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Stable graphene oxide-based lyotropic liquid crystals for interfacial lubrication

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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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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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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新时代文化传承视域下中部地区高校图书馆古籍保护与利用

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高校图书馆工作 2024年第1期44卷 70-78页

作者：曾湘琼吴溪蒋宇婷湘潭大学图书馆湘潭411105 湘潭大学公共管理学院湘潭411105

文章结合文献调研法与网络调研法,归纳总结古籍保护利用的调研要素,基于此,对中部地区高校图书馆古籍存藏情况以及古籍开放利用、推广活动、整理修复等现状进行调研,分析其古籍保护利用的特点及存在的问题。从推进新时代古籍工作深化发... 详细信息

文章结合文献调研法与网络调研法,归纳总结古籍保护利用的调研要素,基于此,对中部地区高校图书馆古籍存藏情况以及古籍开放利用、推广活动、整理修复等现状进行调研,分析其古籍保护利用的特点及存在的问题。从推进新时代古籍工作深化发展和支持新时代文化传承的角度出发,提出6点策略:贡献中部力量促推古籍保护立法;协同创建古籍研究中心;加强古籍专业人才队伍建设;推动古籍整理出版与数字化建设;推进古籍资源植入“四新”学科建设;打造“图书馆+”“古籍+”复合推广传承模式。

关键词：中部地区高校图书馆古籍保护古籍利用

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Tribological behavior of nanocarbon materials with different dimensions in aqueous systems

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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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Influence of surgical suture properties on the tribological interactions with artificial skin by a capstan experiment approach

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Friction 2017年第1期5卷 87-98页

作者： Tianhui REN xiangqiong zeng Emile VAN DER HEIDE School of Chemistry and Chemical Engineering Key Laboratory for Thin Film and Microfabrication of the Ministry of Education Shanghai Jiao Tong University Shanghai 200240 China Advanced Lubricating Materials Laboratory Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 ChinaLaboratory for Surface Technology and Tribology University of Twente Enschede 7500AE the Netherlands Laboratory for Surface Technology and Tribology University of Twente Enschede 7500AE the NetherlandsTU Delft Faculty of Civil Engineering and Geosciences Stevinweg 1 Delft 2628 CN the Netherlands

Tribological interactions between surgical suture and human tissue play an important role in the stitching process. The purpose of the paper is to understanding the tribological behavior of surgical suture interacting with artificial skin, with respect to surgical suture material and structure, by means of a capstan experiment approach and a contact area model. The results indicated that structure and surface topography of the surgical suture had a pronounced effect on the tribological interactions. The apparent coefficient of friction of vicryl surgical suture was the smallest among the three surgical suture materials. As the sliding velocity increased, or the applied load decreased, the coefficient of friction increased. Furthermore, stick-slip phenomena were observed during the sliding procedure.

关键词： friction sliding surgical suture artificial skin capstan experiment

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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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Tribological performance and chemistry of films for di-n-butyl dithiocarbamate derivatives in rapeseed oil

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Chinese Science Bulletin 2007年第2期52卷 194-199页

作者： WU Hua zeng xiangqiong LU LingBo REN TianHui School of Chemistry and Chemical Engineering Shanghai Jiaotong University Shanghai China

Two di-n-butyl dithiocarbamate derivatives were easily synthesized. Their tribological performances as lubricating oil additives in rapeseed oil were evaluated using a four-ball machine, and their chemistry of films was analyzed with X-ray absorption near-edge spectroscopy (XANES). The results indicate that the two compounds possess excellent anti-wear property and good load-carrying capacity. According to the XANES results, for the thermal films, the outer surfaces are mainly composed of N, S-containing polymer and ferric sulfate, and the near-surface and the bulk are composed of ferrous sulfate, while for the anti-wear films, the outer surfaces are only composed of ferric sulfate, but the near-surface and the bulk are mainly composed of ferrous sulfate.

关键词：摩擦学薄膜化学属性衍生物二硫代氨基甲酸酯

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XANES analysis of tribo-chemical and thermal films generating from some organic polysulfides

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Chinese Science Bulletin 2006年第22期51卷 2710-2716页

作者： YI Hongling zeng xiangqiong CAO Yan RENTianhui M. Kasrai G. M. Bancroft School of Chemistry and Chemical Engineering Shanghai Jiaotong University Shanghai 200240 China Department of Chemistry University of Western Ontario LondonOntario N6A5B7 Canada

X 光检查吸收近的边结构(XANES ) 光谱学第一被用来描绘从烷基，本甲基和包含酰的器官的 polysulfides 产生的 triboehemical 和热电影的化学性质。从这些 polysulfides 产生的热电影主要由 FeSO4l 和烷基化二硫组成，这被发现了也存在... 详细信息

X 光检查吸收近的边结构(XANES ) 光谱学第一被用来描绘从烷基，本甲基和包含酰的器官的 polysulfides 产生的 triboehemical 和热电影的化学性质。从这些 polysulfides 产生的热电影主要由 FeSO4l 和烷基化二硫组成，这被发现了也存在在表面下并且从包含酰的 polysulfides 产生的热电影的体积。Undertriboehemical 条件，电影的作文依赖于添加剂的分子结构。也就是，从烷基 polysulfide 产生的 triboehemical 电影由烷基化二硫组成在外面表面， FeSO_4 的混合物， FeS_2 和亚在表面下，并且 FeSO_4in 体积；为本甲基 polysulfide 的 triboehemical 电影的作文由 FeSO4 组成在外面，出现作文在表面下并且体积与烷基 *** 一样是包含酰的 polysulfides， triboehemical 电影由烷基化二硫组成在外面表面，和 FeS_2 在表面下并且体积。

关键词：有机聚硫化物 XANES 薄膜学 X射线吸收

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Comparative Study on Different Methods for Prediction of Thermal Insulation Performance of Thermal Barrier Coating Used on Turbine Blades

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Journal of Thermal Science 2024年第1期33卷 172-189页

作者： ZHANG Zhixin zeng Wu ZHANG Xiaodong zeng Yuntao Advanced Gas Turbine Laboratory Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Advanced Energy and Power Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China Innovation Academy for Light-duty Gas Turbine Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

As turbine inlet temperature gets higher and higher,thermal barrier coating(TBC) is more and more widely used in turbine *** turbine blades with TBC,it is of great significance to evaluate the temperature distribution of its substrate metal quickly and accurately,especially during the design *** different degrees of simplification such as whether to consider the change of the geometric size of the fluid domain by TBC and whether to consider the planar heat conduction in TBC,three different methods used in conjugate heat transfer(CHT) simulation to model the TBC of the turbine blades have been developed and widely used by ***,little research has been conducted to investigate the influence of the three methods on the temperature distribution of turbine *** fill this gap,three geometric models were *** are a solid conduction model with a substrate metal layer and a TBC layer,a transonic turbine vane with internal cooling and TBC,and a plate cylindrical film hole cooling model with *** methods were used in these geometric models and their differences were carefully analyzed and *** result shows that for the conduction model used in this paper,with the same TBC surface temperature distribution,the difference between the three methods is very small and can be *** a transonic turbine vane with internal cooling,regarding the local maximum temperature of the substrate-TBC interface,the largest difference between the method in which TBC is considered as a thermal resistance or a virtual layer of cells and the method in which three-dimensional heat conduction equation of TBC is solved occurs at the trailing *** difference near the leading edge is below *** employed to the film cooling model,the difference of the laterally averaged temperature of the substrate-TBC interface can be 8 K which is mainly due to the change of the length to diameter ratio of the film cooling hole by *** the substrate

关键词： turbine blade thermal barrier coating conjugate heat transfer film cooling hole

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