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Design and Dynamic Experiment of Al-Cu Graded materials Impactor with Strain Rate of 10^(4)–10^(5)/s

稀有金属材料与工程 2025年第3期54卷 581-586页

作者： Hu Jianian Zhou Zizheng Li Yidi Chen Xiang Yang Gang Liu Jintao Zhang Jian State Key Laboratory of Precision Blasting Jianghan UniversityWuhan 430056China Hubei Key Laboratory of Blasting Engineering Jianghan UniversityWuhan 430056China Luoyang Ship Material Research Institute Luoyang 471023China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Based on simplified calculations of one-dimensional wave systems,loading pressure platform curves of Al-Cu gradient materials(GMs)impactor were *** Al-Cu GMs were prepared using tape-pressing sintering,and their acoustic properties were characterized to match the design *** parallelism of the Al-Cu GM was confirmed using a three-dimensional surface profilometry machine.A one-stage light-gas gun was used to launch the Al-Cu GM,impacting an Al-LiF target at a velocity of 400 m/*** results of the experimental strain rate demonstrate that the Al-Cu GMs can realize the precise control of the strain rate within the range of 10^(4)‒10^(5)/s in the high-speed impact experiments.

关键词： high strain rate Al-Cu graded materials impactor acoustic impedance gas gun experiment

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Hemoglobin-decorated metal polyphenol network platform featuring antibacterial, antioxidant, and oxygen carrying properties for promoting infected diabetic wound healing

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International Journal of Biological Macromolecules 2025年第Pt 1期311卷 143695页

作者： Hu, Haonan Tan, Guitao He, Huan Zhang, Qinqin Tu, Jing State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan430070 China College of Resources and Environment Huazhong Agricultural University Wuhan430070 China

Chronic wounds have emerged as a formidable challenge in diabetes management, leading to high morbidity and mortality. The diabetic wound healing is often impaired due to recurrent bacterial infections, excessive reactive oxygen species (ROS), and severe hypoxia. Thus, we developed a multifunctional nanoplatform that exhibited remarkable antibacterial activity, ROS scavenging and oxygen-carrying properties. Metal-phenol network (MPN) as core material was synthesized by assembling tannic acid (TA) with Fe2⁺ via coordination and hydrophobic interactions. Subsequently, hemoglobin (Hb) was decorated onto MPN surface through cation-π interactions. MPN protected Hb against oxidation and preserved its physiological function, facilitating oxygen transport. Moreover, MPN-Hb displayed robust and broad-spectrum antioxidant activity that can effectively scavenge ROS and reactive nitrogen species. Under near-infrared (NIR) irradiation, MPN-Hb demonstrated excellent bactericidal activity against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), effectively eradicated biofilms through hyperthermia. In vivo studies have shown that MPN-Hb with good biocompatibility could effectively eliminate bacteria at the wound site, mitigate the inflammatory response, and promote collagen deposition and angiogenesis, thereby accelerating wound healing. Overall, this multifunctional nanoplatform offers a straightforward, safe, and efficient therapeutic strategy for treating chronic diabetic wounds. © 2025 Elsevier B.V.

关键词： Escherichia coli

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Trace of Atomically Dispersed Pd Enables Unprecedented Butadiene Semihydrogenation Performance Over Copper Catalyst

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ACS Catalysis 2025年第5期15卷 3810-3822页

作者： Zhao Wang Hao Yuan Jian Tao Shu-Lin Liu Ying Hong Zhi-Yi Hu Jian Zhang Bao-Lian Su The State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan Hubei 430070 P. R. China State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University Xi’an Shaanxi 710000 P. R. China The State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan Hubei 430070 P. R. China；Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles Namur B-5000 Belgium

Semihydrogenation plays a key role in industrial hydrorefining of light alkenes, with a market above 400 billion by 2027. The high cost of commercial palladium-based catalysts strongly calls for innovation but with great challenges. Herein, copper nanoparticles decorated with a minimized ppm of Pd are developed through a chemical plating process to integrate the catalytic advantages of copper and palladium for achieving maximized catalysis in the semihydrogenation of a fatal impurity of butadiene in alkene feedstocks. The developed Pd–Cu catalyst (i.e., 114 ppm of Pd in Pd0.0033Cu1/TiO2) exhibits an unprecedented catalytic performance superior to commercial Pd/Al2O3, with 100% butene selectivity above 90% of butadiene conversion over 130 h on stream at 90 °C. Further exploration reveals that the atomically dispersed Pd on Cu nanoparticles, obtained at ultralow ppm levels of Pd loading, induces a hidden but critical H2trap, which concentrates H2on the Pd site for further H2dissociation that offers intermediate hydrogen atoms to the tandem butadiene semihydrogenation over the third layer of Cu atoms neighboring Pd through hydrogen spillover. Moreover, a threshold on Pd density was identified at Pd/Cu surficial atomic ratio of 1/138 (i.e., Pd0.0033Cu1/TiO2) for maximizing butadiene semihydrogenation performance, based on an extreme collaboration between Pd for H2dissociation and Cu for butadiene hydrogenation. This work provides important guidance for developing noble metal-saving catalysts in industrial applications.

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Influences of particle size and composition on the hydrolysis behavior of MgO·nAl2O3 spinel

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Ceramics International 2025年

作者： Cao, Mengying Tu, Guangsheng Huang, Qing Liao, Jiaxing Jing, Zhengyang Chen, Bowen Tu, Bingtian Wang, Hao Wang, Weimin Fu, Zhengyi State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China Hubei Longzhong Laboratory Hubei Xiangyang441000 China

The hydrolysis characteristic of MgO·nAl2O3 powders poses significant challenges for fabricating large-sized and complex-shaped transparent ceramic components. In this work, the hydrolysis behavior of MgO·nAl2O3 powders with designed particle size and chemical composition was systematically investigated. The results ascertained that coarse MgAl2O4 powders synthesized at higher temperatures exhibited reduced surface-active sites, and alumina-rich spinel surfaces exposed decreased unsaturated Mg atoms that catalyze water dissociation. The OH− concentrations in MgAl2O4-coarse and MgO·1.8Al2O3 suspensions were 63 % and 32 % of that in MgAl2O4-fine one, respectively, indicating an effective inhibition of the hydrolysis reaction. Ultimately, the hydrolysis mechanism of MgO·nAl2O3 was elucidated, where the boehmite protective layer (∼15 nm) formed on the particle surface after hydrolysis. This study provides a fundamental understanding of the surface properties and hydrolysis behavior of MgO·nAl2O3, which is of great significance for the preparation of spinel transparent ceramics using aqueous gel-casting. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Surface reactions

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Light tuning CO/H_(2)composition on Ag:Unraveling CO_(2)mass transfer and electron-phonon coupling in plasmon-enhanced electrocatalysis

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Nano Research 2025年第1期18卷 173-185页

作者： Rui Lin Dong Fan Luca MBerger Thomas Possmayer Yu Zhou Jiexin Zhu Xingbao Chen Wen Luo Lars Allmendinger Andreas Tittl Leonardo de Souza Menezes Guillaume Maurin Shihe Yang and Stefan AMaier Nanoinstitute Munich Faculty of PhysicsLudwig-Maximilians-Universität München80539 MunichGermany Institut Charles Gerhardt Montpellier UMR 5253 CNRS ENSCM UniversitéMontpellierPlace E.Bataillon34090 MontpellierFrance Guangdong Provincial Key Lab of Nano-Micro Material Research School of Advanced MaterialsPeking University Shenzhen Graduate SchoolShenzhen 518055China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Faculty of Chemistry and Pharmacy Ludwig-Maximilians-Universität München81377 MunichGermany Departamento de Física Universidade Federal de Pernambuco50670-901 Recife-PEBrazil School of Physics and Astronomy Monash University Clayton CampusMelbourneVictoria 3800Australia Department of Physics Imperial College LondonSW72AZ LondonUK

Plasmon-enhanced electrocatalysis(PEEC)is an emerging approach to mitigate CO_(2)*** mechanisms behind CO_(2)adsorption and reduction at the catalyst-electrolyte interface in PEEC still need to be further ***,we employ a well-defined Ag nanostructure to elucidate these pivotal *** shining light with wavelengths of 625,525,405 nm on Ag,an adjustable CO/H_(2)ratio from 35 to 1 can be *** reaction pathway changing under plasmonic excitation does not originate from the lowered CO_(2)mass transfer in the vicinity of Ag,as the electrochemical quartz crystal microbalance results unravel that a slightly elevated temperature in bulk electrolyte caused by light irradiation cannot weaken the CO_(2)adsorption at the Ag catalyst-electrolyte *** calculations reveal that optical excitation towards shorter wavelengths leads to a progressive lowered energy barrier for H_(2)formation together with an enhanced energy barrier for^(*)COOH *** thermodynamically suppressed,CO_(2)reduction can still be improved kinetically by optimizing the excitation wavelength and intensity,being accompanied with the enhanced *** absorption spectroscopy results further correlate the higher photocurrent with a prolonged electron-phonon coupling time,verifying that the improvement of CO_(2)reduction kinetics in PEEC can be realized by hot electron harnessing.

关键词： plasmonic catalysis photoelectrochemical CO_(2)reduction CO/H_(2)ratio hot electron generation electronphonon coupling thermal effect

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Unveiling the top-down crystallization mechanism: Balancing diffusion and crystallization in vapor–solid reactions for efficient perovskite solar cells

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Journal of Energy Chemistry 2025年 108卷 263-271页

作者： Duan, Changyu Hu, Shenghan Dou, Yichen Deng, Xinyu Jiang, Xiongzhuang Peng, Yong Liang, Guijie Cheng, Yi-Bing Ku, Zhiliang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China Hubei Key Laboratory of Low Dimensional Optoelectronic Material and Devices Hubei University of Arts and Science Hubei Xiangyang441053 China Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Guangdong Foshan528200 China

Vapor deposition is a promising technique for industrializing perovskite solar cells, but limited understanding of crystallization mechanisms in vapor-phase processes hampers progress. This study reveals a top-down crystallization growth mechanism during a two-step vapor–solid reaction and introduces an accelerated diffusion-buried homogeneous seed (AD-BHS) strategy. By utilizing the rapid diffusion of methylammonium chloride and inducing crystallization with buried seeds, we eliminate residual lead iodide, reduce crystallization time disparities across the film, and enhance uniformity. As a result, we achieve efficiencies of 22.40% for small-area (0.148 cm2) cells and 19.75% for large-area (10.0 cm2) modules, both representing state-of-the-art performance for vapor–solid reaction-based perovskite solar cells. This study provides critical insights into regulating crystallization growth in vapor-deposited perovskite thin films. © 2025 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences

关键词： Plasma CVD

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Scalable polydopamine@ZrO2/PVDF composite ink for corrosion protection of magnesium alloy

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Colloids and Surfaces A: Physicochemical and Engineering Aspects 2025年 721卷

作者： Li, Zhenyang Yang, Kai Zhang, Pengxiang Wang, Yunfan Peng, Jian Li, Bao-Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices and Center of Biomedical Material and Engineering Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

Two-dimensional (2D) materials have exhibited significant potential in the field of metal anticorrosion coatings. However, nanosheets with high electrical conductivity may promote "corrosion-enhancing activity," thereby compromising the protective efficacy of the coating. In contrast, metal oxide nanosheets derived from layered compounds present a promising alternative due to their favorable properties. In this study, a composite ink for AZ31 magnesium alloy anticorrosion with blade coating method is fabricated by polydopamine (PDA)-coated ZrO2 nanosheets/polyvinylidene fluoride (PVDF). The surface composition and microstructure of the resulting coating are systematically characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The anticorrosion properties of the composite coating are evaluated through potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The electrochemical results demonstrate that the ZrO2@PDA/PVDF coating achieves a corrosion protection efficiency of 99.93 %, with a corrosion current density of 9.48 × 10−8 A·cm−2, which is three orders of magnitude lower than that of bare AZ31. This study provides a new insight into the scalable application of metal oxide nanosheets in metal anticorrosion coatings. © 2025 Elsevier B.V.

关键词： Fourier transform infrared spectroscopy

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Ablation behavior and mechanism of MoSi2/mica/HSM modified CF/BPR composites during prolonged ablation of oxyacetylene flame

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Ceramics International 2025年

作者： Zhang, Shiquan Zhang, Jian Hu, Sheng Zhang, Ruizhi Li, Junguo Shen, Qiang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Xiangyang441000 China School of Chemical and Environment Engineering Hubei Minzu University Enshi445000 China

Ablative thermal protection materials are widely used in entry and re-entry vehicles which benefit from their strong adaptability. However, long-term ablation has been a limitation due to the consumption of the matrix of the ablative materials. In this work, the microstructure evolution and ablation properties of the MoSi2/mica-modified CF/BPR composites with and without hollow silicate glass microspheres (HSMs) under protracted ablation have been investigated. The mass ablation rates decreased while the linear ablation rates increased when the ablation times were prolonged. The composites with 30 vol.% HSMs have good insulation properties, shown by a lower backside temperature of 240.9 °C after 100 s of ablation. The decrease in thermal conductivity limited heat transfer in both the axial and horizontal directions. This led to heat concentration and severe ablation at the central surface. The three-dimensional porous and the ladder structure formed in the transfer region, and the features gradually disappeared while extending the ablation times because of the flame erosion and formed liquid phases. The heat diffusion and concentration within the matrix established a gradient temperature field, which determined the ablation behavior and mechanism, providing valuable insights for the development of advanced ablative thermal protection materials. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Silicates

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Effects of depth of discharge on the electrochemical performance of LiFePO4-graphite pouch cells

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Solid state Ionics 2025年 427卷

作者： Qiao, Xin Mu, Yahao Peng, Jian Pei, Bo Wang, Shuo Wuhan Institute of Marine Electric Propulsion Wuhan430064 China Center of Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China

Lithium iron phosphate-graphite (LFP-C) batteries are widely used in energy storage and electric vehicles due to their high safety and good cycling stability. However, there is still a lack of in-depth research to investigate the impact of depth of discharge (DOD) on LFP-C pouch cells. In this work, we systematically investigate the influence of DOD (2.5 V and 1.5 V) on the cycling performance of LFP-C pouch cells, and the evolution of the cathode–electrolyte interphase (CEI) and solid electrolyte interphase (SEI) layers. In comparison to a DOD of 2.5 V, the cell with a DOD of 1.5 V exhibits a rapid capacity degradation after 50 cycles. Combined with comprehensive characterizations, the mechanism of battery decay has been revealed. A deeper discharge to 1.5 V results in an increase in the disorder of graphite. Additionally, the organic components in the SEI layer decreases, while the Li2CO3, LiF, and Li3PO4 inorganic products enrich due to the continued decomposition of electrolyte. Meanwhile, the pouch cells generate a considerable quantity of H2 and minor CH4 gases. This study will pave the way to understand the effects of overdischarge on the electrochemical performance of commercial pouch cells and the evolution mechanism of CEI/SEI layers. © 2025 Elsevier B.V.

关键词： Battery Pack

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Understanding the effect of rare-earth doping in ABO3 ferroelectrics on capacitive energy storage

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Journal of the European Ceramic Society 2025年第14期45卷

作者： Duan, Yu-Lin Wang, Jian Shen, Zhong-Hui Zhou, Meng-Jun Jiang, Jian-Yong Liu, Han-Xing Nan, Ce-Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices Wuhan University of Technology Wuhan430070 China School of Materials and Microelectronics Wuhan University of Technology Wuhan430070 China Wuzhen Laboratory Tongxiang314500 China School of Materials Science and Engineering State Key Lab of New Ceramics and Fine Processing Tsinghua University Beijing100084 China

Rare-earth doping, even in trace amounts, can significantly regulate the energy storage performance of ferroelectric materials by synergistically adjusting microscopic behaviors such as crystal structure and energy bands. However, understanding the mechanisms by which different rare-earth elements influence the energy storage performance such as polarization and breakdown remains a major challenge. To address this, we use density functional theory to systematically investigate the effect of rare-earth doping on the microscopic ferroelectric behavior in three ABO3 perovskite ferroelectrics by substituting A-site or B-site ions with 15 types of rare-earth ions. The results show that when introducing rare-earth ions, lattice structure and electronic state distribution can be rebuilt due to strong volume effect and hybridization, thereby altering the ion displacement polarization, reversal energy barrier, and energy gap. Notably, their effects highly depend on the occupancy of rare-earth ions on the A-site or B-site. For A-site doping, a decrease in the ionic radius of rare-earth ions generally leads to increases in the c/a ratio, polarization strength, reversal energy barrier, and energy gap, whereas B-site doping shows the opposite trends. This work reveals the underlying mechanisms of rare-earth doping on affecting the energy storage performance and provides important theoretical guidance for engineering rare-earth doping in perovskite ferroelectrics. © 2025 Elsevier Ltd

关键词： Crystal lattices

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