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Electrospinning preparation of NaA zeolite composite polyacrylonitrile membranes (NaA@PANMs) and studying on adsorption performance for Sr2+

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Environmental Research 2025年 279卷 121804页

作者： Liu, Yu Yi, Min Han, Tao Li, Xinlong Qin, Linqiao She, Yu Wei, Erna Wang, Kaituo School of Resources Environment and Materials State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials Guangxi University Guangxi Nanning530004 China Institute of Applied Radiation of Shanghai School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 China Guangxi Beitou Industrial Co. Ltd Guangxi Nanning530004 China

The NaA zeolite exhibits excellent adsorption performance for 90Sr in radioactive nuclear wastewater. However, the efficient and simple fabrication of NaA into membrane materials remains a critical challenge for its industrial application. In this study, NaA zeolite was uniformly blended with polyacrylonitrile (PAN) to prepare a novel hydrophilicity NaA zeolite composite PAN membrane (NaA@PANMs) via electrospinning technology. A comprehensive analytical characterization was conducted employing a range of techniques, including SEM-EDS, BET, XRD and FT-IR. The oxidation of NaA@PANMs at 200 °C resulted in enhanced mechanical strength and stability in warm water (75 °C), along with the acquisition of superior physicochemical properties. In addition, the batch experimental adsorption experiments showed that NaA@PANMs had a high adsorption capacity for Sr2+ ions, reaching 59.10 mg/g (removal rate of 98.50 %) at pH 6, with a maximum adsorption capacity of 85.21 mg/g at 298 K. The adsorption kinetics and thermodynamics were respectively consistent with pseudo-second-order and the Langmuir isotherm model. In the presence of coexisting ions, the Kd values of NaA@PANMs for Sr2+ were 3.8, 7.1, and 22.0 times higher than those for Ca2+, Mg2+, and K+, respectively. Additionally, 0.9 g NaA@PANMs demonstrated excellent dynamic adsorption performance for Sr2+ solutions at a flow rate of 0.25 mL/min. Moreover, the NaA@PANMs can still maintain surface integrity and excellent adsorption performance following irradiation at 300 kGy. The removal rate exceeding 70.00 % after three desorption cycles furtherly indicates potential application for the removal of Sr2+ in actual nuclear wastewater. © 2025 Elsevier Inc.

关键词： Composite membranes

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Flexible, highly transparent, and conductive ITO/Ag/ITO film with double symmetric structure for electrical heater and broadband electromagnetic interference shielding

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Chemical Engineering Journal 2025年 516卷

作者： Feng, Bofei Yang, Tao Zhu, Siyuan Yue, Yitong Zhou, Bing Yao, Zhiqiang Liu, Chuntai Han, Jian State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial Equipment National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou University Zhengzhou450002 China School of Materials Science and Engineering Zhengzhou University Zhengzhou450001 China

The increasingly serious problem of electromagnetic radiation pollution has put forward higher requirements for electromagnetic interference (EMI) shielding films to meet the special application such as optical windows, requiring high light transmittance while achieving excellent EMI shielding performance, but it is still a huge challenge. In this study, a symmetrical multilayer structure optimization strategy is employed to prepare transparent broadband EMI shielding films, while achieving high light transmittance and EMI shielding performance. The PC/ITO/Ag/ITO (IAI) film with single transparent conductive oxides (TCO) /metal layer/TCO (TMT) structure exhibits an efficient EMI shielding effectiveness (EMI SE) of 36.5 dB while achieving a light transmittance of 87.5 % at 550 nm. Additionally, superior interface adhesion (5B) enhances the bending resistance and environmental stability of IAI film, and excellent electrical conductivity gives it outstanding Joule heating performance. Furthermore, by designing a symmetrical TMT structure, the double-sided IAI (DIAI) film achieves an even better EMI SE of 67.5 dB within the wide band range (8.2–26.5 GHz), while maintaining an impressive light transmittance of 85.7 % (550 nm). The design of this symmetrical multilayer structure presents a promising approach for developing high-performance transparent EMI shielding films. © 2025 Elsevier B.V.

关键词： Electromagnetic pulse

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A method based on circumferential strain distribution for roller path design in conventional spinning of thin-walled conical part with curved surface

Research Square

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Research Square 2021年

作者： Wang, Yongdi Li, Hongwei Gao, Pengfei Zhan, Mei Yan, Xinggang Niu, Haotong State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment School of Materials Science and Engineering Northwestern Polytechnical University P.O. Box 542Shaanxi Xi'an710072 China

Multi-pass conventional spinning is the preferable forming technology for the forming of thin-walled conical part with curved surface (TCPCS) in aerospace field. In multi-pass conventional spinning, the design of roller path is a critical problem due to its sensitive effect on the deformation mode and forming defect during spinning process. However, at present, the roller path is still mainly designed based on experience and trial-and-error, which seriously restricts the high-performance spinning of TCPCS. In this work, a new quantitative method based on circumferential strain distribution was developed for the roller path design in multi-pass conventional spinning of TCPCS. In this method, the total required circumferential strain for the forming of final TCPCS by conventional spinning was firstly determined. Then, the spinning passes number were obtained through dividing the total required circumferential strain by the ultimate circumferential strain producing the spinning instability (Εθult). As for the roller path profile in each pass, it is divided into two sections and determined respectively, i.e. the attaching mandrel section and the performing section. The attaching mandrel section presents the same profile of mandrel. The profile of preforming section is determined point-by-point by distributing the rest of circumferential strain {Εθni} to produce the final TCPCS. The point-by-point distributed circumferential strain is half of the {Εθni} at the initial stage until reaches the half of Εθult, then it will keep the half of Εθult to the end. The proposed new method of roller path design was validated by finite element simulation, where well spinning stability, wall thickness distribution and roundness were obtained. This method provides a quantitative, high-efficient and universal way for the roller path design in conventional spinning of TCPCS. © 2021, CC BY.

关键词： Thin walled structures

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Aluminum introduced to the anion framework of cobalt silicate compositing with reduced graphene oxide showing improved electrochemical performances for hybrid supercapacitor

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Journal of Power Sources 2025年 648卷

作者： Liu, Yuxuan Zhang, Yifu Gao, Zhanming Tan, Xianfang Lv, Tianming Wang, Yang Chen, Dongzhi Cui, Miao Hu, Tao Meng, Changgong School of Chemistry Dalian University of Technology Dalian116024 China Hubei Key Laboratory of Radiation Chemistry and Functional Materials School of Nuclear Technology and Chemistry & Biology Hubei University of Science and Technology Xianning437100 China State Key Laboratory of New Textile Materials & Advanced Processing Technology Wuhan Textile University Wuhan430073 China College of Environmental and Chemical Engineering Dalian University Dalian116622 China

Transition metal silicates (TMSs) are frequently utilized as supercapacitor electrode materials because of their great thermal stability, plentiful reserves, and controlled structure. However, improving the conductivity of silicate materials is still the research goal. In order to create an effective carbon composite strategy, the sandwich structure of TMSs/carbon materials/TMSs is built in this article. Additionally, the Al element is included to enhance the electrochemical performance of silicate materials. This study describes the preparation of an aluminum-doped cobalt silicate/reduced graphene oxide/aluminum-doped cobalt silicate sandwich-like structure (Al-doped Co2SiO4/rGO/Al-doped Co2SiO4, denoted as rGO/ACS), applying a straightforward hydrothermal process with aluminum-doped silica/GO/aluminum-doped silica (Al-doped SiO2/GO/Al-doped SiO2, denoted as GO/Al-SiO2) as the template. At 1 A g−1, the specific capacity of rGO/ACS can reach 573 F g−1, which is 10 times that of CS (Co2SiO4, 57 F g−1) and 1.6 times that of rGO/CS (Co2SiO4/rGO/Co2SiO4, 362 F g−1). After 10,000 cycles, the capacitance retention of rGO/ACS is still 91 %, whose electrochemical performance is far superior to other silicon-based materials. In addition to having a surface capacitance of 763 mF cm−2 at 1 mA cm−2 with 81 % cycle performance after 8000 cycles, the rGO/ACS//AC hybrid supercapacitor performs exceptionally well electrochemically. This work demonstrates how the creation of Al-introduced TMSs/carbon materials/Al-introduced TMSs sandwich structure enhances the performance of silicate materials by combining the benefits of carbon composite and metal introduction, and it offers an option to further boost the conductivity of silicate. © 2025 Elsevier B.V.

关键词： Carbon carbon composites

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Structural phase transition of monochalcogenides investigated with machine learning

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Physical Review B 2022年第9期105卷 094116-094116页

作者： J. Zhang F. Zhang D. Wei L. Liu X. Liu D. Fang G. X. Zhang X. Chen D. Wang School of Microelectronics & State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China Key Lab of Micro-Nano Electronics and System Integration of Xi'an City Xi'an Jiaotong University Xi'an 710049 China Guangxi Key Laboratory of Optical and Electronic Materials and Devices College of Materials Science and Engineering Guilin University of Technology Guilin 541004 China Engineering Research Center of Nanoelectronic Integration and Advanced Equipment Ministry of Education School of Physics and Electronic Science East China Normal University Shanghai 200062 China MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of Physics Xi' an Jiaotong University Xi'an 710049 China School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 China Department of Applied Physics Aalto University Espoo 00076 Finland

As machine learning becomes increasingly important in science and engineering, it holds the promise to provide a universal approach applicable to various systems to investigate their crystalline phase transitions. Here, we build and train accurate artificial neural networks that can distinguish tiny energy difference, which is crucial to predict the crystalline phase transitions. Employing the trained artificial neural networks in Monte Carlo simulations as the surrogate energy function, we apply this approach to monochalcogenides, including bulk and two-dimensional monolayer SnTe and GeTe, investigating their crystalline phase transitions. The machine-learning approach, when viewed as providing a universal mathematical structure, can be transferred to the investigation of other materials when the training data set generated with ab initio methods are available. Moreover, the machine-learning approach resolves the difficulties associated with constructing the effective Hamiltonian for monochalcogenides, showing great potential with its accuracy and efficiency.

关键词： Ferroelectricity Structural phase transition Chalcogenides Machine learning

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Back Cover Image, Volume 6, Number 10, October 2024

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Carbon Energy 2024年第10期6卷

作者： Qihang Ding Zewen Jiang Kean Chen Hui Li Jingzhe Shi Xinping Ai Dingguo Xia Hubei Key Lab of Electrochemical Power Sources College of Chemistry & Molecular Science Wuhan University Wuhan China Beijing Key Laboratory of Theory and Technology for Advanced Batteries Materials College of Engineering Peking University Beijing China State Key Laboratory of New Textile Materials & Advanced Processing Technologies Wuhan Textile University Wuhan China Wuhan Britain-China School Wuhan China

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Determining the electrochemical activation mechanism of Prussian blue analog precatalysts for a high-efficiency oxygen evolution reaction

Energy Materials and Devices

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Energy materials and Devices 2023年第2期1卷 119-130页

作者： Wei Hua Huanhuan Sun Yueying Li Yu Zhang Jian-Gan Wang State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and Engi-neeringNorthwestern Polytechnical University and Shaanxi Joint Lab of Graphene(NPU)Xi’an 710072China New Energy(Photovoltaic)Industry Research Center Qinghai UniversityXining 810016China School of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China

Prussian blue analogs(PBAs)are effective precatalysts for the oxygen evolution reaction(OER);however,the underlying mechanism of their electrochemical activation is still not well *** this study,we designed and constructed PBA-based precatalysts to determine the electrochemical activation mechanism and achieve high-efficiency *** PBAs undergo in situ electrochemical transformation to form the corre-sponding metal(oxy)hydroxides(M(O)OH)as the true OER *** importantly,the hexacyanoferrate ligands undergo repetitive interfacial coordination/etching with/from M(O)OH during the activation *** distinct mechanism could achieve in situ Fe doping and enable defect *** defect-enriched Fe-NiOOH derived from a well-designed NiHCF/Ni(OH)2 precatalyst requires a low overpotential of 227 mV to reach a current density of 10 mA cm−2 and works stably at 130 mA cm−2 over 100 *** study provides fundamental insights into the electrochemical activation mechanism for developing advanced precatalysts for OER.

关键词： electrochemical activation Prussian blue analogs oxygen evolution reaction water splitting

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Porous bowl-shaped VS2 nanosheets/graphene composite for high-rate lithium-ion storage

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Journal of Energy Chemistry 2020年第4期29卷 24-32页

作者： Daxiong Wu Caiyun Wang Mingguang Wu Yunfeng Chao Pengbin He Jianmin Ma School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research InstituteUniversity of WollongongNew South Wales 2522Australia Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002HenanChina State Key Lab of Chemical Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Two-dimensional (2D) layered vanadium disulfide (VS2) is a promising anode material for lithium ion batteries (LIBs) due to the high theoretical ***,it remains a challenge to synthesize monodispersed ultrathin VS2 nanosheets to realize the full ***,a novel solvothermal method has been developed to prepare the monodispersed bowl-shaped NH3-inserted VS2 nanosheets (VS2).The formation of such a unique structure is caused by the blocked growth of (001) or (002) crystal planes in combination with a ripening process driven by the *** annealing treatment in Ar/H2creates porous monodispersed VS2(H-VS2),which is subsequently integrated with graphene oxide to form porous monodispersed H-VS2/rGO composite coupled with a reduction *** an anode material for LIBs,H-VS2/rGO delivers superior rate performance and longer cycle stability:a high average capacity of 868/525 mAh g^-1 at a current density of 1/10 A g^-1;a reversible capacity of 1177/889 mAh g^-1 after 150/500 cycles at 0.2/1 A g^-*** excellent electrochemical performance may be attributed to the increased active sites available for lithium storage,the alleviated volume variations and the shortened Li-ion diffusion induced from the porous structure with large specific surface area,as well as the protective effect from graphene nanosheets.

关键词： Vanadium disulfide Graphene Lithium-ion batteries Nanosheets Composite

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Al-Doped LiNi0.5Mn1.5O4 Cathode Material for High-Rate and High-Voltage Lithium-Ion Batteries

SSRN

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SSRN 2023年

作者： Li, Meixuan Cheng, Jianfeng Weng, Yaqing Liu, Yimeng Zhang, Long Chen, Jian-An Wang, Chunxia Wen, Jiawei Huang, Guoyong Xu, Shengming College of New Energy and Materials China University of Petroleum Beijing102249 China State Key Laboratory of Heavy Oil Processing College of Chemical Engineering China University of Petroleum Beijing102249 China Institute of Applied Chemistry Jiangxi Academy of Sciences Nanchang330029 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing100084 China Beijing Key Lab of Fine Ceramics Tsinghua University Beijing100084 China

The low cost, high operating voltage, and high energy density of LiNi0.5Mn1.5O4 (LNMO) make it a promising candidate for power battery applications. Nevertheless, its poor conductivity and performance at high temperatures limit its further application. In this paper, Al-doped LNMO sample was prepared by a hydrothermal strategy, and the influence of Al doping on the electrochemical characteristics of LNMO was examined employing density functional theory calculations. The density of states computations indicates that the strength of all the spectral bands of Al@LNMO is smaller than those of LNMO pristine material, implying that the incorporation of Al3+ has effectively reduced the overall valence state of LNMO. Energy band calculations demonstrate that the band gap of Al@LNMO (0.0018 eV) is considerably less than that of LNMO (0.5601 eV), indicating that Al doping can significantly improve the conductivity of LNMO. Structural Characterization by XRD and FT-IR illustrates that the crystal structure of the synthesized Al@LNMO is Fd-3m. SEM results show that the morphology of the synthesized Al@LNMO sample is octahedral. In addition, electrochemical cycling tests exhibit that the capacity retention of Al@LNMO after 100 cycles is 82.9% and 79.1% tested at 25 °C and 50 °C, respectively. The capacity retention at 50 °C is similar to that at 25 ℃, which suggests that Al@LNMO has appreciable high-temperature stability. Moreover, the Warburg impedance of Al@LNMO is found small demonstrated by CV test, indicating that Al doping can improve the conductivity of LNMO, which is consistent with density functional theory calculations. © 2023, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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The development of 3D printing technology and the current situation of controlling defects in SLM technology

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China Welding 2020年第3期29卷 9-19页

作者： Yin Yan Zhang Yuan Dong Kaiji Zhang Ruihua Chai Xutian State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China China Iron&Steel Research Institute Group Beijing 100081China Hardware Knife Cut Industrial Technology Research Institute Yangjiang Yangjiang 529533China

With unique manufacturing technology,the additive manufacturing technology divides the three-dimensional object into countless two-dimensional *** with the traditional material reduction manufacturing method,it has the characteristics of saving materials,being fast,and especially suitable for single and small batch parts and the rapid manufacturing of parts with complex shapes and internal *** this paper,various methods of additive manufacturing technology are *** paper introduces the characteristics of selective laser melting technology and its forming equipment *** this basis,the technical defects of selective laser melting technology are analyzed,and the status of controlling defects in SLM technology is *** the end,the prospects of additive manufacturing technology are described.

关键词： additive manufacturing technology selective laser melting density support structure

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