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Nano Research 2024年第6期17卷 5326-5335页

作者： Hao-Wen Zhang Lu-Yao Yang Meng-Lin Huang Ming-Hua Cheng Zhe-Sheng Feng Fanbin Meng Zifeng Lin Yan Wang School of materials and Energy University of Electronic Science and Technology of ChinaChengdu 610054China Laboratory of Advanced Technologies of materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China college of materials science and Engineering Sichuan UniversityChengdu 610065China

Wearable electromagnetic interference(EMI)shielding fabrics with excellent electromagnetic shielding performance,oxidation resistance,and structural stability are highly demanded for the rapid development of electronic devices and wireless *** are metallic conductive materials with exceptional EMI shielding properties,but they are prone to oxidation in air and have poor structural stability and durability on fabric ***,we present a one-step assembly method to fabricate fabrics coated with MXenes and polymeric sodium alginate(SA)composite(MXene-SA).SA protects MXenes from oxidation and forms a stable interlayer structure by bonding to *** MXene-SA coated fabrics are breathable and flexible,and have a low sheet resistance of 2.12±0.08Ω/sq and a high EMI shielding performance of 37.05 dB at X-band,which is comparable to the best 42.31 ***,the MXene-SA coated fabrics exhibit high structural stability and oxidation resistance under various conditions of sonication disintegration,mechanical abuse,chemical corrosion,and humidity,compared to pure MXenes coated *** believe that the wearable and high-performance MXene-SA fabrics have great potential for the next generation of ultra-portable and wearable EMI shielding products.

关键词： MXenes electromagnetic interference shielding fabric one-step assembly

Enhanced Strength-Ductility Synergy in Submerged Friction Stir Processing ER2319 Alloy Manufactured by Wire-Arc Additive Manufacturing via Creating Ultrafine Microstructure

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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 793-807页

作者： Jinpeng Hu Tao Sun Fujun Cao Yifu Shen Zhiyuan Yang Chan Guo college of materials science and Technology Nanjing University of Aeronautics and Astronautics(NUAA)Nanjing 210016China

Submerged friction stir processing(SFSP)with flowing water was employed to alleviate the porosities and coarse-grained structure introduced by wire-arc *** a result,uniform and ultrafine grained(UFG)structure with average grain size of 0.83μm was achieved with the help of sharply reduced heat input and holding time at elevated *** optimized UFG structure enabled a superior combination of strength and ductility with high ultimate tensile strength and elongation of 273.17 MPa and 15.39%.Specifically,grain refinement strengthening and decentralized θ(Al_(2)Cu)phase in the sample subjected to SFSP made great contributions to the enhanced *** addition,the decrease in residual stresses and removal of pores substantially enhance the *** rates of cooling and low temperature cycling,which are facilitated by the water-cooling environment throughout the machining process,are vital in obtaining superior *** work provides a new method for developing a uniform and UFG structure with excellent mechanical properties.

关键词： Submerged friction stir processing Wire-arc additive manufacturing Al-Cu alloy Residual stress Strengthening and toughening mechanism Ultrafine grained microstructure

Chloride molten salt derived attapulgite with ground-breaking electrochemical performance

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Chinese Chemical Letters 2024年第10期35卷 463-467页

作者： Kailong Zhang Chao Zhang Luanhui Wu Qidong Yang Jiadong Zhang Guang Hu Liang Song Gaoran Li Wenlong Cai School of Chemical Engineering Huaiyin Institute of Technology School of materials science and Engineering Nanjing University of Science and Technology college of materials science and Engineering Sichuan University

The existence of adsorbed water and structural water in the crystal structure of attapulgite（ATP） endows it with poor capability to store lithium ions. Herein, the chloride molten salt method was developed to function ATP materials based on theoretical calculations, which exhibit ground-breaking electrochemical performance. After the modification process, the metal ions in chloride molten salt occupy the vertices of the Mg-O octahedral structure from the liberation of structural water and hydroxyl groups in ATP, forming MaMgbAlcSixOy（M = Li, Na, or K）. Using Li Cl molten salt-modified ATP（Li-ATP） as a proof-of-concept,the detailed phase transition, physicochemical properties, and lithium storage capacity were *** to the original ATP, Li-ATP achieves a nearly 7-fold increase in lithium storage capacity（498mAh/g）, featuring a promising low-cost polyanionic type anode material.

关键词： Anode Attapulgite Electrochemical performance Molten salt modification Phase transition

Oxidation behavior of FeV_(2)O_(4)and FeCr_(2)O_(4)particles in the air:Nonisothermal kinetic and reaction mechanism

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International Journal of Minerals,Metallurgy and materials 2024年第8期31卷 1839-1848页

作者： Junyi Xiang Xi Lu Luwei Bai Hongru Rao Sheng Liu Qingyun Huang Shengqin Zhang Guishang Pei Xuewei Lü School of Metallurgy and materials Engineering Chongqing University of Science and TechnologyChongqing 401331China Department of materials science and Engineering Seoul National UniversitySeoul 08826Rep.of Korea college of materials science and Engineering Chongqing UniversityChongqing 400044China

High-temperature oxidation behavior of ferrovanadium(FeV_(2)O_(4))and ferrochrome(FeCr_(2)O_(4))spinels is crucial for the application of spinel as an energy material,as well as for the clean usage of high-chromium vanadium ***,the nonisothermal oxidation behavior of FeV_(2)O_(4)and FeCr_(2)O_(4)prepared by high-temperature solid-state reaction was examined by thermogravimetry and X-ray diffraction(XRD)at heating rates of 5,10,and 15 K/*** apparent activation energy was determined by the Kissinger-Akahira-Sunose(KAS)method,whereas the mechanism function was elucidated by the Malek ***,in-situ XRD was conducted to deduce the phase transformation of the oxidation mechanism for FeV_(2)O_(4)and FeCr_(2)O_(4).The results reveal a gradual increase in the overall apparent activation energies for FeV_(2)O_(4)and FeCr_(2)O_(4)during *** stages of the oxidation process are observed based on the oxidation conversion rate of each *** oxidation mechanisms of FeV_(2)O_(4)and FeCr_(2)O_(4)are complex and have distinct *** particular,the chemical reaction controls the entire oxidation process for FeV_(2)O_(4),whereas that for FeCr_(2)O_(4)transitions from a three-dimensional diffusion model to a chemical reaction *** to the in-situ XRD results,numerous intermediate products are observed during the oxidation process of both compounds,eventually resulting in the final products FeVO_(4)and V2O_(5)for FeV_(2)O_(4)and Fe_(2)O_(3)and Cr_(2)O_(3)for FeCr_(2)O_(4),respectively.

关键词： FeV_(2)O_(4) FeCr_(2)O_(4) oxidation nonisothermal kinetics mechanism

A new route to weak force sensing beyond SQL:Squeezed magnons in cavity magnomechanics

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science China(Physics,mechanics & Astronomy) 2024年第10期67卷 166-167页

作者： S.K.Özdemir Department of Engineering science and mechanics and Materials Research Institute(MRI)The Pennsylvania State UniversityUniversity ParkPA 16802USA

Quantum mechanics imposes limits on measurement accuracy through quantum noise which typically has two components:First is the shot noise originating from vacuum fluctuations and referred to as the imprecision *** is ... 详细信息

关键词： quantum typically vacuum

Thermodynamic equilibrium theory-guided design and synthesis of Mg-doped LiFe_(0.4)Mn_(0.6)PO_(4)/C cathode for lithium-ion batteries

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Journal of Energy Chemistry 2024年第4期91卷 619-627页

作者： Wei Lyu Wenlong Cai Tuan Wang Xiaobo Sun Enhao Xu Jinxuan Chen Kaipeng Wu Yun Zhang college of materials science and Engineering Sichuan UniversityChengdu 610064SichuanChina

Mn-rich LiFe_(1-x)Mn_(x)PO_(4)(x>0.5),which combines the high operation voltage of LiMnPO_(4)with excellent rate performa nce of LiFePO4,is hindered by its sluggish kinetic ***,thermodynamic equilibrium analysis of Mn^(2+)-Fe^(2+)-Mg^(2+)-C_(2)O_(4)^(2-)-H_(2)O system is used to guide the design and preparation of insitu Mg-doped(Fe_(0.4)Mn_(0.6))_(1-x)Mg_(x)C_(2)O_(4)intermediate,which is then employed as an innovative precursor to synthesize high-performance Mg-doped LiFe_(0.4)Mn_(0.6)PO_(4).It indicates that the metal ions with a high precipitation efficiency and the stoichiometric precursors with uniform element distribution can be achieved under the optimized thermodynamic ***,accelerated Li+diffusivity and reduced charge transfer resistance originating from Mg doping are verified by various kinetic *** from the contributions of inherited homogeneous element distribution,small particle size,uniform carbon layer coating,enhanced Li+migration ability and structural stability induced by Mg doping,the Li(Fe_(0.4)Mn_(0.6))_(0.97)Mg_(0.03)PO_(4)/C exhibits splendid electrochemical performance.

关键词： (Fe_(0.4)Mn_(0.6))_(1-x)MgxC_(2)0_(4) precursors Thermodynami cequilibrium Co-precipitation Mg doping Lithium-ion batteries

Synthesis of NO by rotating sliding arc discharge reactor with conical-spiral electrodes

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Plasma science and Technology 2024年第9期26卷 97-108页

作者： Bingyan CHEN Qi LIU Xu LI Chunyang ZHANG Xiangbin GUO Qingzhou YU Zhicheng TANG Xiang HE Wei SU Yongfeng JIANG college of mechanics and Engineering science Hohai UniversityNanjing 211100People’s Republic of China college of Mechanical and Electrical Engineering Hohai UniversityChangzhou 213200People’s Republic of China college of materials science and Engineering Hohai UniversityChangzhou 213200People’s Republic of China college of Information science and Engineering Hohai UniversityChangzhou 213200People’s Republic of China

The present work investigates the potential applications of nitrogen oxides(NO_(x)),particularly nitric oxide(NO)and nitrogen dioxide(NO2),generated through discharge plasma in diverse sectors such as medicine,nitrogen fixation,energy,and environmental *** this study,a rotating sliding arc discharge reactor was initially employed to produce high concentrations of gaseous NO_(x),followed by the utilization of a molybdenum wire redox reactor for NO2-to-NO *** outcomes reveal that the discharge states and generations of NO_(x) are affected by varying parameters,including the applied energies,frequencies and airflow states(1.3-2.6 m/s are the laminar flow,2.6-5.2 m/s are the transition state,5.2-6.5 m/s are the turbulent flow),and the concentrations of NO_(x) within the arc discharge are higher than that in the spark ***,the concentrations of NO,NO2 and NO_(x) gradually increased,and the concentration ratios of NO/NO2 and NO_(x)/NO2 decreased with increasing the applied energy for one cycle from 14.8 mJ to 24.3 ***,the concentrations of NO,NO2 and NO_(x) gradually decreased,and the concentration ratios of NO/NO2 and NO_(x)/NO2 first decreased and then increased with increasing the applied frequencies from 5.0 kHz to 9.0 ***,the concentrations of NO,NO2 and NO_(x) gradually decreased,and the concentration ratios of NO/NO2 and NO_(x)/NO2 first increased and then decreased with increasing the air flow speeds from 1.3 m/s to 6.5 m/***,the concentrations of NO increased and NO2 decreased with increasing temperature from 25°C to 400°C using molybdenum *** findings provide experimental support for the application of plasma in the fields of medicine,nitrogen fixation,energy and environmental protection.

关键词： rotating sliding arc discharge NO_(x) synthesis of NO redox reaction

An active high-static-low-dynamic-stiffness vibration isolator with adjustable buckling beams:theory and experiment

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Applied Mathematics and mechanics(English Edition) 2024年第3期45卷 425-440页

作者： Kefan XU Muqing NIU Yewei ZHANG Liqun CHEN School of science Harbin Institute of TechnologyShenzhen 518055Guangdong ProvinceChina college of Aerospace Engineering Shenyang Aerospace UniversityShenyang 110136China Shanghai Key Laboratory of mechanics in Energy Engineering Shanghai Frontier Science Center of MechanoinformaticsShanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Shanghai Institute of Aircraft mechanics and Control Shanghai 200092China

High-static-low-dynamic-stiffness(HSLDS)vibration isolators with buckling beams have been widely used to isolate external *** active adjustable device composed of proportion integration(PI)active controllers and piezoelectric actuators is proposed for improving the negative stiffness stroke of buckling beams.A nonlinear output frequency response function is used to analyze the effect of the vibration *** prototype of the active HSLDS device is built,and the verification experiment is *** results show that compared with the traditional HSLDS vibration isolator,the active HSLDS device can broaden the isolation frequency bandwidth,and effectively reduce the resonant amplitude by adjusting the active control *** maximum vibration reduction rate of the active HSLDS vibration isolator can attain 89.9%,and the resonant frequency can be reduced from 31.08 Hz to 13.28 ***,this paper devotes to providing a new design scheme for enhanced HSLDS vibration isolators.

关键词： active control high-static-low-dynamic-stiffness(HSLDS) vibration isola-tor dynamic analysis

Investigating the Absorption and Desorption Behavior of Methylene Chloride in the Poly(aryl ether ketone) Film with Different Crystallinities

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Chinese Journal of Polymer science 2024年第2期42卷 239-246,I0009页

作者： Hong-Ru Yang Jin-Dong Zhang Dong-Ting Gao Gang Liu Chun-Hai Chen Jia-Nan Yao Center for Advanced Low-Dimension materials State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai201620China

Poly(aryl ether keton e)(PAEK) films with different crystallinities were obtained by controlling the cooling rate,which were subjected to the absorption and desorption of methylene chloride(CH_(2)Cl_(2)).We employed attenuated total reflection Fourier transform infrared(ATR-FTIR)spectroscopy analyses to investigate the diffusion behavior of CH_(2)Cl_(2) in PAEK films with different *** to the Fickian diffusion model,the calculated diffu sion coefficients of CH_(2)Cl_(2) in PAEK films were observed to decrease with increasing *** effect of CH_(2)Cl_(2)absorption and desorption on the mechanical properties of PAEK films with different crystallinity was further analyzed using tensile *** tensile tests exhibited that CH_(2)Cl_(2) has two concurrent effects:plasticization and solvent-induced *** scanning calorimetry(DSC) and wide-angle X-ray diffraction(WXRD) techniques further confirmed solvent-induced crystallization *** results would be beneficial to understand the solvent resistance of PAEK materials and consequently provide the practical application conditions of PAEK with a theoretical basis.

关键词： Poly(aryl ether ketone) Diffusion behavior Infrared spectra Solvent-induced crystallization Mechanical properties

Surface-neutralization engineered NiCo-LDH/phosphate hetero-sheets toward robust oxygen evolution reaction

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Green Energy & Environment 2024年第7期9卷 1151-1158页

作者： Shunfa Zhou Yuxuan Liu Jing Li Zhao Liu Jiawei Shi Liyuan Fan Weiwei Cai Sustainable Energy Laboratory Faculty of Materials Science and Chemistry China University of Geosciences college of science and Engineering James Cook University

Developing highly active oxygen evolution reaction（OER） electrocatalysts with robust durability is essential in producing high-purity hydrogen through water electrolysis. Layered double hydroxide（LDH） based catalysts have demonstrated efficient catalytic performance toward the relatively sluggish OER. By considering the promotion effect of phosphate（Pi） on proton transfer, herein, a facile phosphate acid（PA）surface-neutralization strategy is developed to in-situ construct NiCo-LDH/NiCoPi hetero-sheets toward OER catalysis. OER activity of NiCoLDH is significantly boosted due to the proton promotion effect and the electronic modulation effect of NiCoPi. As a result, the facilely prepared NiCo-LDH/NiCoPi catalyst displays superior OER catalytic activity with a low overpotential of 300 mV to deliver 100 mA cm-2OER and a Tafel slope of 73 mV dec-1. Furthermore, no visible activity decay is detected after a 200-h continuous OER operation. The present work,therefore, provides a promising strategy to exploit robust OER electrocatalysts for commercial water electrolysers.

关键词： Oxygen evolution reaction Phosphate Layered double hydroxide Hetero-sheets Stability