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Friction 2020年第6期8卷 1025-1038页

作者： Ruochong ZHANG Xuqing LIU Zhiguang GUO meirong cai Lei SHI State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China School of Materials University of ManchesterOxford RoadManchester M139PLUK Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Key Laboratory for the Green Preparation and Application of Functional Materials(Ministry of Education) Hubei UniversityWuhan 430062China

In this study,the gelling ability and lubrication performance of N-octadecyl-D-gluconamides(NOG)in liquid paraffin(LP),pentaerythritol oleate(PE-OA),and polyethylene glycol(PEG)oils were systemically *** NOG,which could gelate the investigated oils,was successfully synthesized by a one-step *** prepared gel lubricants were completely thermoreversible and exhibited improved thermal stability,according to the thermogravimetry analysis(TGA)*** tests confirmed that the NOG gelator could effectively regulate the rheological behavior of the base *** evaluation suggested that NOG,as an additive in the three types of base oils,could remarkably reduce the friction and wear in steel contacts.A plausible mechanism for the improved performances was proposed based on the mechanical strength of the gels and the formation of the boundary-lubricating film on the worn *** results indicated that NOG is a potential gelator for preparing gel lubricants with excellent tribological properties and environment-friendly characteristics.

关键词： gel lubricant supermolecular assembly rheological property tribological performance lubricating mechanism

Lubricating a bright future:Lubrication contribution to energy saving and low carbon emission

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Science China(Technological Sciences) 2013年第12期56卷 2888-2913页

作者： cai meirong GUO RuiSheng ZHOU Feng LIU WeiMin State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences

Both the academic society and the industry are hunting for new energy forms for the ***,the world should not forget the conventional technologies that contribute to the sustainable society by technical *** them,lubrication plays a significant role in energy saving and in low CO2emission by increasing the fuel efficiency and by prolonging the service life of *** the advance of novel synthetic approaches,and nanoscience and technologies,novel lubrication oils and additives and their formulations are being developed to reduce friction and wear,and novel surface treatment routes and surface coatings are invented and provide more efficient *** technologies create tremendous chances for machines to work more efficiently with low energy *** we review the recent progresses and challenges associated with some novel lubrication techniques that include novel surface treatment(such as texturing,high-performance nanocomposite coatings,adapting coating),tribology design(solid and liquid lubrication),energy-conserving engine oil and novel lubricants and formula(such as ionic liquids,low S,P content additives)which are to be adopted to enhance the fuel efficiency to achieve energy saving and low carbon *** is increased demand to replace fossil lubricants by degradable green *** designed coatings can reduce drag significantly during navigation of both airplanes and *** these aspects will be also reviewed in the paper.

关键词： energy saving low carbon emission lubricant additives coating drag reduction

Physicochemistry aspects on frictional interfaces

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Friction 2017年第4期5卷 361-382页

作者： meirong cai Qiangliang YU Feng ZHOU Weimin LIU State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Friction exists wherever relative motion occurs and is the main source of energy *** plays a significant role in improving fuel efficiency,reducing emissions,and prolonging the service life of *** interactions between two moving solid surfaces or the flow of a fluid (and/or environment) on a solid surface are the primary causes of *** from the mechanical design of moving parts,surface physicochemistry is of crucial importance to *** review deals with the frontier research on controlling friction and lubrication,highlights the importance of physicochemistry aspects,and enumerates the state-of-the-art chemistry solutions to tribological *** aims at inspiring talented young scientists from different fields to make significant contributions to the area.

关键词： physicochemistry friction interfaces surface adsorption tribochemistry

Oil-soluble ionic liquids as antiwear and extreme pressure additives in poly-α-olefin for steel/steel contacts

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Friction 2019年第1期7卷 18-31页

作者： Guowei HUANG Qiangliang YU Zhengfeng MA meirong cai Feng ZHOU Weimin LIU State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

To enhance the lubricating and extreme pressure(EP) performance of base oils, two types of oil-soluble ionic liquids(ILs) with similar anion albeit dissimilar cations were synthesized. The physical properties of the prepared ILs were measured. The anticorrosion properties of ILs were assessed by conducting corrosion tests on steel discs and copper strips, which revealed the remarkable anticorrosion properties of the ILs in comparison with those of the commercial additive zinc dialkyldithiophosphate(ZDDP). The tribological properties of the two ILs as additives for poly-α-olefin-10(PAO10) with various mass concentrations were investigated. The tribological test results indicate that these ILs as additives are capable of reducing friction and wear of sliding contacts remarkably as well as enhance the EP performance of blank PAO10. Under similar test conditions, these IL additives exhibit higher lubricating and anti-wear(AW) performances than those of ZDDP based additive package in PAO10. Subsequently, X-ray photoelectron spectroscopy(XPS) and energy dispersive spectrometer(EDS) were conducted to study the lubricating mechanism of the two ILs. The results indicate that the formation of tribochemical film plays the most crucial role in enhancing the lubricating and AW behavior of the mixture lubricants.

关键词： anti-wear extreme pressure ionic liquids lubricating mechanism

Fluorinated graphene quantum dots with long-term lubrication for visual drug loading and joint inflammation therapy

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Friction 2023年第12期11卷 2204-2220页

作者： Peiwei GONG Changmin QI Dandan WANG Mianran CHAO Jianxi LIU meirong cai Weimin LIU Key Laboratory of Catalytic Conversion and Clean Energy in Universities of Shandong Province School of Chemistry and Chemical EngineeringQufu Normal UniversityJining 273165China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Osteoarthritis(OA)treatment mainly relies on developing new drugs or nanocarriers,while little attention is paid to building novel remedial mode and improving drug loading *** work reports an integrated nanosystem that not only realizes visual drug loading and release,but also achieves enhanced lubrication and effective joint inflammation therapy based on fluorinated graphene quantum dots(FGQDs).Oxygen introduction promotes FGQDs outstanding water-stability for months,and layered nano-sized structure further guarantees excellent lubricating properties in biomimetic synovial *** special design of chemistry and structure endows FGQDs robust fluorescence in a wide range of pH ***,the excitation spectrum of FGQDs well overlaps the absorption spectrum of drugs,which further constructs a new concept of internal filtering system to visually monitor drug loading by naked *** importantly,extraordinary long-term lubrication performance is reported,which is the first experimental demonstration of concentration-dependent mutations of coefficient of friction(COF).Cell incubation experiments indicate that drug-loaded FGQDs have good biocompatibility,tracking property of cellular uptake and drug release,which show efficient anti-inflammation potential for H2O2-induced chondrocyte degradation by up-regulated cartilage anabolic *** study establishes a promising OA treatment strategy that enables to monitor drug loading and release,to enhance long-time lubricating property,and to show effective anti-inflammatory potential for cartilage protection.

关键词： fluorinated graphene(FG) structure design lubrication fluorescence drug delivery

Constructing a biomimetic robust bi-layered hydrophilic lubrication coating on surface of silicone elastomer

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Friction 2022年第7期10卷 1046-1060页

作者： Luyao GAO Xiaoduo ZHAO Shuanhong MA Zhengfeng MA meirong cai Yong-Min LIANG Feng ZHOU School of Chemistry and Chemical Engineering Lanzhou UniversityLanzhou 730000China Lanzhou Institute of Chemical Physics Chinese Academy of SciencesLanzhou 730000China

Silicone elastomers-based materials have been extensively involved in the field of biomedical devices,while their use is extremely restricted due to the poor surface lubricity and inherent *** paper describes a novel strategy for generating a robust layered soft matter lubrication coating on the surface of the polydimethylsiloxane(PDMS)silicone elastomer,by entangling thick polyzwitterionic polyelectrolyte brush of poly(sulfobetaine methacrylate)(PSBMA)into the sub-surface of the initiator-embedded stiff hydrogel coating layer of P(AAm-co-AA-co-HEMA-Br)/Fe,to achieve a unified low friction and high load-bearing ***,the stiff hydrogel layer with controllable thickness is covalently anchored on the surface of PDMS by adding iron powder to provide catalytic sites through surface catalytically initiated radical polymerization(SCIRP)method and provides high load-bearing capacity,while the topmost brush/hydrogel composite layer is highly effective for aqueous *** synergy effects are capable of attaining low friction coefficient(COFs)under wide range of loaded condition in water environment with steel ball as sliding ***,the influence of mechanical modulus of the stiff hydrogel layer on the lubrication performance of layered coating is investigated,for which the COF is the lowest only when the modulus of the stiff hydrogel layer well matches the PDMS ***,the COF of the modified PDMS could remain low friction(COF<0.05)stably after encountering 50,000 sliding cycles under 10 N ***,the surface wear characterizations prove the robustness of the layered lubricating *** work provides a new route for engineering lubricious silicon elastomer with low friction,high load-bearing capacity,and considerable durability.

关键词： surface modification silicone elastomer layered lubrication coating hydrogels polyzwitterionic brush

Interfacial mechanism of hydrogel with controllable thickness for stable drag reduction

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Friction 2024年第2期12卷 231-244页

作者： Xiaotong WU Ying LIU Yunlei ZHANG Xingwei WANG Wufang YANG Lang JIANG Shuanhong MA meirong cai Feng ZHOU School of Advanced Manufacturing Nanchang UniversityNanchang 330031China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering Shandong Laboratory of Yantai Advanced Materials and Green ManufactureYantai 264006China

Surface wettability plays a significant role in reducing solid–liquid frictional resistance,especially the superhydrophilic/hydrophilic interface because of its excellent thermodynamic *** this work,poly(acrylic acid)-poly(acrylamide)(PAA–PAM)hydrogel coatings with different thicknesses were prepared in situ by polydopamine(PDA)-UV assisted surface catalytically initiated radical *** drag reduction performance of hydrogel surface was measured using a rotational rheometer by the plate–plate *** experimental results showed that the average drag reduction of hydrogel surface could reach up to about 56%in Couette flow,which was mainly due to the interfacial polymerization phenomenon that enhanced the ability of hydration layer to delay the momentum dissipation between fluid layers and the diffusion behavior of *** proposed drag reduction mechanism of hydrogel surface was expected to shed new light on hydrogel–liquid interface interaction and provide a new way for the development of steady-state drag reduction methods.

关键词： steady state drag reduction hydrogel interface hydration hydrophilic

Tribochemical synthesis of functionalized covalent organic frameworks for anti-wear and friction reduction

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Friction 2023年第10期11卷 1804-1814页

作者： Xiaozhi ZHANG Qi LU Yaojie YAN Tingting ZHANG Shujuan LIU meirong cai Qian YE Feng ZHOU Weimin LIU State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Tribochemistry can be defined as a field dealing with the chemical reactions occurring in the friction zone,capable of catalyzing mechanical and physico-chemical changes in the friction contact area,facilitating the formation of tribo-films,which is also an efficient approach to fabricate novel innovative *** this paper,we report the successful synthesis of the silicon oil(SO)-functionalized covalent organic frameworks(COFs)prepared via the tribochemical method when subjected to the reciprocating friction;during the friction process,the rich aldehyde-terminated COFs can bond with amino SO via the Schiff base reaction between aldehyde group and amino group to obtain the desired functionalized COFs(SO@COF-LZU1).The tribochemical reaction progress was tracked through in-situ monitoring of the friction coefficient and the operating conditions during the entire friction ***,the friction coefficient continued to decrease until it finally stabilized as the reaction progressed,which revealed the formation of a protective ***,an approximate tribochemical model was presented,wherein the reaction mechanism was investigated and analyzed by employing structural analysis techniques like magic angle spinning nuclear magnetic resonance(MAS NMR),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS).Furthermore,the tribochemical-induced SO@COF-LZU1 exhibited remarkable tribological performance with a low friction coefficient of 0.1 and 95.5%reduction in wear volume when used as additives of 500SN base *** prime focus of our research was on the preparation and functionalization of COF materials via tribochemical reactions,unraveling a new avenue for the rational design and preparation of functional materials.

关键词： tribochemical reaction covalent organic frameworks(COFs) silicon oil(SO)functionalization lubricant additives tribological properties

Progress in MXene-based materials for microwave absorption

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Journal of Materials Science & Technology 2024年第13期180卷 207-225页

作者： Xingwei Wang Chen Zhao Chuanpeng Li Yu Liu Shuang Sun Qiangliang Yu Bo Yu meirong cai Feng Zhou State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai 264000China

Due to the rapid development of radar technology,the demand for absorbing stealth materials is increas-ing,and ultra-broadband absorption(effective absorption bandwidth>8 GHz)has become an inevitable *** a new type of two-dimensional material,MXene material possesses the characteristics of excellent wave absorbing material due to its easy preparation,easy modulation of defects and sur-face functional groups,and high *** work summarizes the absorbing theory and research progress on MXene-based absorbing materials in recent years,including pure MXene absorbing materials and MXene-based magnetic or dielectric composite materials with multiple *** shortcomings and research directions of MXene-based materials were pointed ***,research on MXene-based absorbent materials is thriving and in a state of vigorous *** absorbent materials have been reported,but their shortcomings are also *** factors that affect the performance of MXene-based absorbent materials are complex,and the absorption mechanism is relatively *** systematic and detailed research is needed to clarify these influencing mechanisms,broaden the absorption bandwidth,and reduce the matching thickness to meet practical usage requirements in the future.

关键词： Microwave absorption materials MXene Impedance matching Dielectric loss Magnetic loss Attenuation

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