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Oscillation Modes of Weld Pool in Stationary GTA Welding Using Structure Laser Method

Chinese Journal of Mechanical Engineering 2021年第5期34卷 243-258页

作者： Xingpei Wu Jiankang Huang Jing He Shien Liu Guangyin Liu Ding Fan School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China Department of Mechanical Energy Engineering Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of TechnologyLanzhou 730050China

Researchers have recently attempted to monitor pool oscillations using the three-dimensional laser vision ***,the deficiency of simulation software will result in significant capital *** simulations and experiments are performed in this study,and the Bessel equation is used to analyze the oscillation mode of a weld *** laser dot matrix images of(0,1),(1,1),(2,1),and(0,2)oscillation modes at different times are obtained via structured laser optical measurement *** oscillation mode of a stationary gas tungsten arc weld pool is analyzed based on laser dot matrix images obtained from a structure laser *** show that the simulated laser dot matrix images are consistent with the experiment *** oscillation mode of the weld pool can be recognized based on the laser dot matrix *** study not only provides conditions for assessing the penetrating state of a weld pool,but also enable a further understanding of the oscillation mode of a weld pool and the development of more effective observation methods and measurement tools to effectively control and improve welding quality.

关键词： Weld pool surface GTA welding Bessel function Oscillation mode Geometric optics

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The Influence of Alkaline Earth Elements on Electronic Properties ofα-Si3N4 via DFT Calculation

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Journal of Wuhan University of technology(materials Science) 2020年第5期35卷 863-871页

作者： ZHANG Jianwen HUANG Zhifeng YIN Ziqian LI Meijuan CHEN Fei SHEN Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan430070China

We used density functional theory(DFT)calculations to study the influence of alkali earth metal element(AE)doping on the crystal structure and electronic band structure ofα-*** diversity of atomic radii of alkaline earth metal elements results in structural expansion when they were doped into theα-Si3N4 *** energies of the doped structures indicate that dopants prefer to occupy the interstitial site under the nitrogen-deficient environment,while substitute Si under the nitrogen-rich environment,which provides a guide to synthesizingα-Si3N4 with different doping types by controlling nitrogen *** electronic structures,energy levels of the dopants appear in the bottom of the conduction band or the top of the valence band or the forbidden band,which reduces the bandgap ofα-Si3N4.

关键词： first-principles density functional theory calculations alkaline earth elements dopedα-Si3N4 photoluminescence material crystal structure electronic structure

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Room Temperature synthesis of Vertically Aligned Amorphous Ultrathin NiCo-LDH Nanosheets Bifunctional Flexible Supercapacitor Electrodes

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Energy & Environmental materials 2024年第2期7卷 277-286页

作者： Kwadwo Asare Owusu Zhaoyang Wang Ali Saad Felix Ofori Boakye Muhammad Asim Mushtaq Muhammad Tahir Ghulam Yasin Dongqing Liu Zhengchun Peng Xingke Cai Institute for Advanced Study Shenzhen UniversityShenzhen 518060China College of Physics and Optoelectronics Shenzhen University3688 Nanhai BoulevardNanshan DistrictShenzhen 518060China School of Chemistry and Materials Science Hubei Engineering UniversityNo.272 Traffic AvenueXiaogan 432000China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyNo.122 Luoshi RoadWuhan 430070China Key Laboratory of Green Printing CAS Research Centre for Excellence in Molecular ScienceInstitute of Chemistry Chinese Academy of Sciences(ICCAS)Beijing 100190China College of Mechatronics and Control Engineering Shenzhen University3688 Nanhai BoulevardNanshan DistrictShenzhen 518050China

Developing a simple scalable method to fabricate electrodes with high capacity and wide voltage range is desired for the real use of electrochemical ***,we synthesized amorphous NiCo-LDH nanosheets vertically aligned on activated carbon cloth substrate,which was in situ transformed from Co-metal-organic framework materials nano-columns by a simple ion exchange process at room *** to the amorphous and vertically aligned ultrathin structure of NiCo-LDH,the NiCo-LDH/activated carbon cloth composites present high areal capacities of 3770 and 1480 mF cm^(-2)as cathode and anode at 2 mA cm^(-2),and 79.5%and 80%capacity have been preserved at 50 mA cm^(-2).In the meantime,they all showed excellent cycling performance with negligible change after>10000 *** fabricating them into an asymmetric supercapacitor,the device achieves high energy densities(5.61 mWh cm^(-2)and 0.352 mW cm^(-3)).This work provides an innovative strategy for simplifying the design of supercapacitors as well as providing a new understanding of improving the rate capabilities/cycling stability of NiCo-LDH materials.

关键词： amorphous nanosheets aqueous supercapacitor high volumetric/areal energy density NiCo-LDH room temperature synthesis

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Optical limiting performances of transitional metal dichalcogenides MX_(2)(M = V, Nb, Ta;X = S, Se) with ultralow initial threshold and optical limiting threshold

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Chinese Optics Letters 2022年第2期20卷 131-135页

作者： Chenglu Liang Enze Wang Xian Li Jing Wang Yijun Liu Binyi Chen Hongxiang Chen Yang Liu Xiangfang Peng Department of Materials Science and Engineering Fujian University of TechnologyFuzhou 350108China Center for Advanced Energy and Functional Materials Fujian University of TechnologyFuzhou 350108China State Key Laboratory of Polymer Materials Engineering Sichuan UniversityChengdu 610207China State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China

The optical limiting performances of few-layer transitional metal dichalcogenides (TMDs) nanosheets in the VB group(VS_(2),VSe_(2),NbS_(2),NbSe_(2),TaS_(2),and TaSe_(2)) were systematically investigated for the first time,to the best of our *** was found that these TMDs nanosheets showed a normalized transmittance in the range of 20%–40%at the input energy of 1.28 GW/cm^(2).Ultralow initial threshold F_(S)(0.05–0.10 J/cm^(2)) and optical limiting threshold F_(OL)(0.82–2.23 J/cm^(2)) were achieved in the TMDs nanosheets,which surpassed most of the optical limiting *** work showed the potential of TMDs beyond MoS_(2)in optical limiting field.

关键词： optical limiting transitional metal dichalcogenide initial threshold optical limiting threshold

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Amorphous Titanium Dioxide and Polyaniline Dual Modifying Silicon for Highly Enhanced Lithium-Ion Storage

SSRN

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SSRN 2024年

作者： Li, Yu Shi, Wen-Hua Yin, Zhi-Wen Wang, Meng Liu, Jing Hu, Zhi-Yi Li, Bei Chen, Li-Hua Su, Bao-Lian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China Wuhan University of Technology Hubei Wuhan430070 China School of Materials Science and Engineering Research Center for Materials Genome Engineering Wuhan University of Technology Hubei Wuhan430070 China University of Namur NamurB-5000 Belgium

Silicon (Si) anode material is promising in the next generation of lithium-ion batteries (LIBs) with high energy densities for its much higher capacity (4200 mAh/g) than that of commercial graphite (372 mAh/g). However, silicon anode material with low electronic conductivity suffers a huge volume variation and accompanies side reactions during alloyed and de-alloyed process. Here, we design an inner amorphous titanium dioxide (TiO2) and an outer flexible conductive polyaniline (PANI) network dual modified Si@TiO2@PANI material for LIBs, where the TiO2 avoids the side reactions and the PANI network layer buffers the volume expansion and increases the electronic conductivity. The as-prepared Si@TiO2@PANI exhibits a high initial discharge capacity of 3050 mAh/g and maintains 1583 mAh/g after 200 cycles at 0.5 A/g. It even delivers the discharge capacity of 1002 mAh/g after 600 cycles at 1 A/g, as well as an excellent rate ability with discharge capacity of 1890, 1260 and 432 mAh/g at the high current density of 1, 2 and 5 A/g, respectively. Our strategy shows that the innovative design of double buffer layers on Si can synergistically promote stability and accelerate kinetics of Li+ transport, offering novel resolution strategy to enhance the performance of Si-based anodes for LIBs. © 2024, The Authors. All rights reserved.

关键词： Titanium dioxide

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Enhanced photoresponse of Ti0_(2)/MoS_(2)heterostructure phototransistors by the coupling of interface charge transfer and photogating

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Nano Research 2021年第4期14卷 982-991页

作者： Bingxu Liu Yinghui Sun Yonghuang Wu Kai Liu Huanyu Ye Fangtao Li Limeng Zhang Yong Jiang Rongming Wang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface ScienceSchool of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

Two-dimensional(2D)MoS_(2)with appealing physical properties is a promising candidate for next-generation electronic and optoelectronic devices,where the ultrathin MoS_(2)is usually laid on or gated by a dielectric oxide *** oxide/MoS_(2)interfaces widely existing in these devices have significant impacts on the carrier transport of the MoS_(2)channel by diverse interface *** design of the oxide/MoS_(2)interfaces would provide an effective way to break through the performance limit of the 2D devices but has yet been well ***,we report a high-performance MoS_(2)-based phototransistor with an enhanced photoresponse by interfacing few-layer MoS_(2)with an ultrathin Ti0_(2)*** Ti0_(2)is deposited on MoS_(2)through the oxidation of an e-beam-evaporated ultrathin Ti *** a visible-light illumination,the fabricated Ti0_(2)/MoS_(2)phototransistor exhibits a responsivity of up to 2,199 A/W at a gate voltage of 60 V and a detectivity of up to 1.67×10^(13)Jones at a zero-gate voltage under a power density of 23.2μW/mm^(2).These values are 4.0 and 4.2 times those of the pure MoS_(2)*** significantly enhanced photoresponse of Ti0_(2)/MoS_(2)device can be attributed to both interface charge transfer and photogating *** results not only provide valuable insights into the interactions at Ti0_(2)/MoS_(2)interface,but also may inspire new approach to develop other novel optoelectronic devices based on 2D layered materials.

关键词： MoS_(2) heterojunction photodetector charge injection photocurrent

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B-Site Nanoscale-Ordered Structure Enables Ultra-High Tunable Performance

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Research 2023年第1期2022卷 413-426页

作者： Biaolin Peng Qiuping Lu Yi-Chi Wang Jing-Feng Li Qi Zhang Haitao Huang Laijun Liu Chao Li Limei Zheng Zhong Lin Wang ISchool of Advanced Materials and Nanotechnology Xidian UniversityXi'an 710126China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Basque Centre for Materials Applications and NanostructuresUPV/EHU Science ParkBarrio Sarriena s/n48940 LeioaSpain kerbasque Basque Foundation for SciencePlaza Euskadi5Bilbao 48009Spain Department of Applied Physics The Hong Kong Polytechnic UniversityKowloonHong Kong Guangxi Key Laboratory of Optical and Electronic Materials and Devices Guilin University of TechnologyGuilin 541004China Instrument Analysis Center Xi'an Jiaotong UniversityXi'an 710049China 'School of Physics Shandong UniversityJinan 250100China school of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGeorgia 30332-0245USA

Tunable devices constructed by ferroelectric thin flms are often desired to possess a low dielectric loss while maintainging a high dielectric tunability over a broad operating temperature range in applications,for example,resonators,filters,or phase ***,it is dificult to simultaneously achieve these characteristics by traditional strategies,such as doping and strain ***,we demonstrate that the dielectric tunability of the sol-gel-prepared Pb(Sc_(1/2)Nb_(1/2))_(0.9)(Mg_(1/3)Nb_(2/3))_(0.O3)(PSNMN)thin film can be almost doubled from~47%to~80.0%(at 10kHz)at a low electric field(~530kV/cm),and the dielectric loss can be sharply reduced by more than an order of magnitude,from~0.50 to~0.037(at 1 kHz)when the thin flm was annealed in air at 650℃ for 15h under the help of an atmosphere-compensating-block(ACB)made from the proto-PSNMN ***,the PSNMN thin flm annealed with ACB also exhibited an extremely high thermally-stable dielectric tunability in an ultrabroad temperature range(>130 K),which could be attributed to the Maxwell-Wagner(MW)effect generated by the interface between the PSNMN disordered matrix and the B-site nanoscale-ordered structure formed during the long-term annealing *** reduced dielectric loss is mainly benefited from the reduced concentration of oxygen vacancy and the possibie MW efects,and the enhanced dielectric tunability could be ascribed to the weaker domain-pinning effect by oxygen *** breakthrough provides a new universal strategy to achieve utrahigh tunable performance in A(B'_(1/2)B"_(1/2))O3 ferroelectric thin films with a B-site nanoscale-ordered structure,meanwhile it paves the way for ultraintergrated tunable thin-flm-devices with great phase shifter performance in practical applications.

关键词： dielectric ferroelectric breakthrough

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Full-Scaling Friction and Wear Laws of Nanotwinned Metals

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Physical Review Letters 2025年第16期134卷 166201-166201页

作者： Yan Lin Ziyue Zhang Fenghui Duan Fangming Wang Fei Liang Qicheng Zhang Yong Li Jie Pan Keke Chang Yonghao Zhao Yuntian Zhu Xiang Chen Nano and Heterogeneous Materials Center School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing China Department of Materials Science and Engineering City University of Hong Kong Hong Kong China State Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo China State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan China School of Materials Science and Engineering Hohai University Changzhou China

Ultrastrong nanotwinned (NT) metals hold promise for mitigating friction and wear—essential for enhancing the energy efficiency and longevity of all moving systems. However, optimizing their tribological performance has long suffered from the absence of friction and wear laws across varying tribological loading scales. Here, we have discovered full-scaling twin lamella spacing (λ)-dependent friction and wear laws in NT pure nickel and identified critical deformation mechanisms for reducing friction and wear. Nanoscale friction initially increases with decreasing λ, peaking at 20 nm, and then decreases due to a transition from dislocation-twin boundary interactions to detwinning. Under microscale loading, friction and wear reduce linearly with decreasing λ, attributed to an unforeseen phase transition from face-centered cubic to hexagonal close-packed structures. Furthermore, under macroscale loading, the formation of a durable oxide layer and a stable gradient nanostructure in nanotwinned nickel with λ exceeding 20 nm aids in mitigating wear loss.

关键词： Nickel

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Ionic Liquid-Grafted Mxene Composite Polymer Electrolytes for High-Performance Solid-state Batteries

SSRN

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SSRN 2025年

作者： Li, Yu Qian, Zhi Qiu, Zhao-Dong Wang, Rui-Qing Wei, Mei-Tong Fei, An-Min Hu, Zhi-Yi Mohamed, Hemdan S.H. Chen, Li-Hua Su, Bao-Lian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Wuhan University of Technology Wuhan430070 China Physics Department Faculty of Science Fayoum University El Gomhoria Street Fayoum63514 Egypt University of Namur NamurB-5000 Belgium

All-solid-state batteries (ASSBs) have obtained much attention due to the high energy density and security. At present, PEO-based solid-state batteries are considered to be one of the most promising candidates for high-performance ASSBs due to the excellent processability and good interfacial stability. However, low ionic conductivity and Li+ transference number seriously hinder their progress in practical applications. Here, a novel filler is developed by embedding ionic liquid (IL) grafted onto the surface of MXene to improve the electrochemical performance of PEO-based solid composite polymer electrolyte (MXene-IL-SPE) for ASSBs. The 2D MXene can significantly reduce the crystallinity of PEO, and the presence of IL not only enhances the dispersion of MXene in the polymer matrix, but also promotes the dissociation of lithium salts and anchors anions. As a result, the MXene-IL-SPE possesses high ionic conductivity (7.19 × 10-4 S cm-1) and Li+ transference number (0.51), together with wide electrochemical window (5.2 V) at 60 °C. The assembled LiFePO4|MXene-IL-SPE|Li full cell exhibits remarkable rate capability and exceptional capacity of 154.8 mAh g-1 over 120 cycles with an impressive 95.3% capacity retention at 0.5 C. This design opens up a new way to prepare high performance CPEs for ASSBs. © 2025, The Authors. All rights reserved.

关键词： Solid-state Batteries

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基于机器学习的Fe/Y协同调控抗氨Pt基HOR催化剂用于高效氢气纯化（英文）

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Science China materials 2025年

作者：赵焱申王小青王锐吴芳林段文婧李皓唐浩林 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology National Energy Key Laboratory for New Hydrogen-ammonia Energy Technologies School of Biological and Chemical Engineering Zhejiang University of Science and Technology School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology Catalonia Institute for Energy Research (IREC) Sant Adrià de Besòs Hubei Key Laboratory of Fuel Cell

开发具有更强氨耐受性的高效电催化剂对于氢电化学氢泵的发展至关重要.本研究利用机器学习和夏普利相加解释法确定了两种具有耐氨潜力的过渡金属Fe和Y.随后,通过使用这两种过渡金属对铂的电子结构进行了调节.在此过程中,Fe凭借其优异的...

开发具有更强氨耐受性的高效电催化剂对于氢电化学氢泵的发展至关重要.本研究利用机器学习和夏普利相加解释法确定了两种具有耐氨潜力的过渡金属Fe和Y.随后,通过使用这两种过渡金属对铂的电子结构进行了调节.在此过程中,Fe凭借其优异的催化能力,促进了PtY合金的形成.这种改性显著减少了氨的吸附,增强了抗氨中毒能力,同时提高了氢氧化反应活性.采用双过渡金属调控的电催化剂（FeY-Pt-C,20%Pt）的质量活性为1071 mA mgPt-1,是Pt-C催化剂（20%Pt）的2.23倍.值得注意的是,即使在5000 ppmNH3的影响下,FeY-Pt-C仍能保持其93.1%的初始电催化活性,显示出卓越的抗氨中毒能力.因此,这项研究为HOR催化剂在氢氨分离领域中的应用提供了见解.

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