检索结果-南通市图书馆

Achieving efficient N_(2)electrochemical reduction by stabilizing the N2H*intermediate with the frustrated Lewis pairs

引用

Journal of Energy Chemistry 2022年第3期31卷 628-634,I0017页

作者： Zhe Chen Jingxiang Zhao yan jiao Tao Wang Lichang Yin Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina Center of Artificial Photosynthesis for Solar Fuels School of ScienceWestlake UniversityHangzhou 310024ZhejiangChina College of Chemistry and Chemical Engineering and Key Laboratory of Photonic and Electronic Bandgap MaterialsMinistry of EducationHarbin Normal UniversityHarbin 150025HeilongjiangChina Centre for Materials in Energy and Catalysis(CMEC) School of Chemical Engineering and Advanced MaterialsThe University of AdelaideAdelaideSA5005Australia Department of Physics and Electronic Information Huaibei Normal UniversityHuaibei 235000AnhuiChina

Electrocatalytic nitrogen reduction reaction(eNRR)with sustainable energy under ambient conditions represents an attractive approach to producing ammonia,but the design of the-state-of-the-art electrocatalyst with high efficiency and selectivity still faces formidable *** contrast to traditional eNRR catalyst design strategies focusing on N≡N triple bond activation,we herein theoretically proposed an alternative strategy to improve eNRR performance via stabilizing the N_(2)H^(*)intermediate using catalysts with the frustrated Lewis pairs(FLPs),i.e.,transition metal(TM)atoms and boron(B)atom co-doped 2D black phosphorus(TM-B@BP).Our density functional theory(DFT)results reveal that the TM atom donates electrons to the adsorbed N_(2)molecule,while B atom provides empty orbital to stabilize the adsorption of N_(2)H^(*)*** framework successfully identifies five promising candidates(i.e.,Ti-B@BP,V-B@BP,Cr-B@BP,Mn-B@BP and Fe-B@BP)with low theoretical limiting potentials(−0.60,−0.41,−0.45,−0.43 and−0.50 V,respectively)and high selectivity for *** believe that the intermediate stabilization strategy introduced in current work offers a new opportunity to achieve accelerated and cost-effective ammonia synthesis with electrocatalysis.

关键词： Nitrogen reduction Electrocatalysis Intermediate stabilization strategy Density functional theory

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Fabrication of anti-fouling polyamide nanofiltration membrane by incorporating streptomycin as a novel co-monomer

引用

Chinese Journal of Chemical Engineering 2022年第10期50卷 185-196页

作者： Shujie Guo jiao Du Fangzheng yan Zhi Wang Jixiao Wang Chemical Engineering Research Center School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China Tianjin Key Laboratory of Membrane Science and Desalination Technology State Key Laboratory of Chemical EngineeringCollaborative Innovation Center of Chemical Science and EngineeringTianjin UniversityTianjin 300350China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300350China

Polyamide(PA)thin-film composite(TFC)na nofiltration(NF)membrane has extremely broad application prospects in separation of monovalent/diva lent inorganic salts mixed solutio ***,membrane fouling is the main obstacle to the application of PA,TFC and NF ***(SM)is a hydrophilic antibiotic containing a large number of hydroxyl and amino *** this work,the NF membrane was prepared via interfacial polymerization(IP)between trimesoyl chloride(TMC)in the organic phase and SM/piperazine(PIP)mixture in the aqueous *** NF membrane structure and performance were characterized in *** results showed that SM successfully participated in the *** negative charge and hydrophilicity of membrane surface were *** prepared membrane exhibited good anti-adhesion and anti-bacterial performance,Additionally,when the SM concentration was 2%,the prepared membrane exhibited the optimal *** water permeance was 89.4L·m^(-2)·h^(-1)·MPa^(-1).The rejection of NaCl and Na_(2)SO_(4) were 17,17%and 97.84%,*** NaCl/Na_(3)SO_(4) separation factor of the SM2-PIP/TMC membrane in 1000 mg·L^(-1) NaCl and 1000 mg·L^(-1)Na_(2)SO_(4) mixed solution was 40,which was 3.3 times that of PIP/TMC *** indicated that SM2-PIP/TMC demonstrated excellent monovalent/divalent salts separation *** work provided an easy and effective approach to preparing anti-fouling NF membrane while possessing superior monovalent/divalent salts separation performance.

关键词： Streptomycin Polyamide Nanofiltration membrane Anti-adhesion Anti-bacterial

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Research advances on ecotype and sub-ecotype differentiation of Prochlorococcus and its environmental adaptability

引用

Science China Earth Sciences 2020年第11期63卷 1691-1700页

作者： Wei yan Xuejin FENG Wei ZHANG Rui ZHANG Nianzhi jiao College of Marine Science and Technology China University of GeosciencesWuhan 430074China State Key Laboratory of Marine Environmental Science Fujian Key Laboratory of Marine Carbon SequestrationCollege of Ocean and Earth SciencesXiamen UniversityXiamen 361102China

Prochlorococcus,a group of marine cyanobacteria,is the most abundant and smallest oxygen-producing photosynthetic *** is mainly distributed in the euphotic zone of tropical and subtropical oceans and is a key participant in the marine biogeochemical *** has evolved continuously to adapt to the marine environment,and can be considered a recent evolutionary form of cyanobacteria,one of the most ancient life *** diverse ecotypes and subecotypes of Prochlorococcus increase its genomic diversity and environmental adaptability,allowing Prochlorococcus to become a dominant species in its *** we review the ecotype classification and distribution,ecotype and subecotype differentiation,and environmental adaptability of *** also evaluate the role and significance of ecotype and sub-ecotype differentiation of Prochlorococcus,and discuss future research directions on this basis.

关键词： Prochlorococcus Ecotype Sub-ecotype Environmental adaptation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Microcrack-and microvoid-related impact damage and ignition responses for HMX-based polymer-bonded explosives at high temperature

引用

Defence Technology（防务技术） 2022年第9期18卷 1602-1621页

作者： Hai-jiao Xue yan-qing Wu Kun yang Yi Wu State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China School of Aerospace Engineering Beijing Institute of TechnologyBeijing100081China

Investigating the damage and ignition behaviors of polymer-bonded explosive(PBX) under a coupled impact and high-temperature loading condition is required for the safe use of charged PBXs. An improved combined microcrack and microvoid model(CMM) was developed for better describing the thermal effects of deformation, damage, and ignition responses of PBXs. The main features of the model under typical dynamic loadings(i.e. uniaxial tension and compression, and lateral confinement) at different initial temperature were first studied. And then the effects of temperature on impact-shear sensitivity of HMX-based PBXs were investigated. The results showed that the ignition threshold velocity of shear-crack hotspots exhibits an increase from 260 to 270 to 315-325 m/s when initial temperature increases from 301 to 348 K;and then the threshold velocity decreases to 290-300 m/s with the initial temperature continually increasing to 378 K. The predicted ignition threshold velocity level of the explosives under coupled impact and high temperature loading conditions were consistent with the experimental data.

关键词： PBX Thermal-mechanical coupling Numerical simulation Impact Sensitivity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Low-cost solid FeS lubricant as a possible alternative to MoS2 for producing Fe-based friction materials

引用

International Journal of Minerals,Metallurgy and Materials 2017年第1期24卷 115-121页

作者： Tao Peng Qing-zhi yan yan Zhang Xiao-jiao Shi Ming-yang Ba Laboratory of Special Ceramics and Powder Metallurgy University of Science and Technology BeijingBeijing 100083China

Three reaction systems of MoS_2-Fe, FeS -Fe, and Fe S-Fe-Mo were designed to investigate the use of FeS as an alternative to MoS_2 for producing Fe-based friction materials. Samples were prepared by powder metallurgy, and their phase compositions, microstructures, mechanical properties, and friction performance were characterized. The results showed that MoS_2 reacts with the matrix to produce iron-sulfides and Mo when sintered at 1050°C. Iron-sulfides produced in the MoS_2-Fe system were distributed uniformly and continuously in the matrix, leading to optimal mechanical properties and the lowest coefficient of friction among the systems studied. The lubricity observed was hypothesized to originate from the iron-sulfides produced. The Fe S-Fe-Mo system showed a phase composition, porosity, and density similar to those of the MoS_2-Fe system, but an uneven distribution of iron-sulfides and Mo in this system resulted in less-optimal mechanical properties. Finally, the Fe S-Fe system showed the poorest mechanical properties among the systems studied because of the lack of Mo reinforcement. In friction tests, the formation of a sulfide layer contributed to a decrease in coefficient of friction（COF） in all of the samples.

关键词： friction materials solid lubricants iron sulfides molybdenum sulfides

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

High Strength and Stable Proton Exchange Membrane Based on Perfluorosulfonic Acid/Polybenzimidazole

引用

Chinese Journal of Polymer Science 2022年第7期40卷 764-771页

作者： Tang-Cheng Xu Chang-Shui Wang Zhao-Yu Hu jiao-jiao Zheng shao-Hua Jiang Shui-Jian He Hao-Qing Hou College of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang330022China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing210037China

In this work,a series of high strength,thermal stable and antioxidant proton exchange membranes were designed with solution processible polybenzimidazole(PBI)as the matrix and perfluorosulfonic acid(PFSA)as the fortifier for proton *** processible PBI was successfully synthesized by introducing 4,4’-dicarboxydiphenyl ether into the molecular chains of ***/PBI composite membranes were obtained by solution blending and film *** and PFSA/PBI composite membranes exhibited greatly enhanced tensile strength and Young’s modulus compared to ***/PBI composite membranes are stable below 300℃ which are suitable for practical application in proton exchange membrane fuel *** PFSA/PBI composite membranes show good dimensional stability with low water uptake and swelling *** PFSA/PBI composite membranes also exhibit excellent antioxidation stability with less than 5%initial mass loss over 120 h in Fenton *** proton conductivity of PBI is greatly enhanced by blending with PFSA and the proton conductivities of the composite membranes are increased with the raise of PFSA content and *** work offers valuable insights into the exploration of PBI based high-performance proton exchange membranes.

关键词： Solution processible polybenzimidazole Perfluorosulfonic acid Proton exchange membrane Film casting High strength

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

First principles study of behavior of helium at Fe(110)-graphene interface

引用

Chinese Physics B 2021年第4期30卷 432-437页

作者： yan-Mei Jing shao-Song Huang Key Laboratory of Material Modification by Laser Ion and Electron Beams(Dalian University of Technology)Ministry of EducationDalian 116024China

Recently,metal-graphene nanocomposite system has aroused much interest due to its radiation tolerance ***,the related atomic mechanism for the metal-graphene interface is still ***,stainless steels with Fe as main matrix are widely used in nuclear ***,in this study,the atomic behaviors of point defects and helium(He) atoms at the Fe(110)-graphene interface are investigated systematically by first principles *** results indicate that graphene interacts strongly with the Fe(110) *** comparison with those of the original graphene and bulk Fe,the formation energy values of C vacancies and Fe point defects decrease significantly for Fe(110)-***,as He atoms have a high migration barrier and large binding energy at the interface,they are trapped at the interface once they enter into *** theoretical results suggest that the Fe(110)-graphene interface acts as a strong sink that traps defects,suggesting the potential usage of steel-graphene with multiply interface structures for tolerating the radiation damage.

关键词： Fe(110)-graphene helium interface first principles calculations

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Controllable synthesis and photocatalytic activities of rod-shaped mesoporous titanosilicate composites with varied aspect ratios

引用

Chinese Chemical Letters 2014年第6期25卷 962-966页

作者： Feng-jiao Chen Chang-Wang shao Min-Nan Zhao Zhao-Sheng Bu yan Zhang Xiao-Nan Dai Guo-Wei Zhou Key Laboratory of Fine Chemicals in Universities of Shandong School of Chemistry and Pharmaceutical EngineeringQilu University of Technology School of Chemical Engineering and Environment Weifang University of Science and Technology

Rod-shaped mesoporous titanosilicate composites （RMTSs） with controllable aspect ratios （ARs） were fabricated using cetyltrimethylammonium bromide （CTAB） and ammonium hydroxide （NH4OH） at a continuous stirring rate, resulting in ARs ranging from 1 to 5. Slowing the stirring rate or increasing the concentration of CTAB mainly impacted the length growth, whereas NH4OH affected the width growth. Photocatalytic activity studies revealed that the length of RMTSs played a more significant role than the width at lower ARs in their photocatalytic activity.

关键词： Titanosilicate Aspect ratio Growth direction Photocatalytic activity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Elastoplastic cup model for cement-based materials

引用

Water Science and Engineering 2010年第1期3卷 102-112页

作者： yan ZHANG Jian-fu shao College of Mechanics and Materials Hohai University Nanjing 210098 P. R. China Laboratory of Mechanics of Lille UMR 8107 CNRS Villeneuve d＇Ascq 59655 France

Based on experimental data obtained from triaxial tests and a hydrostatic test, a cup model was formulated. Two plastic mechanisms, respectively a deviatoric shearing and a pore collapse, are taken into account. This model also considers the influence of confining pressure. In this paper, the calibration of the model is detailed and numerical simulations of the main mechanical behavior of cement paste over a large range of stress are described, showing good agreement with experimental results. The ease study shows that this cup model has extensive applicability for cement-based materials and other quasi-brittle and high-porosity materials in a complex stress state.

关键词： cup model cement-based materials plastic shearing mechanism plastic porecollapse mechanism numerical simulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis of Spiro Dihydrofurans and 1,8-Dioxo-xanthenes via DABCO Catalyzed Tandem Reaction of Aldehyde with Cyclohexane-1,3-dione and Dimedone

引用

Chemical Research in Chinese Universities 2011年第1期27卷 49-53页

作者： CHEN jiao SHI Jian yan Chao-guo College of Chemistry ＆ Chemical Engineering Yangzhou University Yangzhou 225002 P. R. China

The 1,4-diazabicyclo[2.2.2]octane（DABCO） catalyzed reaction of cyclohexane-1,3-dione or dimedone with various aldehydes in acetonitrile resulted in the polysubstituted tetraketones, spiro dihydrofurans or 1,8-dioxo-... 详细信息

关键词： Tandem reaction Dimedone Spiro dihydrofuran Tetraketone 1,8-Dioxo-xanthene

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：