JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Xiaogang Shang,Songwei Zhang,Huimin Yang,Songbo Li,Litian Hu
In this study, four types of ionic liquids (ILs) were synthesized and their high-temperature tribological and extreme pressure properties in pentaerythritol ester (PE) oil were systematically evaluated. Compared with commercial additive zinc dialkyl dithiophosphates (ZDDP), ILs markedly improve the load-bearing capacity and high-temperature lubrication performance of PE oil. In particular, 2-n-undecylimidazolium O,O-dioctyl dithiophosphate ([C 11 -IM][C 8 -DDP]) showed the best lubricating effect at high temperature. The tribo-film of worn surface was analyzed by SEM, EDS, XPS and FIB-TEM, and the lubrication mechanism of ILs was systematically studied. Results proved that the tribochemical reactions occurred between ILs and the worn surface, resulting in the formation of a tribo-film consisting of Fe 2 O 3 , FePO 4 , FeS, Fe x (SO 4 ) y and nitrogenous organic compounds.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Xiangyu Ge,Jinjin Li,Hongdong Wang,Chenhui Zhang,Yuhong Liu,Jianbin Luo
The liquid-superlubricity state has rarely been studied under an average contact pressure exceeding 300 MPa at the macroscale . In this work, a robust macroscale liquid-superlubricity state (μ ≈ 0.005) under an extreme pressure of 600 MPa was reported, which was enabled by the combination of graphene-oxide (GO) nanosheets with an ionic liquid (IL) between the frictional pairs of Si 3 N 4 /sapphire. The analysis indicated that a composite boundary layer (formed by IL) at the interface contributed to the excellent antiwear performance, thereby providing a lubricating condition under extreme pressure. Notably, GO nanosheets were directly observed to adsorb on worn surfaces, thereby proving the transformation of the shear interface from Si 3 N 4 /sapphire into GO/GO nanosheets. The extreme pressure property and extremely low shear stress between the interlayers of GO nanosheets contributed to the achievement of superlubricity. Therefore, the synergistic effect between GO nanosheets and IL played a dominant role in achieving liquid-superlubricity under extreme pressure at the macroscale. This study provided a novel method to achieve liquid-superlubricity under extreme conditions—by the synergistic effect of 2D materials and liquid molecules—accelerating the achievement of liquid-superlubricity in industrial applications.
研究领域:
材料科学
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摩擦学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Technological Sciences
·
2024
·
IF 4.4
Niu WenXing,Zhao XinRui,Yuan Min,Hou ZhiGuo,Liu Lei,Xu Hong,Dong JinXiang
We studied different long-chain ammonium ions intercalated zirconium phosphate α-ZrP, methylamine intercalated ZrP (MA-ZrP), tetramethylammonium hydroxide intercalated ZrP (TMAH-ZrP), dodecyltrimethylammonium bromide intercalated ZrP (DTAB-ZrP), and stearyl trimethyl ammonium bromide intercalated ZrP (STAB-ZrP) as grease co-additives in combination with isobutylene sulfide (SIB). The grease with co-additives displayed excellent extreme-pressure and anti-wear performance. Moreover, the combination of the longest chain ammonium ion intercalated zirconium phosphate, STAB-ZrP/SIB, had the best tribological properties. In comparison to α-ZrP, the advantage of STAB-ZrP was that it did not form a large area of the dense physical film like α-ZrP on the worn surface, but rather gave the SIB a chance to contact with the fresh metal surface to generate a chemical film. Therefore, the sub-micron physical film and nanoscale chemical film always exist side by side on the contact surface during the friction process. This intercalated α-ZrP/SIB additive has great potential for use in harsh operating conditions.
研究领域:
材料科学
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摩擦学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xiaopeng Wang,Yi Yang,Sensen Xuan,Guoqiang Li,Jiasong Liu,Yuegan Song,Yuan Wang,Yucai Ge,Xiaoxin Li,Yi Long,Qin Zeng,Huijuan Li,Jiaxin Yu
Ice accretion caused by freezing rain or snowstorms is a common phenomenon in cold climates that seriously threatens the safety and reliability of telecommunication lines and other overhead networks. Various anti-icing strategies have been demonstrated through surface engineering to delay ice formation. However, existing anti-icing surfaces still encounter several challenges; for example, surfaces are prone to ice-pinning formation due to the impact of supercooled droplets, which leads to a loss of anti-icing effectiveness. In this study, a mushroom-like cross-scale surface (MCS) with extreme pressure resistance and superior anti-ice-pinning property was reported. Specifically, the designed MCS, featuring multiscale microfeatures, re-entrant structure, heterogeneous sidewalls, and nanoscale particles, exhibits excellent anti-icing properties. Ice formation was determined to occur through a process involving liquid penetration, condensation, icing, and frost filling. By establishing an anti-ice -pinning model and a bubble column model, the relationship between structural characteristics and anti-icing performance was clarified. The MCS demonstrates excellent static liquid repellency (contact angle >167°) and robust dynamic impact resistance (water impact with Weber number ≥300). Furthermore, it exhibits an ultralow ice adhesion strength of 0.46 kPa. Notably, the ice adhesion strength remains below 5 kPa even after 15 deicing cycles. The anti-ice-pinning mechanism and robust icephobicity induced by the micromorphologies of MCS provide valuable insights for effective anti-icing prospects in telecommunication line surfaces and other areas in the field of information and communication technology.
研究领域:
材料科学
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工程技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRIBOLOGY INTERNATIONAL
·
2020
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IF 4.271
Jiasheng Hu,Yujuan Zhang,Guangbin Yang,Chuanping Gao,Ningning Song,Shengmao Zhang,Pingyu Zhang
Forming carbon based tribo-film in situ is an environmentally friendly and efficient way to solve the boundary lubrication problem. In this paper, the cubic nickel nanoparticles (average particle size 21.3 nm) modified by oleylamine were used as additives of poly-alpha-olefin (PAO6) for extreme pressure (EP) lubrication between bearing steel and stainless steel. It was found that in the range of 1.4–2.2 GPa contact pressure, nickel nanoparticles can catalyze the carbonization of PAO6 on the friction surface, which reduced the wear rate by 94%, the friction coefficient (COF) by 79%, and can withstand the extreme pressure friction of 4.2 GPa. XPS , EDS, TEM and FIB were used to analyze the microstructure, composition and chemical state of tribo-film. The tribo-film is composed of oxide layer, concrete structure layer and amorphous carbon layer. The oxide layer formed by oxidation of steel surface produced better binding force with the steel substrate. Nickel nanoparticles catalyze the carbonization of PAO6 to form a concrete structure with nickel nanocrystals embedded in the amorphous carbon phase, which provides high bearing capacity. The carbon layer graphitizes under the friction induction to form a lubricating layer with low friction characteristics. Oleylamine modified nickel nanoparticles is expected to be widely used as an environmentally friendly EP additive .
研究领域:
材料科学
·
摩擦学
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2013
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IF 1.536
Guangbin Yang,Jinfeng Zhang,Shengmao Zhang,Laigui Yu,Pingyu Zhang,Baoli Zhu
The tribological properties of two as-synthesized triazine derivatives were evaluated with a four-ball machine. Results show that the triazine derivatives show good antiwear and extreme pressure properties. Besides, the difference in the tribological properties of the triazine derivatives is closely related to the difference in their molecular structure. Namely, a synergistic tribological effect of the N-containing heterocyclic species and borate ester group in as-synthesized lubricant additive improves the antiwear performance of base stock. Moreover, a protective film containing B 2 O 3 , Fe 2 B, ammonium salt and so on is formed on worn surfaces to improve antiwear ability and load-carrying capacity of the lubricants.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
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IF 8.4
Fan Xu,Haolin Li,Bingyu Tian,Kun Cui,Rui Dong,Mingjin Fan,Meirong Cai,Feng Zhou,Weimin Liu
Owing to the green, high-performance, and application-specific work conditions, water-based lubricating systems show unlimited potential for chemical engineering development. The interfacial behavior of functional additives in aqueous systems is complex and variable due to polarity and interfacial activity, thus showing important research significance. Herein, five novel ionic liquids were synthesized; their unique interfacial behavior in the polar water system contributes a lot to the advanced corrosion resistance and the improved extreme pressure-bearing capacity. The polar groups in the molecular structure of ionic liquids can adsorb preferentially in competition with water molecules, resulting in the formation of an adsorption layer with a high elastic modulus on the metal surface. Benefiting from the tribochemical reaction and the strong polar adsorption effect, the tribofilm at the sliding asperity exhibited effective antiscuffing and antiwear performance. Moreover, their characteristic cationic groups enrich the driving force of the molecular self-assembly process and enhance the ability to form ordered molecular aggregates, whose behavior in an aqueous system facilitates super-robust lubricity. This work can promote the in-depth understanding, future design, and optimization of the aqueous lubricating system, providing content enrichment and expansion for the lubrication technology for harsh service conditions.
研究领域:
材料科学
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化学工程
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Bioresources and Bioproducts
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2020
·
IF 0
Haiyang Ding,Xiaohua Yang,Lina Xu,Mei Li,Shouhai Li,Sujing Zhang,Jianling Xia
Two environmentally friendly, water-based lubricant additives (phosphorus-containing ricinoleic acid (PRA) and sulfur-containing ricinoleic acid (SRA)) were prepared. The lubrication performance of the additives in a water-based lubricant was tested using a four-ball tribotester. The stainless steel surface was analyzed by using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The additives reduced the coefficient of friction (COF) value, wear scar diameter (WSD) and improved the extreme pressure (PB) value. Water-based fluids containing the PRA exhibited lower COF, WSD, and PB values than the SRA. The good tribological performances of the PRA and SRA were attributed to the synergistic action of long aliphatic chains and highly active phosphorus and sulfur elements.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Keying Hua,Yongjia Shi,Miaomiao Tang,Xiangyu Zuo,Jun Gao,Xia Zhang
Water-based lubricants are essential in the field of tribology , and the application of nanoparticles as additives in water-based lubricants shows promise and significant practical importance. In this study, water-soluble Cu nanoparticles modified with methoxypolyethyleneglycol xanthate long-chain polymers were fabricated by a in-situ surface modification method. The tribological behavior of the Cu nanoparticles synthesized as additives in a water-PEG system was evaluated using a universal micro-tribotester. It was found that the synthesized nanoparticles could be stably dispersed in the water-PEG system and could enhance the tribological properties and load-carrying capacity of the system significantly. For example, the coefficient of friction could be reduced to 0.052, and the P B value increased to 588 N when the Cu nanoparticles were added at a mass fraction of 1.5 %. This was mainly attributed to the formation of a boundary lubrication film consisting of Cu, Fe 2 O 3 , Fe 2 (SO 4 ) 3 , and FeS throughout the entire friction process. The boundary film effectively prevents direct contact between the friction surfaces, thereby improving the tribological properties. The incorporation of Cu nanoparticles as additives into commercial cutting fluids resulted in a lower coefficient of friction and significantly enhanced the extreme pressure performance of the cutting fluids, demonstrating promising application prospects.
研究领域:
材料科学
·
机械工程
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Anlin Xu,Ziyan Yang,Zhiyi Zhou,Pu Yang,Yang Yu,Jiayang Liu,Yunhai Zhang
Hydrogen peroxide (H 2 O 2 ) synthesis by electrochemical two-electron oxygen reduction has garnered increasing interest as a wide range of potential applications. Gas diffusion electrodes (GDEs) can effectively promote the H 2 O 2 production efficiency by overcoming the oxygen mass transfer limitations but strongly influenced by the electrowetting process along the long-term operation. In this study, the effect of trans -electrode pressure (TEP) of GDE cathode on the electrowetting process was further elucidated. We controlled the TEP values of four types of GDEs: two Ni-based GDEs and two carbon cloth GDEs prepared by hot-pressing or brushing carbon black. SBA-15 was further used to regulate the microstructure of one Ni-based GDE. It was found that an optimal range of TEP occurred for all tested GDEs in terms of the max. concentration, the yield efficiency, the energy consumption, and the stability because TEP may change the triple-phase interface and influence the anti-electrowetting effect. The porosity of hot-pressed Ni GDE can maintain the TEP window and thus enhance the production of H 2 O 2 , likely via creating oxygen-containing functional groups and a bimodal pore structure on the electrode, revealed with several characterization techniques including SEM, CA, XPS , Raman spectra, CV and EIS . The porous Ni GDE presented an efficient and stable production of H 2 O 2 for 10 cycles: yielding H 2 O 2 at 4393.2–4602.2 mmol m −2 h −1 with current efficiencies of 94.2–98.7%. The best accumulated H 2 O 2 concentration can reach up to 3.58 ωt% H 2 O 2 at 10 h. The results provide an important reference for the industrial scaleup of electro-production of H 2 O 2 with GDEs.
研究领域:
电化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Jinglun Guo,Zhenling Shang,Yue Sun,Chenghao Li,Jianyi Xia,Yuxin Zou,Kang Du,Guoqiang Liu,Feng Zhou,Weimin Liu
Perfluoropolyether (PFPE) lubricant is widely used in plenty of cutting-edge technologies because of its extraordinary properties. However, poor boundary lubrication and creep limit their further applications. Here, we demonstrated a PFPE supramolecular gel with surface-functionalized Ti 3 C 2 T x as additives for highly efficient boundary lubrication and prevention of creep. It turned into an oily liquid at 124.5 °C, accompanied by a rapid decrease in viscosity. Additionally, the phase transition could be achieved by shear stress. This kind of gel reduced wear volume by 90.75% compared with pure PFPE oil. Its friction coefficient (∼0.113) varied slightly with time. Notably, its load-bearing capacity exceeded 1500 N. This work puts forward an approach to the preparation of PFPE-based supramolecular gel lubricant with surface-functionalized Ti 3 C 2 T x additive.
研究领域:
材料科学
·
润滑工程
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Xia Li,Yi Li,Huimin Yang,Anjie Liu,Songwei Zhang,Litian Hu
The demand of high-performance additives suitable for lubricating grease is increasing with the development of high-end equipment. Herein, a novel thiophosphate 3-(O, O- di-nonylphenol di-thiophosphate)-2-methylpropanoic acid (NDMA) was synthesized and added to lithium complex grease as an extreme pressure and anti-wear additive. The physicochemical, rheological, and tribological properties of NDMA were studied and compared with ZDDP. The results indicate that NDMA can improve and enhance oil separation under pressure and dropping point. NDMA showed better shearing resistance, friction reducing, anti-wear and load carrying capability than ZDDP. The lubrication mechanism of NDMA was demonstrated through molecular dynamics simulation. The results indicate that NDMA has strong adsorption capacity on sliding surfaces, promoting the tribo-chemistry reaction between NDMA and iron surfaces.
研究领域:
材料科学
·
润滑工程
·
表面工程
✓ 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）