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Multi-layer multi-pass friction rolling additive manufacturing of Al alloy:Toward complex large-scale high-performance components

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 425-438页

作者： Haibin Liu Run Hou chenghao Wu Ruishan xie Shujun chen college of Mechanical&Energy Engineering Beijing University of TechnologyBeijing 100124China chongqing Research Institute of Beijing University of Technology Chongqing 401121China

At present,the emerging solid-phase friction-based additive manufacturing technology,including friction rolling additive man-ufacturing(fRAM),can only manufacture simple single-pass *** this study,multi-layer multi-pass fRAM-deposited alumin-um alloy samples were successfully prepared using a non-shoulder tool *** material flow behavior and microstructure of the over-lapped zone between adjacent layers and passes during multi-layer multi-pass fRAM deposition were studied using the hybrid 6061 and 5052 aluminum *** results showed that a mechanical interlocking structure was formed between the adjacent layers and the adja-cent passes in the overlapped center *** friction and rolling of the tool head led to different degrees of lateral flow and plastic deformation of the materials in the overlapped zone,which made the recrystallization degree in the left and right edge zones of the over-lapped zone the highest,followed by the overlapped center zone and the non-overlapped *** tensile strength of the overlapped zone exceeded 90%of that of the single-pass deposition *** is proved that although there are uneven grooves on the surface of the over-lapping area during multi-layer and multi-pass deposition,they can be filled by the flow of materials during the deposition of the next lay-er,thus ensuring the dense microstructure and excellent mechanical properties of the overlapping *** multi-layer multi-pass fRAM deposition overcomes the limitation of deposition width and lays the foundation for the future deposition of large-scale high-performance components.

关键词： aluminum alloy additive manufacturing solid-state friction stir welding multi-layer multi-pass

Engineering nanoparticle structure at synergistic Ru-Na interface for integrated cO2 capture and hydrogenation

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Journal of Energy chemistry 2025年第1期100卷 779-791页

作者： Hanzi Liu Ling cen Xinlin xie Lei Liu Zhao Sun Zhiqiang Sun Hunan Engineering Research center of clean and Low-carbon Energy Technology School of Energy Science and Engineering Central South University

The development of dual functional material for cyclic cO2capture and hydrogenation is of great significance for converting diluted cO2into valuable fuels,but suffers from kinetic limitation and deactivation of adsorbent and ***,we engineered a series of RuNa/γ-Al2O3materials,varying the size of ruthenium from single atoms to clusters/*** coordination environment and structure sensitivity of ruthenium were quantitatively investigated at atomic *** findings reveal that the reduced Ru nanoparticles,approximately 7.1 nm in diameter with a Ru-Ru coordination number of 5.9,exhibit high methane formation activity and selectivity at 340°*** Ru-Na interfacial sites facilitate cO2migration through a deoxygenation pathway,involving carbonate dissociation,carbonyl formation,and ***-situ experiments and theoretical calculations show that stable carbonyl intermediates on metallic Ru nanoparticles facilitate heterolytic c–O scission and c–H bonding,significantly lowering the energy barrier for activating stored cO2.

关键词： carbon capture and utilization

Unraveling the significance of cobalt on transformation kinetics,crystallography and impact toughness in high-strength steels

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 380-390页

作者： Yishuang Yu Jingxiao Zhao Xuelin Wang Hui Guo Zhenjia xie chengjia Shang collaborative Innovation center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This work reveals the significant effects of cobalt(co)on the microstructure and impact toughness of as-quenched highstrength steels by experimental characterizations and thermo-kinetic *** results show that the co-bearing steel exhibits finer blocks and a lower ductile-brittle transition temperature than the steel without ***,the co-bearing steel reveals higher transformation rates at the intermediate stage with bainite volume fraction ranging from around 0.1 to *** improved impact toughness of the co-bearing steel results from the higher dense block boundaries dominated by the V1/V2 variant ***,the addition of co induces a larger transformation driving force and a lower bainite start temperature(BS),thereby contributing to the refinement of blocks and the increase of the V1/V2 variant *** findings would be instructive for the composition,microstructure design,and property optimization of high-strength steels.

关键词： high-strength steel cobalt transformation kinetics crystallography impact toughness

Stepwise assembly to construct stable copper(I) cluster-based circularly polarized luminescent MOfs

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Science china chemistry 2025年

作者： Jing-Wen xie Meng-Ting Wang Yan Jin Si Li Jian-Hua Qin Shuang-Quan Zang Tomas c.W.Mak college of chemistry Henan Key Laboratory of Crystalline Molecular Functional Materials Zhengzhou University college of chemistry and chemical Engineering Luoyang Normal University Department of chemistry The Chinese University of Hong Kong

circularly polarized luminescence （cPL） materials have been extensively studied in recent years owing to their widespread applications in 3D display,optical storage,optical anti-counterfeiting,and biological imaging,***（I） clusters have emerged as a promising candidate for cPL materials,driven by their cost-effectiveness,superior luminescent properties,precise structure,and low ***,the poor environmental stability of copper（I） clusters renders their synthesis and preservation challenging,thereby significantly impeding their ***,we have designed and synthesised a chiral double-coordinated ligand in order to construct copper（I） cluster nodes that can be further *** anticipated,by utilizing stepwise assembly strategy,a cu4cluster node co-modified by chiral alkynyl ligands and triphenylphosphine was further assembled with cd2+ions to obtain 2D layers structure,L/*** L/D-cu4-cd exhibits excellent stability and optical properties,including bright yellow emission,solvent-responsive luminescence,and cPL activity with a maximum glumup to 2.0×10-3,which shows potential applications in the WLED and *** interestingly,the material also exhibits deflection ability towards different wavelengths of linearly polarized light,showing certain potential in the preparation of circular polarizer.

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Trinuclear gold-catalyzed site-selective alkylation of peptides

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Science china chemistry 2025年第1期68卷 249-256页

作者： Qing-Yun fang chengyihan Gu Yinghan chen Wencheng Yan Yong Liang Weipeng Li chengjian Zhu Jie Han Jin xie State Key Laboratory of coordination chemistry Jiangsu Key Laboratory of Advanced Organic Materials Chemistry and Biomedicine Innovation Center (Chem BIC) School of Chemistry and Chemical Engineering Nanjing University Green catalysis center College of Chemistry Zhengzhou University State Key Laboratory of Natural Medicines China Pharmaceutical University

Selective modification of peptides has always been a challenging issue. The selective alkylation of peptides can alter the biological activity and physical properties of molecules, and it has gained significant research interest. We herein disclose an intriguing gold-catalyzed alkylation of peptides using bench-stable unactivated alkyl bromides under photoredox catalysis. A wide range of structurally diverse primary, secondary and tertiary alkyl bromides serve as effective coupling partners to precisely connect with the α-c(sp3)–H in glycine residue of peptides. This protocol demonstrates an exceptionally broad scope for alkyl halides and excellent tolerance for a wide range of useful functional groups. A series of relay transformations to construct cyclic peptides, to proceed click reaction and to realize peptide fluorescence labeling further enhance its synthetic practicality. In addition, mechanistic studies and density functional theory(DfT) calculations reveal an inner-sphere and subsequent outersphere single electron transfer(SET) mechanism.

关键词： gold catalysis peptide alkylation c-c coupling radical

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Thickness and sp3 bond modulation of（Ti/tetrahedral amorphous carbon）_n multilayer coatings

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Tungsten 2025年第1期7卷 152-160页

作者： Zhi-Jun xie Jia-Lin Li Ling Gong Xiang-Li Zhong Hong-Jia Song Jin-Bin Wang National-Provincial Laboratory of Special function Thin film Materials School of Materials Science and Engineering Xiangtan University

The durability of wear-resistant tetrahedral amorphous carbon（ta-c） coatings is intimately linked to their thickness and the concentration of *** enhance the lifespan of the coatings,we have prepared a multilayer coating consisting of alternating layers of Ti and ta-c,denoted as（Ti/ta-c）_n,using arc ion plating.A multi-layer structure in conjunction with stage cooling is employed to enhance the thickness and promote *** results indicate that the ID/IGvalue,representing the ratio of the intensity of the D peak to that of the G peak in Raman spectroscopy,decreases from 0.85 when no stage cooling is applied to 0.35 when stage cooling is employed,suggesting an enhancement in the fraction of sp3bonds within the *** obtained（Ti/ta-c）_n multilayer coating without peeling off has a maximum thickness of 1.14 μm,which is almost double that of the ta-c coating single layer *** the same time,the coating has a low coefficient of friction,down to 0.069,and maintains excellent friction properties with a wear rate of 3.4×10-6mm3·N-1·*** results conclusively show that the preparation technology can enhance both thickness and sp3bonding in ta-c coatings,significantly expanding their utility across tools,molds,and precision engineering components.

关键词： Arc ion plating Multilayer structure sp3 bond Ta-c coating Wear resistance

3D Printing of Tough Hydrogel Scaffolds with functional Surface Structures for Tissue Regeneration

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Nano-Micro Letters 2025年第2期17卷 18-45页

作者： Ke Yao Gaoying Hong Ximin Yuan Weicheng Kong Pengcheng Xia Yuanrong Li Yuewei chen Nian Liu Jing He Jue Shi Zihe Hu Yanyan Zhou Zhijian xie Yong He State Key Laboratory of fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China Liangzhu Laboratory Zhejiang UniversityHangzhou 310027People’s Republic of China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province College of Mechanical EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China Stomatology Hospital School of StomatologyZhejiang University School of MedicineHangzhou 310027People’s Republic of China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001People’s Republic of China Institute of Digital Medicine Nanjing First HospitalNanjing Medical UniversityNanjing 210006People’s Republic of China

Hydrogel scaffolds have numerous potential applications in the tissue engineering ***,tough hydrogel scaffolds implanted in vivo are seldom reported because it is difficult to balance biocompatibility and high mechanical *** by chinese ramen,we propose a universal fabricating method(printing-P,training-T,cross-linking-c,PTc&PcT)for tough hydrogel scaffolds to fill this ***,3D printing fabricates a hydrogel scaffold with desired structures(P).Then,the scaffold could have extraordinarily high mechanical properties and functional surface structure by cycle mechanical training with salting-out assistance(T).finally,the training results are fixed by photo-cross-linking processing(c).The tough gelatin hydrogel scaffolds exhibit excellent tensile strength of 6.66 MPa(622-fold untreated)and have excellent ***,this scaffold possesses functional surface structures from nanometer to micron to millimeter,which can efficiently induce directional cell ***,this strategy can produce bionic human tissue with mechanical properties of 10 kPa-10 MPa by changing the type of salt,and many hydrogels,such as gelatin and silk,could be improved with PTc or PcT *** experiments show that this scaffold can effectively promote the new generation of muscle fibers,blood vessels,and nerves within 4 weeks,prompting the rapid regeneration of large-volume muscle loss injuries.

关键词： 3D printing Tough hydrogel scaffold functional surface structure Tissue regeneration Biomaterials

Skeletal muscle-specific Bambi deletion induces hypertrophy and oxidative switching coupling with adipocyte thermogenesis against metabolic disorders

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Science china Life Sciences 2025年

作者： Xiangping Yao Xudong Mai Ye Tian Yifan Liu Guanghui Jin Ze Li Shujie chen Xiaoshuang Dai Liujing Huang Zijing fan Guihua Pan Xiaohan Pan Xiangmin Li Michael c Yu Jia Sun Jingxing Ou Hong chen Liwei xie college of Life and Health Sciences Guangdong Industry Polytechnic Department of Endocrinology and Metabolism Zhujiang Hospital Southern Medical University State Key Laboratory of Applied Microbiology Southern china Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application Guangdong Open Laboratory of Applied MicrobiologyInstitute of Microbiology Guangdong Academy of Sciences Institute of Aging Research Guangdong Provincial Key Laboratory of Medical Molecular Diagnostics School of Medical Technology Guangdong Medical University Department of Hepatic Surgery and Liver transplantation center of the Third Affiliated Hospital Organ Transplantation Institute Sun Yat-sen University Organ Transplantation Research Center of Guangdong ProvinceGuangdong province engineering laboratory for transplantation medicine Guangdong Provincial Key Laboratory of Liver Disease Research School of Public Health Xinxiang Medical University BGI Institute of Applied Agriculture BGI-Shenzhen Department of Applied Biology and chemical Technology The Hong Kong Polytechnic University Department of Biological Sciences State University of New York at Buffalo Department of Internal Medicine Shunde Women and Children's Hospital (Maternity and Child Healthcare Hospital of Shunde Foshan) Guangdong Medical University

Skeletal muscle plays a significant role in both local and systemic energy metabolism. The current investigation aims to explore the role of the Bambi gene in skeletal muscle, focusing on its implications for muscle hypertrophy and systemic metabolism. We hypothesize that skeletal muscle-specific deletion of Bambi induces muscle hypertrophy, improves metabolic performance, and activates thermogenic adipocytes via the reprogramming of progenitor of i WAT, offering potential therapeutic strategies for metabolic syndromes. Leveraging the chromatin immunoprecipitation(chIP)-seq and bioinformatics analysis, Bambi gene is shown to be a direct target of HIf2α, which is further confirmed by chIP-qPcR and promoter luciferase assay. Skeletal muscle-specific Bambi deletion led to significant muscle hypertrophy and improved metabolic parameters, even under high-fat diet conditions. This deletion induced metabolic reprogramming of stromal vascular fractions(SVfs) into thermogenic adipocytes, contributing to systemic metabolic improvements, potentially through the secretory ***, mice with skeletal muscle-specific Bambi deletion demonstrate resistance to high-fat diet-induced metabolic disorders, highlighting a potential therapeutic pathway for metabolic syndrome management. Thus, skeletal muscle-specific deletion of Bambi triggers muscle growth, enhances metabolic performance, and activates thermogenic adipocytes. These findings suggest Bambi as a novel therapeutic target for metabolic syndromes, providing new insights into the interaction between muscle hypertrophy and systemic metabolic improvement. The study underscores the potential of manipulating muscle physiology to regulate whole-body metabolism, offering a novel perspective on treating metabolic disorders.

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Making sense of spike D614G in SARS-coV-2 transmission

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Science china(Life Sciences) 2021年第7期64卷 1062-1067页

作者： Aria c.Shi Xuping xie School of Medicine Johns Hopkins UniversityBaltimoreMD 21205USA Department of Biochemistry and Molecular Biology University of Texas Medical BranchGalvestonTX 77550USA

Severe acute respiratory syndrome coronavirus 2(SARS-coV-2),the etiologic agent of the current coronavirus disease 2019(cOVID-19)pandemic,has evolved to adapt to human host and transmission over the past 12 *** prominent adaptive mutation is the asparagine-to-glycine substitution at amino acid position 614 in the viral spike protein(D614G),which has become dominant in the currently circulating virus *** spike protein determines host ranges,tissue tropism,and pathogenesis through binding to the cellular receptor of angiotensin converting enzyme 2(AcE2),the D614G mutation is hypothesized to enhance viral fitness in human host,leading to increased transmission during the global *** we summarize the recent progress on the role of the D614G mutation in viral replication,pathogenesis,transmission,and vaccine and therapeutic antibody *** findings underscore the importance in closely monitoring viral evolution and defining their functions to ensure countermeasure efficacy against newly emerging variants.

关键词： SARS-coV-2 D614G cOVID-19