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Journal of materials Science & Technology 2024年第6期173卷 72-79页

作者： L.J.Huang H.Wang L.Z.Ouyang M.Zhu H.J.Lin School of materials Science and Engineering Key Laboratory of Advanced Energy Storage Materials of Guangdong ProvinceSouth China University of TechnologyGuangzhou 510641China institute of Advanced wear&Corrosion resistance and Functional materials Jinan UniversityGuangzhou 510632China

Mg-based amorphous alloys are one of the potential hydrogen storage materials but suffer from sluggish dehydrogenation/hydrogenation(de/hydrogenation)*** this work,as a new strategy,a hydrogen pump is built on the surface of amorphous alloys to solve this *** milling crystalline YFe_(2-x)Al_(x) hydrogen storage alloy with Mg_(60)La_(10)Ni_(20)Cu_(10) amorphous alloy,fine crystalline particles were seeded on amorphous alloy powder to form a“strawberry”*** to the TEM observation,a metallurgical bonding boundary formed between the Mg-based amorphous matrix and the Y-Fe-Al crystalline *** microstructure and de/hydrogenation kinetics investigation,the“hydrogen pump”effect of the seeded crystalline alloy was confirmed,which makes it much easier for the hydrogen to dissociate on and diffuse through the surface of the Mg-based amorphous *** such effect,the H absorption rate of Mg_(60)La_(10)Ni_(20)Cu_(10) amorphous alloy became almost eight times faster and it absorbs ~2.8 wt.% in 1 h at 130℃ under 4.5 MPa-H_(2).Further,fast hydrogenation can even achieve at 70℃ and the low-temperature dehydrogenation kinetics of the amorphous hydride can be also greatly *** present work proves that surface modification is of great importance for obtaining Mg-based amorphous alloy with ideal hydrogen storage performance.

关键词： Hydrogen storage Mg-based amorphous alloy Hydrogen pump Composite structure

Effect of Heat Treatment on Microstructure and Mechanical Behavior of Cu-Bearing 316L Stainless Steel Produced by Selective Laser Melting

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 169-180页

作者： Huan Yang Ying Liu Jianbo Jin Kunmao Li Junjie Yang Lingjian Meng Chunbo Li Wencai Zhang Shengfeng Zhou Sino-German College of Intelligent Manufacturing Shenzhen Technology UniversityShenzhen518118China institute of Advanced wear and Corrosion resistance and Functional materials Jinan UniversityGuangzhou510632China Department of Orthopedics First Affiliated Hospital of Jinan UniversityGuangzhou510632China

Cu-bearing stainless steels(SSs)with high strength,excellent plasticity,and effective antimicrobial properties hold significant potential for applications in the marine *** this study,Cu-bearing SSs with copper ranging from 0 to 6.0 wt%were successfully prepared using selective laser melting(SLM)*** the Cu-bearing SSs with different copper contents,the effect of heat treatment on the microstructural and mechanical behaviors was studied *** observations revealed that the subgrain size of Cu-bearing SSs increased with heat treatment at 500℃ and 700℃ for 6 ***,the tensile strength and elongation increased after the heat treatment temperature due to the combined effect of dislocations,twins,andε-Cu precipitated ***,after heat treatment at 700℃,the SLM4.5Cu sample exhibited an abnormal rise in tensile strength and *** finding suggests that the diffusion strengthening caused byε-Cu precipitates exceeded the stacking fault ***,the tensile strength and elongation reached 693.32 MPa and 56.94%,*** work provides an efficient approach for preparing Cu-bearing SSs with exceptional strength and plasticity.

关键词： Selective laser melting Cu-bearing stainless steel(SS) Heat treatment Mechanical properties

变形和能量注入协同作用制备可控非晶纳米晶结构超高饱和磁化强度FeCoB粉末

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Science China materials 2024年第6期67卷 1985-1993页

作者：李枧邵里良白荣晟周靖童星林怀俊张猛柯海波汪卫华 institute of Advanced wear&Corrosion resistance and Functional materials Jinan UniversityGuangzhou 510632China Songshan Lake materials Laboratory Dongguan 523808China institute of Physics Chinese Academy of SciencesBeijing 100190China

非晶纳米晶磁粉芯(ANMPCs)是电子元器件在高频应用的关键软磁材料.但其相对较低的饱和磁化强度无法满足器件的小型化要求.强Fe-Co交换耦合非晶纳米晶粉是制备高磁化强度ANMPCs的潜在材料.本文采用机械球磨法制备了一系列(Fe_(0.8)Co_(0.... 详细信息

非晶纳米晶磁粉芯(ANMPCs)是电子元器件在高频应用的关键软磁材料.但其相对较低的饱和磁化强度无法满足器件的小型化要求.强Fe-Co交换耦合非晶纳米晶粉是制备高磁化强度ANMPCs的潜在材料.本文采用机械球磨法制备了一系列(Fe_(0.8)Co_(0.2))_(87)B_(13)软磁粉末,这些粉末的非晶相、纳米晶相含量和粒径可调.在球磨过程中,出现了合金化、玻璃化和纳米化三个阶段以及粉末形貌和尺寸的非线性变化,进而导致ANMPCs软磁性能的非单调变化.磁粉具有超高饱和磁化强度达239 emu g^(-1),有效磁导率为33.球磨150 h后,FeCoB粉末非晶-纳米晶双相结构达到动态平衡,同时粒径达亚微米尺度,从而提高了粉末高频稳定性且降低了磁芯损耗.在变形和能量注入的协同作用下,机械球磨实现了含极高铁磁元素的非晶-纳米晶双相粉末可控制备、提高了高磁化强度ANMPCs综合软磁性能.

关键词： amorphous-nanocrystalline magnetic powder core mechanical ball milling ultrahigh ferromagnetic element sa-turation magnetization high-frequency properties

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On-Chip Micro Temperature Controllers Based on Freestanding Thermoelectric Nano Films for Low-Power Electronics

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Nano-Micro Letters 2024年第7期16卷 98-108页

作者： Qun Jin Tianxiao Guo Nicolas Perez Nianjun Yang Xin Jiang Kornelius Nielsch Heiko Reith institute for Metallic materials Leibniz Institute for Solid State and Materials Research01069 DresdenGermany institute of materials Engineering University of Siegen57076 SiegenGermany institute of Applied Physics Technical University of Dresden01069 DresdenGermany institute of materials Science Technical University of Dresden01069 DresdenGermany

Multidimensional integration and multifunctional com-ponent assembly have been greatly explored in recent years to extend Moore’s Law of modern ***,this inevitably exac-erbates the inhomogeneity of temperature distribution in microsystems,making precise temperature control for electronic components extremely ***,we report an on-chip micro temperature controller including a pair of thermoelectric legs with a total area of 50×50μm^(2),which are fabricated from dense and flat freestanding Bi2Te3-based ther-moelectric nano films deposited on a newly developed nano graphene oxide membrane *** tunable equivalent thermal resistance is controlled by electrical currents to achieve energy-efficient temperature control for low-power electronics.A large cooling temperature difference of 44.5 K at 380 K is achieved with a power consumption of only 445μW,resulting in an ultrahigh temperature control capability over 100 K mW^(-1).Moreover,an ultra-fast cooling rate exceeding 2000 K s^(-1) and excellent reliability of up to 1 million cycles are *** proposed on-chip temperature controller is expected to enable further miniaturization and multifunctional integration on a single chip for microelectronics.

关键词： Temperature control Low-power electronics On-chip micro temperature controller Freestanding thermoelectric nano films Temperature-sensitive components

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Molecular design of recyclable thermosetting polyimide and its composite with excellent mechanical and tribological properties

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Friction 2024年第3期12卷 452-461页

作者： Xiaoyue WANG Zenghui YANG Tingmei WANG Qihua WANG Xinrui ZHANG Song LI Key Laboratory of Science and Technology on wear and Protection of materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Recyclability of thermosetting polymers and their composites is a challenge for alleviating environmental pollution and resource *** this study,solvent-recyclable thermosetting polyimide(PI)and its composite were successfully *** tensile strength,elongation at break,and Young’s modulus of PI are 108.70±7.29 MPa,19.35%±3.89%,and 2336.42±128.00 MPa,*** addition of reduced graphene oxide(RGO)not only enhances the mechanical properties of PI but also endows it with excellent tribological *** PI illustrates a high recycling efficiency of 94.15%,but the recycled composite exhibits inferior mechanical *** recycling and utilization of PI and its composite are realized through imine bonds(-C=N),which provides new guidance for solving the problem of environmental pollution and resource waste and is potential application in the field of sustainable tribology.

关键词： thermosetting polyimide(PI) recyclability dynamic covalent bonds friction and wear polymer composites

Spontaneous grain refinement effect of rare earth zinc alloy anodes enables stable zinc batteries

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National Science Review 2024年第7期11卷 252-262页

作者： Manjing Chen Yuxiang Gong Yunxiang Zhao Yexin Song Yan Tang Zhiyuan Zeng Shuquan Liang Peng Zhou Bingan Lu Xiaotan Zhang Jiang Zhou School of materials Science&Engineering Hunan Provincial Key Laboratory of Electronic Packaging and Advanced Functional MaterialsCentral South University institute of materials Research Tsinghua Shenzhen International Graduate School Tsinghua University Department of materials Science and Engineering City University of Hong Kong Hunan Provincial Key Defense Laboratory of High Temperature wear-Resisting materials and Preparation Technology Hunan University of Science and Technology School of Physics and Electronics Hunan University School of Chemistry and materials Science University of Science and Technology of China Suzhou institute for Advanced Research University of Science and Technology of China

Irreversible interfacial reactions at the anodes pose a significant challenge to the long-term stability and lifespan of zinc（Zn） metal batteries, impeding their practical application as energy storage devices. The plating and stripping behavior of Zn ions on polycrystalline surfaces is inherently influenced by the microscopic structure of Zn anodes, a comprehensive understanding of which is crucial but often overlooked. Herein, commercial Zn foils were remodeled through the incorporation of cerium（Ce）elements via the ‘pinning effect’ during the electrodeposition process. By leveraging the electron-donating effect of Ce atoms segregated at grain boundaries（GBs）, the electronic configuration of Zn is restructured to increase active sites for Zn nucleation. This facilitates continuous nucleation throughout the growth stage,leading to a high-rate instantaneous-progressive composite nucleation model that achieves a spatially uniform distribution of Zn nuclei and induces spontaneous grain refinement. Moreover, the incorporation of Ce elements elevates the site energy of GBs, mitigating detrimental parasitic reactions by enhancing the GB stability. Consequently, the remodeled ZnCe electrode exhibits highly reversible Zn plating/stripping with an accumulated capacity of up to 4.0 Ah cm-2in a Zn symmetric cell over 4000 h without short-circuit behavior. Notably, a ～0.4 Ah Zn||NH4V4O10pouch cell runs over 110 cycles with 83% capacity retention with the high-areal-loading cathode(≈20 mg cm-2). This refining-grains strategy offers new insights into designing dendrite-free metal anodes in rechargeable batteries.

关键词： grain refinement rare earth GB stability zinc metal batteries

Tribological properties of PTFE-based fabric composites at cryogenic temperature

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Friction 2024年第2期12卷 245-257页

作者： Mingkun XU Zidan WANG Lihe GUO Liming TAO Tianbao MA Tingmei WANG Qihua WANG Key Laboratory of Science and Technology on wear and Protection of materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Fabric composites are widely employed in self-lubricating bearing liners as solid lubrication *** the tribological behaviors of fabric composites have been extensively studied,the cryogenic tribological properties and mechanisms have been scarcely reported and are largely unclear to instruct material design for aerospace and other high-tech ***,the tribological properties of polytetrafluoroethylene(PTFE)-based hybrid-fabric composites were investigated at cryogenic and ambient temperatures in the form of pin-on-disk friction under heavy *** results suggest that the friction coefficients of the hybrid-fabric composites obviously increase with a decrease in wear when the temperature drops from 25 to−150°***,thermoplastic polyetherimide(PEI),as an adhesive for fabric composites,has better cryogenic lubrication performance than thermosetting phenol formaldehyde(PF)resin,which can be attributed to the flexible chemical structure of *** excellent lubrication performance of hybrid-fabric composites is attributed to the transfer film formed by PTFE fibers on the surface of fabrics.

关键词： cryogenic temperatures fabric composites friction and wear transfer film

Effects of maternal methyl donor intake during pregnancy on ileum methylation and function in an intrauterine growth restriction pig model

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Journal of Animal Science and Biotechnology 2024年第3期15卷 1173-1189页

作者： Yan Lin Jiangnan Wu Yong Zhuo Bin Feng Zhengfeng Fang Shengyu Xu Jian Li Hua Zhao De Wu Lun Hua Lianqiang Che Key Laboratory of Animal Disease‑resistance Nutrition Animal Nutrition InstituteSichuan Agricultural UniversityChengdu 611130SichuanChina

Background Intrauterine growth retardation(IUGR)affects intestinal growth,morphology,and function,which leads to poor growth performance and high *** present study explored whether maternal dietary methyl donor(MET)supplementation alleviates IUGR and enhances offspring’s growth performance by improving intestinal growth,function,and DNA methylation of the ileum in a porcine IUGR *** Forty multiparous sows were allocated to the control or MET diet groups from mating until *** farrowing,8 pairs of IUGR and normal birth weight piglets from 8 litters were selected for sampling before suckling *** The results showed that maternal MET supplementation tended to decrease the IUGR incidence and increased the average weaning weight of ***,maternal MET supplementation significantly reduced the plasma concentrations of isoleucine,cysteine,urea,and total amino acids in sows and newborn *** also increased lactase and sucrase activity in the jejunum of newborn *** addition resulted in lower ileal methionine synthase activity and increased betaine homocysteine S-methyltransferase activity in the ileum of newborn *** methylation analysis of the ileum showed that MET supplementation increased the methyla-tion level of DNA CpG sites in the ileum of newborn ***-regulated differentially methylated genes were enriched in folic acid binding,insulin receptor signaling pathway,and endothelial cell *** contrast,up-regulated methylated genes were enriched in growth hormone receptor signaling pathway and nitric oxide biosyn-thetic *** Maternal MET supplementation can reduce the incidence of IUGR and increase the weaning litter weight of piglets,which may be associated with better intestinal function and methylation status.

关键词： Ileum Intrauterine growth restriction Methyl donor Methylation Sows

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Next-generation probiotic candidates targeting intestinal health in weaned piglets: Both live and heat-killed Akkermansia muciniphila prevent pathological changes induced by enterotoxigenic Escherichia coli in the gut

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Animal Nutrition 2024年第02期17卷 110-122页

作者： Cong Lan Hua Li Yuqing Shen Yang Liu Aimin Wu Jun He Jingyi Cai Gang Tian Xiangbing Mao Zhiqing Huang Bing Yu Ping Zheng Jie Yu Junqiu Luo Hui Yan Yuheng Luo Key Laboratory for Animal Disease-resistance Nutrition of Ministry of Education of China Key Laboratory for Animal Disease-Resistance Nutrition and Feed of Ministry of Agriculture of ChinaKey Laboratory of Animal Disease-Resistant Nutrition of Sichuan ProvinceEngineering Research Center of Animal Disease-Resistance Nutrition Biotechnology of Ministry of Education of ChinaAnimal Nutrition InstituteSichuan Agricultural University

The use of next-generation probiotics （NGP） in pigs for combating diseases has been subject to limited *** we explored the potential of a well-known NGP candidate Akkermansia muciniphila targeting pig gut *** the first screening experiment,we found that the abundance of *** peaked at 14 d old but decreased at weaning （21 d old;P<0.05）,suggesting the weaning period may be an effective window for *** *** that,48 crossbred weaned pigs at 28 d old were randomly assigned to five groups:control （CON）,high/low live *** （HA/LA）,and high/low heatkilled *** （HIA/LIA）.From 1 to 28 d old,the CON group received gastric infusion of anaerobic sterile saline every other day;the HA and LA groups were gavaged every other day with 1×1010CFU/5 m L and 5×10～8CFU/5 mL live ***,respectively;and the HIA and LIA groups were gavaged every other day with 1×1010CFU/5 mL and 5×10～8CFU/5 mL heat-killed ***,*** d 29,pigs in the CON group were randomly and equally divided into two groups,one of which was named the enterotoxigenic Escherichia coli （ETEC） group,and all groups except CON received a 5-d ETEC *** supplementation of *** numerically reduced the diarrhea rate of weaned pigs compared to the pigs that only received the ETEC challenge （P=0.57）,but the LIA group had a higher diarrhea rate than the CON group （P<0.05）.Consistent with this,the supplementation of *** improved the small intestinal morphology and structure,proportion of CD4+T lymphocytes in the blood,as well as the expression of genes related to intestinal barrier and antioxidant indices of pigs with ETEC challenge,especially for the LA group （P<0.05）.Meanwhile,*** supplementation reduced the expression of ETEC virulence factor genes in the ileum and colon of pigs challenged by ETEC （P<0.05）.Therefore,*** may protect the intestinal health of weaned piglets from damage caused by

关键词： Akkermansia muciniphila Weaned piglet Enterotoxigenic Escherichia coli challenge Intestinal health

Artificial parasin I protein(API)supplementation improves growth performance and intestinal health in weaned piglets challenged with enterotoxigenic Escherichiacoli

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Animal Nutrition 2024年第3期18卷 154-165页

作者： Congzhi Zou Wanxin Zhao Shenggang Yin Xiaoyu Xiang Jiayong Tang Gang Jia Lianqiang Che Guangmang Liu Xiaoling Chen Gang Tian Jingyi Cai Bo Kang Hua Zhao Key Laboratory for Animal Disease-resistance Nutrition of Ministry of Education Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Agriculture and Rural AffairsKey Laboratory for Animal Disease-Resistance Nutrition of Sichuan ProvinceAnimal Nutrition InstituteSichuan Agricultural UniversityChengdu 611130China College of Animal Science and Technology Sichuan Agricultural UniversityChengdu 611130China

Diarrheas are common risks faced by piglets during the weaning *** study investigated the alleviating effects of artificial parasin I protein(API)on growth performance and intestinal health of weaned pigs upon enterotoxigenic Escherichia coli(ETEC)*** piglets were randomly divided into five groups and fed a basal diet(CON)or basal diet supplemented with API at 0,750,and 1500 mg/kg or antibiotics for 5 *** d 15 and 25,piglets were challenged with ETEC K88 except for the CON *** the ETEC challenge(d 1–14),dietary API supplementation improved growth performance,and 750 mg API increased(P<0.05)the average daily gain(ADG),decreased(P<0.05)feed to gain ratio(F/G)and diarrhea index of weaned *** challenge(during d 15–35)reduced growth performance and increased(P<0.01)the F/G,diarrhea rate,and diarrhea *** event was accompanied by the numerically increased malondialdehyde(MDA)levels in serum and ileum,the decreased(P<0.05)zonula-occludens-1(ZO-1)and interleukin-6(IL-6)in the ileum,and the increased(P=0.04)secretory immunoglobulin A(sIgA)protein in the *** parasin I protein supplementation alleviated the negative impact of *** 750 mg/kg API inclusion elevated(P<0.05)ADG and decreased(P<0.05)F/*** levels of API decreased(P<0.01)the diarrhea rate and diarrhea ***,API inclusion decreased(P<0.01)the crypt depth in the jejunum,elevated(P<0.05)villus height in the duodenum and villus height to crypt depth ratio in the duodenum and ileum,up-regulated(P<0.05)ZO-1 gene,and down-regulated(P<0.05)mucin-2 gene in the jejunum,and 1500 mg/kg API decreased(P<0.01)sIgA level and down-regulated(P<0.05)IL-1βgene in the ***,750 mg/kg API elevated(P<0.01)Bifidobacteria population and acetic acid concentrations in the cecal *** conclusion,API supplementation alleviates the negative impact of ETEC on growth performance and intestinal health,thus can be applied as an antibiotic alternative in weane

关键词： Artificial parasin I protein Growth performance Intestinal barrier Diarrhea Weaned piglet