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Nickel phosphorous trisulfide:A ternary 2D material with an ultra-low coefficient of friction

Friction 2024年第10期12卷 2313-2324,F0004页

作者： Haoyu DENG Tongtong YU Changhe DU Ruilin SHEN Yongkang ZHAO Xinjian HE yange feng Liqiang ZHANG Daoai WANG 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 Qingdao Center of Resource Chemistry and New Materials Qingdao 266100China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 265503China

Ultra-low friction is crucial for the anti-friction,anti-wear,and long-life operation of ***,very few two-dimensional materials can achieve ultra-low friction,and they have some limitations in their ***,exploring novel materials with ultra-low friction properties is greatly *** emergence of ternary two-dimensional materials has opened new opportunities for nanoscale ultra-low *** study introduced nickel phosphorous trisulfide(NiPS3,referred to as NPS),a novel two-dimensional ternary material capable of achieving ultralow friction in a vacuum,into the large nanotribology ***-size and high-quality NPS crystals with up to 14 mm×6 mm×0.3 mm dimensions were grown using the chemical vapor transport *** NPS nanosheets were obtained using mechanical *** dependence of the NPS nanotribology on layer,velocity,and angle was systematically investigated using lateral force ***,the coefficient of friction(COF)of NPS with multilayers was decreased to about 0.0045 under 0.005 Pa vacuum condition(with load up to 767.8 nN),achieving the ultra-low friction *** analysis of the frictional dissipation energy and adhesive forces showed that NPS with multilayers had minimum frictional dissipation energy and adhesive forces since the interlayer interactions were weak and the meniscus force was excluded under vacuum *** study on the nanoscale friction of a ternary two-dimensional material lays a foundation for exploring the nanoscale friction and friction origin of other two-dimensional materials in the future.

关键词： two-dimensional(2D)materials NiPS3 ultra-low friction nanotribology

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A triboelectric/electromagnetic hybrid generator for efficient wind energy collection and power supply for electronic devices

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Science China(Technological Sciences) 2021年第9期64卷 2003-2011页

作者： XU GuanPing ZHENG YouBin feng yange MA ShaoChen LUO Ning feng Min CHEN ShouGang WANG DaoAi State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China Qingdao Center of Resource Chemistry and New Materials Qingdao 266100China

Harvesting energy from ambient environment has been considered as a promising strategy for driving portable electronic devices in a sustainable way. A wind driven triboelectric-electromagnetic hybrid nanogenerator has been fabricated to convert wind energy into electricity. It is composed of an electromagnetic generator(EMG) and a triboelectric nanogenerator(TENG) with the output power of 35 and 0.32 mW, respectively when the wind speed is 5 m/s. Generally, TENG shows a low current output with a high voltage output characteristic, on the contrary the EMG shows a high current output and a low voltage output. This hybrid nanogenerator overcomes these problems and exhibits comprehensive and efficient performance on scavenging ***, in view of the output performance and charging ability of the hybrid nanogenerator, it shows high stability, making it suitable for charging capacitors or batteries and driving portable electronics sustainably. A new structure of integrated TENG and EMG was designed to harvest wind energy, which shows potential applications in portable and small device power supply system, especially in the areas of remote mountains, deserts, islands, etc., as emergency power supply.

关键词： TENG electromagnetic generator wind energy self-powered selective power supply

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New starch capsules with antistatic,anti-wear and superlubricity properties

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Frontiers of Materials Science 2021年第2期15卷 266-279页

作者： Nannan WANG Youbin ZHENG yange feng Liqiang ZHANG Min feng Xiaojuan LI Daoai WANG State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Sciences and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China Qingdao Center of Resource Chemistry and New Materials Qingdao 266100China

Adsorption of drug powder is caused by triboelectrification on the surface of starch capsule during filling ***,high wear rate and poor water lubricity also hinder the further practical applications of traditional starch *** solve these problems,a glycerol-modified starch capsule with perfect anti-triboelec-trification and enhanced lubrication performance was *** bond between glycerol and starch molecules could reduce the bound water content on the capsule surface and thus realizes *** adding glycerol,a three-tier structure composed of starch-glycerol-water is formed through hydrogen bonding on the surface of the starch film,which has been proven to be favorable for lubrication *** 5% glycerol is added,the short-circuit current(I_(sc))of starch-based triboelectric nanogenerator(TENG)is reduced by 86%,and the wear volume of the starch film is reduced by 89%.Underwater lubrication condition,the lubrication performance of the starch-glycerol film can reach the super lubricated level with a friction coefficient of about *** work provides a new route to obtain modified starch capsules with improved anti-triboelectrification property,reduced wear rate and superlubricity property.

关键词： starch capsules hydrogen bonds anti-triboelectrification anti-wear superlubricity

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Achieving macroscale superlubricity with ultra-short running-in period by using polyethylene glycol-tannic acid complex green lubricant

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Friction 2023年第5期11卷 748-762页

作者： Changhe DU Tongtong YU Zishuai WU Liqiang ZHANG Ruilin SHEN Xiaojuan LI Min feng yange feng Daoai WANG 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 Qingdao Center of Resource Chemistry and New Materials Qingdao 266100China

Superlubricating materials can greatly reduce the energy consumed and economic losses by unnecessary ***,a long pre-running-in period is indispensable for achieving superlubricity;this leads to severe wear on the surface of friction pairs and has become one of the important factors in the wear of superlubricating *** this study,a polyethylene glycol-tannic acid complex green liquid lubricant(PEG10000-TA)was designed to achieve macroscale superlubricity with an ultrashort running-in period of 9 s under a contact pressure of up to 410 MPa,and the wear rate was only 1.19×10^(–8)mm^(3)·N^(−1)·m^(−1).This is the shortest running-in time required to achieve superlubricity in Si_(3)N_(4)/glass(SiO_(2)).The results show that the strong hydrogen bonds between PEG and TA molecules can significantly reduce the time required for the tribochemical reaction,allowing the lubricating material to reach the state of superlubrication ***,the strong hydrogen bond can share a large load while fixing free water molecules in the contact zone to reduce shear *** findings will help advance the use of liquid superlubricity technology in industrial and biomedical.

关键词： superlubricity running-in period tannic acid green lubricant friction

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Concealed Wireless Warning Sensor Based on Triboelectrification and Human-Plant Interactive Induction

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Research 2021年第1期2021卷 1508-1518页

作者： yange feng Enrico Benassi Liqiang Zhang Xiaojuan Li Daoai Wang feng Zhou Weimin Liu State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Qingdao Center of Resource Chemistry and New Materials Qingdao 266100China Public Technical Service Center Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Novosibirsk State University 1 Pirogova Str.Novosibirsk 630090Russia

With the continuous development of artificial intelligence,the demand for sensors with simple preparation and strong concealment continues to ***,most of the high-sensitivity sensors have complex manufacturing methods,high costs,and single *** this paper,a sensitive motion sensor based on the triboelectric interaction between a living plant and the human body was designed to detect the real-time movements of human beings and provide danger warning.A certain relationship exists between the triboelectric signal and the distance between the plant and the human body,with effective signals being detected in the range of 1.8 *** addition,the triboelectric signal generated by each person is unique like a fingerprint,which can be used for *** the basis of the triboelectric signal,a wireless character entry warning system is *** sensor can not only send out a wireless warning signal at a specific distance but also allow one to receive the warning information synchronously on a mobile phone in real *** wireless movement sensor receives signals through a living plant,and it has the characteristics of convenient use,strong concealment,and shielding *** sensor has the potential to be widely used in person recognition,danger warning,and motion monitoring.

关键词： warning convenient sensor

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钢-聚四氟乙烯摩擦界面的摩擦起电行为

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摩擦学学报 2021年第6期41卷 983-994页

作者：张立强冯雁歌李小娟王楠楠王道爱中国科学院兰州化学物理研究所固体润滑国家重点实验室甘肃兰州730000 中国科学院大学北京100049 青岛市资源化学与新材料研发中心山东青岛266100

作为界面摩擦中普遍存在的一种物理现象,摩擦起电由于其对摩擦界面的高度灵敏性而被广泛研究.以钢-聚四氟乙烯(PTFE)为研究对象,通过采集摩擦过程中的摩擦系数、钢球的接地电流以及PTFE的表面电势,对其摩擦界面的起电行为进行了详细研究... 详细信息

作为界面摩擦中普遍存在的一种物理现象,摩擦起电由于其对摩擦界面的高度灵敏性而被广泛研究.以钢-聚四氟乙烯(PTFE)为研究对象,通过采集摩擦过程中的摩擦系数、钢球的接地电流以及PTFE的表面电势,对其摩擦界面的起电行为进行了详细研究.三种信号的波动幅值呈正相关性,反映了摩擦-摩擦起电的内在联系.在钢-PTFE的摩擦过程中,材料的转移诱导使得PTFE的表面电势在达到饱和值后会反向演化.利用钢-PTFE摩擦副进入稳定摩擦阶段的时间与摩擦电势的反向演化时间的关联性设计钢-PTFE或其他金属-聚合物摩擦副的摩擦状态监测系统,对实现机械运动过程中的摩擦副运动原位监测和故障预警具有重要价值.

关键词：钢-聚四氟乙烯摩擦起电表面电势电流极性反向演化摩擦监测

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纳米氧化铁调控钧瓷釉层显微结构及呈色分析

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硅酸盐通报 2024年第6期43卷 2279-2286页

作者：李旭朱聪旭法文君张艳鸽冯铭华郭志勇孔春生郑直许昌学院化工与材料学院(表面微纳米材料研究所) 许昌461000 许昌市产品质量检验检测与研究中心许昌461000 禹州市神后镇孔家钧窑有限公司禹州461670

本文在钧瓷釉中添加不同质量分数的纳米氧化铁,分析在还原气氛(96%Ar/4%H_(2))与氧化气氛(空气)烧制后钧瓷呈色及釉面显微结构的变化,采用分光测色计研究了颜色变化,利用X射线衍射仪、拉曼光谱仪研究了钧瓷物相成分,利用扫描电子显微镜... 详细信息

本文在钧瓷釉中添加不同质量分数的纳米氧化铁,分析在还原气氛(96%Ar/4%H_(2))与氧化气氛(空气)烧制后钧瓷呈色及釉面显微结构的变化,采用分光测色计研究了颜色变化,利用X射线衍射仪、拉曼光谱仪研究了钧瓷物相成分,利用扫描电子显微镜研究了釉层微观结构。结果表明:随着纳米氧化铁含量梯度增加,还原气氛下钧瓷试片从淡青色变为蓝色再变为青灰色,氧化气氛下从白色变为黄色再变为酱黑色。当釉层中纳米氧化铁含量达到3.0%(质量分数)时,釉面SiO_(2)晶相完全消失,呈非晶态。随着纳米氧化铁含量的增加,釉面呈液-液分相结构,还原气氛下显微结构尺寸从85 nm增加至150 nm,且Fe^(2+)相对含量上升。氧化气氛下,当釉面达到玻璃化后,分相结构尺寸从217 nm增加到307 nm。

关键词：钧瓷纳米氧化铁显微结构结构色釉层呈色分析

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关于公务员录用问题的法律思考——以西方发达国家为借鉴

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贺州学院学报 2010年第3期26卷 39-43页

作者：奉晓政陆严格贺州学院广西贺州542800 广西旅游投资集团有限公司广西南宁530022

公务员招考制度非常重要,关系到公务员的"入口"。我国公务员招考制度的确立经历了漫长的过程,公务员考录制度实施以来,取得了巨大成绩,但仍存在待完善之处。国外发达国家公务员考录制度不断发展,对我们有借鉴意义,以此为基础提出了完善... 详细信息

公务员招考制度非常重要,关系到公务员的"入口"。我国公务员招考制度的确立经历了漫长的过程,公务员考录制度实施以来,取得了巨大成绩,但仍存在待完善之处。国外发达国家公务员考录制度不断发展,对我们有借鉴意义,以此为基础提出了完善公务员招录制度的立法建议。

关键词：公务员录用制度借鉴

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我国项目管理标准体系构建研究

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中国质量与标准导报 2022年第5期 58-62页

作者：曾相戈张燕歌吴峰中国航空综合技术研究所国家海洋标准计量中心中国标准化协会

本文研究分析了国内外项目管理标准化最新发展情况,对我国项目管理标准化工作进行顶层设计,以期全面推进项目管理标准体系建设,不断提高我国项目管理标准化水平。

关键词：项目管理标准化标准体系

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杜仲橡胶的环氧化改性研究

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橡胶科技 2015年第7期13卷 13-18页

作者：龚兴宇王芳宫衍革杨凤广东科顺化工实业有限公司广东佛山528303 沈阳化工大学材料科学与工程学院辽宁沈阳110142

采用溶液法对杜仲橡胶(EUG)进行环氧化改性,考察反应条件对环氧化反应的影响,采用红外光谱法、核磁共振氢谱法和差示扫描量热法等研究环氧度(E)对环氧化EUG(EEUG)熔融-结晶行为的影响。结果表明:随着反应温度升高和甲酸用量增大,E逐渐增... 详细信息

采用溶液法对杜仲橡胶(EUG)进行环氧化改性,考察反应条件对环氧化反应的影响,采用红外光谱法、核磁共振氢谱法和差示扫描量热法等研究环氧度(E)对环氧化EUG(EEUG)熔融-结晶行为的影响。结果表明:随着反应温度升高和甲酸用量增大,E逐渐增大;反应温度为50℃,n(甲酸)︰n(碳-碳双键)︰n(双氧水)=0.8︰1︰1时,E较大,无明显的副反应;环氧化反应未改变橡胶分子链构型,EEUG的分子链仍然是反式-1,4结构;随着E增大,EEUG的结晶能力减弱,E为24.8%时EEUG完全失去结晶能力,宏观上由室温下的硬质塑料转变为弹性体。

关键词：杜仲橡胶环氧化改性环氧度结晶

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