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Electric field controlled superlubricity of fullerene-based host–guest assembly

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Nano Research 2023年第1期16卷 583-588页

作者： Shanchao Tan Hongyu Shi Xin Du Kunpeng Wang Haijun Xu Junhua Wan Ke Deng qingdao Zeng Yuhong Liu State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology(NCNST)Beijing 100190China College of Chemical Engineering Jiangsu Key Lab of Biomass-based Green Fuels and ChemicalsNanjing Forestry UniversityNanjing 210037China Key Laboratory of Organosilicon Chemistry and material technology of Ministry of Education Hangzhou Normal UniversityHangzhou 310012China Center of materials science and Optoelectonics Engineering University of Chinese Academy of SciencesBeijing 100049China

Controlling friction by the electric field is a promising way to improve the tribological performance of a variety of movable mechanical *** this work,the assembly structure and microscale superlubricity of a host–guest assembly are effectively controlled by the electric *** the help of the scanning tunneling microscopy(STM)technique,the host–guest assembly structures constructed by the co-assembly of fullerene derivative(Fluorene-C60)with macrocycles(4B2. and 3B2.)are explicitly *** with density functional theory(DFT),the distinct different assembly behaviors of fullerene derivatives are revealed at different probe biases,which is attributed to the molecular polarity of the fullerene *** the control on the adsorption behavior,the friction coefficient of host–guest assembly is demonstrated to be controllable in the electric field by using atomic force microscopy(AFM).At positive probe bias,the friction coefficient of the host–guest assembly is significantly reduced and achieves superlubricity(μmin=0.0049).The efforts not only help us gain insight into the host–guest assembly mechanism controlled by the electric field,but also promote the further application of fullerene in micro-electro-mechanical systems(MEMS).

关键词： superlubricity electric field friction control fullerene derivative host-guest assembly

Construction of Realistic Scene in Virtual Turning Based on Global Illumination Model and Chip Simulation

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厦门大学学报（自然科学版） 2002年第S1期41卷 46-页

作者： WANG Tai-yong 1, WANG Guo-feng 2. LI Hong-wei 1, LIN Jian-bo 1, WU Zhen-yong 1 (1. School of Mechanical Engineering, Tianjin university, Tianjin 300072. china 2. School of {2. science and Engineering, Tianjin university, Tianjin 300072. china)

With the rapid development of manufacturing technology, the traditional simulation of machining can not meet the people’s need. Research on virtual machining environment is one of the key parts of virtual manufacturing technology. According to the features of virtual turning, this paper proposes a simplified Whitted lighting model based on analysis of Phong and other local illumination model. This model takes the material and roughness of workpiece into account to calculate the roughness coefficient D, geometric fading coefficient G and Fresenel transmission coefficient F’ so that the light intensity in the scene can be got more realisticly. Moreover, to obtain the natural lighting effects, based on the analysis of motion space of machine tools, local ray tracing algorithm is given to calculate the light intensity of every position during the course of simulation. This method can not only simulate the machining environment accurately, but also reduce the calculating time greatly. For example, if CPU is 1.3 G and internal memory is 12. M, the refresh time using the original algorithm is 0.1 second, while it becomes 0.01 seconds by local refreshing. Besides, to get more realistic machining scene, the paper deduce the transfer matrix from chip coordinate to feeding coordinate so that the chip model can be integrated into the whole machining scene. At last, a example of virtual cutting scene is shown to demonstrate the effects of global illumination model and helical chip simulation. The system can give the user high true sensation. The user can operate the machine tools through the controlling panel and watch the cutting process from different viewing angle. The data needed for construction of scene and chip simulation is obtained form the C616 lathe. This study plays important role in richening virtual manufacturing theory and promoting the development of advanced manufacturing technology.

关键词： global illumination ray tracing Helical Chip virtual turning

Effects of Electroplated Coatings on Corrosion Behavior of Ti-102./30CrMnSiA Galvanic Couple

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Journal of Wuhan university of technology({2.s science) 2008年第5期23卷 704-707页

作者：刘建华史俊秀 School of material science and Engineering BeiHang University

Galvanic corrosion behavior of Ti-102. titanium alloy coupled 30CrMnSiA steel was investigated in 3.5% NaCl solution. Particular attention was given to the effect of three different electroplated coatings on corrosion behavior of the galvanic couple. Galvanic corrosion test was conducted on Ti-102. titanium alloy which coupled Ni-electroplated 30CrMnSiA, Zn-electroplated 30CrMnSiA, Cd-electroplated 30CrMnSiA and bare 30CrMnSiA, respectively. Corrosion properties including open circuit potential （Eoc）, galvanic corrosion potential （Eg）, and galvanic corrosion current （lg） were monitored. Corrosion morphology was observed by optical microscope （OM） and corrosion mechanism was analyzed and discussed. The results show that the three electroplated coatings improve the corrosion resistance of the anode in different magnitudes. Ni-electroplated 30CrMnSiA and Cd-electroplated 30CrMnSiA coatings are found to be least susceptible to galvanic corrosion when coupled Ti-102. titanium alloy. Zn-electroplated 30CrMnSiA is moderately susceptible to galvanic corrosion. But the bare 30CrMnSiA is highly susceptible to galvanic corrosion in corrosive environment.

关键词： electroplated coating galvanic corrosion Ti-102. 30CrMnSiA

Self-assemblies of TTF derivatives with fluorinated phenyls and pyridine group

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Chinese Chemical Letters 2022年第2期33卷 1100-1104页

作者： Jianghua Fang Xiaoyang Zhu Wendi Luo Jianxun Shi Lejia Wang Bin Tu qingdao Zeng Xunwen Xiao College of material science and Chemical Engineering Ningbo University of TechnologyNingbo 315211China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology(NCNST)Beijing 100190China Zhejiang Pharmaceutical College Ningbo 315100China

The self-assembly characteristics of tetrathiafulvalene(TTF) derivatives molecules 1-3 at the 1-phenyloctane/HOPG(HOPG = highly oriented pyrolytic graphite) interface had been carefully studied by scanning tunneling microscopy(STM) method. The number of F atoms on the phenyl group had significantly affected the self-assembly structures. High-resolution STM images make clear the different assembly structures between the molecules 1-3, which attribute to the different F atom numbers and pyridine group in the molecule. Density functional theory(DFT) calculations have been performed to reveal the formation mechanism.

关键词： TTF Self-assembly STM DFT calculation Hydrogen bonds

Study on Synergic Risk Management Mode for Occupational Hazards in Workplace

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Study on Synergic Risk Management Mode for Occupational Haza...

Specific distribution of orientated C70-fullerene triggered by solvent-tuned macrocycle adlayer

2.11 International Conference on Management science and Intelligent Control(ICMSIC 2.11)

作者： TIAN Yanqing School of material science and Engineering Xi’an {2. of Architecture&technology Xi’an china YANG Zhenhong School of material science and Engineering Xi’an {2. of Architecture&technology Xi’an china

The occupational hazards management in workplace involves occupational hazards identification,hazards analysis, hazards assessment,hazards warning and intervention,hazards management and continuous *** paper mostly discusses how to effectively carry out occupational hazards management work in the aspects mentioned *** analyses 5 levels of occupational hazards administrators,including management level,operating level,supporting level,supervision level and coordinative level,5 stages of the occupational diseases process, including incubation period,growth period,critical period,occurring period and disposal period,and 5 sectors of management resources,including software,hardware,environment,human and ***,a mode for occupational hazards management based on the 5 levels,5 stages and 5 resources synergy is ***,a case study is analyzed in *** example shows that this mode is suitable to occupational hazards management in workplace and provides a new idea for occupational hazards prevention and control of enterprise and occupational hazards supervision of ***,it may be a reference for establishing a synthetic system with dynamic management for occupational hazards in workplace.

关键词： workplace occupational hazards risk management synergic mode

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Nano Research 2017年第3期10卷 991-1000页

作者： Yanfang Geng Ping Li Jindong Xue Dapeng Luo Junyong Zhang Lijin Shu Ke Deng Jingli Xie qingdao Zeng CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Cen ter for Nanoscience and Technology (NCNST) No. 11 Beiyitiao Zhongguancun Beijing 100190 China Key Laboratory of Organosilicol Chemistry and material technology of Ministry of Education Hangzhou Normal University Hangzhou 310012 China College of Biological Chemical Science and Engineering Jiaxing University Jiaxing 314001 China

The precise localization of organic molecules in controllable positions is an important step towards constructing functional nanostructures via the bottom-up strategy. Herein, supramolecularly organized C70-fullerene assemblies on macrocycle-modified surfaces were investigated using scanning tunneling microscopy （STM） in combination with theoretical calculations. The results revealed that an up-assembly of C70-fullerene adlayers was successfully formed on top of the bottom macrocycle arrays. Density functional theory （DFT） calculations confirmed that the macrocycle networks along with the co-adsorbed solvent 1-phenyloctane served as a selective template for trapping C70-fullerene molecules in the spectral sites and acted as a support for the C70-fullerene molecules. The periodical distribution of the C70-fullerene molecules should facilitate understanding of the strong dependence of the arrangement of C70-fullerene upon the specific interactions （apart from spatial recognition） derived from modification of the sub-monolayers.

关键词： C70-fullerene macrocycle supramolecular assembly scanning tunnelingmicroscopy

环境友好型聚酰胺环氧氯丙烷湿强剂的性能研究

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当代化工 2007年第4期36卷 476-478页

作者：王晟青岛科技大学化工学院山东青岛2.6042

聚酰胺聚胺环氧氯丙烷树脂(PAE)是在中性条件下固化的应用较广泛的湿强剂,但它具有固含量不高,产品中含有有机氯等缺点。考察了采用改进的溶液聚合合成反应条件与有机胺后处理相结合的新工艺开发的环境友好型低氯高固含量PAE湿强树脂对... 详细信息

聚酰胺聚胺环氧氯丙烷树脂(PAE)是在中性条件下固化的应用较广泛的湿强剂,但它具有固含量不高,产品中含有有机氯等缺点。考察了采用改进的溶液聚合合成反应条件与有机胺后处理相结合的新工艺开发的环境友好型低氯高固含量PAE湿强树脂对纸张湿强度影响。结果表明,该低氯高固含量PAE树脂在合适的条件下能显著的提高纸张的湿强性,是一种具有市场开发前景新型的湿强剂。

关键词：湿强剂 PAE树脂有机氯高固含量

Study on the Removal of Iron,Manganese and Nitrate in Groundwater by Biological Ribbon technology

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地学前缘 2009年第S1期16卷 190-191页

作者： Yuchen Li,Yukun Ju School of Water Resources & environment,china {2. of Geosciences(Beijing),Beijing 100083,china

The pollution of iron,manganese and nitrate in groundwater is a huge threat to human *** this study,column experiments of ceramic,manganese sand,ceramic sand,volcanic rock,quartz sand were *** and manganese contents of influent were 3.3 mg/L and 2.1 mg/*** the biofilm became mature,the highest iron and manganese removal rate achieved by manganese sand as a filter *** did a little worse than manganese sand,but other three filter material could not reach

关键词： removal of iron manganese and nitrate groundwater biological ribbon technology

The Effect of Microstructure of X70 Pipeline Steel on Electrochemical Reactions in an Acidic Soil environment and its Implication on SCC Characteristic

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The Effect of Microstructure of X70 Pipeline Steel on Electr...