检索结果-内蒙古大学图书馆

The influence of alternating cyclic dynamic loads with different low frequencies on the bio-corrosion behaviors of AZ31B magnesium alloy in vitro

引用

Bioactive Materials 2022年第1期7卷 263-274页

作者： Linyuan Han Zhenwei Zhang Jianwei Dai Xuan Li Jing Bai Zhihai Huang Chao Guo Feng Xue Chenglin Chu School of Materials Science and Engineering Southeast UniversityNanjing211189JiangsuChina Jiangsu Key Laboratory for Advanced Metallic Materials Southeast UniversityNanjing211189JiangsuChina School of Materials Engineering Nanjing Institute of TechnologyNanjing211189JiangsuChina Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing211189China

The real physiological environment of human body is complicated with different degrees and forms of dynamic loads applied to implanted medical devices due to the daily activities of the patients,which would have impacts on the degradation behaviors of magnesium alloy *** this work,the bio-corrosion behaviors of AZ31B magnesium alloy under alternating cyclic dynamic loads with different low frequencies(0.1-2.5 Hz)were specially *** was found that the bio-degradation performances under external dynamic stressed conditions were much severer than those under unstressed conditions and static *** corrosion rates were generally accelerated as the rise of cyclic *** a numerical model for the degradation process of Mg alloy was *** corrosion current density icorr of Mg alloy and the applied loading frequency f matches a linear relationship of ln icorr∝f,which is the result of interactions between the cyclic alternating load and corrosive *** work could provide a theoretical reference and an experimental basis for further researches on the biodegradation behaviors of biomedical materials under dynamic conditions.

关键词： Magnesium alloy Biocorrosion Fatigue Frequency

来源：评论

学校读者我要写书评

暂无评论

Effect of Glutinous Rice Flour on Mechanical Properties and Microstructure of Cement-based Materials

引用

Journal of Wuhan University of technology(Materials Science) 2023年第2期38卷 394-400页

作者： FENG Qi LU Bao WANG Dan Guangxi Key Lab of Road Structure and Materials Guangxi Transportation Science and Technology Group Co.LtdNanning5300007China Key Laboratory for Advanced Technology in Environment Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng224051China Special Glass Key Lab of Hainan Province&State Key Laboratory of Marine Resource Utilization in South China Sea Hainan UniversityHaikou570228China

The mechanism of glutinous rice flour,a kind of natural admixture,on the hydration process,setting time,and microstructure of the Portland cement was *** experimental results show that the glutinous rice flour has an obvious setting retarding effect on cement *** optimal dosage of the glutinous rice flour is 3wt%.In this case,the initial and final setting time of the paste are delayed by 140 and185 min,*** flexural and compressive strengths of the hardened paste are increased by 0.35%and 0.07%after 56 d of *** glutinous rice flour hinders the mineral dissolution process and decreases the concentration of calcium ion at the initial stage of hydration due to the complexation effect,thereby hindering the nucleation and growth of CH and C-S-H phases and prolonging the hydration ***,C-S-H phases combine with the glutinous rice flour to contribute the bonding effect together,which compacts the microstructure of hardened cement pastes at the later hydration stage of cement ***,in-depth investigation on the utilization of glutinous rice flour as the admixture for the Portland cement is expected to be meaningful for the control of hydration exothermic rate and setting time.

关键词： glutinous rice flour cement-based materials mechanical properties setting time

来源：评论

学校读者我要写书评

暂无评论

Development of organic redox-active materials in aqueous flow batteries: Current strategies and future perspectives

引用

SmartMat 2023年第4期4卷 85-104页

作者： Mingguang Pan Minhua Shao Zhong Jin State Key Laboratory of Coordination Chemistry MOE Key Laboratory of Mesoscopic ChemistryMOE Key Laboratory of High Performance Polymer Materials and TechnologyJiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjingChina Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyHong KongChina

Aqueous redox flow batteries,by using redox-active molecules dissolved in nonflammable water solutions as electrolytes,are a promising technology for grid-scale energy *** redox-active materials offer a new opportunity for the construction of advanced flow batteries due to their advantages of potentially low cost,extensive structural diversity,tunable electrochemical properties,and high natural *** this review,we present the emergence and development of organic redox-active materials for aqueous organic redox flow batteries(AORFBs),in particular,molecular engineering concepts and strategies of organic redox-active *** typical design strategies based on organic redox species for high-capacity,high-stability,and high-voltage AORFBs are outlined and *** engineering of organic redox-active molecules for high aqueous solubility,high chemical/electrochemical stability,and multiple electron numbers as well as satisfactory redox potential gap between the redox pair is essential to realizing high-performance *** molecular engineering,the redoxtargeting strategy is an effective way to obtain high-capacity *** further discuss and analyze the redox reaction mechanisms of organic redox species based on a series of electrochemical and spectroscopic approaches,and succinctly summarize the capacity degradation mechanisms of ***,the current challenges,opportunities,and future directions of organic redox-active materials for AORFBs are presented in detail.

关键词： aqueous redox flow batteries grid energy storage molecular engineering strategies organic redox-active materials redox reaction mechanisms

来源：评论

学校读者我要写书评

暂无评论

One-step,in situ formation of WN-W_(2)C heterojunctions implanted on N doped carbon nanorods as efficient oxygen reduction catalyst for metal-air battery

引用

Nano Research 2023年第7期16卷 8773-8781页

作者： Yue Du Wenxue Chen Lina Zhou Rui Hu Shizhu Wang Xueqing Li Yunlong Xie Lun Yang Yisi Liu Zhenhui Liu Institute for Advanced Materials Hubei Normal UniversityHuangshi 435002China College of Material Science and Engineering Jiangsu Key Laboratory of Materials and Technology for Energy ConversionNanjing University of Aeronautics and AstronauticsNanjing 210016China

Transition metal nitrides and carbides have attracted intensive attentions in metal-air battery application due to their metallic electron transport behavior and high chemical stability toward the oxygen reduction reaction(ORR).Herein,the polyoxometalate@polyaniline composite derived WN-W_(2)C heterostructured composite(WN-W_(2)C@pDC)has been fabricated through an in situ nitriding-carbonization strategy,with WN-W_(2)C nanoparticles implanted on N doped carbon *** WN-W_(2)C@pDC demonstrates prominent electrocatalytic performance towards ORR and excellent cycling stability in metal-air battery,which possesses positive half-wave potential and large diffusion limiting current density(0.81 V and 5.8 mA·cm^(-2)).Moreover,it demonstrates high peak power density of 157.4 mW·cm^(-2)as Al-air primary cathode and excellent stability at the discharge-charge test(>500 h)of Zn-air secondary *** excellent activity and durability of WNW_(2)C@pDC catalyst should be attributed to the combined effect of intimate WN-W_(2)C heterointerfaces,unique embedded nanoparticles structure,and excellent electrical media of N doped carbon,confirmed by a series of contrast experiments.

关键词： WN-W_(2)C heterojunctions polyoxometalate@polyaniline composite oxygen reduction reaction metal-air battery

来源：评论

学校读者我要写书评

暂无评论

High-excited-state splitting and multimode vibrational coupling in Mn^(4+)-activated fluoride phosphor

引用

Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 95-101页

作者： Debao Zhang Wanggui Ye Xuguang Cao Ji Zhou Fei Tang Changcheng Zheng Jiqiang Ning Shijie Xu Department of Optical Science and Engineering School of Information Science and TechnologyFudan University Shanghai 200438China Jiangsu Key Laboratory of Advanced Laser Materials and Devices Schoolof Physics and Electronic Engineering Jiangsu Normal UniversityXuzhou 221116China Division of Natural and Applied Sciences Duke Kunshan UniversityKunshan 215316China

Excited-states play a crucial role in the optical absorption and luminescence of solids and hence their accurate information is highly desired. Herein, we attempt to seize the excited-states information of Mn^(4+)ions in K_(2)SiF_(6) microcrystals via measuring and calculating their variable-temperature photoluminescence excitation(PLE) spectra. At cryogenic temperatures, an unpredicted splitting of the high-excited-state is observed. Moreover, the two-split high-excited-state levels are further revealed to primarily couple with the two hyperfine split modes of quasi-localized ν2 vibration in the distorted Mn-F_(6) octahedral configuration,whereas the coupling strengths are found to be substantially different from each other. The slightly split vibrational mode is firmly supported by the low-temperature Raman spectra. Jahn-Teller lattice distortion is believed to be responsible for the observed splitting of the electronic high-excited-state and the quasi-localized vibrational mode.

关键词： splitting of excited-state photoluminescence excitation spectrum electron-phonon coupling Jahn-Teller effect

来源：评论

学校读者我要写书评

暂无评论

Inverse gradient nanostructure through gradient cold rolling demonstrated with superelasticity improvement in Ti-50.3Ni shape memory alloy

引用

Journal of Materials Science & technology 2024年第18期185卷 233-244页

作者： Jian Zhang Ke Liu Tong Chen Chen Xu Chen Chen Dingshun Yan Ann-Christin Dippel Jun Sun Xiangdong Ding Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology Jiangnan UniversityWuxi 214122China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China School of Materials Science and Engineering Central South UniversityChangsha 410083China Deutsches Elektronen-Synchrotron DESY Notkestrasse 85Hamburg 22607Germany

Gradient nanostructured(GNS)metallic materials are commonly achieved by gradient severe plastic de-formation with a gradient of nano-to micro-sized structural units from the surface/boundaries to the ***,such GNS can be inversely positioned,which however has not yet been *** present work reports a facile method in deformation gradient control to attain inverse gradient nanostructured(iGNS),i.e.,tailoring the cross-section shape,successfully demonstrated in Ti-50.3Ni shape memory alloy(SMA)wire through cold *** microstructure of the rolled wire is characterized by a macroscopic inverse gradient from boundaries to the center—the average sizes of grain and martensite domain evolve from micrometer to nanometer *** iGNS leads to a gradient martensitic transforma-tion upon stress,which has been proved to be effectively reversible via in-situ bending scanning electron microscopy(SEM)*** iGNS Ti-50.3Ni SMA exhibits quasi-linear superelasticity(SE)in a wide temperature range from 173 to 423 *** to uniform cold rolling,the gradient cold rolling with less overall plasticity further improves SE strain(up to 4.8%)and SE ***-situ tensiling synchrotron X-ray diffraction(SXRD)analysis reveals the underlying mechanisms of the unique SE in the iGNS *** provides a new design strategy to realize excellent SE in SMAs and sheds light on the advanced GNS metallic materials.

关键词： Inverse gradient nanostructured metallics Gradient cold rolling Shape memory alloys Gradient martensitic transformation Superelasticity

来源：评论

学校读者我要写书评

暂无评论

Two-dimensional(n = 1) ferroelectric film solar cells

引用

National Science Review 2023年第7期10卷 142-150页

作者： Chen Wang Jiahao Gu Jun Li Jianyu Cai Lutao Li Junjie Yao Zheng Lu Xiaohan Wang Guifu Zou College of Energy Soochow Institute for Energy and Materials Innovations and Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University College of Mechanical and Electronic Engineering Shandong University of Science and Technology

Molecular ferroele ctrics that have excellent ferroelectric properties,a low processing temperature,narrow bandgap,and which are lightweight,have shown great potential in the photovoltaic ***,two-dimensional(2D) perovskite solar cells with high tunability,excellent photo-physical properties and superior long-term stability are limited by poor out-of-plane conductivity from intrinsic multi-quantum-well electronic *** work uses 2D molecular ferroelectric film as the absorbing layer to break the limit of multiple quantum *** 2D ferroelectric solar cells achieve the highest open-circuit voltage(1.29 V) and the best efficiency(3.71%) among the 2D(n=1) Ruddlesden-Popper perovskite solar cells due to the enhanced out-of-plane charge transport induced by molecular ferroelectrics with a strong saturation polarization,high Curie temperature and multiaxial *** work aims to break the inefficient out-of-plane charge transport caused by the limit of the multi-quantum-well electronic structure and improve the efficiency of 2D ferroelectric solar cells.

关键词： molecular ferroelectric film 2D perovskite ferroelectric film multiaxial ferroelectrics out-of-plane charge transport solar cell

来源：评论

学校读者我要写书评

暂无评论

The strategies to improve TMDs represented by MoS_(2)electrocatalytic oxygen evolution reaction

引用

Chinese Chemical Letters 2024年第11期35卷 203-213页

作者： Junan Pan Xinyi Liu Huachao Ji Yanwei Zhu Yanling Zhuang Kang Chen Ning Sun Yongqi Liu Yunchao Lei Kun Wang Bao Zang Longlu Wang State Key Laboratory of Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology)Nanjing 210023China State Key Laboratory of Chemo/Bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringAdvanced Catalytic Engineering Research Center of the Ministry of EducationHunan UniversityChangsha 410082China

The hydrogen evolution reaction(HER)and the oxygen evolution reaction(OER)are the two half reactions that make up the over water splitting *** oxygen evolution reaction rate wound immensely raise the efficiency of over water splitting reaction because it is the rate limiting reaction in water splitting *** key to improve OER performance is the development and utilization of advanced *** one of the most potential catalysts for HER,it has gradually attracted the attention of researchers in the aspect of catalytic *** is very necessary to review the research progress of Transition metal dichalcogenides(TMDs)in catalytic OER to promote the research process in the *** this review,we comprehensively and systematically summarized the strategies to improve TMDs electrocatalytic *** of all,structural regulation of TMDs-based electrocatalyst was summarized in detail,mainly including size engineering,defect engineering,doping engineering,phase engineering and heterojunction *** more,magnetic field regulation as a representative of external field regulation to improve TMDs electrocatalytic OER performance was discussed in *** but not least,the strategies to improve TMDs electrocatalytic OER is prospected and some views on the development of this field are also put forward,which are expected to enhance the catalytic efficiency of TMDs for OER.

关键词： Oxygen evolution reaction Transition metal dichalcogenides Structural regulation External field regulation Electrocatalyst

来源：评论

学校读者我要写书评

暂无评论

Integration of morphology and electronic structure modulation on cobalt phosphide nanosheets to boost photocatalytic hydrogen evolution from ammonia borane hydrolysis

引用

Green Energy & Environment 2024年第2期9卷 333-343页

作者： Chao Wan Yu Liang Liu Zhou Jindou Huang Jiapei Wang Fengqiu Chen Xiaoli Zhan Dang-guo Cheng School of Chemistry and Chemical Engineering Anhui Province Key Laboratory of Coal Clean Conversion and High Valued UtilizationAnhui University of TechnologyMa'anshan243002China College of Chemical and Biological Engineering Zhejiang UniversityZhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology38 Zheda RoadHangzhou310027China Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission Key Laboratory of Photosensitive Materials&Devices of Liaoning ProvinceSchool of Physics and Materials EngineeringDalian Nationalities University 18 Liaohe West RoadDalian116600China Institute of Zhejiang University-Quzhou 78 Jiuhua Boulevard NorthQuzhou324000China Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology Changzhou University213164China

The controllable and safe hydrogen storage technologies are widely recognized as the main bottleneck for the accomplishment of sustainable hydrogen *** borane(AB)has regarded as a competitive candidate for chemical hydrogen ***,developing efficient yet high-performance catalysts towards hydrogen evolution from AB hydrolysis remains an enormous ***,cobalt phosphide nanosheets are synthesized by a facile salt-assisted along with low-temperature phosphidation strategy for simultaneously modulating its morphology and electronic structure,and function as hydrogen evolution ***,the Co_(2)P nanosheets display extraordinary performance with a record high turnover frequency of 44.9 min^(-1),outperforming most of the noble-metal-free catalysts reported to *** remarkable performance is attributed to its desired nanosheets structure,featuring with high specific surface area,abundant exposed active sites,and short charge diffusion *** findings provide a novel strategy for regulating metal phosphides with desired phase structure and morphology for energy-related applications and beyond.

关键词： Ammonia borane Hydrogen generation Hydrolysis Cobalt phosphide nanosheets Photocatalysis

来源：评论

学校读者我要写书评

暂无评论

Multi-site anchoring lead-halide octahedral by benzylphosphonic acid to regulate phase distribution for efficient PeLEDs

引用

Nano Research 2024年第11期17卷 10034-10041页

作者： Jiahao Tang Yifei Wang Hengyang Xiang Run Wang Kun Zhang Xinyi Lv Xinrui Chen Ziqing Xu Zhesheng Chen Lei Wang Aidi Zhang An Xie Haibo Zeng MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics and Nanomaterials College of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China Engineering Research Center of Functional Polymer Membrane Materials of Jiangsu Province Nanjing Bready Advanced Materials Technology Co. Ltd. Nanjing 211103 China School of Materials Science and Engineering Xiamen University of Technology Xiamen 361024 China

Quasi-two-dimensional perovskite light-emitting diodes (quasi-2D PeLEDs) are emerging as high-potential candidates for new generation of wide-color gamut displays due to their simple, low-cost solution process, and high color purity. However, the luminescence performance of quasi-2D perovskite films is severely limited by dispersed phase distribution and excessive defect density, which are caused by excessive diffusion of nucleation sites during the perovskite growth stage. Here, the benzylphosphonic acid (BPA) molecule, owing to its strong P-O-Pb bond energy sites and strong electronegativity to PEA+, can aggregate lead-halide octahedron to grow high-dimensional phases, avoiding scattered low-dimensional phases (n = 1). The continuous gradient phase distribution will be beneficial to smooth carrier injection and effectively suppress the leakage current in PeLEDs. Meanwhile, the introduction of phosphonic acid groups will fill the vacancies of Pb ions and reduce non-radiative recombination. As a result, the maximum external quantum efficiency (EQE) of PeLEDs can be increased from 8% to 20.6% with a 514 nm light emission and a 21 nm full-width half maximum, and the device lifetime (T 50) is nearly 6-fold of the pristine sample. In addition, this strategy is also suitable for other wavelength. For example, in blue light, performance improvement is also realized that the maximum EQE of 8% and the luminance increased from 1045 to 5264 cd/m2. These results provide a feasible strategy to regulate the phase distribution and passivate the defects of quasi-2D perovskites.

关键词： quasi-2D perovskites light-emitting diodes benzylphosphonic acid phase distribution defect passivation

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：