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Tribological behavior of nanocarbon materials with different dimensions in aqueous systems

Friction 2020年第1期8卷 29-46页

作者： Hongmei YANG Jiusheng LI Xiangqiong ZENG laboratory for advanced lubricating materials Shanghai Advanced Research InstituteChinese Academy of SciencesUniversity of Chinese Academy of SciencesShanghai 201210China

Due to the widespread use of nanocarbon materials(NCMs),more researchers are studying their tribological *** this work,the tribological behaviors of the following five types of NCMs with different geometric shapes were evaluated in a novel oil‐in‐water system:spherical fullerenes(C60,0D),tubular multi‐walled carbon nanotubes(MWCNT,1D),sheet graphene oxide(GO,2D),sheet graphene oxide derivative(Oct‐O‐GO,2D),and lamellar graphite(G,3D).Among these,GO with two types of oxidation degrees,i.e.,GO(1),GO(2),and Oct‐O‐GO(1)were synthesized and characterized using Fourier‐transform infrared spectroscopy,Raman spectroscopy,x‐ray diffraction,thermogravimetric analysis,scanning electron microscopy,and contact angle *** load‐carrying capacity of the NCM emulsions were evaluated using a four‐ball test machine,and the lubrication performances were investigated using a high‐frequency reciprocating friction and wear tester with a sliding distance of 1,800 mm under different loads(50 N and 100 N)at 0.5 *** results revealed that the Oct‐O‐GO(1)emulsion exhibited the best load‐carrying capacity,and the best friction‐reducing and anti‐wear properties compared to other ***,the anti‐wear advantage was more prominent under high load conditions,whereas the other emulsions exhibited a certain degree of abrasive or adhesive *** lubrication mechanism was determined through the analysis of worn surfaces using scanning electron microscopy/energy‐dispersive x‐ray spectroscopy,micro‐Raman spectroscopy,and x‐ray photoelectron *** results revealed that during frictional sliding,the ingredients in the emulsion can absorb and react with the freshly exposed metal surface to form surface‐active films to protect the surfaces from ***,it was found that the higher the amount of ingredients that contain alkyl and O‐H/C=O,the better was the lubrication performance in addition to an increase in the carbon residue in the tribofilm gener

关键词： nano‐carbon materials tribological behavior modified graphene oxide oil‐in‐water emulsion

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Stable graphene oxide-based lyotropic liquid crystals for interfacial lubrication

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Friction 2024年第5期12卷 954-967页

作者： Yumei GUO Hanglin LI Jiusheng LI Xiangqiong ZENG laboratory for advanced lubricating materials Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai201210China University of Chinese Academy of Sciences Beijing100049China

Lyotropic liquid crystals have lubricating properties due to their ordered assembly and fluidity,whose mesogens are often characterized by amphiphilic *** the attention that graphene oxide(GO)has been studied as a novel amphiphilic lyotropic mesogen this decade,and GO applied as a lubrication additive has been demonstrated in both oil and water-based systems,little research reveals the interfacial lubrication of GO liquid crystals *** work reports that GO aqueous dispersion can form lyotropic liquid crystals above a specific critical concentration of 5.00 mg/mL,providing a form of stable water-based lubricant,which can keep stable for several months and can reduce friction by 37.3%and wear by 25.24%.The liquid crystal phase was verified by polarizing microscope and synchrotron radiation small-angle X-ray scattering,and its rheological properties and viscoelasticity were studied by interfacial *** formation of lyotropic liquid crystals can enhance the stability of GO aqueous dispersions at high density,simultaneously ensuring friction decrease and anti-wear *** is attributed to the stable nematic network by the ordered GO *** ordered assembly structure bears vertical shear force,therefore,reducing the *** is also assumed that the wide lateral size of graphene oxide promotes the nematic phase thus smoothes the graphene oxide film composed spontaneously under the coincidence of lamellar liquid crystal and 2D layered *** this work,the interlayer lubrication of GO was optimized,and the problem of GO dispersion sedimentation was solved by *** range of interfacial lubrication of GO aqueous dispersion has been expanded and the synergistic effect is conducive to the environmentally friendly lubricants.

关键词： lyotropic liquid crystal graphene oxide aqueous lubrication tribological behavior

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A“bricks-and-mortar”structured graphene oxide/polyvinyl alcohol coating:Enhanced water interfacial lubrication and durability

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Friction 2024年第12期12卷 2657-2678页

作者： Hanglin LI Lin DING Jingchun ZHANG Zhaoyang GUO Yazhuo SHANG Honglai LIU Xiangqiong ZENG Jiusheng LI Key laboratory for advanced materials School of Chemistry&Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China laboratory for advanced lubricating materials Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China School of materials and Chemistry University of Shanghai for Science and TechnologyShanghai 200093China

Coatings serve as ideal protective films for mechanical systems,providing dependable as well as efficient lubrication because of their unique structure along with outstanding tribological *** by the“bricks-and-mortar”structure,we prepared layered graphene oxide(GO)composite finishes strengthened with polyvinyl alcohol(PVA)and *** study demonstrates that the tribological properties of the GO-based coating on 304 stainless steel(SS304)are potentially greatly affected through PVA,GO,and *** optimizing the composition,we achieved the PVA_(40 wt%)/GO_(0.01 wt%)/borax composite coating,which exhibited the lowest average coefficient of friction(COF)of 0.021±0.003(a 97.86%reduction compared to control SS304)with minimal wear and abrasion even in a water *** found that the enhanced mechanical characteristics as well as elastic recovery within the coating were attributed to the hydrogen bonds and cross-linking between PVA and borax,which led to stress *** friction was further aided by the formation of a hydrated layer at the friction *** a result,the coating demonstrated remarkable durability,maintaining a low COF during long sliding distances(576 m,28,800 cycles,significantly longer than previously reported)without breaking.

关键词： graphene oxide coating water lubrication anti-wear properties durability

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Water lubrication of graphene oxide-based materials

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Friction 2022年第7期10卷 977-1004页

作者： Shaoqing XUE Hanglin LI Yumei GUO Baohua ZHANG Jiusheng LI Xiangqiong ZENG laboratory for advanced lubricating materials Shanghai Advanced Research InstituteChinese Academy of SciencesUniversity of Chinese Academy of SciencesShanghai 201210China School of Environmental and Chemical Engineering Shanghai UniversityShanghai 200444China Key laboratory for advanced materials School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

Water is as an economic,eco-friendly,and efficient lubricant that has gained widespread attention for *** graphene oxide(GO)-based materials can improve the lubricant efficacy of water lubrication due to their outstanding mechanical properties,water dispersibility,and broad application *** this review,we offer a brief introduction about the background of water lubrication and ***,the synthesis,structure,and lubrication theory of GO are *** attention is focused on the relationship between pH,concentration,and lubrication efficacy when discussing the tribology behaviors of pristine *** compounding or reacting GO with various modifiers,amounts of GO-composites are synthesized and applied as lubricant additives or into frictional pairs for different usage *** various strategies of GO-composite generate interesting effects on the tribology *** application cases of GO-based materials are described in water lubrication,including metal processing and *** advantages and drawbacks of GO-composites are then *** development of GO-based materials for water lubrication is described including some challenges.

关键词： tribology water lubrication graphene oxide(GO)

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Formulation of lyotropic liquid crystal emulsion based on natural sucrose ester and its tribological behavior as novel lubricant

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Friction 2022年第11期10卷 1879-1892页

作者： Yumei GUO Jiusheng LI Xiaojie ZHOU Yuzhao TANG Xiangqiong ZENG laboratory for advanced lubricating materials Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China National Facility for Protein Science in Shanghai Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China

The tribological behavior of oil-in-water emulsions formulated with natural lyotropic liquid crystal(LLC)emulsifiers based on natural sucrose ester was studied for the first *** optical microscopy,synchrotron radiation small-angle X-ray scattering,wide-angle X-ray scattering,and synchrotron radiation infrared microspectroscopy demonstrated that LLC emulsifiers were tightly ordered at the oil–water interface with a distinct nematic *** viscosity of emulsion was observed to change over ***,the zeta potential and laser particle size distribution verified the emulsion’s satisfactory *** frictional shearing test proved that the coefficient of friction of the emulsion versus pure oil decreased by 34.2%.The coefficient of friction of the emulsion with liquid crystal decreased 10.1%versus that without liquid *** liquid crystal emulsion did not exhibit outstanding anti-wear performance compared with pure oil,its wear volume was 29.4%less than the emulsion without liquid crystal.X-ray photoelectron spectroscopy and scanning electron microscope–energy dispersive X-ray spectroscopy(SEM–EDS)proved that the tribo-film of the emulsion with liquid crystal was formed synergistically by the liquid crystal phase with the base *** formulation affecting the lubricant quality was further studied by orthogonal *** resulting Stribeck curve behavior suggested that proper composition with a slightly higher viscosity can better reduce friction in both boundary lubrication and mixed lubrication *** lubrication mechanism indicated that the periodically ordered liquid crystal was transported to the sliding asperity in the form of emulsion droplets,which bored the pressure and released the oil to form a *** LLC emulsion is environmentally friendly and potentially non-irritant to the ***,it has promising application prospects as novel water-based and biological lubricants.

关键词： lyotropic liquid crystal(LLC) emulsion aqueous lubrication tribological behavior

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Lignin composite ionic liquid lubricants with excellent anti-corrosion,anti-oxidation,and tribological properties

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Friction 2023年第7期11卷 1239-1252页

作者： Chaoyang ZHANG Zhiquan YANG Qing HUANG Xingwei WANG Wufang YANG Chunyu ZHOU Bo YU Qiangliang YU Meirong CAI Feng ZHOU State Key laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China PetroChina Lanzhou lubricating Oil R&D Institute Lanzhou 730060China Shandong laboratory of Yantai advanced materials and Green Manufacturing Yantai 264006China Yantai Zhongke Research Institute of advanced materials and Green Chemical Engineering Yantai 264006China

A new type of lubricating material(BTA-P_(4444)-Lig)was synthesized by combining lignin with tetrabutylphosphorus and *** tribological properties,corrosion resistance,and anti-oxidation properties of BTA-P_(4444)-Lig as a lubricant were *** lubricating material exhibits excellent friction reduction and wear resistance,as well as good thermal stability and excellent oxidation *** analysis reveals that the active elements N and P in the lubricating material react with the metal substrate,and the reaction film effectively blocks direct contact between the friction pairs,affording excellent friction reduction and wear *** the same time,the phenolic hydroxyl group in lignin reacts with oxygen free radicals to form a resonance-stable semi-quinone free radical,which interrupts the chain reaction and affords good anti-oxidant activity.

关键词： lignin lubrication ionic liquid anti-oxidant

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Dopamine hydrochloride and carboxymethyl chitosan coatings for multifilament surgical suture and their influence on friction during sliding contact with skin substitute

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Friction 2020年第1期8卷 58-69页

作者： Gangqiang ZHANG Ganlin ZHENG Tianhui REN Xiangqiong ZENG Emile van der HEIDE advanced lubricating materials laboratory Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China Institute of Functional Textiles and advanced materials Colloge of Textlies&ClothingQingdao UniversityQingdao 266000China School of Chemistry and Chemical Engineering Key Laboratory of Thin Film and Microfabrication Technology(Ministry of Education)Shanghai Jiao Tong UniversityShanghai 200240China laboratory for Surface Technology and Tribology University of TwenteEnschede 7500AEThe Netherlands TU Delft Faculty of Civil Engineering and GeosciencesStevinweg 1Delft 2628 CNThe Netherlands Soete laboratory Ghent UniversityZwijnaarde B-9052Belgiu

In order to reduce the damage to tissue and fill the interstices between fibers,multifilament sutures are frequently treated with certain coating *** objective of this study was to create and characterize dopamine hydrochloride(DA)and carboxymethyl chitosan(CMCS)coatings on surgical sutures and investigate their effects on the frictional performance of the surgical sutures during sliding through a skin *** effects of the treatment on the physical and chemical characteristics of the surgical sutures were *** friction force of the surgical sutures during sliding through the skin substitute was experimentally determined using a penetration friction *** coefficient of friction(COF)was calculated using a linear elastic model and was used to estimate the frictional behavior of the surgical suture‐skin *** results showed that the DA coating could evenly deposit on the surface of the etched multifilament surgical suture surfaces in a weakly alkaline buffer *** CMCS coating material could form a uniform film on the surface of the *** changes in the surface roughness of the multifilament surgical sutures with different treatments occurred in this *** friction force and the COF of the multifilament surgical sutures with DA and CMCS coating showed little change when compared with untreated multifilament surgical sutures.

关键词： friction surgical suture coating Biomaterials skin substitute

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Effects of Electropulsing Cutting on the Quenched and Tempered 45 Steel Rods

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Journal of Wuhan University of Technology(materials Science) 2018年第1期33卷 204-211页

作者：陈龙 WANG Haibo LIU Dan YE Xiaoxin LI Xiaohui 唐国翌 School of materials Science and Engineering Tsinghua University advanced materials Institute Graduate School at Shenzhen Tsinghua University Key laboratory for advanced materials of Ministry of Education Department of Materials Science and Engineering Tsinghua University

Electropulsing is introduced into the cutting process for quenched and tempered 45 steel, which is a novel method to improve the material machinability compared with the conventional cutting process. The effects of electropulsing on cutting performances, microstructure evolution, and surface qualities of 45 steel rods were studied. The results indicate that electropulsing is beneficial for the cutting process in 3 aspects as follows：（1） reducing the principal cutting force, surface microhardness and surface roughness of the machined sample dramatically;（2） improving the machining efficiency and prolonging the life of cutting tools;（3） decreasing the thickness of rheological layer which was usually caused by work hardening in the cutting process. The morphology and microstructure of the cutting chips showed that the length of the chips increased significantly with the increase of the current density. The advantage of electropulsing is that it can improve the plastic deformation capability as well as increase the lubricating property between the specimen and the cutting tool.

关键词： electropulsing cutting process surface roughness plastic deformation lubricating property

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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

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Adsorption limitation investigation on olefins for Cu–BTC

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Friction 2024年第4期12卷 606-617页

作者： Xiao YANG Yunbo WANG Weihua CAO Ruizheng JIANG Guoxin XIE Yuying CAO Xiaowen QI School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Key laboratory of Self-lubricating Spherical Plain Bearing Technology of Hebei Province Yanshan UniversityQinhuangdao 066004China State Key laboratory of Tribology in advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Aviation Key laboratory of Science and Technology on Generic Technology of Self-lubricating Spherical Plain Bearing Yanshan UniversityQinhuangdao 066004China

To utilize Cu-benzene-1,3,5-tricarboxylate(Cu-BTC)adsorbed lubricant oils in the self-lubricating field,the adsorption properties of Cu-BTC on different 1-olefins must be *** this work,1-hexene,1-octene,1-nonene,1-decene,1-undecene,and 1-dodecene were studied by the Monte Carlo method and *** adsorption limit of Cu-BTC for n-olefins was determined as 1-undecene by the adsorption *** suggested a limit for even straight-chain molecules to the adsorption of *** maximum ratio of the olefin length of the largest pore diameter(L/D)of Cu-BTC was approximately ***,theoretical calculations(radial distribution function(RDF))and experiments(infrared(IR)spectra)confirmed the interaction of n-olefin adsorbates and the Cu-BTC framework occurred between the-CH=of olefins and the Cu and O atoms of the Cu-BTC *** work adds to the understanding and investigation of the adsorption of liquid lubricants using Cu-BTC as a metal-organic framework(MOF).

关键词： metal-organic framework(MOF) Cu-benzene-1,3,5-tricarboxylate(Cu-BTC) Monte Carlo method adsorption properties 1-olefins

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