检索结果-内蒙古大学图书馆

Atomically Dispersed Semimetallic Selenium on Porous Carbon Membrane as an Electrode for Hydrazine Fuel Cells

Angewandte Chemie 2019年第38期131卷

作者： Tongzhou Wang Qiang Wang Yucheng Wang Yunli Da Wu Zhou Yue Shao Debao Li Sihui Zhan Jiayin Yuan Hong Wang Key Laboratory of Functional Polymer Materials (Ministry of Education) Institute of Polymer Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China State Key Laboratory of Coal Conversion Institute of Coal Chemistry The Chinese Academy of Sciences Taiyuan 030001 Shanxi P. R. China Department of Materials and Environmental Chemistry Stockholm University 10691 Stockholm Sweden School of Physical Sciences and CAS Centre for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 P. R. China Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education) College of Environmental Science and Engineering Nankai University Tianjin 300071 P. R. China

Electrochemically functional porous membranes of low cost are appealing in various electrochemical devices used in modern environmental and energy technologies. Herein we describe a scalable strategy to construct electrochemically active, hierarchically porous carbon membranes containing atomically dispersed semi‐metallic Se, denoted SeNCM. The isolated Se atoms were stabilized by carbon atoms in the form of a hexatomic ring structure, in which the Se atoms were located at the edges of graphitic domains in SeNCM. This configuration is different from that of previously reported transition/noble metal single atom catalysts. The positively charged Se, enlarged graphitic layers, robust electrochemical nature of SeNCM endow them with excellent catalytic activity that is superior to state‐of‐the‐art commercial Pt/C catalyst. It also has long‐term operational stability for hydrazine oxidation reaction in practical hydrazine fuel cell.

关键词： Atomare Dispergierung Elektrokatalyse Hydrazinoxidation Poröse Kohlenstoffmembranen Selen

来源：评论

学校读者我要写书评

暂无评论

Innentitelbild: Atomically Dispersed Semimetallic Selenium on Porous Carbon Membrane as an Electrode for Hydrazine Fuel Cells (Angew. Chem. 38/2019)

引用

Angewandte Chemie 2019年第38期131卷

来源：评论

学校读者我要写书评

暂无评论

Inside Cover: Atomically Dispersed Semimetallic Selenium on Porous Carbon Membrane as an Electrode for Hydrazine Fuel Cells (Angew. Chem. Int. Ed. 38/2019)

引用

Angewandte Chemie International Edition 2019年第38期58卷

作者： Tongzhou Wang Dr. Qiang Wang Dr. Yucheng Wang Dr. Yunli Da Prof. Wu Zhou Yue Shao Dr. Debao Li Prof. Dr. Sihui Zhan Prof. Dr. Jiayin Yuan Prof. Dr. Hong Wang Key Laboratory of Functional Polymer Materials (Ministry of Education) Institute of Polymer Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China State Key Laboratory of Coal Conversion Institute of Coal Chemistry The Chinese Academy of Sciences Taiyuan 030001 Shanxi P. R. China Department of Materials and Environmental Chemistry Stockholm University 10691 Stockholm Sweden School of Physical Sciences and CAS Centre for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 P. R. China Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education) College of Environmental Science and Engineering Nankai University Tianjin 300071 P. R. China

来源：评论

学校读者我要写书评

暂无评论

PLA based bionanocomposites and their transport properties

引用

AIP Conference Proceedings 2018年第1期1981卷

作者： Alena Kalendova Jiri Smotek Petr Stloukal Milan Kracalik Miroslav Slouf Stephan Laske Polymer Engineering Department Faculty of Technology Tomas Bata University in Zlin Vavreckova 275 760 01 Zlin Czech Republic Environmental Protection Engineering Department Faculty of Technology Tomas Bata University in Zlin Vavreckova 275 76001 Zlin Czech Republic Institute of Polymer Science Johannes Kepler University Linz Altenberger Str. 69 4040 Linz Austria Institute of Macromolecular Chemistry AS CR Heyrovskeho nam. 2 162 06 Prague 6 Czech Republic Polymer Engineering and Science Department Polymer Processing Montanuniversitaet Leoben Otto-Glöckel-Straße 2 8700 Leoben Austria

This paper deals with the evaluation of gas transport properties of bionanocomposites based on polylactic acid 2003D (PLA). Montmorillonite based fillers, Cloisite® 10A, 20A, 30B and natural Cloisite® Na+, were incorporated into PLA polymer films. PLA/clay mixtures were produced by twin screw extruder ZSK-25. Further testing sheets were prepared from PLA/clay mixtures by Brabender Plasti-Corder equipped by flat die. The prepared composites were evaluated for water absorption, permeability of gases and water vapors. Further material morphology was assessed using X-ray diffraction as well as transmission electron microscopy. The best results achieved compositions with PLA/Cloisite10A and Cloisite 30B.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Conformational Entropy as a Means to Control the Behavior of Poly(diketoenamine) Vitrimers In and Out of Equilibrium

引用

Angewandte Chemie 2019年第2期132卷

作者： Changfei He Peter R. Christensen Trevor J. Seguin Eric A. Dailing Brandon M. Wood Rebecca K. Walde Kristin A. Persson Thomas P. Russell Brett A. Helms Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing 100029 China The Molecular Foundry Lawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley CA 94720 USA Energy Technologies Area Lawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley CA 94720 USA Graduate Group of Applied Science and Technology University of California Berkeley CA 94720 USA Environmental Energy Technologies Division Lawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley CA 94720 USA Materials Science and Engineering Department University of California Berkeley CA 94720 USA Materials Sciences Division Lawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley CA 94720 USA Polymer Science and Engineering Department University of Massachusetts Amherst MA 01003 USA

Control of equilibrium and non‐equilibrium thermomechanical behavior of poly(diketoenamine) vitrimers is shown by incorporating linear polymer segments varying in molecular weight (MW) and conformational degrees of freedom into the dynamic covalent network. While increasing MW of linear segments yields a lower storage modulus at the rubbery plateau after softening above the glass transition (T g ), both T g and the characteristic time of stress relaxation are independently governed by the conformational entropy of the embodied linear segments. Activation energies for bond exchange in the solid state are lower for networks incorporating flexible chains; the network topology freezing temperature decreases with increasing MW of flexible linear segments but increases with increasing MW of stiff segments. Vitrimer reconfigurability is therefore influenced not only by the energetics of bond exchange for a given network density, but also the entropy of polymer chains within the network.

关键词： Konformationsentropie Mechanische Eigenschaften Poly(diketoenamine) Rheologie Vitrimere

来源：评论

学校读者我要写书评

暂无评论

Correction: Exfoliation of amorphous phthalocyanine conjugated polymers into ultrathin nanosheets for highly efficient oxygen reduction

引用

Journal of Materials Chemistry A 2019年第11期7卷 6572-6572页

作者： Wenping Liu Chiming Wang Lijie Zhang Houhe Pan Wenbo Liu Jun Chen Dongjiang Yang Yanjuan Xiang Kang Wang Jianzhuang Jiang Xiangdong Yao Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials Department of Chemistry University of Science and Technology Beijing Beijing 100083 China Collaborative Innovation Center for Marine Biomass Fibers Materials and Textiles of Shandong Province College of Chemical and Environmental Engineering Qingdao University Qingdao 266071 China Intelligent Polymer Research Institute ARC Centre of Excellence for Electromaterials Science AIIM Facility University of Wollongong Innovation Campus Wollongong NSW 2522 Australia State Key Laboratory of Catalytic Material and Reaction Engineering Research Institute of Petroleum Processing SINOPEC Beijing 100083 China Queensland Micro- and Nanotechnology Centre Griffith University Nathan Campus QLD 4111 Australia

Correction for ‘Exfoliation of amorphous phthalocyanine conjugated polymers into ultrathin nanosheets for highly efficient oxygen reduction’ by Wenping Liu et al., J. Mater. Chem. A, 2019, 7, 3112–3119.

Correction for ‘Exfoliation of amorphous phthalocyanine conjugated polymers into ultrathin nanosheets for highly efficient oxygen reduction’ by Wenping Liu et al., J. Mater. Chem. A, 2019, 7, 3112–3119.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The Effect of Zinc Stearate Modification on Aging Characteristics of Asphalt Binder

引用

IOP Conference Series: Materials science and engineering 2018年第1期416卷

作者： P Hajikarimi H Shahsavari M Rahi F Sharif F M Nejad Hafez Avenue Department of Civil & Environmental Engineering Amirkabir University of Technology Tehran Iran Narmak Department of Civil Engineering Iran University of Science & Technology Tehran Iran Shahid Tondgooyan Blvd. R&D Department Pasargad Oil Company Tehran Iran Hafez Avenue Department of Polymer & Color Engineering Amirkabir University of Technology Tehran Iran

Different types of modifiers have been investigated to improve aging characteristics of asphalt binders. In this research, the effect of zinc stearate modification has been studied on aging resistance of asphalt binder. For this purpose, viscous flow properties and other rheological characteristics of neat and modified asphalt binders have been evaluated by using conventional experimental tests and superpave protocol test. In order to evaluate rheological behavior of asphalt binder in presence of zinc stearate, a neat asphalt binder sample with three modified samples containing 0.5, 1 and 2 wt% of zinc stearate were aged by means of the Rolling Thin Film Oven Test (RTFOT). The Brookfield rotational viscosity (RV) was implemented at six different temperatures from 100 to 200 degree of centigrade. Furthermore, the dynamic shear rheometer (DSR) was used for evaluating complex modulus (G*) and phase angle (δ) of all neat and modified samples at 10, 20, 30, 40, 50 and 60°C in frequency sweep mode. To evaluate effect of adding zinc stearate by using viscosity results, proportion of asphalt binder's viscosity after aging to its viscosity before aging was defined as viscosity aging index (VAI). Results showed that adding zinc stearate to neat asphalt binder reduces the viscosity aging index. Results of frequency sweep test indicated that zinc stearate causes the values of complex shear modulus in aging asphalt binder approach to neat state which means the effect of zinc stearate modification is positive for improving aging resistance of asphalt binder.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Recycling Of PP/LDPE blend: Miscibility, thermal properties, rheological behavior and crystal structure 74

Recycling Of PP/LDPE blend: Miscibility, thermal properties,...

引用

74th Annual Technical Conference and Exhibition of the Society of Plastics Engineers, SPE ANTEC Indianapolis 2016

作者： Aumnate, Chuanchom Spicker, Claudia Kiesel, Raphael Samadi, Majid Rudolph, Natalie Mechanical Engineering Department Polymer Engineering Center University of Wisconsin-Madison WI United States Textile Science Department of Design Studies and Materials Science Graduate Program University of Wisconsin-Madison WI United States

ISBN: (纸本)9780692719619

Blending of plastics used in packaging is an interesting approach for recycling or upcycling. Therefore, this study focused on the effects of processing on the properties of recycled PP and PP/LDPE blends. MFI measurements, Differential Scanning Calorimetry (DSC) and hot-stage polarized optical microscopy techniques were used to investigate the miscibility of PP/LDPE blends based on the thermal properties, degree of crystallinity, crystallization and morphology development in the blends. The MFI indicates, that PP and PP/LDPE blends are marginally sensitive to degradation at common processing conditions. The degree of crystallinity of the blends decreases with an increase of the LDPE content. Furthermore, the spherulite growth rate and crystal size of PP decrease with an increase of LDPE content. The shifts of crystallization temperatures from the DSC measurement, in conjunction with the crystallization kinetics, indicate that PP/LDPE (25 wt% LDPE) is partially miscible.

关键词： Crystal structure

来源：评论

学校读者我要写书评

暂无评论

environmental assessment and nano-mineralogical characterization of coal,overburden and sediment from Indian coal mining acid drainage

引用

Geoscience Frontiers 2017年第6期8卷 1285-1297页

作者： Madhulika Dutta Jyotilima Saikia Silvio R.Taffarel Frans B.Waanders Diego de Medeiros Cesar M.N.L.Cutruneo Luis F.O.Silva Binoy K.Saikia Department of Chemistry CNB CollegeBokakhat785612AssamIndia Polymer Petroleum and Coal Chemistry Group Materials Science and Technology DivisionCSIR-North East Institute of Science&TechnologyJorhat785006India School of Applied Sciences Department of ChemistryUniversity of Science&TechnologyMeghalayaIndia Academy of Scientific Innovative Research CSIR-NEIST CampusJorhat785006India Laboratory of Environmental Researches and Nanotechnology Development Centro Universitario La SalleMestrado em Avaliacao de Impactos Ambientais em MineracaoVictor Barreto2288 Centro92010-000CanoasRSBrazil School of Chemical and Minerals Engineering North West University(Potchefstroom Campus)Potchefstroom2531South Africa Research Group in Environmental Management and Sustainability Faculty of Environmental SciencesUniversidad De La CostaCalle 58#55-66080002BarranquillaAtla nticoColombia Universidade do Vale do Rio dos Sinos.Av.Unisinos 950 Cristo Rei 90510030Sao LeopoldoRSBrazil

The deterioration of environmental conditions is the major contributory factor to poor health and quality of life that hinders sustainable development in any *** mining is one of the major industries that contribute to the economy of a country but it also impacts the *** chemical parameters of the coal,overburden,soil and sediments along with the coal mine drainage(CMD)were investigated in order to understand the overall environmental impact from high sulphur coal mining at northeastern coalfield(India).It was found that the total sulphur content of the coal is noticeably high compared to the overburden(OB)and *** volatile matter of the coal is sufficiently high against the high ash content of the soil and *** water samples have a High Electrical Conductivity(EC)and high Total Dissolve Solid(TDS).Lower values of pH,indicate the dissolution of minerals present in the coal as well as other minerals in the mine rejects/*** chemical and nano-mineralogical composition of coal,soil and overburden samples was studied using a High Resolution-Transmission Electron Microscopy(HR-TEM),Energy Dispersive Spectroscopy(EDS),Selected-Area Diffraction(SAED),Field Emission-Scanning Electron Microscopy(FE-SEM)/EDS,X-ray diffraction(XRD),Fourier Transform Infrared Spectroscopy(FTIR),Raman and Ion-Chromatographic analysis,and Mossbauer *** different geochemical analysis it has been found that the mine water sample from Ledo colliery has the lowest pH value of 3.30,Tirap colliery samples have the highest electrical conductivity value of5.40 ms cm^(-1)Both Ledo and Tirap coals have total sulphur contents within the range 3-3.50%.The coal mine water from Tirap colliery(TW-15 B)has high values of Mg^(2+)(450 ppm),and Br^-(227.17 ppm).XRD analysis revealed the presence of minerals including quartz and hematite in the *** analysis of coal mine overburden(OB)indicates the presence both of pyrite and marcasite which was also

关键词： Coal mine drainage environmental assessment Indian coal Chemical analysis Nano-mineralogy Advance characterization

来源：评论

学校读者我要写书评

暂无评论

Ambient Electro-Synthesis of Ammonia - Electrode Porosity and Composition engineering

arXiv

引用

arXiv 2018年

作者： Wang, Hong Wang, Lu Wang, Qiang Ye, Shuyang Sun, Wei Shao, Yue Jiang, Zhiping Qiao, Qiao Zhu, Yimei Song, Pengfei Li, Debao He, Le Zhang, Xiaohong Yuan, Jiayin Wu, Tom Ozin, Geoffrey A. Key Laboratory of Functional Polymer Materials Ministry of Education Institute of Polymer Chemistry Nankai University Tianjin300071 China Materials Chemistry and Nanochemistry Research Group Solar Fuels Cluster Departments of Chemistry University of Toronto 80 St. George Street TorontoONM5S3H6 Canada Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University People’s Republic of 199 Ren’ai Road SuzhouJiangsu215123 China Laboratory Taiyuan State Key030001 China Department of Physics Temple University PhiladelphiaPA19122 United States Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory UptonNY11973 United States College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou730070 China Department of Materials and Environmental Chemistry Stockholm University Stockholm10691 Sweden School of Materials Science and Engineering UNSW Australia Kensington Campus Building E10 Rm345 SydneyNSW2052 Australia

Ammonia, key precursor for fertilizer production, convenient hydrogen carrier and emerging clean fuel, plays a pivotal role in sustaining life on earth. Currently, the main route for NH3 synthesis is via the heterogeneous catalytic Haber-Bosch process (N2+3H2 → 2NH3), which proceeds under extreme conditions of temperature and pressure with a very large carbon footprint. Herein we report that a pristine nitrogen-doped nanoporous graphitic carbon membrane (NCM) can electrochemically convert N2 into NH3 in an aqueous acidic solution under ambient conditions. The Faradaic efficiency and rate of production of NH3 on the NCM electrode reach 5.2% and 0.08 g m-2 h-1, respectively. After functionalization of the NCM with Au nanoparticles (Au NPs) these performance metrics are dramatically enhanced to 22% and 0.36 g m-2 h-1, respectively. These efficiencies and rates for the production of NH3 at room temperature and atmospheric pressure are unprecedented. As this system offers the potential to be scaled to industrial proportions there is a high likelihood it might displace the century old Haber-Bosch process. Copyright © 2018, The Authors. All rights reserved.

关键词： Electrocatalysis

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：