet treatment from superlubricity to near lubrication failure. Under fully flooded conditions, the relative difference in wettability between wear and non-wear zone determined film formation of water lubrication, and its change after ultraviolet treatment aroused the failure of lubrication. While for the starved water lubrication, ultraviolet treatment slowed down the tribo-chemical reaction rate to form smaller particles on wear area, which was more conducive to lubrication and even reduced to superlubricity. Such enormous changes of water lubrication in macroscale may throw a new light on light-controlled friction and lubrication.
研究领域:
材料科学
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摩擦学
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表面工程
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2023
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IF 9.8
Min Xie,Yuxin Luo,Tingting Gao,Rongye Li
Waste plant resource provides a new sustainable feedstock for the biolubricant, and purification of the effective components in biomass oil is vital to improve the performance of biolubricant. In this work, the crude extract of the aerial part of Codonopsis pilosula was divided into four different parts by petroleum ether, ethyl acetate, n-butanol and water, respectively. Their thermal stability, lubricating performances and mechanisms have been systematically investigated. In the four extracts, the petroleum ether extract displays the best thermal stability and lubricating performance over the entire test conditions, and other three extracts are confronted with lubrication failure at high loads and elevated temperatures. Triterpenoid saponin, typical for n-butanol extract exhibit the best lubricity at room temperature, followed by the fatty acid derivatives as phosphatidylcholine; flavonoid, and sugar exhibit poor lubricity. At high temperature, only the petroleum ether extract retains the good lubricity.
研究领域:
生物学
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植物化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2025
·
IF 5.5
Ting Li,Yun Chen,Ziyu Han,Junhai Wang,Xinran Li,Lixiu Zhang,Yunwu Yu
Deep eutectic solvents (DESs) serve as functionalized solvents with superior lubricating properties. However, limited research has been conducted on their application for modifying and treating nanomaterials as nonpolar lubricant additives. Consequently, this paper presents the synthesis of a menthol/thymol/tetradecylphosphonic acid oil-soluble ternary DES, which was employed to modify and treat MXene. The DES facilitates the expansion of MXene’s interlayer spacing, while the grafting of long carbon chains in the DES enhances the dispersion stability of MXene in nonpolar lubricants. Furthermore, the tribological properties of DES complexed MXene lubricant additives were examined, revealing a reduction in the coefficient of friction and wear rate by 46.6 and 56.8% for both 0.1 wt % DES/MXene and 2 wt % DES base oil at 25 °C, and by 40.3 and 48.1% at 100 °C, respectively. The superior lubrication performance is attributed to optimal dispersion stability, exceptional wettability, and the synergistic impact of the dual lubrication film created by DES and the interlayer shear mechanism of MXene.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）