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Superconductivity in potassium and ammonia co-intercalated FeSe1-xTex
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作者 BinBin Xiao NaiZhou Wang +4 位作者 Chao Shang FanBao Meng JianWen Ding Bin Lei XiGang Luo 《中国科学:物理学、力学、天文学英文版》 SCIE EI CAS CSCD 2019年第4期84-90,共7页
The origin of the ~40 and ~30 K superconducting phases in the metal-intercalated FeSe superconductors is still unclear. We report the synthesis of K0.3(NH3)y(FeSe1-xTex)2 and K0.6(NH3)y(FeSe1-xTex)2 with x=0-0.6 by us... The origin of the ~40 and ~30 K superconducting phases in the metal-intercalated FeSe superconductors is still unclear. We report the synthesis of K0.3(NH3)y(FeSe1-xTex)2 and K0.6(NH3)y(FeSe1-xTex)2 with x=0-0.6 by using the liquid ammonia method at room temperature. The superconducting transition temperature Tcof the former remains about 43 K for all the nominal Te content less than 0.3, while that of the latter is about 30 K and obviously decreases with Te doping. Superconductivity disappears for x ≥0.4 in both systems. Except for the different chemical pressure induced by substitution of Te for Se in both systems, we also observed distinct external pressure effect on superconductivity for both systems, with much more efficiency of suppressing Tcby external pressure in the former system. These dramatic differences of both chemical and external pressure effects on Tc between the ~30 and ~40 K superconducting phases revealed that the existence of the two superconducting phases can be ascribed to the moderate and negligible coupling between FeSe layers, respectively. 展开更多
关键词 PNICTIDES and CHALCOGENIDES properties of SUPERCONDUCTORS effects of pressure methods of MATERIALS synthesis and MATERIALS processing
Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure
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作者 Suzana FILIPOVIC Vera P.PAVLOVIC +5 位作者 Miodrag MITRIC Steva LEVIC NebojCa MITROVIC Aleksa MARICIC Branislav VLAHOVIC Vladimir B.PAVLOVIC 《先进陶瓷(英文版)》 CSCD 2019年第1期133-147,共15页
Multiferroic materials attracted a lot of attention in recent years because of their significant scientific interest and technological applications. The multiferroic core/shell powders have a better connectivity betwe... Multiferroic materials attracted a lot of attention in recent years because of their significant scientific interest and technological applications. The multiferroic core/shell powders have a better connectivity between the phases, resulting in superior dielectric and magneto electric properties. In this study, the influence of preparation condition on structure and properties of BaTiO3/α-Fe2 O3 core/shell composite materials was examined. The five samples were obtained by varying synthesis conditions, such as synthesized method(co-precipitation and sonochemical method) and pH values of solution. XRD and Raman spectroscopy analyses were performed in order to determine phase composition and structural changes within samples. Morphology modifications were examined by SEM and EDS analyses. Finally, effect of structural and microstructural changes on magnetic and electrical properties was detected and explained. 展开更多
关键词 ceramics electronic MATERIALS magnetic MATERIALS RAMAN spectroscopy X-ray diffraction(XRD) FERROELECTRICITY
High-throughput experiments facilitate materials innovation:A review
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作者 LIU YiHao HU ZiHeng +5 位作者 SUO ZhiGuang HU LianZhe FENG LingYan GONG XiuQing LIU Yi ZHANG JinCang 《中国科学:技术科学英文版》 SCIE EI CAS CSCD 2019年第4期521-545,共25页
Since the Material Genome Initiative(MGI)was proposed,high-throughput based technology has been widely employed in various fields of materials science.As a theoretical guide,material informatics has been introduced ba... Since the Material Genome Initiative(MGI)was proposed,high-throughput based technology has been widely employed in various fields of materials science.As a theoretical guide,material informatics has been introduced based on machine learning and data mining and high-throughput computation has been employed for large scale search,narrowing down the scope of the experiment trials.High-throughput materials experiments including synthesis,processing,and characterization technologies have become valuable research tools to pin down the prediction experimentally,enabling the discovery-to-deployment of advances materials more efficiently at a fraction of cost.This review aims to summarize the recent advances of high-throughput materials experiments and introduce briefly the development of materials design based on material genome concept.By selecting representative and classic works in the past years,various high-throughput preparation methods are introduced for different types of material gradient libraries,including metallic,inorganic materials,and polymers.Furthermore,high-throughput characterization approaches are comprehensively discussed,including both their advantages and limitations.Specifically,we focus on high-throughput mass spectrometry to analyze its current status and challenges in the application of catalysts screening. 展开更多
关键词 MATERIAL GENOME Initiative(MGI) HIGH-THROUGHPUT MATERIAL development MATERIALS synthesis MATERIALS characterization
基于光子晶体的红外隐身材料研究进展
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作者 卢仪 卜小海 +2 位作者 李栋先 刘飞佑 张泽武 《激光与光电子学进展》 CSCD 北大核心 2019年第8期24-33,共10页
光子晶体是由多种具有不同介电常数的介质材料在空间按一定的周期排列所形成的一种人造结构晶体,其光子禁带对入射电磁波具有高反射率,能够有效改变目标的辐射特性。基于光子晶体的红外隐身材料的研究是当前红外隐身技术的研究热点之一... 光子晶体是由多种具有不同介电常数的介质材料在空间按一定的周期排列所形成的一种人造结构晶体,其光子禁带对入射电磁波具有高反射率,能够有效改变目标的辐射特性。基于光子晶体的红外隐身材料的研究是当前红外隐身技术的研究热点之一。对光子晶体的结构及特性等方面进行了详细介绍,系统综述了光子晶体材料在红外隐身方面的应用现状,并对新型红外光子晶体材料的研究进行了展望,以期为光子晶体红外隐身材料在宽频隐身、多波段兼容、带隙可调等领域的需求提供一定的解决思路。 展开更多
关键词 材料 隐身材料 光子晶体 光子带隙 红外发射率
Research progress in lead-less or lead-free three-dimensional perovskite absorber materials for solar cells 预览
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作者 Huan-yu Zhang Rui Li +2 位作者 Wen-wu Liu Mei Zhang Min Guo 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2019年第4期387-403,共17页
The trend toward lead-free or lead-less perovskite solar cells(PSCs)has attracted increasing attention over the past few years because the toxicity of lead(Pb)is one of the substantial restrictions for large-scale app... The trend toward lead-free or lead-less perovskite solar cells(PSCs)has attracted increasing attention over the past few years because the toxicity of lead(Pb)is one of the substantial restrictions for large-scale applications.Researchers have investigated the viability of substituting Pb with other elements(group 14 elements,group 2 elements,transition-metal elements,and group 13 and 15 elements)in the three-dimensional(3D)perovskites by theoretical calculations and experimental explorations.In this paper,recent research progress in Pb-less and Pb-free PSCs on the perovskite compositions,deposition methods,and device structures are summarized and the main problems that hinder the enhancement of device efficiency and stability are discussed in detail.To date,the fully Sn-based PSCs have shown a power conversion efficiency(PCE)of 8.12%and poor device stability.However,lead-less PSCs have shown higher PCE and a better stability.In addition,the introduction of double-perovskite materials also draws researchers’attention.We believe that the engineering of elemental composition,perovskite deposition methods,and interfacial modification are critical for the future development of Pb-less and Pb-free PSCs. 展开更多
关键词 PEROVSKITE solar cells LEAD-FREE PEROVSKITE MATERIALS lead-less PEROVSKITE MATERIALS composition engineering stability
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V2O5·nH2O nanosheets and multi-walled carbon nanotube composite as a negative electrode for sodium-ion batteries 预览
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作者 Ahmed S. Etman Junliang Sun Reza Younesi 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第3期145-151,共7页
Two dimensional (2D) transition metal oxides and chalcogenides demonstrate a promising performance in sodium-ion batteries (SIBs) application. In this study, we investigated the use of a composite of freeze dried V2O5... Two dimensional (2D) transition metal oxides and chalcogenides demonstrate a promising performance in sodium-ion batteries (SIBs) application. In this study, we investigated the use of a composite of freeze dried V2O5·nH2O nanosheets and multi-walled carbon nanotube (MWCNT) as a negative electrode mate-rial for SIBs. Cyclic voltammetry (CV) results indicated that a reversible sodium-ion insertion/deinsertion into the composite electrode can be obtained in the potential window of 0.1–2.5 V vs. Na+/Na. The com-posite electrodes delivered sodium storage capacities of 140 and 45 mAh g^-1 under applied current den-sities of 20 and 100 mA g^-1, respectively. The pause test during constant current measurement showed a raise in the open circuit potential (OCP) of about 0.46 V, and a charge capacity loss of ~10%. These val-ues are comparable with those reported for hard carbon electrodes. For comparison, electrodes of freeze dried V2O5·nH2O nanosheets were prepared and tested for SIBs application. The results showed that the MWCNT plays a significant role in the electrochemical performance of the composite material. 展开更多
关键词 Sodium-ion batteries ANODE MATERIALS VANADIUM pentoxide NANOSHEETS Composite MATERIALS
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MATERIALS AND METHODS 预览
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《水稻科学:英文版》 CSCD 2019年第3期I0006-I0007,共2页
Rice germplasm A total of 208 indica P/TGMS lines were selected for analysis from the National Mid-term Genebank for Rice, Hangzhou, China (Supplemental Table 2), and 100 typical indica and 100 japonica accessions to ... Rice germplasm A total of 208 indica P/TGMS lines were selected for analysis from the National Mid-term Genebank for Rice, Hangzhou, China (Supplemental Table 2), and 100 typical indica and 100 japonica accessions to identify the indica/japonica component of them were also from the National Mid-term Genebank for Rice, Hangzhou, China (Supplemental Table 5). 展开更多
关键词 MATERIALS METHODS RICE
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An electrodeposition approach to metal/metal oxide heterostructures for active hydrogen evolution catalysts in near-neutral electrolytes
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作者 Michael J.Kenney Jianan Erick Huang +9 位作者 Yong Zhu Yongtao Meng Mingquan Xu Guanzhou Zhu Wei-Hsuan Hung Yun Kuang Mengchang Lin Xiaoming Sun Wu Zhou Hongjie Dai 《纳米研究:英文版》 SCIE EI CAS CSCD 2019年第6期1431-1435,共5页
Neutral water splitting is attractive for its use of non-corrosive and environmentally friendly electrolytes.However,catalyst development for hydrogen and oxygen evolution remains a challenge under neutral conditions.... Neutral water splitting is attractive for its use of non-corrosive and environmentally friendly electrolytes.However,catalyst development for hydrogen and oxygen evolution remains a challenge under neutral conditions.Here we report a simple electrodeposition and reductive annealing procedure to produce a highly active Ni-Co-Cr metal/metal oxide heterostructured catalyst directly on Ni foam.The resulting electrocatalyst for hydrogen evolution reaction (HER) requires only 198 mV of overpotential to reach 100 mNcm2 in 1 M potassium phosphate (pH =7.4) and can operate for at least two days without significant performance decay.Scanning transmission electron microscopy coupled with electron energy loss spectroscopy (STEM-EELS) imaging reveals a Ni-Co alloy core decorated with blended oxides layers of NiO,CoO and Cr2O3.The metal/metal oxide interfaces are suggested to be responsible for the high HER activity. 展开更多
关键词 water SPLITTING CATALYSIS NANOSTRUCTURED materials hydrogen EVOLUTION chemical mapping
Micro/nano-scale Characterization and Fatigue Fracture Resistance of Mechanoreceptor with Crack-shaped Slit Arrays in Scorpion
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作者 Kejun Wang Junqiu Zhang +4 位作者 Yuqiang Fang Daobing Chen Linpeng Liu Zhiwu Han Luquan Ren 《仿生工程学报:英文版》 SCIE EI CSCD 2019年第3期410-422,共13页
The nocturnal scorpion Heterometrus petersii uses Basitarsal Compound Slit Sensilla (BCSS) as mechanoreceptor to detect mechanical signal (e.g. substrate vibration, cyclic loads caused by walking) without fatigue fail... The nocturnal scorpion Heterometrus petersii uses Basitarsal Compound Slit Sensilla (BCSS) as mechanoreceptor to detect mechanical signal (e.g. substrate vibration, cyclic loads caused by walking) without fatigue failure such as initiation of fatigue crack and further propagation of crack-shaped slit. The outstanding perceptive function has been discovered for over half a century. However, it is not yet clear about the microstructure, material composition and micromechanical property which are all important factors that determine the fatigue fracture resistance of the BCSS. Here, the microscopic characteristics of the BCSS were thoroughly studied. The results dicate that anti-fatigue resilin and stiff chitinous cuticle form multilayered composite as the main body of the BCSS. Meanwhile, the pre-existing slit as mechanosensory structure is covered by cuticular membrane which has different mechanical property with the epicuticle. Theoretical analysis shows that the structure-composition-property synergistic relations of composites confer on the BCSS with extreme fatigue fracture tolerance. 展开更多
关键词 slit-based mechanoreceptor materials CHARACTERIZATION MULTILAYERED composite resilin fatigue fracture RESISTANCE
Joining Performance and Microstructure of the 2024/7075 Aluminium Alloys Welded Joints by Vaporizing Foil Actuator Welding
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作者 MENG Zhenghua WANG Xu +4 位作者 GUO Wei HU Zhili Anupam Vivek HUA Lin Glenn S DAEHN 《武汉理工大学学报:材料科学英文版》 SCIE EI CAS 2019年第2期368-372,共5页
Vaporizing foil actuator welding(VFAW) was used for joining 2024-T3 and 7075-T6 aluminum alloy sheets, and the resulting joint microstructure was analyzed. 2024/7075 aluminum alloy pairs with suitable processing param... Vaporizing foil actuator welding(VFAW) was used for joining 2024-T3 and 7075-T6 aluminum alloy sheets, and the resulting joint microstructure was analyzed. 2024/7075 aluminum alloy pairs with suitable processing parameters can be prepared by using VFAW. Dynamic preform addresses the poor formability problem of target material and advantage of VFAW on dissimilar materials in some conditions. But with standoff sheet inserting in the flyer and target, 2024/7075 welded pairs gets the better weld strength, compared with flyer preformed method. The microstructure of the circular weld area of the welded joint showed a wave interface, in which a thin melt layer formed at the center and edge parts. The crystal grains near the bonding interface were remarkably elongated and refined. Therefore, the joining of the 2024/7075 pairs was facilitated through plastic forming and melting. 展开更多
关键词 impact WELDING dissimilar materials vaporizing FOIL ACTUATOR joining interface
全电介质纳米颗粒的制造及其应用
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作者 马浩 赵元安 邵建达 《激光与光电子学进展》 CSCD 北大核心 2019年第9期33-44,共12页
论述了全电介质纳米颗粒的光学性质,介绍了全电介质纳米颗粒的制备方法,分析了各种制备方法的优缺点,回顾了全电介质纳米颗粒在高折射率纳米谐振器、光学纳米天线、超材料和超表面、非线性纳米光子学等方面的应用,给出了全电介质纳米颗... 论述了全电介质纳米颗粒的光学性质,介绍了全电介质纳米颗粒的制备方法,分析了各种制备方法的优缺点,回顾了全电介质纳米颗粒在高折射率纳米谐振器、光学纳米天线、超材料和超表面、非线性纳米光子学等方面的应用,给出了全电介质纳米颗粒的研究重点及发展方向。 展开更多
关键词 材料 全电介质纳米颗粒 电磁响应 介电常数 磁导率
Ti811表面激光熔覆复合涂层的微观组织及摩擦磨损性能
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作者 刘亚楠 孙荣禄 +2 位作者 牛伟 张天刚 谭金花 《中国激光》 EI CAS CSCD 北大核心 2019年第1期157-165,共9页
通过激光熔覆技术在Ti811钛合金表面制备了Ti基复合涂层,研究了涂层的物相组成、微观组织、显微硬度及摩擦磨损性能,分析了TiB2-TiC复合镶嵌结构的形成机理。结果表明:涂层主要由增强相TiC和TiB2、金属间化合物Ti2Ni以及基底α-Ti组成;T... 通过激光熔覆技术在Ti811钛合金表面制备了Ti基复合涂层,研究了涂层的物相组成、微观组织、显微硬度及摩擦磨损性能,分析了TiB2-TiC复合镶嵌结构的形成机理。结果表明:涂层主要由增强相TiC和TiB2、金属间化合物Ti2Ni以及基底α-Ti组成;TiB2的(0001)面和TiC的(111)面之间的错配度仅为1.057%,TiB2可以作为TiC最有效的异质形核的核心,形成TiB2-TiC复合结构;弥散强化、固溶强化和细晶强化效应使得涂层的显微硬度可达617HV,为Ti811钛合金的1.62倍;涂层具有良好的摩擦磨损性能,磨损体积、磨损深度和平均摩擦因数分别为175×10-3 mm3、80.13μm和0.39,磨损体积较基体约下降了26%。 展开更多
关键词 材料 激光熔覆 Ti811钛合金 微观组织 错配度 显微硬度 耐磨损性能
Tracing of dye molecules in living plants through NaGdF4:Yb3+,Er3+fluorescent nanoprobes
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作者 Xiaofeng Wu Ya’nan Zhang +9 位作者 Shiping Zhan Jin Li Guozheng Nie Shigang Hu Cong Yan Shaobing Wu Shengbin Cheng Junshan Hu Lichun Shi Yunxin Liu 《中国稀土学报:英文版》 SCIE EI CAS CSCD 2019年第3期237-241,共5页
In this paper, we demonstrated trace of dye molecules in living plants. The NaGdF4:Yb3+,Er3+ nanoparticles probe was used to detect the rhodamine B(RhB) in bean sprout. It is found that the fluorescencedye can be effi... In this paper, we demonstrated trace of dye molecules in living plants. The NaGdF4:Yb3+,Er3+ nanoparticles probe was used to detect the rhodamine B(RhB) in bean sprout. It is found that the fluorescencedye can be efficiently imbibed during the growing process and the absorbance presented a position dependence effect, which was supported by the upconversion spectra and the fluorescent image characterization. In addition, the concentration of the residual RhB in bean sprout can be efficiently traced by the synthesized probe based on the fluorescent resonant energy transfer. Finally, the relation between the excitation power, concentration and the ratio of yellow to green emission are discussed in detail. These results can be helpful in understanding the RhB dye molecules absorbance process in vegetable growth and provide an efficient way to trace the residual dyes in vivo plant. 展开更多
关键词 Rare-earth-doped materials Biological sensing and SENSORS Fluorescence Luminescence UPCONVERSION NANOPROBES
浅析电厂基建物资全过程质量管理探析 预览
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作者 肖宏 《水电科技》 2019年第1期91-92,共2页
伴随着市场经济制度的不断完善,各行各业都得到了快速发展,其中,电力方面作为最能贴近人们的行业,也进行了创新与完善。现如今,我国电力基建单位在发展的过程中,对物资的质量管理格外重视,并在严格规范,降低工程造价的基础上,从根本上... 伴随着市场经济制度的不断完善,各行各业都得到了快速发展,其中,电力方面作为最能贴近人们的行业,也进行了创新与完善。现如今,我国电力基建单位在发展的过程中,对物资的质量管理格外重视,并在严格规范,降低工程造价的基础上,从根本上促进电厂企业的发展。主要阐述了电厂基建物资全过程的管理工作,并且提出相关的措施进行解决,在通过对招标物资的计划管理、采购管理以及设备管理中提高电厂基建物资质量管理效果。 展开更多
关键词 电厂基建 物资 管理工作
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Analysis of optical properties of bio-smoke materials in the 0.25–14 μm band
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作者 赵欣颖 胡以华 +4 位作者 顾有林 陈曦 王新宇 王鹏 董骁 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第3期168-174,共7页
At present, research into optical properties of bio-smoke materials mostly concentrates on single band or single germplasm. Herein, we measured the spectral reflectance of three eukaryotic bio-smoke materials and thre... At present, research into optical properties of bio-smoke materials mostly concentrates on single band or single germplasm. Herein, we measured the spectral reflectance of three eukaryotic bio-smoke materials and three prokaryotic bio-smoke materials in the waveband from 0.25 μm to 14μm. Based on the Kramers-Kroning algorithm, the complex refractive index m(λ) was calculated and the Fourier-transform infrared(FTIR) spectra of materials were analyzed. The results show that n(λ) of bio-smoke materials varies between 1.1-2, and n(λ) values in the visible light to near-infrared wavebands are significantly larger than those in other wavebands. The k(λ) of bio-smoke materials varies between 0-0.4.At 6-6.5 μm, k(λ) of prokaryotic materials is 3 times that of eukaryotic materials, which is caused by C=O stretching vibration of amide I and C-N stretching vibration of amide Ⅱ in proteins. At 2.5-3 μm and 9.75 μm, k(λ) values of eukaryotic bio-smoke materials are nearly 2 times that of prokaryotic ones. The absorption peak at 2.5-3 μm is mainly triggered by C-H stretching vibration in lipid and O-H stretching vibration in bound water. The absorption peak at 9.75 μm is mainly caused by symmetric stretching vibration of PO2-in nucleic acids. 展开更多
关键词 bio-smoke MATERIALS complex refractive index EUKARYOTIC PROKARYOTIC
Metal-organic framework based nanomaterials for electrocatalytic oxygen redox reaction
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作者 Kexin Zhang Wenhan Guo +1 位作者 Zibin Liang Ruqiang Zou 《中国科学:化学英文版》 SCIE EI CAS CSCD 2019年第4期417-429,共13页
Due to the severe environmental issues,many advanced technologies,typically fuel cells and metal-air batteries have aroused widespread concerns and been intensively studied in recent years.However,oxygen redox reactio... Due to the severe environmental issues,many advanced technologies,typically fuel cells and metal-air batteries have aroused widespread concerns and been intensively studied in recent years.However,oxygen redox reactions including oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)as the core reactions suffer from sluggish kinetics of the multiple electron transfer process.Currently,Pt,RuO2,and IrO2 are considered to be the benchmark catalysts for ORR and OER,but their high price,scarcity and instability hinder them from large-scale application.To overcome these limits,exploring alternative electrocatalysts with low cost,high activity,long-term stability,and earth-abundance is of extreme urgency.Metal-organic frameworks(MOFs)are a family of inorganic-organic hybrid materials with high surface areas and tunable structures,making them proper as catalyst candidates.Herein,the recent progress of MOFs and MOF-derived materials for ORR and OER is systematically reviewed,and the relationship between compositions and electrochemical performance is discussed.It is expected that this review can be helpful for the future development of related MOF-based materials with excellent electrochemical performance. 展开更多
关键词 METAL-ORGANIC frameworks OXYGEN evolution REACTION OXYGEN reduction REACTION earth-abundant materials ELECTROCATALYSIS NANOMATERIALS
强辐照下光子晶体红外隐身薄膜的隐身特性
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作者 刘瑞煌 时家明 +2 位作者 赵大鹏 张继魁 刘志伟 《激光与光电子学进展》 CSCD 北大核心 2019年第3期227-233,共7页
分别将光子晶体薄膜、红外隐身涂层和普通迷彩布作为待测样品贴在60℃热源上,并置于室外环境进行红外隐身实验。研究结果表明,太阳光对光子晶体薄膜8~14μm波段隐身效果影响较小,在绝大部分角度范围内,对3~5μm波段隐身效果影响也较小;... 分别将光子晶体薄膜、红外隐身涂层和普通迷彩布作为待测样品贴在60℃热源上,并置于室外环境进行红外隐身实验。研究结果表明,太阳光对光子晶体薄膜8~14μm波段隐身效果影响较小,在绝大部分角度范围内,对3~5μm波段隐身效果影响也较小;墙壁和大气辐射对光子晶体薄膜3~5μm和8~14μm波段隐身效果影响都较小。光子晶体薄膜在中、远红外双波段隐身效果优于另外两种传统红外隐身材料。 展开更多
关键词 材料 光子晶体 红外隐身 太阳辐照 墙面辐射 辐射温度
径向偏振光激发氧化石墨烯/金纳米棒复合基底的表面增强拉曼散射性能
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作者 杨东 聂仲泉 +2 位作者 翟爱平 田彦婷 贾宝华 《光学学报》 EI CAS CSCD 北大核心 2019年第6期398-407,共10页
探究径向偏振矢量光与氧化石墨烯/金纳米棒复合结构的相互作用,以提高表面增强拉曼散射性能。基于FDTD Solutions软件,得到氧化石墨烯/单金纳米棒复合基底在径向偏振光激发下的表面增强拉曼散射增强因子达到10~8,比相同条件下线偏振光... 探究径向偏振矢量光与氧化石墨烯/金纳米棒复合结构的相互作用,以提高表面增强拉曼散射性能。基于FDTD Solutions软件,得到氧化石墨烯/单金纳米棒复合基底在径向偏振光激发下的表面增强拉曼散射增强因子达到10~8,比相同条件下线偏振光激发的大6个数量级。这种性能提高的物理机制源于径向偏振光激发金纳米棒的电磁增强与氧化石墨烯产生的本征化学增强。进一步详细讨论了径向偏振光激发下氧化石墨烯厚度、金纳米棒数量和排列方式对表面增强拉曼散射性能的影响。基于径向矢量光场激发多功能基底的表面增强拉曼散射性能调控在生物化学、食品安全与传感检测等领域具有巨大的应用潜力。 展开更多
关键词 材料 表面增强拉曼散射 氧化石墨烯/金纳米棒复合基底 FDTD Solutions软件 径向偏振光
Photocatalytic degradation of environmental perilous gentian violet dye using leucaena-mediated zinc oxide nanoparticle and its anticancer activity
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作者 Krishnaswamy Kanagamani Pitchaipillai Muthukrishnan +2 位作者 Karunamoorthy Saravanakumar Karikalan Shankar Ayyasami Kathiresan 《稀有金属:英文版》 SCIE EI CAS CSCD 2019年第4期277-286,共10页
Phytomediated synthesis of metal oxide nanoparticles has become a key research area in nanotech no logy due to its wide applicability in various biomedical fields. The present work explores the biosynthesis of zinc ox... Phytomediated synthesis of metal oxide nanoparticles has become a key research area in nanotech no logy due to its wide applicability in various biomedical fields. The present work explores the biosynthesis of zinc oxide nanoparticles (ZnO-NPs) using Leucaena leucocephala leaf extract. The synthesised ZnO-NPs were characterised by ultraviolet-visible (UV-Vis) spectroscopy, seanning electron microscopy (SEM), energydispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR). X-ray diffraction (XRD), transmission electron microscopy (TEM) and selected area electron diffraction (SAED) studies. Biosynthesised ZnONPs are found to have wurtzite hexagonal structure with particles distributed in the range of 50-200 nm as confirmed by TEM studies. The anticancer activity of ZnONPs against MCF-7 (breast cancer) and PC-3 (human prostate cancer) cell lines was evaluated using 3-(4, 5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. From the assay, biosynthesised ZnO-NPs have better cytotoxic activity on PC-3 cell lines than MCF- 7 cell lines. The in vitro cytotoxicity studies of biosynthesised ZnO-NPs against Dalton lymphoma ascites (DLA) cells reveal better “ntitunior activity of 92% inhibition with concentration of 200μg ·ml^-1 of ZnO-NPs, and as the concentration increases, the anticancer efficiency as well increases, and also, it has excellent photocatalytic activity to degrade crystal violet dye in aqueous solution after irradiation of 90 min. The result suggests that the green synthesis of ZnO-NPs could be easily recovered and reused several times without any significant loss of the catalytic activity. The advantage of this technique lies in its low cost, easily clinibable and non-use of toxic agents. 展开更多
关键词 Nano STRUCTURED materials Catalysis Sea nning electron microscopy X-ray DIFFRACTION
Li-ion battery material under high pressure: amorphization and enhanced conductivity of Li4Ti5O12
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作者 Yanwei Huang Yu He +11 位作者 Howard Sheng Xia Lu Haini Dong Sudeshna Samanta Hongliang Dong Xifeng Li Duck Young Kim Ho-kwang Mao Yuzi Liu Heping Li Hong Li Lin Wang 《国家科学评论:英文版》 CSCD 2019年第2期239-246,共8页
Lithium titanium oxide(Li4Ti5O12,LTO),a‘zero-strain’anode material for lithium-ion batteries,exhibits excellent cycling performance.However,its poor conductivity highly limits its applications.Here,the structural st... Lithium titanium oxide(Li4Ti5O12,LTO),a‘zero-strain’anode material for lithium-ion batteries,exhibits excellent cycling performance.However,its poor conductivity highly limits its applications.Here,the structural stability and conductivity of LTO were studied using in situ high-pressure measurements and first-principles calculations.LTO underwent a pressure-induced amorphization(PIA)at 26.9 GPa.The impedance spectroscopy revealed that the conductivity of LTO improved significantly after amorphization and that the conductivity of decompressed amorphous LTO increased by an order of magnitude compared with its starting phase.Furthermore,our calculations demonstrated that the different compressibility of the Li O6 and Ti O6 octahedra in the structure was crucial for the PIA.The amorphous phase promotes Li+ diffusion and enhances its ionic conductivity by providing defects for ion migration.Our results not only provide an insight into the pressure depended structural properties of a spinel-like material,but also facilitate exploration of the interplay between PIA and conductivity. 展开更多
关键词 high pressure PRESSURE-INDUCED amorphization LITHIUM-ION battery materials IONIC CONDUCTIVITY
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