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International Conference on Mechatronics and Semiconductor Materials (ICMSCM 2013)

作者： Li, Yanming Wang, Lifeng Univ Sci & Technol Liaoning Sch Appl Technol Anshan Peoples R China Bohai Univ Teaching & Res Inst Foreign Language Jinzhou Peoples R China

ISBN: (纸本)9783037859391

Traditional teaching management mode can't meet the needs of the teaching management information age, to develop the management system of college English learning, is the extension and expansion of conventional English teaching in English teaching and the inevitable requirement to improve the quality of English teaching. Aiming at the existing problem of system development, this paper makes research on the frame structure. First of all, the research consists of eight functions to complete the whole learning process management function framework;then, study on the technology framework is composed of model, view and controller, design concept is decoupling performance logic and business logic through controller;Finally, the work principle of the struts2 framework, and the working process is described. In this paper, the research content, improve the labor productivity of software development, changed the traditional mode of software development, plays an important role in improving college students' English level.

关键词： Struts2 college English learning management system framework structure functional framework technical framework principles framework

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Constructing mixed-dimensional lightweight flexible carbon foam/carbon nanotubes-based heterostructures: An effective strategy to achieve tunable and boosted microwave absorption

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CARBON 2023年 206卷 364-374页

作者： Jia, Tianming Qi, Xiaosi Wang, Lei Yang, Jing-Liang Gong, Xiu Chen, Yanli Qu, Yunpeng Peng, Qiong Zhong, Wei Guizhou Univ Coll Phys Guizhou Prov Key Lab Photoelect Technol & Applica Guiyang 550025 Peoples R China Nanjing Univ Natl Lab Solid State Microstruct Jiangsu Prov Lab NanoTechnol Nanjing 210093 Peoples R China Jiangsu Univ Sci & Technol Natl Demonstrat Ctr Expt Mat Sci & Engn Educ Zhenjiang 212003 Peoples R China

Taking full advantage of interface engineering to strengthen interface polarization is an effective strategy to improve microwave absorption. Therefore, constructing the mixed-dimensional heterostructures and/or threedimensional (3D) interconnected network structures should be attractive pathways to create the abundant interfaces for enhanced interfacial effect. Herein, mixed-dimensional framework structure carbon foam (CF)/ carbon nanotubes (CNTs)@Fe3C@Fe3O4 samples consisting of 3D CF, one-dimensional (1D) CNTs and zerodimensional (0D) Fe3C@Fe3O4 nanoparticles were elaborately designed and produced through a simple catalytic chemical vapor deposition process. The as-prepared CF/CNTs@Fe3C@Fe3O4 heterostructures with the different contents of CNTs could be selectively produced by regulating the pyrolysis time. Owing to the unique structure and excellent synergistic effects, the obtained mixed-dimensional CF/CNTs@Fe3C@Fe3O4 samples presented the excellent comprehensive electromagnetic wave absorption performances (EMWAPs) including strong absorption capabilities, broad absorption bandwidths, thin matching thicknesses and low densities. Furthermore, the obtained results demonstrated that the enhanced content of CNTs greatly boosted their conduction and polarization loss abilities, which resulted in the enhanced comprehensive EMWAPs. Therefore, our findings not only offered a simple strategy to produce the mixed-dimensional framework structure magnetic CF/ CNTs-based heterostructures as excellent lightweight high-efficiency microwave absorbers, but also provided an effective pathway to make the best of interface engineering for enhancing interface polarization.

关键词： Interface engineering Mixed -dimensional heterostructures Lightweight framework structure Microwave absorption

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Catalytic properties of the framework-structured zirconium-containing phosphates in ethanol conversion

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RESEARCH ON CHEMICAL INTERMEDIATES 2021年第9期47卷 3645-3659页

作者： Mayorov, Pavel Asabina, Elena Zhukova, Anna Osaulenko, Diana Pet'kov, Vladimir Lavrenov, Dmitry Kovalskii, Andrey Fionov, Alexander Lobachevsky Univ Dept Chem Nizhnii Novgorod 603950 Russia RUDN Univ Peoples Friendship Univ Russia Phys & Colloidal Chem Dept 6 Miklukho Maklaya St Moscow 117198 Russia NUST MISIS Moscow 119991 Russia Lomonosov Moscow State Univ Moscow 119991 Russia

Aliphatic alcohols C1-C4 can serve as raw material for the production of essential organic products, such as olefins, aldehydes, ketones and ethers. For the development of catalysts of alcohols' conversion, the authors considered two families of framework phosphate compounds with significant chemical, thermal and phase stability: NaZr2(PO4)(3) (NZP/NASICON) and Sc-2(WO4)(3) (SW). Variation in the composition of zirconium-containing NZP- and SW-complex phosphates allows one to vary the number and strength of Lewis acid centers and incorporate oxidative-reducing centers (such as d-transition metals) into the structure. The phosphates M0.5+xNixZr2 - x(PO4)(3) (where M are Mn and Ca) were studied in the reactions of ethanol conversion. From the results of complex investigation, the compounds with M-Mn (x = 0, 0.3 and 0.5) were crystallized in the SW-type (monoclinic symmetry), while the phosphates with M-Ca (x = 0, 0.2 and 0.4) were characterized as the NZP-structured compounds (trigonal symmetry). The surface areas and pore volumes of synthesized catalysts varied, with different compositions, from 14 to 32 m(2)/g and 0.03 to 0.12 mL/g, respectively. From the catalytic experiments, the main direction of conversion on all the studied catalysts was ethanol dehydrogenization with acetaldehyde formation. The other conversion products-diethyl ether and ethylene-were produced with small yields. Based on the results obtained, the NZP-sample Ca0.5Zr2(PO4)(3) can be considered as a selective catalyst for producing acetaldehyde at 400 degrees C with a yield of 55% from its theoretical amount.

关键词： Phosphate framework structure Heterogeneous catalysis Ethanol conversion

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Enhanced cadmium removal by a magnetic potassium ferrocyanide framework: Performance and mechanism study

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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024年 282卷 116702页

作者： Chen, Miaoling Liu, Heyao Pan, Jiaqi He, Shaoming Hong, Yang Wang, Shuwen Zhou, Ying Chen, Diyun Su, Minhua Guangzhou Univ Sch Environm Sci & Engn Guangzhou 510006 Peoples R China Beijing Normal Univ Adv Inst Nat Sci Ctr Water Res Zhuhai 519087 Peoples R China

Polluted environments often contain large amounts of toxic metals, such as cadmium, which pose a major threat to ecosystems and public health. Contamination by cadmium and its compounds is often observed in areas surrounding zinc mining sites and electroplating factories, and the control of cadmium pollution is essential for environmental safety and health. In this study, a highly efficient and straightforward separation strategy for K 4 Fe (CN) 6 @Fe 3 O 4 nanocomposites is successfully developed to capture the Cd ions in the water environment. Batch adsorption experiments revealed that K 4 Fe(CN) 6 @Fe 3 O 4 exhibited a high cadmium removal rate (greater than 98 %) at a pH level of 6.0 and solid-liquid ratio of 1.0 g/L at room temperature (298 K). Kinetic analysis revealed that the adsorption process followed a pseudo-second-order model and cadmium was rapidly removed in the first 10 min, with chemisorption dominating the capture of Cd 2+ by K 4 Fe(CN) 6 @Fe 3 O 4 . Adsorption isotherms revealed a heterogeneous adsorption behavior, with a maximum adsorption capacity of 40.78 mg/g. The intrinsic adsorption of Cd 2+ by K 4 Fe(CN) 6 @Fe 3 O 4 occurring primarily through electrostatic interaction and ion exchange. In addition, K 4 Fe(CN) 6 @Fe 3 O 4 exhibited an excellent regeneration capacity. Therefore, integrating Fe 3 O 4 into the metal cyanide not only provided the composite material with excellent chemical stability and selective adsorption sites for Cd 2+ , but also facilitated subsequent sorbent collection and recovery. Overall, this study presents a simple and feasible approach for integrating Fe 3 O 4 into potassium ferrocyanide frameworks for efficient cadmium removal from contaminated water.

关键词： Adsorption Cadmium framework structure Magnetic potassium ferrocyanide

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Porphyrin- and phthalocyanine-based systems for rechargeable batteries

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ENERGY STORAGE MATERIALS 2022年 52卷 495-513页

作者： Wang, Heng-guo Wu, Qiong Cheng, Linqi Chen, Lan Li, Mengfan Zhu, Guangshan Northeast Normal Univ Key Lab Polyoxometalate & Reticular Mat Chem Minist Educ 5268 Renmin St Changchun 130024 Peoples R China Northeast Normal Univ Fac Chem 5268 Renmin St Changchun 130024 Peoples R China Jilin Normal Univ Key Lab Funct Mat Phys & Chem Minist Educ 399 Zhuoyue St Changchun 130103 Peoples R China

Porphyrin and phthalocyanine, typically planar aromatic macrocyclic molecules, have attracted considerable attention for application in rechargeable batteries due to their highly conjugated pi-electron system, highly stable C-N bonds and bipolar features. In particular, the structure diversity from the central metal and the peripheral substitution groups not only endows them multiple functions in various rechargeable batteries, but also makes them as structural units to construct various framework structures. Herein, a timely and systematic review about porphyrin-and phthalocyanine-based systems for rechargeable batteries is thoroughly summarized for the first time. Especially, their multiple functions and reaction mechanisms as redox active sites, redox mediators, O-2/CO2 shuttles or electrocatalysts for metal ion batteries, dual-ion batteries, Li-S batteries, Li-O-2 batteries or Li-CO2 batteries are also summarized and discussed. In addition, the merging porphyrin-and phthalocyanine-based frameworks are timely highlighted. Finally, current challenges and future perspectives are proposed. We hope this review would provide some inspirations on the development of porphyrin-and phthalocyanine-based systems for advanced rechargeable batteries.

关键词： Porphyrin Phthalocyanine framework structure Rechargeable batteries Reaction mechanism

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Reaction Synthesis for Producing MoSi2-Based Coatings

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RUSSIAN METALLURGY 2022年第12期2022卷 1569-1577页

作者： Astapov, A. N. Matulyak, A. I. Moscow Inst Aviat Technol Moscow 125993 Russia

MoSi2-based coatings on a CSC substrate are formed by reaction synthesis using slurry painting of powder compositions at 1500 degrees C and a pressure of 8-9 mPa. Mechanisms are proposed for the reaction interaction in the Mo-Si-C and Mo-Si-C-HfB2 systems, which determine the synthesis of the secondary phases MoSi2, Mo4.8Si3C0.6, MoB, and HfC. Possible chemical reactions are thermodynamically calculated. Possible causes of the high porosity of the synthesized coatings are analyzed.

关键词： carbon-carbon composites (CCC) carbon-ceramic composites (CSC) protective coating reaction synthesis sintering framework structure porosity molybdenum disilicide Nowotny phase molybdenum monoboride hafnium diboride hafnium carbide

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Fully-Printed Flexible Aqueous Rechargeable Sodium-Ion Batteries

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SMALL 2024年第28期20卷 2312207-2312207页

作者： Ren, Hehe Zhang, Xinyu Liu, Qun Tang, Weinan Liang, Jing Wu, Wei Wuhan Univ Sch Phys & Technol Lab Printable Funct Mat & Printed Elect Wuhan 430072 Peoples R China

The flexible aqueous rechargeable sodium-ion batteries (ARSIBs) are a promising portable energy storage system that can meet the flexibility and safety requirements of wearable electronic devices. However, it faces huge challenges in mechanical stability and facile manufacturing processes. Herein, the first fully-printed flexible ARSIBs with appealing mechanical performance by screen-printing technique is prepared, which utilizes Na3V2(PO4)2F3/C (NVPF/C) as the cathode and 2% nitrogenous carbon-loaded Na3MnTi(PO4)3/C (NMTP/C/NC) as the anode. In particular, the organic co-solvent ethylene glycol (EG) is cleverly added to 17 m (mol kg-1) NaClO4 electrolyte to prepare a 17 m NaClO4-EG mixed electrolyte. This mixed electrolyte can withstand low temperatures of -20 degrees C in practical applications. Encouragingly, the fully-printed flexible ARSIBs (NMTP/C/NC//NVPF/C) exhibit a discharge capacity of 40.1 mAh g-1, an energy density of 40.1 Wh kg-1, and outstanding cycle performance. Moreover, these batteries with various shapes can be used as an energy wristband for an electronic watch in the bending states. The fully-printed flexible ARSIBs in this work are expected to shed light on the development of energy for wearable electronics. The first fully-printed flexible ARSIBs are fabricated by screen-printing technique, which exhibit excellent capacity and outstanding cycle performance. In particular, the batteries with various shapes present appealing mechanical performance in the bending states, which can be used as an energy wristband for an electronic watch. image

关键词： aqueous rechargeable sodium-ion batteries flexible electronics framework structure screen-printing technique

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Mixed-metal phosphates K1.64Na0.36TiFe(PO4)3 and K0.97Na1.03Ti1.26F0.74(PO4)3 with a langbeinite framework

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ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS 2021年第12期77卷 1299-+页

作者： Zatovsky, Igor, V Strutynska, Nataliia Yu Ogorodnyk, Ivan, V Baumer, Vyacheslav N. Slobodyanik, Nickolai S. Butenko, Denis S. NAS Ukraine FD Ovcharenko Inst Biocolloidal Chem 42 Acad Vernadskoho Blv UA-03142 Kiev Ukraine Taras Shevchenko Natl Univ Kyiv Dept Inorgan Chem 64-13 Volodymyrska Str UA-01601 Kiev Ukraine ShimUkraine LLC 18 Chigorina StrOff 429 UA-01042 Kiev Ukraine NAS Ukraine STC Inst Single Crystals 60 Lenin Ave UA-61001 Kharkiv Ukraine Southern Univ Sci & Technol Acad Adv Interdisciplinary Studies Shenzhen Key Lab Solid State Batteries Shenzhen 518055 Peoples R China Southern Univ Sci & Technol Guangdong Prov Key Lab Energy Mat Elect Power Shenzhen 518055 Peoples R China

Single crystals of the langbeinite-type phosphates K1.65Na0.35TiFe(PO4)(3) and K0.97Na1.03Ti1.26Fe0.74(PO4)(3) grown by crystallization from high-temperature were self-fluxes in the system Na2O-K2O-P2O5-TiO2-Fe2O3 using fixed molar ratios of (Na+K):P = 1.0, Ti:P = 0.20 and Na:K = 1.0 or 2.0 over the temperature range 1273-953 K. The three-dimensional framework of the two isotypic phosphates are built up from [(Ti/Fe)(2)(PO4)(3)] structure units containing two mixed [(Ti/Fe)O-6] octahedra (site symmetry 3) connected via three bridging PO4 tetrahedra. The potassium and sodium cations share two different sites in the structure that are located in the cavities of the framework. One of these sites has nine and the other twelve surrounding O atoms.

关键词： crystal structure phosphate mixed occupancy framework structure

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Synthesis, structural characteristics, and thermal expansion behavior of zirconium phosphate ceramics with d-transition metals

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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 2021年第2期99卷 354-365页

作者： Glukhova, Irina Asabina, Elena Pet'kov, Vladimir Kovalsky, Andrey Pokholok, Konstantin Lobachevsky Univ Dept Chem Nizhnii Novgorod 603950 Russia Natl Univ Sci & Technol MISiS Moscow 119049 Russia Lomonosov Moscow State Univ Dept Chem Moscow 119991 Russia

The series M0.5(1+x)FexZr2-x(PO4)(3) (M-Ni, Cu, Mn) with Sc-2(WO4)(3)-related structure (SW) were prepared using Pechini technique and characterized by powder X-ray diffraction analysis, SEM, EDX, IR, and Mossbauer spectroscopy. The concentration and temperature limits of solid solution formation were determined, lattice parameters were calculated, and their dependencies on the phosphate's composition were studied. The crystal structure of the phosphate Mn0.65Fe0.3Zr1.7(PO4)(3) (x = 0.3) was refined by the Rietveld method basing on the powder X-ray diffraction data. The compound crystallizes in monoclinic symmetry (space group P2(1)/n) with lattice parameters: a = 8.7941(12), b = 8.9379(16), c = 12.4353(21) angstrom, beta = 90.126(24)degrees, V = 977.49(27) angstrom(3). Thermal expansion coefficients of the ceramics Cu0.5(1+x)FexZr2-x(PO4)(3) were determined. The volume expansion coefficients of the compounds vary in the range (4.4-10.8).10(-5) K-1.

关键词： Phosphate Ceramics Zirconium framework structure Thermal expansion

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The recent advance of precisely designed membranes for sieving

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NANOTECHNOLOGY 2023年第23期34卷 232003-232003页

作者： Xu, Miaomiao Zhu, Xianhu Zhu, Jihong Wei, Siyuan Cong, Xuelong Wang, Zhangyu Yan, Qiang Weng, Lixing Wang, Lianhui Nanjing Univ Posts & Telecommun State Key Lab Organ Elect & Informat Displays Nanjing Peoples R China Nanjing Univ Posts & Telecommun Inst Adv Mat IAM Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM Jiangsu Key Lab Biosensors Nanjing Peoples R China Nanjing Univ Posts & Telecommun Sch Geog & Biol Informat Nanjing Peoples R China Fudan Univ Dept Macromol Sci State Key Lab Mol Engn Polymers Shanghai Peoples R China

Developing new membranes with both high selectivity and permeability is critical in membrane science since conventional membranes are often limited by the trade-off between selectivity and permeability. In recent years, the emergence of advanced materials with accurate structures at atomic or molecular scale, such as metal organic framework, covalent organic framework, graphene, has accelerated the development of membranes, which benefits the precision of membrane structures. In this review, current state-of-the-art membranes are first reviewed and classified into three different types according to the structures of their building blocks, including laminar structured membranes, framework structured membranes and channel structured membranes, followed by the performance and applications for representative separations (liquid separation and gas separation) of these precisely designed membranes. Last, the challenges and opportunities of these advanced membranes are also discussed.

关键词： precisely designed membrane laminar structure framework structure channel structure

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