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锐钛矿TiO_2(101)表面电子能带结构的理论研究 被引量:5
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作者 赵俊杰 程俊 《电化学》 CAS CSCD 北大核心 2017年第1期45-52,共8页
二氧化钛作为一种理想的光催化和光电转换半导体材料,受到了广泛的关注和研究,其表面的电子能带结构作为其本征的化学性质之一,决定着表面上氧化还原反应发生的可能性.对二氧化钛表面电子能带结构进行深入研究对于我们从微观上认识并改... 二氧化钛作为一种理想的光催化和光电转换半导体材料,受到了广泛的关注和研究,其表面的电子能带结构作为其本征的化学性质之一,决定着表面上氧化还原反应发生的可能性.对二氧化钛表面电子能带结构进行深入研究对于我们从微观上认识并改良二氧化钛这一光电催化材料,以及进一步开发利用更好的光催化材料都具有非常好的指导意义.本论文采用密度泛函理论,计算研究了锐钛矿TiO_2(101)表面的电子能带结构,并通过与金红石TiO_2(110)晶面的对比,系统分析了两个表面电子能带结构的不同以及水分子的溶剂化作用对电子能带结构的影响. 展开更多
关键词 锐钛矿 价带顶 导带底 电子能级排列 密度泛函理论
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镱的压力效应
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作者 邱巨峰 《稀土信息》 1999年第7期12-12,共1页
大多数稀土金属是三价的,而铕和镱却是二价的。因此铕和镱具有与其它稀土金属不同的反常特性,例如由于镱的二价特性使其原子体积比镥的原子体积大41%,由于镱的这种反常特性。
关键词 金属镱 稀土金 原子体积 压力效应 压缩率 电子转移 结构转变 理论和实验研究 物理学家 电子排列
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Thermal conductivity of PVDF/PANI-nanofiber composite membrane aligned in an electric field 被引量:1
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作者 Hong Guo Xin Li +3 位作者 Ziyi Wang Bao'an Li Jixiao Wang Shichang Wang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第5期1213-1218,共6页
Poly(vinylidene fluoride)(PVDF) is a semi-crystalline thermoplastic polymer with excellent thermal stability,electrochemical stability and corrosion resistance, which has been widely studied and applied in industrial ... Poly(vinylidene fluoride)(PVDF) is a semi-crystalline thermoplastic polymer with excellent thermal stability,electrochemical stability and corrosion resistance, which has been widely studied and applied in industrial nonmetallic heat exchanger and piezoelectric-film sensor. In this study, polyaniline(PANI) nanofibers were synthesized using dodecylbenzene sulfonic acid as the surfactant. The obtained PANI nanofibers were blended in PVDF matrix to enhance thermal conductivity and tensile strength of composite materials. Electric field was applied for the orientation of membrane structure during membrane formation. Scanning electron microscope(SEM) images exhibited that the PANI nanofibers were well-dispersed in the composite membranes. The structure of composite membranes was more orderly after alignment. X-ray diffraction(XRD) and differential scanning calorimetry(DSC) indicated that the content of PANI nanofibers contributed to the transformation of PVDF from α-phase to β-phase. Both the tensile strength and thermal conductivity of composite membranes were significantly improved. This tendency was further enhanced by the application of electric field. The maximum tensile strength was obtained when the content of PANI nanofibers was 3 wt%, which was 46.44% higher than that of pure PVDF membrane. The maximum thermal conductivity of composite membranes after alignment was 84.5% greater than that of pure PVDF membrane when the content of PANI nanofibers was 50 wt%. The composite membrane is a promising new potential material in heat transfer field and the mechanism explored in this study would be informative for further development of similar thermal conductive polymeric materials. 展开更多
关键词 Poly(vinylidene fluoridel Polyaniline nanofibers Composite membrane Thermal conductivity
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高温退火
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《热处理工艺与设备:英文版》 2005年第3期13-15,共3页
SY508-3-59[篇名]A Self-Aligned, Electrically Separable Double-Gate MOS Transistor Technology for Dynamic Threshold Voltage Application,SY508-3-60[篇名]Anomalous phosphorous diffusion,……
关键词 高温退火 极限压力 电子排列 MOS转换器 化学真空沉积
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Cytoskeletal arrangement and its intercellular connection in wheat young leaf cells
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作者 SEIXIANGYUN LINGCHENGJIAN 《Cell Research》 SCIE CAS CSCD 1993年第2期131-139,共9页
By using the techniques of partial digestion of cell wall and selective extraction, we examined the cytoskeleton of wheat young leaf cells under scanning electron micro-scope(SEM). A 3-dimensional cytoskeletal system,... By using the techniques of partial digestion of cell wall and selective extraction, we examined the cytoskeleton of wheat young leaf cells under scanning electron micro-scope(SEM). A 3-dimensional cytoskeletal system, showing some new features, was observed. The cortical network located beneath the cross wall was an anastomosing organization. The association of nucleus with the cell wall by some skeletal filaments was also found. It is noticeable that there were cytoskeletal filaments, which passed through cell wall and connected together with cytoskeletal arrays of adjacent cells. Thus, it is possible that an integral skeletal network existed within the young leaf tissue of wheat. 展开更多
关键词 CYTOSKELETON intercellular connection scanning electron microscopy wheat.
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让金刚石成为超导体的方法
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《现代材料动态》 2004年第6期24-25,共2页
关键词 金刚石 超导体 电子排列方式 硼-碳金刚石
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Closely packed nanoparticle monolayer as a strain gauge fabricated by convective assembly at a confined angle 被引量:2
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作者 Chao Zhang Juan Li +7 位作者 Shanshan Yang Weihong Jiao Shuang Xiao Mingqing Zou Songliu Yuan Fei Xiao Shuai Wang Lihua Qian 《Nano Research》 SCIE EI CAS CSCD 2014年第6期824-834,共11页
The reliability and sensitivity of a strain gauge made from a nanoparticle monolayer intrinsically depend on electron tunneling between the adjacent nanoparticles, so that creating nanoscale interstitials with uniform... The reliability and sensitivity of a strain gauge made from a nanoparticle monolayer intrinsically depend on electron tunneling between the adjacent nanoparticles, so that creating nanoscale interstitials with uniform distribution and tuning the interparticle separation reversibly during cyclic mechanical stress are two vital issues for performance enhancement. In this work, one assembly technique is initialized to fabricate parallel nanoparticle strips by precisely tailoring the contact angle of a gold colloid on a substrate. The assembly of a nanoparticle monolayer with a close-packed pattern can be simultaneously switched on and off by independently varying the contact angle across a threshold value of 4.2~. This nanoparticle strip shows a reversible and reliable electrical response even if a mechanical strain as small as 0.027% is periodically supplied, implying well-controlled electron tunneling between the adjacent nanoparticles. 展开更多
关键词 convective assembly strain gauge contact angle gold nanoparticles
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Contracted interlayer distance in graphene/sapphire heterostructure
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作者 Shiro Entani Liubov Yu. Antipina +8 位作者 Pavel V. Avramov Manabu Ohtomo Yoshihiro Matsumoto Norie Hirao Iwao Shimoyama Hiroshi Naramoto Yuji Baba Pavel B. Sorokin Seiji Sakai 《Nano Research》 SCIE EI CAS CSCD 2015年第5期1535-1545,共11页
Direct growth of graphene on insulators is expected to yield significant improvements in performance of graphene-based electronic and spintronic devices. In this study, we successfully reveal the atomic arrangement an... Direct growth of graphene on insulators is expected to yield significant improvements in performance of graphene-based electronic and spintronic devices. In this study, we successfully reveal the atomic arrangement and electronic properties of a coherent heterostructure of single-layer graphene and α-Al2O3(0001). The analysis of the atomic arrangement of single-layer graphene on α-Al2O3(0001) revealed an apparentcontradiction. The in-plane analysis shows that single-layer graphene grows not in a single-crystalline epitaxial manner, but rather in polycrystalline form, with two strongly pronounced preferred orientations. This suggests relatively weak interfacial interactions are operative. However, we demonstrate that unusually strong physical interactions between graphene and α-Al2O3(0001) exist, as evidenced by the small separation between the graphene and the α-Al2O3(0001) surface. The interfacial interaction is shown to be dominated by the electrostatic forces involved in the graphene n-system and the unsaturated electrons of the topmost O layer of α-Al2O3(0001), rather than the van der Waals interactions. Such features causes graphene hole doping and enable the graphene to slide on the α-Al2O3(0001) surface with only a small energy barrier despite the strong interfacial interactions. 展开更多
关键词 GRAPHENE SAPPHIRE chemical vapor deposition graphene/insulator interface
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Breaking the periodic arrangement of atoms for the enhanced electrochemical reduction of nitrogen and water oxidation 被引量:1
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作者 Shilong Jiao Xianwei Fu +2 位作者 Shuangchen Ruan Yu-Jia Zeng Hongwen Huang 《Science China Materials》 SCIE EI CAS CSCD 2022年第1期147-154,共8页
The development of cost-effective and highperformance electrocatalysts has been increasingly studied to mitigate upcoming energy and environmental challenges.Amorphization and heterointerface engineering have played s... The development of cost-effective and highperformance electrocatalysts has been increasingly studied to mitigate upcoming energy and environmental challenges.Amorphization and heterointerface engineering have played significant roles in the rational design of electrocatalysts and modulation of their electrocatalytic activities.However,the synergistic effect between amorphization and heterointerfaces has been scarcely reported.As a proof-of-concept attempt,we develop amorphous FeMo(a-FeMo)electrocatalysts with an abundance of heterointerfaces that are composed of amorphous components and evaluate their electrocatalytic performances toward the nitrogen reduction reaction and oxygen evolution reaction(OER).Benefitting from the synergistic effect between the amorphous nature of the a-FeMo electrocatalysts,which offer a high density of active sites,and significant electron redistribution at the heterointerfaces,the electrocatalysts exhibit a high Faradaic efficiency of 29.15%,an elevated yield rate of 71.78μg_(NH_(3)) mg_(cat.)^(-1) h^(-1) with long-term stability at a potential of-0.1V vs.reversible hydrogen electrode and excellent electrocatalytic activity toward the OER.This study provides a promising and effective method for the rational design of low-cost heterogeneous catalysts with desirable efficiency,selectivity,and stability. 展开更多
关键词 amorphism and heterointerface nitrogen reduction reaction OER electrocatalyst design electrocatalytic conversion
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