检索结果-南通市图书馆

Fabrication of metal suspending nanostructures by nanoimprint lithography(NIL) and isotropic reactive ion etching(RIE)

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2009年第5期52卷 1181-1186页

作者： XIE GuoYong zhang Jin zhang yongyi zhang YingYing ZHU Tao LIU ZhongFan Center for Nanoscale Science and Technology(CNST) College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Nanotechnology Industrialization Base of China Tianjin 300457China

We report herein a rational approach for fabricating metal suspending nanostructures by nanoimprint lithography(NIL) and isotropic reactive ion etching(RIE).The approach comprises three principal steps:(1) mold fabrication,(2) structure replication by NIL,and(3) suspending nanostructures creation by isotropic *** this approach,suspending nanostructures with Au,Au/Ti or Ti/Au bilayers,and Au/Ti/Au sandwiched structures are *** Au nanostructures,straight suspending nanostructures can be obtained when the thickness of Au film is up to 50 nm for nano-bridge and 90 nm for nano-finger *** the thickness of Au is below 50 nm for nano-bridge and 90 nm for nano-finger,the Au suspending nanostructures bend upward as a result of the mismatch of thermal expansion between the thin Au films and Si *** leads to residual stresses in the thin Au *** Au/Ti or Ti/Au bilayers nanostructures,the cantilevers bend toward Au film,since Au has a larger thermal expansion coefficient than that of *** in the case of sandwich structures,straight suspending nanostructures are obtained,this may be due to the balance of residual stress between the thin films.

关键词： suspending nanostructure fabrication nanoimprint lithography(NIL) isotropic reactive ion etching(RIE)

One-step wet-spinning assembly of twisting-structured graphene/carbon nanotube fiber supercapacitor

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第12期29卷 434-441页

作者： Zhengpeng Yang Yuanheng Jia Yutao Niu yongyi zhang Chunjing zhang Ping Li Meng Zhu Qingwen Li Henan Key Laboratory of Materials on Deep-Earth Engineering School of Materials Science and EngineeringHenan Polytechnic UniversityJiaozuo 454003HenanChina Key Laboratory of Multifunctional Nanomaterials and Smart Systems Advanced Materials DivisionSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123JiangsuChina School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026AnhuiChina Division of Nanomaterials and Jiangxi Key Lab of Carbonene Materials Suzhou Institute of Nano-Tech and Nano-BionicsNanchangChinese Academy of SciencesNanchang 330200JiangxiChina

Graphene fiber-based supercapacitors hold great promise as flexible energy-storage devices. However, simultaneously achieving high ion-transport ability in electrode and electrolyte layer, which is crucial for realizing the high electrochemical performance, still remains challenging. Here, a facile and effective strategy to solve the problem was proposed by developing a twisting-structured graphene/carbon nanotube(CNT) fiber supercapacitor via one-step wet-spinning process with customized multi-channel *** remarkable structure features of the resulting fiber supercapacitor with wrinkled and thin electrolyte layer, and well-developed porosity of fiber electrode favored the rapid infiltration and transport of electrolyte ions inside the electrode, as well as between electrode and electrolyte, thus boosting high specific capacitance of 187.6 mF cm^(-2) and energy density of 30.2 μWh cm^(-2), and featuring long cycling life(93%capacitance retention after 10,000 cycles) and excellent flexibility. Moreover, the specific capacitance and energy density could be further improved to 267.2 m F cm^(-2) and 66.8 μWh cm^(-2), respectively, when Mn O2 was incorporated into the fiber.

关键词： One-step wet-spinning Graphene fiber-based supercapacitor Twisting-structured fiber Ion transport

FeCo alloy catalysts promoting polysulfide conversion for advanced lithium-sulfur batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第10期29卷 339-347页

作者： Hongyi Li Linfeng Fei Rong zhang Shenglan Yu yongyi zhang Longlong Shu Yong Li Yu Wang School of Materials Science and Engineering Nanchang UniversityNanchang 330031JiangxiChina Division of Nanomaterials and Jiangxi Key Lab of Carbonene Materials Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesNanchang 330200JiangxiChina College of Chemistry Biology and Material ScienceEast China University of TechnologyNanchang 330013JiangxiChina

Lithium sulfur batteries(LSBs)draw extensive interest because of the ultra-high capacity and low material ***,the sluggish lithium polysulfides(LIPSs)conversion processes are detrimental to cycle stability and rate capability,inhibiting the commercial application of *** we present the well-designed Fe Co alloy catalysts anchored on porous carbon(FeCo-C)as sulfur host to improve the electrochemical performance by accelerating the conversion *** FeCo alloy demonstrates high catalytic effect and strong adsorption capability of LIPSs,in which potential polarization can be greatly decreased and"shuttle effects"can be largely *** a result,the obtained S/Fe Co-C composites show an initial specific capacity of 791.9 m Ah g^-1 at a large current density of 2 C and maintain 502.5 mAh g^-1 even after 500 ***,720 m Ah g^-1(corresponding to 70%retention)can be achieved after 100 cycles at 0.2 C with a high sulfur content of 80 wt%,enabling high sulfur *** work not only provides a new insight to investigate the conversion kinetics of Li PSs,but also opens up a new avenue for advanced lithium sulfur batteries.

关键词： Lithium sulfur batteries FeCo alloys Catalysts Adsorption Porous carbon

ZnS nanolayer coated hollow carbon spheres with enhanced rate and cycling performance for Li-S batteries

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2022年第2期65卷 272-281页

作者： MENG FanCheng XU Bin LONG Tao CHENG Sheng LI Yong zhang yongyi LIU JieHua School of Materials Science and Engineering Engineering Research Centre of High-Performance Copper Alloy Materials and ProcessingMinistry of EducationHefei University of TechnologyHefei 230009China Division of Nanomaterials and Jiangxi Key Lab of Carbonene Materials Suzhou Institute of Nano-Tech and Nano-BionicsNanchangChinese Academy of SciencesNanchang 330200China Instrumental Analysis Centre Hefei University of TechnologyHefei 230009China School of Instrument Science and Opto-electronics Engineering Hefei University of TechnologyHefei 230009China Key Laboratory of Multifunctional Nanomaterials and Smart Systems Advanced Materials DivisionSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China

Conductive carbon structure has been considered as a promising sulfur-hosting material as the cathode of lithium-sulfur ***, the issue of polysulfide shuttling requires an additional component to help restrict and convert sulfur ***, in this work, hollow and porous carbon nanospheres(HCS) are synthesized by a template method and a high-temperature carbonization treatment. A thin layer of ZnS coating is then deposited on the HCS-based sulfur(ZnS@HCS/S) cathode with controlled thickness, and the overall electrochemical properties are systematically evaluated. Results show that with 30 nm-thick ZnS coating, the cathode reveals an improved capacity of 1411 m A h g^(-1), and higher capacities from 0.2 to 3 C rate compared with bare HCS/S cathode. Moreover, the ZnS coating also enhances the cycling stability of ZnS@HCS/S cathode over 280 cycles at 0.5 C, with only 0.2% capacity decay per cycle. This work demonstrates potential applications for high-performance lithiumsulfur batteries.

关键词： lithium-sulfur battery ZnS nanolayer hollow carbon sphere rate performance cycling stability

High-loading Co-doped NiO nanosheets on carbon-welded carbon nanotube framework enabling rapid charge kinetic for enhanced supercapacitor performance

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第11期29卷 240-247页

作者： Hao Xu Yufang Cao Yong Li Pei Cao Dandan Liu yongyi zhang Qing wen Li School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026AnhuiChina Key Laboratory of Multifunctional Nanomaterials and Smart Systems Advanced Materials DivisionSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123JiangsuChina Division of Nanomaterials and Jiangxi Key Lab of Carbonene Materials Suzhou Institute of Nano-Tech and Nano-BionicsNanchangChinese Academy of SciencesNanchang 330200JiangxiChina School of Materials Science and Engineering Nanchang UniversityNanchang 330031JiangxiChina

Developing high power and energy supercapacitors(SCs)is a long-pursued goal for the application in transportation and energy storage ***,a rationally-designed Co-doped nickel oxide nanosheets@carbon-welded carbon nanotube foam(Co-doped NiO@WCNTF)as freestanding electrode is successfully prepared for high power and energy *** WCNTF framework with high specific surface area provides three dimensional highly conductive network for fast charge transport and ensures high loading of active materials(9.2 mg/cm2).Moreover,porous Co-doped NiO nanosheets uniformly anchored on the WCNTF framework enable rapid charge kinetics due to the high intrinsic conductivity of Co-doped Ni O nanosheets and their good contact with conductive WCNTF *** a result,the unique integrated electrode with 3D architecture exhibits an ultrahigh specific capacitance of 11.45 F/cm2 at 5 mA/cm2,outstanding rate capability(11.45 F/cm2 at 5 mA/cm2 and a capacitance retention of 86.2%at 30 mA/cm2)and good cycling stability,suggesting great potential for high performance supercapacitor.

关键词： Carbon nanotube foam Pseudocapacitors Co-doped NiO nanosheets Freestanding electrode

基于有限元分析的单榀变截面门式刚架稳定性研究

在线全文

学校读者我要写书评

暂无评论

甘肃科学学报 2024年第3期36卷 146-152页

作者：李静薇卫杰雄滕振超张永益刘欣东北石油大学土木建筑工程学院黑龙江大庆163000

某门式钢结构厂房进行建筑改造,需对原结构进行稳定性分析。应用ABAQUS软件对某单榀变截面H型钢门式刚架进行了线性屈曲、非线性屈曲以及粘钢加固的分析研究。对改造前结构进行屈曲分析,得到屈曲模态以及荷载-位移曲线。结果表明:刚梁... 详细信息

某门式钢结构厂房进行建筑改造,需对原结构进行稳定性分析。应用ABAQUS软件对某单榀变截面H型钢门式刚架进行了线性屈曲、非线性屈曲以及粘钢加固的分析研究。对改造前结构进行屈曲分析,得到屈曲模态以及荷载-位移曲线。结果表明:刚梁易发生Y轴方向的扭转破坏;结构施加几种微初始缺陷对承载能力影响不大;在结构材料应力达到屈服应力时,荷载系数均小于1.0,结构发生失稳破坏。对梁上下翼缘粘贴钢板以及梁柱节点处全焊接加劲板进行加固补强,将加固前后的荷载-位移曲线、结构应力云图进行对比得到:当结构材料的应力达到屈服应力时,所施加初始缺陷为0 mm时,结构加固后的荷载系数相比加固前提升了61%;当初始缺陷为50 mm时,加固后结构的荷载系数相比加固前提升了52%,且加固后结构荷载系数均大于1.0,梁的应力情况得到明显改善,并且结构的跨中挠度满足规范要求。

关键词：门式刚架屈曲分析微初始缺陷粘钢加固

基于分子动力学模拟预测环氧树脂形状记忆性能研究

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

智能安全

智能安全 2024年第2期3卷 20-28页

作者：张永熠张学军曹洪硕邢悦孙江曼田艳红北京化工大学北京100029 军事科学院国防科技创新研究院北京100071

形状记忆环氧树脂是制备可展开空间结构的重要材料之一,通过分子动力学模拟预测环氧树脂的形状记忆性能是设计与制备形状记忆环氧树脂的有效指导手段。在pcff力场下,通过分子动力学模拟方法,构建了交联度分别为36%、48%、59%、72%和84%... 详细信息

形状记忆环氧树脂是制备可展开空间结构的重要材料之一,通过分子动力学模拟预测环氧树脂的形状记忆性能是设计与制备形状记忆环氧树脂的有效指导手段。在pcff力场下,通过分子动力学模拟方法,构建了交联度分别为36%、48%、59%、72%和84%的三乙烯四胺固化的双酚A环氧树脂聚合物模型,并模拟计算了其玻璃化转变温度、力学性能及形状记忆性能。结果表明,不同交联度的环氧树脂聚合物模型均表现出较好的形状固定率,为80%~86%;分析聚合物模型的x、y、z三轴回复性可知,36%交联度的环氧树脂不具有形状记忆性能,48%交联度的环氧树脂形状记忆性能较差,而59%、72%、84%交联度的环氧树脂的形状回复率均能达到80%以上,具有良好的形状记忆性能,且交联度越高形状回复速度越慢。

关键词：分子动力学模拟形状记忆环氧树脂交联度玻璃化转变温度

Fast Zn^(2+)mobility enabled by sucrose modified Zn^(2+)solvation structure for dendrite-free aqueous zinc battery

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第3期16卷 3839-3846页

作者： Yufang Cao Xiaohui Tang Linge Li Haifeng Tu Yuzhen Hu Yingying Yu Shuang Cheng Hongzhen Lin Liwen zhang Jiangtao Di yongyi zhang Meinan Liu School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Multifunctional Nanomaterials and Smart Systems Advanced Materials DivisionSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Division of Nanomaterials and Jiangxi Key Lab of Carbonene Materials Jiangxi Institute of NanotechnologyNanchang 330200China

Aqueous zinc battery has been regarded as one of the most promising energy storage systems due to its low cost and environmental ***,the safety concern on Zn anodes caused by uncontrolled Zn dendrite growth in aqueous electrolyte hinders their ***,sucrose with multi-hydroxyl groups has been introduced into aqueous electrolyte to modify Zn^(2+)solvation environment and create a protection layer on Zn anode,thus effectively retarding the growth of zinc *** simulations and experiments confirm that sucrose molecules can enter into the solvation sheath of Zn^(2+),and the as-formed unique solvation structure enhances the mobility of Zn^(2+).Such fast Zn^(2+)kinetics in sucrose-modified electrolyte can successfully suppress the dendrite *** this sucrose-modified aqueous electrolyte,Zn/Zn symmetric cells present more stable cycle performance than those using pure aqueous electrolyte;Zn/C cells also deliver an impressive higher energy density of 129.7 Wh·kg^(−1)and improved stability,suggesting a great potential application of sucrose-modified electrolytes for future Zn batteries.

关键词： solvation structure Zn^(2+)mobility dendrite suppression sucrose

Independence and Self-Consciousness of Chinese Philosophy:On the Rewriting of the History of Chinese Philosophy

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

Social Sciences in China 2005年第1期26卷 28-41页

作者： zhang Ruluri Chen yongyi zhang Zhiping

重写中国哲学史必须从哲学的一般意义和中国哲学的特殊性出发,积极开发中国哲学特有的问题域,阐明它与时代的互动关系,特别要突出中国哲学的根本特征棗实践哲学的意义。就中国传统哲学特征而言,实践哲学远比心性之学更具有解释力和现实... 详细信息

重写中国哲学史必须从哲学的一般意义和中国哲学的特殊性出发,积极开发中国哲学特有的问题域,阐明它与时代的互动关系,特别要突出中国哲学的根本特征棗实践哲学的意义。就中国传统哲学特征而言,实践哲学远比心性之学更具有解释力和现实性。近代中西文化全面而深刻的交流接触使得原教旨主义的中国哲学史根本不可能。在撰写中国哲学史时,利用西方哲学的某些资源不但是不可避免的,也是合理的。即便如此,在使用西方哲学观念解释中国哲学时仍要谨慎,概念不是纯粹的形式。正因为如此,建构中国哲学自己的概念体系是未来中国哲学史的题中应有之义;而内在批判和释义学阐发则是新的中国哲学史的基本方法论原则。

关键词：中国哲学史哲学观念释义学方法论西方哲学