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Stable dispersibility of bentonite-type additive with gemini ionic liquid intercalation structure for oil-based drilling

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Friction 2023年第2期11卷 201-215页

作者： Chaoyang ZHANG rui dONG Xingang WANG Yijing LIANG Ming ZHANG Qiangliang YU Zhongping TANG Huiying LV Liping WANG Meirong CAI Feng ZHOU Weimin LIU State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100039China PetroChina Lanzhou lubricating Oil r&d Institute Lanzhou 730060China

In this study,the direct intercalation of gemini ionic liquids(ILs)with different alkyl chains into the bentonite(BT)interlayer as a high-performance lubricating additive for base oil 500SN was *** purpose of modifying BT with an IL is to improve the dispersion stability and lubricity of BT in lubricating *** dispersibility and tribological properties of IL–BT as oil-based additives for 500SN depend on the increase in interlamellar space in BT and improve as the chain length is *** importantly,the IL–BT nanomaterial outperforms individual BT in improving wear resistance,owing to its sheet layers were deformed and sprawled in furrows along the metal surface,thereby resulting in low surface *** of its excellent lubrication performance,IL-modified BT is a potential candidate for the main component of drilling *** can be used as a lubricating additive in oil drilling and oil well construction to reduce equipment damage and ensure the normal operation of equipments.

关键词： ionic liquid modified bentonite nanomaterial oil-based additive

Tribological study of two ammonium chloride-decanoic acid deep eutectic solvents(dESs)as high-performance lubricants

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Friction 2024年第11期12卷 2441-2457页

作者： Zhuocheng LI Enhui ZHANG Weimin LI Haichao LIU State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Zibo Innovation center of High-End Synthetic lubricating materials Zibo 255000China

deep eutectic solvents(dESs)are acknowledged as a novel class of functional *** share similar physical properties with ionic liquids(ILs)and have the potential to be a novel class of *** this study,two dESs,namely tetrabutylammonium chloride-decanoic acid dES(C4-dES)and methyl tricaprylmethylammonium chloride-decanoic acid dES(C8-dES),were synthesized,and their physico-chemical properties and tribological performances were ***-analysis of the rubbing surfaces used multiple techniques to gain insights into the lubrication *** show that the coefficient of friction(COF)and wear were reduced by approximately 29%and 91%for the C4-dES,and 36%and 94%for the C8-dES,compared to an ester base *** friction reduction behavior of the dESs is attributed to the monolayer adsorption of the polar group in the decanoic acid(dEAC),whose effectiveness is affected by the component of the ammonium salts in the dESs and the operating *** addition to the adsorbed film,worn surface analysis revealed that an ultra-thin tribochemical film with a thickness of 3–7 nm was formed on the surfaces lubricated with the *** composition of the film was studied,and the lubrication mechanisms of the two dESs were discussed.

关键词： deep eutectic solvent(dES) lubricants tribological performance boundary lubrication

Origin of the tribofilm from MoS_(2) nanoparticle oil additives: dependence of oil film thickness on particle aggregation in rolling point contact

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Friction 2021年第6期9卷 1436-1449页

作者： Hongxing WU Liping WANG Guangneng dONG State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China Petro China Lanzhou lubricating Oil r&d Institute Lanzhou 730060China Key Laboratory of Education Ministry for Modern design and rotor-Bearing System Xi'an Jiaotong UniversityXi'an 710049China

The lubrication effectiveness of MoS_(2) nanoparticles as an oil additive remains unclear,restricting its application in industry to reduce *** goal of this work was to explore the lubrication mechanism of MoS_(2) nanoparticles as an oil *** this study,the oil film thickness behaviors of MoS_(2) nanoparticles in poly-alpha olefin(PAO4)base oil,PAO4 with 3 wt%dispersant(polyisobutyleneamine succinimide,PIBS),and 0W20 engine oil were investigated using an elastohydrodynamic lubrication(EHL)testing *** the EHL tests,the flow patterns around the contact area and the tribofilm covering rate on contact area were studied using optical microscopy to understand the lubrication *** results indicate that both the dispersant and nanoparticle aggregation significantly affected the oil film *** expected oil film thickness increase in the case of 0.1 wt%MoS_(2) in PAO4 base oil was obtained,with an increase from 30 to 60 nm over 15 min at a velocity of 50 mm/*** pattern analysis revealed the formation of particle aggregation on the rolling path when lubricated with 0.1 wt%MoS_(2),which is associated with a tribofilm coverage rate of 41.5%on the contact ***,an oil film thickness increase and particle aggregation were not observed during the tests with 0.1 wt%MoS_(2) blended with 3 wt%PIBS as the dispersant in PAO4 base oil,and for 0.75 wt%MoS_(2) in 0W20 engine *** results suggest that nanoparticles responsible for tribofilm formation originated from aggregates,but not the well-dispersed nanoparticles in point *** understanding should aid the advancement of novel lubricant additive design.

关键词： nanoparticle lubrication oil film thickness flow pattern particle aggregation

Physicochemical and tribological properties of gemini-type halogen-free dicationic ionic liquids

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Friction 2021年第2期9卷 344-355页

作者： Qiangliang YU Chaoyang ZHANG rui dONG Yijun SHI Yurong WANG Yanyan BAI Jiaying ZHANG Meirong CAI Feng ZHOU Weimin LIU State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China lubricating Oil Key Laboratory of Petro China Lanzhou Lubricating Oil Research&Development Institute of Petro ChinaLanzhou 730060China center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China division of Machine Elements LuleåUniversity of TechnologyLuleå97187Sweden

A series of new halogen-free dicationic ionic liquids(ILs)with different alkyl chain lengths were prepared,and the relationship between the alkyl chain length,physicochemical and tribological properties of ILs,and their role as neat lubricant for steel–steel friction pairs,was *** of stability during hydrolysis and copper strip corrosion test results show that synthetic ILs are stable and not corrosive to metal contacts,due to the halogen-free *** friction and wear test results indicate that ILs with long alkyl chains have excellent friction-reducing and anti-wear properties,especially at high *** on the surface three-dimensional(3d)profiles,electrical contact resistance,scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EdS),and the X-ray photoelectron spectrometry(XPS)analysis of the worn surfaces of steel discs,we can conclude that the efficiency of ILs is due to the formation of high quality tribofilms that consist of both tribochemical reaction and ordered absorption films.

关键词： halogen-free dicationic ionic liquids(ILs) lubricant tribofilm

Molecular design, synthesis strategies and recent advances of hydrogels for wound dressing applications

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Chinese Journal of Chemical Engineering 2021年第2期34卷 308-320页

作者： dan Zeng Shihong Shen daidi Fan Shaanxi Key Laboratory of degradable Biomedical materials Shaanxi R&D Center of Biomaterials and Fermentation EngineeringSchool of Chemical EngineeringNorthwest UniversityXi’an 710069China

With the changes in the modern disease spectrum,pressure ulcers,diabetic feet,and vascular-derived diseases caused refractory wounds is increasing *** development of wound dressings has partly improved the effect of wound ***,traditional wound dressings can only cover the wound and block bacteria,but are generally powerless to recurrent wound infection and tissue *** is an urgent need to develop a new type of wound dressing with comprehensive performance to achieve multiple effects such as protecting the wound site from the external environment,absorbing wound exudate,anti-inflammatory,antibacterial,and accelerating wound healing *** wound dressings have the aforementioned characteristics,and can keep the wound in a moist environment because of the high water content,which is an ideal choice for wound *** review introduces the wound healing process and the development and performance advantages of hydrogel wound *** choice of different preparation materials gives the particularities of different hydrogel wound *** also systematically explains the main physical and chemical crosslinking methods for hydrogel ***,in-depth discussion of four typical hydrogel wound dressings including double network hydrogels,nanocomposite hydrogels,drug-loaded hydrogels and smart hydrogels fully demonstrates the feasibility of developing hydrogels as wound dressing products and their future development trends.

关键词： Hydrogels Wound dressing Molecular design Crosslinked networks Biomedical applications

An inorganic–organic hybrid CQds@PVP lubricant additive:Achieving low friction and wear in PEG and water

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Friction 2024年第10期12卷 2281-2297页

作者： Tao YANG Xiaozhen WANG Huanchen LIU Qin ZHAO Kuiliang GONG Weimin LI Yongmin LIANG Xiaobo WANG State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Zibo Innovation center of High-end Synthetic lubricating materials Zibo 255000China

High-temperature lubrication has always been a hot topic in the lubricant and grease industry,and is also an essential concern in the high-end equipment sector to be *** quantum dots(CQds)are an emerging material widely applied in the field of lubrication,owing to their exceptional lubricity and high load-bearing ***,the vulnerability of CQds to oxidation in air and reduced stability dramatically restrict their high-temperature application *** this study,a nanocomposite of amphiphilic polyvinyl pyrrolidone(PVP)homopolymer with excellent lubricating properties and thermal stability,which is hydrogen bonded to CQds(CQds@PVP),was designed to achieve low friction and wear of lubricants at high *** CQds@PVP are consistently dispersed in both PEG400 and water,and exhibit superior lubricity compared to unmodified CQds at high temperatures(ranging from 200‒150°C and 90‒50°C).Meanwhile,the dense carbon film on the wear surface and the chemically reactive film of iron compounds directly contribute to the enhanced lubrication *** analytical results demonstrate the powerful candidacy of CQds@PVP as a lubrication additive and promote future high-temperature applications of CQds in industrial production.

关键词： high temperature lubricants amphiphilic lubrication additives CQds@PVP lubrication properties carbon film

research progresses of nanomaterials as lubricant additives

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Friction 2024年第7期12卷 1347-1391页

作者： Zhengquan JIANG Yankun SUN Bokang LIU Laigui YU Yuping TONG Mingming YAN Zhongzheng YANG Yongxing HAO Linjian SHANGGUAN Shengmao ZHANG Weihua LI School of materials Science and Engineering North China University of Water Resources and Electric PowerZhengzhou 450045China Institute of Special Friction and lubricating materials North China University of Water Resources and Electric PowerZhengzhou 450045China Nanomaterials Engineering research center Henan UniversityKaifeng 475001China School of Mechanical Engineering North China University of Water Resources and Electric PowerZhengzhou 450045China

Friction and wear are unavoidable in mechanical *** use of lubricants with nano-additives can effectively reduce friction and wear,which is of great significance to saving energy and protecting the *** present,great progress has been made in the scientific research and industrial application of nano-additives for *** paper mainly introduces the types of nano-additives for lubricants(such as carbon nanomaterials,nano-metals,nano-oxides,sulfides,complexes,polymers,etc.),the tribological properties of lubricants with different components of nano-additives,and the lubrication mechanisms of the nano-additives(including tribofilm formation,rolling ball bearing effect,repairing effect,polishing effect,and synergistic effect).It also deals with the dispersion of nano-additives in lubricants and the influences of their particle size and microstructure on the tribological properties of *** review outlines the performance requirements of nano-additives in different lubrication states,discusses the use of nano-additives in challenging working conditions,and identifies various industrial oil nano-additives with reference to the appropriate options in diverse working ***,the existing problems of nano-additives and their application prospects are *** review,hopefully,would help to shed light on the design and synthesis of novel high-performance nano-additives and promote their application in engineering.

关键词： nanomaterials lubricant additive lubrication mechanism research progress

Construction of surface lattice oxygen in metallic N-CuCoS1.97 porous nanowire for wearable Zn-air battery

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Journal of Energy Chemistry 2019年第7期28卷 1-9页

作者： Jie Yin Binbin Wei Yuxuan Li Yefei Li Pinxian Xi State Key Laboratory of Applied Organic Chemistry Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Provinceand College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000GansuChina PetroChina Lanzhou lubricating Oil r&d Institute Lanzhou 730000GansuChina Collaborative Innovation center of Chemistry for Energy Material Key Laboratory of Computational Physical Science(Ministry of Education)Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsDepartment of ChemistryFudan UniversityShanghai 200433China

Achieving high activity and stability oxygen evolution reaction(OEr) catalysts to optimize the efficiency of metal-air battery, water splitting and other energy conversion devices, remains a formidable ***, we demonstrate the metallic porous nanowires arrays with abundant defects via nitrogen and copper codoped CoS1.97 nanowires(N-CuCoS1.97 NWs). The N-CuCoS1.97 NWs can serve as an excellent OEr self-supported electrode with an overpotential of 280 mV(j = 10 m A cm-2) and remarkable long-term stability. The X-ray absorption near-edge structure(XANES) and X-ray photoelectron spectrum(XPS) measurements confirmed the surface lattice oxygen created on the N-CuCoS1.97 NWs during OEr. Then, the density function theory(dFT) results evident that lattice oxygen constructed surface of N-CuCoS1.97 NWs has more favorable OEr energetic profiles and absorption for reaction intermediate. More importantly,the flexible and wearable Zn-air battery fabricated by the N-CuCoS1.97 NWs shows excellent rechargeable and mechanical stability, which can be used in portable mobile device.

关键词： dFT calculation Porous nanowires Electrocatalyst OEr Zn-air battery

The effects of fermentation and adsorption using lactic acid bacteria culture broth on the feed quality of rice straw

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Journal of Integrative Agriculture 2015年第3期14卷 503-513页

作者： LIU Jing-jing LIU Xiao-ping rEN Ji-wei ZHAO Hong-yan YUAN Xu-feng WANG Xiao-fen Abdelfattah Z M Salem CUI Zong-jun College of Agronomy and Biotechnology/center of Biomass Engineering China Agricultural University Plants protecting Station of Agricultural Bureau Agronomy of Yanbian University Faculty of Veterinary Medicine and Animal Science Autonomous University of the State of Mexico

To improve the nutritional value and the palatability of air-dried rice straw, culture broth of the lactic acid bacteria community SFC-2 was used to examine the effects of two different treatments, fermentation and adsorption. Air-dried and chopped rice straw was treated with either fermentation for 30 d after adding 1.5 L nutrient solution（50 m L inocula L–1, 1.2×1012 CFU m L–1 inocula） kg–1 straw dry matter, or spraying a large amount of culture broth（1.5 L kg–1 straw dry matter, 1.5×1011 CFU m L–1 culture broth） on the straw and allowing it to adsorb for 30 min. The feed quality and aerobic stability of the resulting forage were examined. Both treatments improved the feed quality of rice straw, and adsorption was better than fermentation for preserving nutrients and improving digestibility, as evidenced by higher dry matter（dM） and crude protein（CP） concentrations, lower neutral detergent fiber（NdF）, acid detergent fiber（AdF） and NH3-N concentrations, as well as higher lactic acid production and in vitro digestibility of dM（IVdMd）. The aerobic stability of the adsorbed straw and the fermented straw was 392 and 480 h, respectively. After being exposed to air, chemical components and microbial community of the fermented straw were more stable than the adsorbed straw.

关键词： adsorption fermentation lactic acid bacteria culture broth rice straw