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文章速递Energy law preserving continuous finite element schemes for a gas metal arc welding system 认领
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作者 Yanhai Lin Yongyue Jiang 《理论物理通讯:英文版》 SCIE CAS CSCD 2021年第2期30-40,共11页
In this paper a modifed continuous energy law was explored to investigate transport behavior in a gas metal arc welding(GMAW)system.The energy law equality at a discrete level for the GMAW system was derived by using ... In this paper a modifed continuous energy law was explored to investigate transport behavior in a gas metal arc welding(GMAW)system.The energy law equality at a discrete level for the GMAW system was derived by using the finite element scheme.The mass conservation and current density continuous equation with the penalty scheme was applied 10 improve the stability.According to the phase-field model coupled with the energy law preserving method,the GMAW model was discretized and a metal transfer process with a pulse current was simulated.It was found that the numerical solution agrees well with the data of the metal transfer process obtained by high-speed photography.Compared with the numerical solution of the volume of fuid model,which was widely studied in the GMAW system based on the finite element method Euler scheme,the energy law preserving method can provide better accuracy in predicting the shape evolution of the droplet and with a greater computing efficiency. 展开更多
关键词 phase field gas metal arc welding(GMAW) metal transfer discrete energy law finite element method numerical solution
文章速递Cautious interpretation of coulombic efficiency(CE) in lithium metal batteries 认领
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作者 Fu Sun Dong Zhou +2 位作者 Xiaogang Wang Ingo Manke Libao Chen 《能源化学:英文版》 SCIE EI CAS CSCD 2021年第5期34-36,共3页
The soaring demand for electrical energy storage technologies stimulated by advanced portable devices, prospering electric vehicles, and large-scale grid storage applications have triggered explosive research on Li me... The soaring demand for electrical energy storage technologies stimulated by advanced portable devices, prospering electric vehicles, and large-scale grid storage applications have triggered explosive research on Li metal battery (LMB), which has been widely acknowledged as the most promising energy storage technology of the future that can break the energy-density bottleneck of the state-of-art lithium-ion battery (LIB) technology [1,2]. 展开更多
关键词 Coulombic efficiency Lithium metal anode Lithium metal battery Lithium ion battery
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文章速递In-situ surface self-reconstruction in ternary transition metal dichalcogenide nanorod arrays enables efficient electrocatalytic oxygen evolution 认领
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作者 Qiang Chen Yulu Fu +8 位作者 Jialun Jin Wenjie Zang Xiong Liu Xiangyong Zhang Wenzhong Huang Zongkui Kou John Wang Liang Zhou Liqiang Mai 《能源化学:英文版》 SCIE EI CAS CSCD 2021年第4期10-16,共7页
Water splitting has received more and more attention because of its huge potential to generate clean and renewable energy.The highly active and durable oxygen evolution reaction(OER)catalysts play a decisive factor in... Water splitting has received more and more attention because of its huge potential to generate clean and renewable energy.The highly active and durable oxygen evolution reaction(OER)catalysts play a decisive factor in achieving efficient water splitting.The identification of authentic active origin under the service conditions can prompt a more reasonable design of catalysts together with well-confined micro-/nano-structures to boost the efficiency of water splitting.Herein,Fe,Co,and Ni ternary transition metal dichalcogenide(FCND)nanorod arrays on Ni foam are purposely designed as an active and stable low-cost OER pre-catalyst for the electrolysis of water in alkaline media.The optimized FCND catalyst demonstrated a lower overpotential than the binary and unary counterparts,and a 27-fold rise in kinetic current density at the overpotential of 300 m V compared to the nickel dichalcogenide counterpart.Raman spectra and other structural characterizations at different potentials reveal that the in-situ surface self-reconstruction from FCND to ternary transition metal oxyhydroxides(FCNOH)on catalyst surfaces initiated at about 1.5 V,which is identified as the origin of OER activity.The surface selfreconstruction towards FCNOH also enables excellent stability,without fading upon the test for 50 h. 展开更多
关键词 Surface self-reconstruction Transition metal dichalcogenide Transition metal oxyhydroxide Oxygen evolution reaction Water splitting
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文章速递Visible and Near-Infrared Spectroscopy with Multi-Parameters Optimization of Savitzky-Golay Smoothing Applied to Rapid Analysis of Soil Cr Content of Pearl River Delta 认领
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作者 Xiaowen Shi Lijun Yao Tao Pan 《地球科学和环境保护期刊(英文)》 2021年第3期75-83,共9页
Using visible and near-infrared (Vis-NIR) spectroscopy combined with partial least squares (PLS) regression, the rapid reagent-free analysis model for chromium (Cr) content in tideland reclamation soil in the Pearl Ri... Using visible and near-infrared (Vis-NIR) spectroscopy combined with partial least squares (PLS) regression, the rapid reagent-free analysis model for chromium (Cr) content in tideland reclamation soil in the Pearl River Delta, China was established. Based on Savitzky-Golay (SG) smoothing and PLS regression, a multi-parameters optimization platform (SG-PLS) covering 264 modes was constructed to select the appropriately spectral preprocessing mode. The optimal SG-PLS model was determined according to the prediction effect. The selected optimal parameters <em>d, p, m</em> and LV were 2, 6, 23 and 8, respectively. Using the validation samples that were not involved in modeling, the root mean square error (SEP<sub>V</sub>), relative root mean square error (R-SEP<sub>V</sub>) and correlation coefficients (R<sub>P, V</sub>) of prediction were 11.66 mg<span style="white-space:nowrap;">&middot;</span>kg<sup>-1</sup>, 10.7% and 0.722, respectively. The results indicated that the feasibility of using Vis-NIR spectroscopy combined with SG-PLS method to analyze soil Cr content. The constructed multi-parameters optimization platform with SG-PLS is expected to be applied to a wider field of analysis. The rapid detection method has important application values to large-scale agricultural production. 展开更多
关键词 Soil Heavy Metal Chromium Visible and Near-Infrared Spectroscopy Rapid Reagent-Free Analysis Savitzky-Golay Smoothing
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Physical Alloying of Plasma Metallization Carbide Nanocomposite Coating by Allotropic Carbon Nanostructures 认领
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作者 Philipp I. Vysikaylo Valeriy S. Mitin Alexey A. Yakushkin 《表面工程材料与先进技术期刊(英文)》 2021年第1期1-13,共13页
The fundamental scientific problem for micro- and nano-electronics has been solved—methods for creating and investigating properties of physically doped materials with spatially inhomogeneous structure at the micro- ... The fundamental scientific problem for micro- and nano-electronics has been solved—methods for creating and investigating properties of physically doped materials with spatially inhomogeneous structure at the micro- and nano-meter scale have been developed. For the application of functional nanocomposite film coatings based on carbides of various transition metals structured by nanocarbon, for the first time in the world, we developed a new technique for their plasma deposition on a substrate without the use of reaction gases (hydrocarbons such as propane, acetylene, etc.). We have created nanostructured film materials, including those with increased strength and wear resistance, heterogeneous at the nanoscale, physically doped with nanostructures—quantum traps for free electrons. We learned how to simultaneously spray (in a plasma of a stationary magnetron discharge) carbides and graphite from a special mosaic target (carbide + carbon) made mechanically. As a result of such stationary sputtering of carbides and carbon, plasma nanostructured coatings were obtained from nanocarbides, metal nanocrystals and nanocarbon. Our design of such a target made it possible to intensively cool it in the magnetron body and spray its parts (carbide + carbon) simultaneously with a high power density of a constant plasma discharge—in the range of values from 40 W/cm<sup>2</sup> to 125 W/cm<sup>2</sup>. Such sputtering with a change in the power or the initial relative surface areas of various parts of the mosaic target (carbon and carbide) made it possible to change the average density of carbide, metal and carbon in a nanostructured (nanocarbon and metal nanostructures) coating. The changed relative density of various components of the nanocomposite (nanostructures of carbide, metal, and carbon in the form of graphite) significantly affected the physical properties of the nanocomposite coating. The creating method of multiphase nanostructured composite coatings (based on carbides of transition metals) with high hardness of 展开更多
关键词 Physical Alloying Plasma Metal Coating Coefficient of Dry Friction Charged Layer
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An overview of laser-based multiple metallic material additive manufacturing: from macro- to micro-scales 认领
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作者 Chao Wei Zhizhou Zhang +3 位作者 Dongxu Cheng Zhe Sun Menghui Zhu Lin Li 《极端制造(英文)》 EI 2021年第1期46-69,共24页
Additive manufacturing(AM)is an emerging customized three-dimensional(3D)functional product fabrication technology.It provides a higher degree of design freedom,reduces manufacturing steps,cost and production cycles.H... Additive manufacturing(AM)is an emerging customized three-dimensional(3D)functional product fabrication technology.It provides a higher degree of design freedom,reduces manufacturing steps,cost and production cycles.However,existing metallic component 3D printing techniques are mainly for the manufacture of single material components.With the increasing commercial applications of AM technologies,the need for 3D printing of more than one type of dissimilar materials in a single component increases.Therefore,investigations on multi-material AM(MMAM)emerge over the past decade.Lasers are currently widely used for the AM of metallic components where high temperatures are involved.Here we report the progress and trend in laser-based macro-and micro-scale AM of multiple metallic components.The methods covered in this paper include laser powder bed fusion,laser powder directed energy deposition,and laser-induced forward transfer for MMAM applications.The principles and process/material characteristics are described.Potential applications and challenges are discussed.Finally,future research directions and prospects are proposed. 展开更多
关键词 LASER multi-materials metal MACRO micro laser powder bed fusion laser metal deposition laser-induced forward transfer
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Trace Metal Elements (Pb, Cd and As), 15N Nitrogen and Phosphorus Isotopes Accumulation in Three Varieties of Tomato from Conventional and Agro-Ecological Farming Systems in Burkina Faso 认领
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作者 Christophe Dabiré Abdoulaye Sérémé +3 位作者 Hermann Panandtigri Abdoudramane Sanou W. D. B. Aimée Guissou Mamoudou H. Dicko 《食品与营养科学(英文)》 2021年第2期194-205,共12页
Tomato is a market gardening product that plays an important nutritional and economic role in Burkina Faso. However, the bad use of pesticides for its production could have negative impacts </span><span style... Tomato is a market gardening product that plays an important nutritional and economic role in Burkina Faso. However, the bad use of pesticides for its production could have negative impacts </span><span style="font-family:Verdana;">consumers’</span><span style="font-family:Verdana;"> health. The objective of the present study was to assess the concentration of trace metal elements (Pb, Cd </span><span style="font-family:Verdana;">and</span><span style="font-family:Verdana;"> As), 15N isotopes (</span></span><span style="font-family:Verdana;">NO<sub>2</sub><sup style="margin-left:-7px;">-</sup></span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> NO<sub>3</sub><sup style="margin-left:-7px;">-</sup></span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> NH<sub>4</sub><sup style="margin-left:-7px;">+</sup></span><span style="font-family:Verdana;">) and phosphorus (</span><span style="font-family:Verdana;">PO<sub>4</sub><sup style="margin-left:-7px;">2-</sup></span><span style="font-family:""><span style="font-family:Verdana;">) in tomatoes according to cultivation practices. Thus, three tomato varieties (Mon</span><span><span style="font-family:Verdana;">gal F1, F1 Cobra 26 </span><span style="font-family:Verdana;">and</span><span style="font-family:Verdana;"> Roma F1) were grown using organic and conventional production methods on 2 sites at Nongr Massom, (commune of Kadiogo province). The trace metal el</span></span><span style="font-family:Verdana;">ements were analyzed using atomic absorption spectrophotometry, the isotopes 15N (</span></span><span style="font-family:Verdana;">NO<sub>2</sub><sup style="margin-left:-7px;">-</sup></span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> NO<sub>3</sub><sup style="margin-left:-7px;">-</sup></span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> NH<sub>4</sub><sup style="margin-left:-7px;">+</sup></span><span style="font-family:Verdana;">) and pho 展开更多
关键词 TOMATO Metal Trace Farming Practices
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Interface issues of lithium metal anode for high-energy batteries: Challenges, strategies, and perspectives 认领
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作者 Yiyao Han Bo Liu +6 位作者 Zhen Xiao Wenkui Zhang Xiuli Wang Guoxiang Pan Yang Xia Xinhui Xia Jiangping Tu 《信息材料》 SCIE CAS 2021年第2期155-174,共20页
Lithium(Li)metal is considered as one of the most promising anode materials for next-generation high-energy-density storage systems.However,the practical application of Li metal anode is hindered by interfacial instab... Lithium(Li)metal is considered as one of the most promising anode materials for next-generation high-energy-density storage systems.However,the practical application of Li metal anode is hindered by interfacial instability and air instability due to the highly reactivity of Li metal.Unstable interface in Li metal batteries(LMBs)directly dictates Li dendrite growth,“dead Li”and low Coulombic efficiency,resulting in inferior electrochemical performance of LMBs and even safety issues.In addition,its sensitivity to ambient air leads to the severe corrosion of Li metal anode,high requirements of production and storage,and increased manufacturing cost.Plenty of efforts in recent years have overcome many bottlenecks in these fields and hastened the practical applications of high-energy-density LMBs.In this review,we focus on emerging methods of these two aspects to fulfill a stable and low cost electrode.In this perspective,design artificial solid electrolyte interphase(SEI)layers,construct three-dimensional conductive current collectors,optimize electrolytes,employ solid-state electrolytes,and modify separators are summarized to be propitious to ameliorate interfacial stability.Meanwhile,ex situ/in situ formed protective layers are highlighted in favor of heightening air stability.Finally,several possible directions for the future research on advanced Li metal anode are addressed. 展开更多
关键词 air stability artificial layer interfacial stability Li metal protection lithium metal anode
Dendrite‐free lithium and sodium metal anodes with deep plating/stripping properties for lithium and sodium batteries 认领
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作者 Jianyi Wang Qi Kang +7 位作者 Jingchao Yuan Qianru Fu Chunhua Chen Zibo Zhai Yang Liu Wei Yan Aijun Li Jiujun Zhang 《碳能源》 CAS 2021年第1期153-166,共14页
Although lithium(Li)and sodium(Na)metals can be selected as the promising anode materials for next‐generation rechargeable batteries of high energy density,their practical applications are greatly restricted by the u... Although lithium(Li)and sodium(Na)metals can be selected as the promising anode materials for next‐generation rechargeable batteries of high energy density,their practical applications are greatly restricted by the uncontrollable dendrite growth.Herein,a platinum(Pt)–copper(Cu)alloycoated Cu foam(Pt–Cu foam)is prepared and then used as the substrate for Li and Na metal anodes.Owing to the ultrarough morphology with a threedimensional porous structure and the quite large surface area as well as lithiophilicity and sodiophilicity,both Li and Na dendrite growths are significantly suppressed on the substrate.Moreover,during Li plating,the lithiated Pt atoms can dissolve into Li phase,leaving a lot of microsized holes on the substrate.During Na plating,although the sodiated Pt atoms cannot dissolve into Na phase,the sodiation of Pt atoms elevates many microsized blocks above the current collector.Either the holes or the voids on the surface of Pt–Cu foam what can be extra place for deposited alkali metal,what effectively relaxes the internal stress caused by the volume exchange during Li and Na plating/stripping.Therefore,the symmetric batteries of Li@Pt–Cu foam and Na@Pt–Cu foam have both achieved long‐term cycling stability even at ultrahigh areal capacity at 20 mAh cm−2. 展开更多
关键词 dendrite‐free Li and Na metal anodes Li and Na metal batteries Pt–Cu alloy‐coated Cu foam ultrahigh areal capacity
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水解制氢材料研究进展 认领
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作者 邓霁峰 陈顺鹏 +2 位作者 武晓娟 郑捷 李星国 《无机材料学报》 SCIE EI CAS 北大核心 2021年第1期1-8,共8页
水解制氢是一种常温常压下的现场制氢方式。由于水解制氢材料氢含量高,储存容易,运输方便,安全可靠,一直受到研究者们的关注。本文综述了近年来水解制氢材料的总体发展情况,介绍了三类主要的水解制氢材料,包括硼氢化物(NaBH4,NH3·B... 水解制氢是一种常温常压下的现场制氢方式。由于水解制氢材料氢含量高,储存容易,运输方便,安全可靠,一直受到研究者们的关注。本文综述了近年来水解制氢材料的总体发展情况,介绍了三类主要的水解制氢材料,包括硼氢化物(NaBH4,NH3·BH3)、金属(Mg,Al)以及金属氢化物(MgH2),对不同材料的制氢原理、主要问题、催化剂与材料设计进行了详细介绍,比较了不同体系的特点与制氢成本,并对水解制氢及水解制氢材料的现状和商业化面临的困难做了评价,最后对未来的发展方向进行了展望。 展开更多
关键词 制氢 水解 金属 金属氢化物 硼氢化物 制氢成本
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Background Concentration of Copper and Cadmium in Water from a High Industrialized and Urban Coastal System (Baixada Santista, Brazil)—Contribution to a Monitoring Program 认领
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作者 Elisabete S. Braga Riso D. Ricardo 《地球科学和环境保护期刊(英文)》 2021年第1期132-150,共19页
The Baixada Santista coastal region is well known in the context of the high atmospheric, soil and aquatic pollution levels derived from port, industrial, domestic and urban activities existent there, mainly in functi... The Baixada Santista coastal region is well known in the context of the high atmospheric, soil and aquatic pollution levels derived from port, industrial, domestic and urban activities existent there, mainly in function of the Cubat<span style="white-space:nowrap;">&atilde;</span>o industrial pole and port of Santos. The contamination by trace metals in this region is rarely measured in water column when compared with metal determinations in sediment studies. This study aims to evidence the levels of dissolved copper and total cadmium concentrations in estuarine and seawater waters using electrochemical analysis as a chronopotentiometric stripping polarography, which could improve the environmental monitoring program. The study was performed in the Bay of Santos reaching two estuarine channels (Santos and S<span style="white-space:nowrap;">&atilde;</span>o Vicente Channels) in two tide periods in summer 2001. This region is influenced by terrestrial and anthropogenic inputs of trace metals to seawater. The results showed that dissolved copper and total cadmium in water presented the maxima concentrations of 45.4 nM and 2.6 nM respectively. They not reached the limits proposed by Brazilian Environmental Law (CONAMA), that indicate, as reference, a maximum of 123 nM and 350 nM for dissolved copper and total cadmium, respectively and, considering seawater coastal system (salinity > 30, class 2) and also brackish water (class 2). Although the values were under the maximum recommended for each metal, the concentrations were not negligible in relation to the other polluted areas in the world. The values distribution along the system showed a progressive increase in direction to the inner part of the system that naturally compromises the local biota whose is more exposed to the bioaccumulation processes, and this data corresponds to an important reference preterit value to the monitoring program. The trace metal bioaccumulation by mangrove vegetation and by the biota in the internal part of the estuarine channels increa 展开更多
关键词 Dissolved Toxic Metals Tide Variation Chronopotentiometric Analytical Method Metal Biogeochemical Cycles Bay of Santos
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Designer uniform Li plating/stripping through lithium–cobalt alloying hierarchical scaffolds for scalable high-performance lithium-metal anodes 认领
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作者 Xinhua Liu Xiaojuan Qian +13 位作者 Weiqiang Tang Hui Luo Yan Zhao Rui Tan Mo Qiao Xinlei Gao Yang Hua Huizhi Wang Shuangliang Zhao Chao Lai Magda Titirici Nigel PBrandon Shichun Yang Billy Wub 《能源化学:英文版》 SCIE EI CAS 2021年第1期385-392,I0013,共9页
Lithium metal anodes are of great interest for advanced high-energy density batteries such as lithiumair, lithium-sulfur and solid-state batteries, due to their low electrode potential and ultra-high theoretical capac... Lithium metal anodes are of great interest for advanced high-energy density batteries such as lithiumair, lithium-sulfur and solid-state batteries, due to their low electrode potential and ultra-high theoretical capacity. There are, however, several challenges limiting their practical applications, which include low coulombic efficiency, the uncontrollable growth of dendrites and poor rate capability. Here, a rational design of 3D structured lithium metal anodes comprising of in-situ growth of cobalt-decorated nitrogen-doped carbon nanotubes on continuous carbon nanofibers is demonstrated via electrospinning.The porous and free-standing scaffold can enhance the tolerance to stresses resulting from the intrinsic volume change during Li plating/stripping, delivering a significant boost in both charge/discharge rates and stable cycling performance. A binary Co-Li alloying phase was generated at the initial discharge process, creating more active sites for the Li nucleation and uniform deposition. Characterization and density functional theory calculations show that the conductive and uniformly distributed cobalt-decorated carbon nanotubes with hierarchical structure can effectively reduce the local current density and more easily absorb Li atoms, leading to more uniform Li nucleation during plating. The current work presents an advance on scalable and cost-effective strategies for novel electrode materials with 3D hierarchical microstructures and mechanical flexibility for lithium metal anodes. 展开更多
关键词 Li metal anode Mixed conductor interface 3D porous host Dendrite free Metal-carbon nanofibers
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On Application of Metal Additive Manufacturing 认领
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作者 Chunhua Sun Guangqing Shang 《世界工程和技术(英文)》 2021年第1期194-202,共9页
Metal additive manufacturing is an important branch of AM, which provides an effective method for the innovative manufacturing of metal parts. Here, flow chart and main techniques of metal additive manufacturing are f... Metal additive manufacturing is an important branch of AM, which provides an effective method for the innovative manufacturing of metal parts. Here, flow chart and main techniques of metal additive manufacturing are firstly described according to the used material types. Many application examples of metal additive manufacturing are then listed based on application value. The summary is finally given to point development direction of metal additive manufacturing in the future. Additive manufacturing, which is an effective supplement to traditional methods, will play an important role in intelligent and digital manufacturing. 展开更多
关键词 Additive Manufacturing 3D Printing Metal Material Rapid Prototyping
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Metal Complexes with 8-Hydroxyquinoline: Synthesis and <i>In Vitro</i>Antimicrobial Activity 认领
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作者 Amira Cipurković Emir Horozić +3 位作者 Snjež ana Marić Lejla Mekić Halid Junuzović 《应用科学(英文)》 2021年第1期1-10,共10页
In this paper, three complexes with 8-hydroxyquinoline (8-HQ) were synthesized, their spectral analysis was performed and the antimicrobial effect was examined <em>in vitro</em>. The stoichiometric ratio o... In this paper, three complexes with 8-hydroxyquinoline (8-HQ) were synthesized, their spectral analysis was performed and the antimicrobial effect was examined <em>in vitro</em>. The stoichiometric ratio of the complex was determined conductometrically and spectrophotometrically. FTIR and UV/VIS spectroscopy were used for structural characterization. Antimicrobial activity was examined by diffusion technique on selected gram-positive and gram-negative bacteria, and<em> C. albicans</em>. Square planar and octahedral geometry complexes were synthesized by mixing in a molar ratio of 1:2 (M:L). Based on the spectral data, it is concluded that both oxygen and nitrogen atoms from 8-HQ are involved in the formation of the complex. The antimicrobial activity of the complexes is high, with zones of inhibition in the range of 15 - 28 mm. 8-HQ was shown to have a significantly higher ability to inhibit the growth of the tested microorganisms. 展开更多
关键词 8-HQ Metal Complex Antimicrobial Activity In Vitro Study
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A 3D conducting scaffold with in-situ grown lithiophilic Ni_(2)P nanoarrays for high stability lithium metal anodes 认领
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作者 Huai Jiang Hailin Fan +6 位作者 Zexun Han Bo Hong Feixiang Wu Kai Zhang Zhian Zhang Jing Fang Yanqing Lai 《能源化学:英文版》 SCIE EI CAS 2021年第3期301-309,共9页
Lithium(Li)metal is the most potential anode material for the next-generation high-energy rechargeable batteries.However,intrinsic surface unevenness and‘hostless’nature of Li metal induces infinite volume effect an... Lithium(Li)metal is the most potential anode material for the next-generation high-energy rechargeable batteries.However,intrinsic surface unevenness and‘hostless’nature of Li metal induces infinite volume effect and uncontrollable dendrite growth.Herein,we design the in-situ grown lithiophilic Ni_(2)P nanoarrays inside nickel foam(PNF).Uniform Ni_(2)P nanoarrays coating presents a very low nucleation overpotential,which induces the homogeneous Li deposition in the entire spaces of three-dimensional(3D)metal framework.Specifically,the lithiophilic Ni_(2)P nanoarrays possess characteristics of electrical conductivity and structural stability,which have almost no expansion and damage during repeating Li plating/stripping.Therefore,they chronically inhibit the growth of Li dendrites.This results in an outstanding Coulombic efficiency(CE)of 98% at 3 mA cm^(-2) and an ultra long cycling life over 2000 cycles with a low overpotential.Consequently,the PNF-Li||LiFePO_(4) battery maintains a capacity retention of 95.3% with a stable CE of 99.9% over 500 cycles at 2 C. 展开更多
关键词 Li metal anodes Ni_(2)P nanoarrays 3D metal framework Uniform Li deposition Superior lithiophilicity
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Optimization of Wear Factors of Aluminium Hybrid Metal Matrix Composites Using Taguchi Method 认领
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作者 P. B. Asha Sneha Sarika Murthy +3 位作者 C. R. Prakash Rao V. Ravi Kumar R. Kiran C. N. Suresha 《矿物质和材料特性和工程(英文)》 2021年第1期38-47,共10页
Hybrid metal matrix composites (Hmmc) are found to be more superior than the conventional composite materials because of their improved mechanical properties, which can be suited for an extensive range of engineering ... Hybrid metal matrix composites (Hmmc) are found to be more superior than the conventional composite materials because of their improved mechanical properties, which can be suited for an extensive range of engineering applications. Automobile and aerospace industries widely make use of hybrid composites as they possess excellent corrosion, wear resistance, low density, and high strength. This paper displays the strategy to build the hybrid composite utilizing Stir casting Method. Present investigation includes the creation of composites utilizing boron carbide (2%, 4%, 6% volume) and Red mud (2% volume) as the reinforcements and Structural aluminium as the matrix. Experimental investigation of wear analysis of the composites was carried out according to the L9 Taguchi method. The designated number of experiments was accomplished to probe the impact of control factors on the specific wear rate (SWR) of the developed composites. ANOVA was carried out and Wt%. Reinforcement was found to be the decisive factor on the SWR of the developed hybrid composite. The Confirmatory test was successfully carried out and the computed error was found to be varying from 0.878% to 2.58%. 展开更多
关键词 Taguchi ANNOVA WEAR Signal-to-Noise Ratio Hybrid Metal Matrix Composite
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Preparation of Polymer-Mineral Nanocomposites Based on Vinyl Monomers and Dispersed Inorganic Oxides 认领
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作者 Volodymyr Dutka Yaroslav Kovalskyi +1 位作者 Olena Aksimentyeva Nataliya Oshchapovska 《化学工程与科学期刊(英文)》 2021年第1期18-28,共11页
The polymer-mineral composites were synthesized using vinyl monomers styrene<span "="" style="font-size:10.5pt;"><span style="font-size:12px;">, methyl acrylate, and buty... The polymer-mineral composites were synthesized using vinyl monomers styrene<span "="" style="font-size:10.5pt;"><span style="font-size:12px;">, methyl acrylate, and butyl acrylate with nano dispersed oxides Fe</span><sub><span style="font-size:12px;">2</span></sub><span style="font-size:12px;">O</span><sub><span style="font-size:12px;">3</span></sub><span style="font-size:12px;">, Cr</span><sub><span style="font-size:12px;">2</span></sub><span style="font-size:12px;">O</span><sub><span style="font-size:12px;">3</span></sub><span style="font-size:12px;">, V</span><sub><span style="font-size:12px;">2</span></sub><span style="font-size:12px;">O</span><sub><span style="font-size:12px;">5</span></sub><span style="font-size:12px;"> and SiO</span><sub><span style="font-size:12px;">2</span></sub><span style="font-size:12px;"> in the presence of benzoyl peroxide and other peroxide initiators. Benzoyl peroxide adsorption on Fe</span><sub><span style="font-size:12px;">2</span></sub><span style="font-size:12px;">O</span><sub><span style="font-size:12px;">3</span></sub><span style="font-size:12px;">, Cr</span><sub><span style="font-size:12px;">2</span></sub><span style="font-size:12px;">O</span><sub><span style="font-size:12px;">3</span></sub><span style="font-size:12px;">, and V</span><sub><span style="font-size:12px;">2</span></sub><span style="font-size:12px;">O</span><sub><span style="font-size:12px;">5</span></sub><span style="font-size:12px;"> surfaces was studied. The adsorption parameters were found: adsorption-desorption equilibrium constants, maximum adsorption, and the area occupied by the molecule benzoyl peroxide on the surface of the adsorbent. The molecular weights of the polymers in the composites and the degree of grafting of the macromolecules of the polymer to the surface of oxides were studied. It has been found that the surface of the dispersed oxides influences the rate of thermal decomposition of the peroxide initiators and the polymerization parameters of the vinyl monomers.</span></span> 展开更多
关键词 Polymer-Mineral Composites Organic Peroxides Radical Polymerization Peroxide Thermal Degradation Metal Oxides ADSORPTION Effect of Surface
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文章速递Nonlinear photoncurrent in transition metal dichalcogenide with warping term under illuminating of light 认领
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作者 朱国宝 杨慧敏 张运海 《中国物理B:英文版》 SCIE EI CAS CSCD 2021年第3期436-440,共5页
We investigate the photoconductivities of injection current and the shift current in transition metal dichalcogenide with warping term in the presence of sublattice potential and spin orbit coupling.The system shows t... We investigate the photoconductivities of injection current and the shift current in transition metal dichalcogenide with warping term in the presence of sublattice potential and spin orbit coupling.The system shows the valley photoconductivities of injection current and the photoconductivities of shift current.It is found that the warping term and the geometric tensor play a critical role in the system,which are responsible for the photoconductivities.Due to the interplay between the sublattice potential and the spin orbit coupling,the photoconductivities can be tuned.Furthermore,the effect of warping term on geometric tensor and the amplitude of the photoconductivities are also discussed. 展开更多
关键词 photoconductivity transition metal dichalcogenide warping term
文章速递A MOVPE method for improving InGaN growth quality by pre-introducing TMIn 认领
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作者 曹子坤 赵德刚 +3 位作者 杨静 朱建军 梁锋 刘宗顺 《中国物理B:英文版》 SCIE EI CAS CSCD 2021年第1期551-554,共4页
We propose a metal organic vapor phase epitaxy(MOVPE) method of pre-introducing TMIn during the growth of uGa N to improve the subsequent growth of In Ga N and discuss the impact of this method in detail. Monitoring t... We propose a metal organic vapor phase epitaxy(MOVPE) method of pre-introducing TMIn during the growth of uGa N to improve the subsequent growth of In Ga N and discuss the impact of this method in detail. Monitoring the MOVPE by the interference curve generated by the laser incident on the film surface, we found that this method avoided the problem of the excessive In Ga N growth rate. Further x-ray diffraction(XRD), photoluminescence(PL), and atomic force microscope(AFM) tests showed that the quality of In Ga N is improved. It is inferred that by introducing TMIn in advance, the indium atom can replace the gallium atom in the reactor walls, delivery pipes, and other corners. Hence the auto-incorporation of gallium can be reduced when In Ga N is grown, so as to improve the material quality. 展开更多
关键词 InGaN metal organic vapor phase epitaxy(MOVPE)
文章速递Asymmetric double-layer composite electrolyte with enhanced ionic conductivity and interface stability for all-solid-state lithium metal batteries 认领
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作者 Binglu Zhao Luxiang Ma +5 位作者 Kai Wu Mengxiong Cao Minggui Xu Xinxiang Zhang Wen Liu Jitao Chen 《中国化学快报:英文版》 SCIE CAS CSCD 2021年第1期125-131,共7页
All-solid-state Li metal battery has been regarded as a promising battery technology due to its high energy density based on the high capacity of lithium metal anode and high safety based on the all solid state electr... All-solid-state Li metal battery has been regarded as a promising battery technology due to its high energy density based on the high capacity of lithium metal anode and high safety based on the all solid state electrolyte without inflammable solvent.However,challenges still exist mainly in the poor contact and unstable interface between electrolyte and electrodes.Herein,we demonstrate an asymmetric design of the composite polymer electrolyte with two different layers to overcome the interface issues at both the cathode and the anode side simultaneously.At the cathode side,the polypropylene carbonate layer has enough viscosity and flexibility to reduce the inter-facial resistance,while at the Li anode side,the polyethylene oxide layer modified with hexagonal boron nitride has high mechanical strength to suppress the Li dendrite growth.Owing to the synergetic effect between different components,the asprepared double layer composite polymer electrolyte demonstrates a large electrochemical window of5.17 V,a high ionic conductivity of 6.1×10~(-4) S/cm,and a transfe rence number of 0.56,featuring excellent ion transport kinetics and good chemical stability.All-solid-state Li metal battery assembled with LiFePO_4 cathode and Li anode delivers a high capacity of 150.9 mAh/g at 25℃ and 0.1 C-rate,showing great potential for practical applications. 展开更多
关键词 All-solid-state battery Polymer electrolyte Lithium metal anode Interfacial engineering Lewis acid
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