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Influence of UVB-Irradiation on the Structures and Solid Particle Erosion Resistance for CF/PC Composites

Journal of materials Science and Chemical Engineering 2020年第6期8卷 1-7页

作者： Mei Fang Yuji Ma Na Zhang Ming Huang Jose Castro Xianhu Liu Chuntai Liu Changyu Shen National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou University Zhengzhou China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian China Department of Integrated Systems Engineering The Ohio State University Columbus USA

The service life and properties of Carbon fiber reinforced polycarbonate (CF/PC) composites are seriously affected by ultraviolet radiation from outdoor exposure during aging. In this work, the changes of structure and solid particle erosion resistance for CF/PC composites after ultraviolet irradiation were studied. It was shown that ultraviolet irradiation causes photo-oxygen aging and photo-fries re-arrangement of the composite, and the result was confirmed by FTIR. We correlated the solid particle erosion resistance with aging time, and found that the solid particle erosion resistance of CF/PC composites greatly decreased by UVB irradiation during 15 hours. Furthermore, the eroded material surface was analyzed using scanning electron microscope (SEM). It suggests that ultraviolet aging leads to plasticization and degradation, resulting in reduction of erosion resistance of the composite.

关键词： Polymeric Composites Sand Erosion UVB Irradiation FTIR

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AZ91D magnesium alloy with excellent strength-ductility relationship fabricated via laser powder-bed-fusion

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Journal of Alloys and Compounds 2025年 1030卷

作者： Li, Wei Mo, Wenlong Li, Jikang Shi, Hai Yuan, Hongwei Wei, Qingsong Li, Simeng Shi, Yusheng Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science and Technology Wuhan43008 China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan430081 China Precision Manufacturing Institute Wuhan University of Science and Technology Wuhan430081 China State key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Guizhou Aerospace Fenghua precision equipment Co. Ltd 550009 China Gemological Institute China University of Geosciences Wuhan430074 China

In this paper, AZ91D magnesium alloy with weak basal texture, fine grains, high-density dislocations and nano-precipitates had been fabricated via laser powder-bed-fusion (L-PBF). Due to these special microscopic characteristics, the L-PBF AZ91D alloy exhibited excellent strength-ductility relationship, with the yield strength (YS), ultimate tensile strength (UTS) and uniform elongation (UE) were 221 ± 8 MPa, 292 ± 11 MPa and 7.5 ± 0.7 %. After artificial aging at 200 °C for 12 h, the YS and UTS were improved to 236 ± 10 MPa and 332 ± 14 MPa, while kept a reasonable UE of 5.7 ± 0.3 %. Owing to its exceptional mechanical properties, large-scale AZ91D components with cylindrical geometries have been manufactured via L-PBF, achieving technology Readiness Level 5 (TRL5). The high strength and ductility of the L-PBF-fabricated AZ91D alloy primarily stem from its pronounced work hardening capacity, which arises from the combined effects of grain boundary strengthening, dislocation strengthening, texture strengthening, and precipitation strengthening. To quantify these contributions, this work systematically investigates the individual strengthening mechanisms: In the as-built condition (S1), grain boundary strengthening accounts for a substantial portion of the strength, whereas in the artificially aged condition (S2), precipitation strengthening becomes dominant, with its contribution increasing from 32.47 % to 40.17 %. This study not only proposes a novel strategy for producing AZ91D alloys with superior mechanical performance through L-PBF but also provides critical insights into understanding the strengthening mechanisms of L-PBF processed AZ91D alloys. © 2025 Elsevier B.V.

关键词： Strain hardening

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Anchoring carbon shells encapsulated RuMn nanoparticles on N-doped carbon nanofibers for efficient hydrogen evolution reaction

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Chemical Engineering Journal 2025年

作者： Jibiao Guan Jiadong Chen Yingjing Zhu Lina Wang Baochun Guo Yaqin Fu Juan Wang Ming Zhang National Engineering Lab for Texile Fiber Materials and Processing Technology Zhejiang Sci-Tech University Hangzhou 310018 China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale Optoelectronics Shenzhen University Shenzhen 518060 China Department of Polymer Materials and Engineering South China University of Technology Guangzhou 510640 China Wenzhou Key Lab of Advanced Energy Storage and Conversion Zhejiang Province Key Lab of Leather Engineering College of Chemistry and Materials Engineering Wenzhou University Wenzhou Zhejiang 325035 China

Understanding the core-shell structure of carbon-encapsulated alloys aids in enhancing catalyst stability. DFT simulations reveal that the intrinsic electric field of the alloy modulates carbon atom behavior, effectively lowering the Gibbs free energy required for water dissociation and hydrogen adsorption on the carbon surface. Carbon-encapsulated RuMn alloy nanoparticles supported on carbon nanofibers (RuMn/CNFs) was fabricated as self-supporting electrode materials to validate this conclusion via a synergistic electrospinning‑carbonization protocol. The rational design of Ru/Mn stoichiometric modulation synergized with carbon nanofiber's superior electrical conductivity and RuMn/CNFs' hydrophilic-hydrophobic dual functionality endows the catalyst with exceptional alkaline hydrogen evolution performance. Specifically, the optimized RuMn/CNFs achieves a remarkably low overpotential of 80 mV at 100 mA cm −2 coupled with an Tafel slope of 46.3 mV dec −1 . Analysis of surface morphology, internal structure, and changes in metal ion concentration in the electrolyte over various hydrogen production times revealed that Mn atoms, with lower electronegativity, leach from the graphite carbon-encapsulated alloy core-shell structure, creating defects on the surface of the RuMn alloy core. Atomic-scale interfacial interactions between RuMn lattice defects and the carbon shell orchestrate two synergistic effects: (1) enhance the adsorption of water onto the carbon shell, and (2) a 47 % reduction in water dissociation energy barriers (DFT-calculated). This dual modulation drives ultrafast Volmer step kinetics, endowing RuMn/CNFs with a good activity enhancement over pristine counterparts at industrial current densities (2.3 V at 500 mA cm −2 ). This work establishes a mechanistic framework for understanding dynamic interface reconstruction in carbon-encapsulated electrocatalysts, offering critical insights into operando structural evolution patterns and active site generation me

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Ethylamine gas sensing properties of SnO2/rGO nanocomposite materials 6

Ethylamine gas sensing properties of SnO2/rGO nanocomposite ...

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2019 6th International Conference on advanced Composite materials and Manufacturing Engineering, ACMME 2019

作者： Huang, Shanshan Song, Jian Huang, Kaijin School of Physics Northeast Normal University Changchun130024 China State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan430074 China

Ethylamine has been widely used in production and life, but it needs to be monitored in real-time because of its important harm to human health. In this study, an SnO2/rGO nanocomposite gas sensitive material was synthesized by hydrothermal method, and the gas-sensing properties of ethylamine were tested by a self-made gas sensitivity test platform. The results show that the SnO2/rGO nanocomposite materials have good gas-sensitive performance of ethylamine and low detection limit (up to 1 ppm). Finally, the mechanism of gas sensitivity is proposed. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Chemical detection

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Frontispiz: Interfacially Ordered NiCoMoS Nanosheets Arrays on Hierarchical Ti3C2TxMXene for High-Energy-Density Fiber-Shaped Supercapacitors with Accelerated Pseudocapacitive Kinetics

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Angewandte Chemie 2024年第36期136卷

作者： Xiaotong Mei Dr. Chao Yang Fangyuan Chen Yuting Wang Dr. Yang Zhang Dr. Zengming Man Prof. Wangyang Lu Prof. Jianhong Xu Prof. Guan Wu National Engineering Lab for Textile Fiber Materials and Processing Technology School of Materials Science and Engineering Zhejiang Sci-Tech University Hangzhou 310018 P. R. China Zhejiang Provincial Innovation Center of Advanced Textile Technology Shaoxing 312000 P. R. China The State Key Laboratory of Chemical Engineering Department of Chemical Engineering Tsinghua University Beijing 100084 P. R. China

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Interfacially Ordered NiCoMoS Nanosheets Arrays on Hierarchical Ti3C2TxMXene for High-Energy-Density Fiber-Shaped Supercapacitors with Accelerated Pseudocapacitive Kinetics

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Angewandte Chemie 2024年第36期136卷

Balancing electrochemical activity and structural reversibility of fibrous electrodes with accelerated Faradaic charge transfer kinetics and pseudocapacitive storage are highly crucial for fiber-shaped supercapacitors (FSCs). Herein, we report novel core–shell hierarchical fibers for high-performance FSCs, in which the ordered NiCoMoS nanosheets arrays are chemically anchored on Ti 3 C 2 T x fibers. Beneficial from architecting stable polymetallic sulfide arrays and conductive networks, the NiCoMoS−Ti 3 C 2 T x fiber maintains fast charge transfer, low diffusion and OH − adsorption barrier, and stabilized multi-electronic reaction kinetics of polymetallic sulfide. Consequently, the NiCoMoS−Ti 3 C 2 T x fiber exhibits a large volumetric capacitance (2472.3 F cm −3 ) and reversible cycling performance (20,000 cycles). In addition, the solid-state symmetric FSCs deliver a high energy density of 50.6 mWh cm −3 and bending stability, which can significantly power electronic devices and offer sensitive detection for dopamine.

关键词： Transition polymetallic sulfide nanosheets Core-shell hierarchical fiber Flexible supercapacitors Wearable applications

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Effects of high-pressure rheo-squeeze casting on the Fe-rich phases and mechanical properties of Al-17Si-(1,1.5)Fe alloys

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International Journal of Minerals,Metallurgy and materials 2018年第9期25卷 1018-1026页

作者： Chong Lin Shu-sen Wu Shu-lin Lü Ping An He-bao Wu State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Hubei Provincial Key Laboratory of Chemical Equipment Intensification and Intrinsic Safety Wuhan Institute of Technology

The effects of high pressure rheo-squeeze casting(HPRC) on the Fe-rich phases(FRPs) and mechanical properties of Al-17 Si-(1,1.5)Fe alloys were investigated. The alloy melts were first treated by ultrasonic vibration(UV) and then formed by high-pressure squeeze casting(HPSC). The FRPs in the as-cast HPSC Al-17 Si-1 Fe alloys only contained a long, needle-shaped β-Al5 Fe Si phase at 0 MPa. In addition to the β-Al5 Fe Si phase, the HPSC Al-17 Si-1.5 Fe alloy also contained the plate-shaped δ-Al4 Fe Si2 phase. A fine, block-shaped δ-Al4 Fe Si2 phase was formed in the Al-17 Si-1 Fe alloy treated by UV. The size of FRPs decreased with increasing pressure. After UV treatment, solidification under pressure led to further refinement of the FRPs. Considering alloy samples of the same composition, the ultimate tensile strength(UTS) of the HPRC samples was higher than that of the HPSC samples, and the UTS increased with increasing pressure. The UTS of the Al-17 Si-1 Fe alloy formed by HPSC exceeded that of the Al-17 Si-1.5 Fe alloy formed in the same manner under the same pressure. Conversely, the UTS of the Al-17 Si-1 Fe alloy formed by HPRC decreased to a value lower than that of the Al-17 Si-1.5 Fe alloy formed in the same manner.

关键词： high pressure rheo-squeeze casting Al-17Si-(1,1.5)Fe alloys Fe-rich phases mechanical properties

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synthesis of PEI-Functionalized Magnetic Nanoparticles for Capturing Bacteria

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Journal of Wuhan University of technology-Mater. Sci. Ed. 2019年第1期34卷 236-242页

作者： Chen, Baoli Xie, Hao Zhang, Ao Liu, Nian Li, Qichang Guo, Junhui Su, Baolian School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Laboratory of Inorganic Materials Chemistry University of Namur Namur Belgium

Polyethyleneimine (PEI) functionalized Fe3O4 MNPs were synthesized by a modified hypothermal oxidative hydrolysis method. The magnetic nanoparticles showed positively charged surface, strong magnetic responsivity and uniform particle size distribution at 56.1±0.6 nm. Aggregation of these magnetic nanoparticles were observed on the surface of different type of bacteria. Magnetic capturing of bacteria were facilitated by these magnetic nanoparticles. The capturing efficiency could reach 90% after two rounds of interactions of 5 minutes. The mechanism and process of interactions between bacteria and polyethyleneimine functionalized Fe3O4 magnetic nanoparticles were explored and discussed. The present study not only provides insight into interactions between Fe3O4@PEI MNPs and bacterial cells, but also opens a new avenue for designing and applying Fe3O4@PEI MNPs as biosensors in microbiology, medicine, and environmental science.

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Structure of triplite LiFeSO 4F powder synthesized through an ambient two-step solid-state route

Structure of triplite LiFeSO 4F powder synthesized through a...

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作者： Ma, F.-F. Mao, J.-W. Shao, G.-Q. Fan, S.-H. Zhu, C. Zhang, A.-L. Xie, G.-Z. Gu, J.-N. Yan, J.-L. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan430070 China

The triplite LiFeSO4F displays both the highest potential ever reported for an Fe-based compound, as well as a comparable specific energy with that of popular LiFePO4. The synthesis is still a challenge because the present approaches are connected with long time, special equipments or organic reagents, etc. In this work, the triplite LiFeSO4F powder was synthesized through an ambient two-step solid-state route. The reaction process and phase purity were analyzed, coupled with structure refinement and electrochemical test. © Copyright International Centre for Diffraction Data 2018.

关键词： Iron compounds

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Regulating the electron affinity of NiMo/Al 2 O 3 to enhance ultra-deep hydrodesulfurization of diesel

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Applied Catalysis B: Environment and Energy 2025年 378卷

作者： Jixing Liu Yufeng Liu Yan Wang Wenfang Zhang Shuqin Liang Feng You Huifang Cheng Peng Zheng Peiwen Wu Jian Liu Wenshuai Zhu School of Chemistry and Chemical Engineering Jiangsu University Zhenjiang 212013 PR China Hubei Key Laboratory of Plasma Chemistry and Adv. Mater. Wuhan Institute of Technology 206 Guanggu 1st Road Wuhan 430205 PR China Shandong Provincial Key Laboratory of Monocrystalline Silicon Semiconductor Materials and Technology Dezhou University Dezhou 253023 PR China Key Laboratory on Resources Chemicals and Materials of Ministry of Education Shenyang University of Chemical Technology Shenyang 110142 PR China State Key Laboratory of Heavy Oil Processing China University of Petroleum (Beijing) Beijing 102249 PR China

It remains one of the great challenges to enhance the ultradeep hydrodesulfurization (HDS) performances of commercial NiMo/Al 2 O 3 catalysts while reducing the Mo usage in the petrochemical industry hitherto. Herein, we elaborately designed and synthesized a series of transition metals (Mn, Fe, Zn) modified NiMo/Al 2 O 3 catalysts via a facile impregnation method, and their HDS performances were evaluated with the model diesel containing 500 ppm of 4,6-DMDBT. The results showed that the substitution of partial Mo by transition metals significantly promoted the dispersion and enhanced the reduction of active metal oxides, thereby facilitating the transformation of MoO 3 to the MoS 2 and thereafter more Ni atoms incorporating into MoS 2 crystal to form the “Type-II” NiMoS active phase. Moreover, the introduction of transition metals markedly modulated the d-band center of Mo and increased the Lewis (L) acid density of NiMMo/Al 2 O 3 (M = Mn, Fe, Zn) catalysts because of the stronger electronic capability of these transition metals than that of Mo. Thus, the adsorption capacity of sulfur-containing molecules at active sites as well as the HYD pathway and 4,6-DMDBT conversion were remarkably improved. Therein, NiFeMo/Al 2 O 3 exhibits the optimal HDS performance with 98.5 % 4,6-DMDBT removal due to the highest Mo sulfidation and NiMoS ratio, as well as the most L acid sites and largest f Mo . This work unveils the effect of transition metal doping on the active phase structure and catalytic performance of NiMo/Al 2 O 3 for HDS of diesel and therefore offers important guidance for the design and preparation of more efficient HDS material in the future.

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