检索结果-南通市图书馆

Enhanced electromagnetic wave absorption via optical fiber-like PMMA@Ti_(3)C_(2)T_(x)@SiO_(2) composites with improved impedance matching

引用

Nano Research 2024年第3期17卷 1676-1686页

作者： Huanhuan Niu Xuewen Jiang Wei Li zhiyu min Budi Riza Putra Wulan Tri Wahyuni Hailong Wang Rui Zhang Bingbing Fan School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001China School of Materials Science and Engineering Tongji UniversityShanghai 201804China Department of Materials and Earth Sciences Technical University of DarmstadtDarmstadt 64287Germany School of Material Science and Engineering Luoyang Institute of Science and TechnologyLuoyang 471023China Research Center for Metallurgy National Research and Innovation Agency(BRIN)PUSPIPTEK Gd.470South TangerangBanten 15315Indonesia Analytical Chemistry Division Department of ChemistryFaculty of Mathematics and Natural SciencesIPB UniversityWest Java 16680Indonesia

Ti_(3)C_(2)T_(x) nanosheets have attracted significant attention for their potential in electromagnetic wave absorption(EWA).However,their inherent self-stacking and exorbitant electrical conductivity inevitably lead to serious impedance mismatch,restricting their EWA ***,the optimization of impedance matching becomes *** this work,we developed polymethyl methacrylate(PMMA)@Ti_(3)C_(2)T_(x)@SiO_(2) composites with a sandwich-like core–shell structure by coating SiO_(2) on PMMA@Ti_(3)C_(2)T_(x).The results demonstrate that the superiority of the SiO_(2) layer in combination with PMMA@Ti_(3)C_(2)T_(x),outperforming other relative graded distribution structures and meeting the requirements of EWA *** resulting PMMA@Ti_(3)C_(2)T_(x)@SiO_(2) composites achieved a minimum reflection loss of-58.08 dB with a thickness of 1.9 mm,and an effective absorption bandwidth of 2.88 *** analysis revealed that the structural design of SiO_(2) layer not only optimized impedance matching,but also synergistically enhanced multiple loss mechanisms such as interfacial polarization and dipolar ***,this work provides valuable insights for the future preparation of high-performance electromagnetic wave absorbing Ti_(3)C_(2)T_(x)-based composites.

关键词： polymethyl methacrylate(PMMA)@Ti_(3)C_(2)T_(x)@SiO_(2)composites impedance match SiO_(2)layer optical fiber-like structure interfacial polarization and dipolar polarization

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Sr(Cr_(0.2)Mn_(0.2)Fe_(0.2)C_(0.2)Ni_(0.2))O_(3):A novel high-entropy perovskite oxide with enhanced electromagnetic wave absorption properties

引用

Journal of Materiomics 2024年第6期10卷 1176-1185页

作者： Mengru Li Qing Zhi Jinlu Li Chengwen Wu Xuewen Jiang zhiyu min Rui Zhang Hailong Wang Haibin Wang Bingbing Fan School of Materials Science and Engineering Zhengzhou University Zhengzhou450001China School of Material Science and Engineering Luoyang Instiute pf Science and TechnologyLuoyang471023HenanChina Institute of Advanced Ceramics Henan Acaderry of SciencesZhengzhou450046China

Perovskite materials(ABO_(3))possess a wealth of elements selectable and exhibit a diverse range of octahedral *** emergence of high-entropy perovskite ceramics provides a fresh perspective for advancing the field of wave-absorbing *** this study,we concentrate on the wet chemical synthesis of a high-entropy perovskite oxide,Sr(Cr_(0.2)Mn_(0.2)Fe_(0.2)C_(0.2)Ni_(0.2))O_(3),and investigate its crystal structure,microstructure,chemical composition,magnetic properties,and microwave absorbing *** results indicate that when sintered at a temperature of 1,350℃,the sample achieves a minimum reflection loss of-54.0 dB at a frequency of 9.68 GHz,accompanied by a maximum effective absorption bandwidth(EAB)of 7.44 GHz at the thickness of 1.8 *** high-entropy design of the B-site induces distortions of oxygen vacancy and octahedral structure of the perovskite *** leads to the fine tuning of its dielectric and magnetic properties,thereby endowing perovskite with excellent electromagnetic wave absorption ***,perovskite emerges as a promising new electromagnetic wave absorption material with significant potential.

关键词： High-entropy ceramics Perovskite Microwave absorption Magnetism

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

不同尺寸Li_(6.4)La_(3)Zr_(2)Ga_(0.2)O_(12)颗粒与PEO复合制备高性能柔性固态电解质

引用

中国稀土学报 2024年第4期42卷 742-751,I0004页

作者：卢名亮吕义玮刘志亮李栋李小成闵志宇江西理工大学材料冶金化学学部江西赣州341000 洛阳理工学院材料科学与工程学院河南洛阳471023 江西理工大学动力电池与材料重点实验室江西赣州341000

固体聚合物电解质具有良好的灵活性、低界面阻抗、易加工等特点,具有广阔的应用前景。目前,聚合物电解质存在着室温下离子输运困难和离子电导率低的问题。采用溶液铸造法制备了石榴石Li_(6.4)La_(3)Zr_(2)Ga_(0.2)O_(12)(LLZGO)/聚乙烯... 详细信息

固体聚合物电解质具有良好的灵活性、低界面阻抗、易加工等特点,具有广阔的应用前景。目前,聚合物电解质存在着室温下离子输运困难和离子电导率低的问题。采用溶液铸造法制备了石榴石Li_(6.4)La_(3)Zr_(2)Ga_(0.2)O_(12)(LLZGO)/聚乙烯氧化物(PEO)复合聚合物电解质。通过优化LLZGO粒径,并与PEO结合,制备了高离子电导率的复合电解质。结果表明,当LLZGO粒径为0.5μm时,室温离子电导率为1.5×10^(-4)S·cm^(-1),制备的复合电解质的离子迁移数为0.343,在锂沉积/剥离试验中可稳定循环400 h。在60℃,2.7~4.0 V条件下,组装的Li/复合电解质/LiFePO_(4)电池首次放电比容量为141 mAh·g^(-1),在0.5 C倍率下,循环60次后放电比容量为121.4 mAh·g^(-1),具有良好的循环稳定性。通过优化LLZGO粒径,为提高复合电解质的界面性能、优化机械和电化学性能、开发高性能固体锂金属电池提供了一种可行的方法。

关键词：复合电解质全固态电池石榴石电解质粉离子电导率稀土

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

MXene/CNF复合气凝胶的制备及辐射制冷性能研究

引用

精密成形工程 2024年第6期16卷 44-52页

作者：季鸿途费炎培李港况太荣闵志宇浙江工业大学材料科学与工程学院杭州310000 宁波润禾高新材料科技股份有限公司浙江宁波315000 洛阳理工学院材料科学与工程学院河南洛阳471000

目的探究制备过程中不同MXene含量、预冻温度及方式对MXene/CNF复合气凝胶内部结构和性能的影响。方法采用原位生成HF刻蚀法和冷冻干燥法制备MXene粉末和MXene/CNF复合气凝胶,采用扫描电镜(SEM)观察刻蚀前后的MXene及–18℃、–196℃下... 详细信息

目的探究制备过程中不同MXene含量、预冻温度及方式对MXene/CNF复合气凝胶内部结构和性能的影响。方法采用原位生成HF刻蚀法和冷冻干燥法制备MXene粉末和MXene/CNF复合气凝胶,采用扫描电镜(SEM)观察刻蚀前后的MXene及–18℃、–196℃下不同含量MXene经过均相冷冻和定向冷冻的MXene/CNF气凝胶的微观结构,并测试力学性能、导热率、光谱性能及制冷性能。结果在相同预冻条件下,气凝胶的密度和力学强度随着MXene含量的增加而下降;随着预冻温度的降低,气凝胶孔隙的尺寸减小且数量增加,CM_(50)-18的孔径在103μm左右,而CM_(50)-196具有最小的孔径,为25μm左右。与普通均质冷冻相比,定向冷冻制备的气凝胶的导热率更低,并且随着MXene含量的增加,导热率增大。在80℃加热条件下其表面温度最多能降低33.4℃,制冷性能优异。而样品的表面平均温度随着MXene含量的增加而上升。不同MXene含量的气凝胶对太阳光的平均吸光度能达到0.95以上,对波长为400 nm、874 nm以及1800 nm以上的光的吸光度能达到1。结论通过定向冷冻制备的MXene/CNF的力学性能、光谱性能、制冷性能有所改善。

关键词： MXene 纤维素气凝胶定向冷冻辐射制冷

来源：

维普期刊数据库博看期刊

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

Hydrothermal Synthesis and Visible-light Photocatalytic Activities of SnS_2 Nanoflakes

引用

Journal of Wuhan University of Technology(Materials Science) 2015年第2期30卷 276-281页

作者：贾铁昆 min zhiyu CAO Jianliang SUN Guang WANG Xiaodong ZHANG Zhanying LI Tingting Department of Materials Science and Engineering Luoyang Institute of Science and Technology School of Materials Science and Engineering Henan Polytechnic University Sinosteel Refractory Co. Ltd.

SnS2 nanoflakes were successfully synthesized via a simple hydrothermal process. The as-prepared SnS2 samples were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, nitrogen adsorption-desorption isotherms, and UV-vis diffuse reflectance spectroscopy（DRS）. The photocatalytic activities of the as-prepared SnS2 nanoflakes under visible light irradiation（λ〉420 nm） were evaluated by the degradation of rhodamine B（Rh B）. The effect of hydrothermal temperatures on the photocatalytic efficiency of as-prepared SnS2 nanoflakes was investigated. The experimental result showed that SnS2 nanoflakes synthesized at the temprature of 160 o had higher photocatalytic efficiency and good photocatalytic stability.

关键词： SnS2 nanoflakes hydrothermal synthesis photocatalytic activities stability

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

Effect of polyethylene glycol on the crystallization,rheology and foamability of poly(lactic acid)containing in situ generated polyamide 6 nanofibrils

引用

Frontiers of Chemical Science and Engineering 2023年第12期17卷 2074-2087页

作者： Yuhui Qiao Qian Li Amirjalal Jalali Dongsheng Yu Xichan He Xiaofeng Wang Jing Jiang zhiyu min Department of Materials Science and Engineering Luoyang Institute of Science and TechnologyLuoyang 471023China Henan Province International Joint Laboratory of Materials for Solar Energy Conversion and Lithium Sodium Based Battery Luoyang Institute of Science and TechnologyLuoyang 471023China National Center for International Research of Micro-Nano Molding Technology Zhengzhou 450001China Microcellular Plastics Manufacturing Laboratory Department of Mechanical and Industrial EngineeringUniversity of TorontoToronto M5S 3G8Canada School of Mechanical and Power Engineering Zhengzhou UniversityZhengzhou 450001China

In this study,the rheological properties,crystallization and foaming behavior of poly(lactic acid)with polyamide 6 nanofibrils were examined with polyethylene glycol as a *** 6 particles were deformed into nanofibrils during *** the 10%polyamide 6 case,polyethylene glycol addition reduced the polyamide 6 fibril diameter from 365.53 to 254.63 nm,owing to the smaller polyamide 6 particle size and enhanced interface *** experiments revealed that the viscosity and storage modulus of the composites were increased,which was associated with the three-dimensional entangled network of polyamide 6 *** presence of higher aspect ratio polyamide 6 nanofibrils substantially enhanced the melt strength of the *** isothermal crystallization kinetics results suggested that the polyamide 6 nanofibrils and polyethylene glycol had a synergistic effect on accelerating poly(lactic acid)*** the polyethylene glycol,the crystallization half-time reduced from 103.6 to 62.2 *** foaming results indicated that owing to higher cell nucleation efficiency,the existence of polyamide 6 nanofibrils led to a higher cell density and lower expansion ***,the poly(lactic acid)/polyamide 6 foams exhibited a higher cell density and expansion ratio than that of the foams without polyethylene glycol.

关键词： poly(lactic acid) foaming microfibrillation rheological property crystallization

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

In situ formed cross-linked polymer networks as dual-functional layers for high-stable lithium metal batteries

引用

Journal of Energy Chemistry 2023年第4期79卷 253-262页

作者： Lei Shi Wanhui Wang Chunjuan Wang Yang Zhou Yuezhan Feng Tiekun Jia Fang Wang zhiyu min Ji Hu Zhigang Xue School of Materials Science and Engineering School of Environmental Engineering and ChemistryLuoyang Institute of Science and TechnologyLuoyang 471023HenanChina Key Laboratory for Material Chemistry of Energy Conversion and Storage Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina Key Laboratory of Advanced Materials Processing&Mold(ministry of Education) National Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002HenanChina Henan Intelligent Manufacturing Engineering Technology Research Center for Building Profile Luoyang Institute of Science and TechnologyLuoyang 471023HenanChina Henan Province International Joint Laboratory of Materials for Solar Energy Conversion and Lithium Sodium based Battery Luoyang Institute of Science and TechnologyLuoyang 471023HenanChina

Lithium-metal anodes(LMAs)have been recognized as the ultimate anodes for next-generation batteries with high energy density,but stringent assembly-environment conditions derived from the poor moisture stability dramatically hinder the transformation of LMAs from laboratory to ***,an in situ formed cross-linked polymer layer on LMAs is designed and constructed by a facile thiol-acrylate click chemistry reaction between poly(ethylene glycol)diacrylate(PEGDA)and the crosslinker containing multi thiol groups under UV *** to the hydrophobic nature of the layer,the treated LMAs demonstrate remarkable humid stability for more than 3 h in ambient air(70%relative humidity).The coating humid-resistant protective layer also possesses a dual-functional characterization as solid polymer electrolytes by introducing lithium bis(trifluoromethanesulfonyl)imide in the system in *** intimate contact between the polymer layer and LMAs reduces interfacial resistance in the assembled Li/LiFePO_(4)or Li/LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)full cell effectively,and endows the cell with an outstanding cycle performance.

关键词： Lithium-metal anode Humid-resistant protective film Solid-state polymer electrolytes Cross-linked polymers

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

Compact ultrafast neutron sources via bulk acceleration of deuteron ions in an optical trap

引用

Matter and Radiation at Extremes 2024年第5期9卷 22-31页

作者： zhiyu Lei Hanghang Ma Xiaobo Zhang Lin Yu Yihang Zhang Yutong Li Suming Weng min Chen Jie Zhang Zhengming Sheng Key Laboratory for Laser Plasmas and School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Centre of IFSA Shanghai Jiao Tong UniversityShanghai 200240China Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 201210China College of Physics and Electronics Engineering Northwest Normal UniversityLanzhou 730070China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

A scheme for a quasi-monoenergetic high-flux neutron source with femtosecond duration and highly anisotropic angular distribution is *** scheme is based on bulk acceleration of deuteron ions in an optical trap or density grating formed by two counter-propagating laser pulses at an intensity of-10^(16)W~cm^(2)in a near-critical-density *** deuterons are first pre-accelerated to an energy of tens of keV in the ambipolar fields formed in the optical *** energy is boosted to the MeV level by another one or two laser pulses at an intensity of-10^(20)W~cm^(2),enabling fusion reactions to be triggered with high *** contrast to previously proposed pitcher–catcher configurations,our scheme can provide spatially periodic acceleration structures and effective collisions between deuterons inside the whole target ***,neutrons are generated directly inside the optical *** simulations show that neutron pulses with energy 2–8 MeV,yield 10^(18)–10^(19)n/s,and total number 106–107 in a duration-400 fs can be obtained with a 25μm ***,the neutron pulses exhibit unique angularly dependent energy spectra and flux distributions,predominantly along the axis of the energy-boosting *** microsize femtosecond neutron pulses may find many applications,such as high-resolution fast neutron imaging and nuclear physics research.

关键词： acceleration scheme angular

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Flexo-photocatalysis in centrosymmetric semiconductors

引用

Nano Research 2024年第3期17卷 1173-1181页

作者： Kang Liu Tong Wu Luying Xu Zhuangzhuang Zhang zhiyu Liu Longfei Wang Zhong Lin Wang Center on Nanoenergy Research School of Physical Science&TechnologyGuangxi UniversityNanning 530004China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China College of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Georgia Institute of Technology AtlantaGA 30332-0245USA Yonsei Frontier Lab Yonsei UniversitySeoul 03722Republic of Korea

The separation of photogenerated electron–hole pairs is vitally important for photocatalysis,which can be effectively promoted by polarization ***,it only manifests in piezoelectric/pyroelectric/ferroelectric materials that have a non-centrosymmetric ***,we demonstrate that the polarization enhanced photocatalysis(with wide spectra from ultraviolet(UV)light to visible light)can be achieved in centrosymmetric semiconductors,such asδ-MnO_(2) and TiO_(2) nanosheets integrated nanoflowers,by using the strain-gradient-induced flexoelectric polarization that is always overlooked in polarization-enhanced *** ultrasonic and illumination excitation,the organic pollutants(methylene blue(MB),etc.)can be effectively degraded within 30 min with excellent stability and *** with photocatalysis,the flexo-photocatalytic performance of above centrosymmetric semiconductors is substantially increased by 85%.Moreover,the factors related to flexo-photocatalysis such as material morphology,mechanical stimuli source,and adsorption are explored to deeply understand the mechanism of *** work opens up a way for high-performance photocatalysis in centrosymmetric semiconductors.

关键词： piezo-photocatalysis photocatalysis flexoelectricity polarization centrosymmetric semiconductor

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

New Second-Level-Discrete Zeroing Neural Network for Solving Dynamic Linear System

引用

IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1521-1523页

作者： min Yang School of Robotics Hunan UniversityChangsha 410082China

Dear Editor,This letter deals with a new second-level-discretization method with higher precision than the traditional first-level-discretization ***,the traditional discretization method utilizes the first-order time derivative information,and it is termed first-level-discretization *** contrast,the new discretization method not only utilizes the first-order time derivative information,but also makes use of the second-order derivative *** combining the new second-level-discretization method with zeroing neural network(ZNN),the second-level-discrete ZNN(SLDZNN)model is proposed to solve dynamic(i.e.,time-variant or time-dependent)linear *** experiments and application to angle-of-arrival(AoA)localization show the effectiveness and superiority of the SLDZNN model.

关键词： method derivative utilize

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：