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In-situ observation of magnetization reversal process of Sm(Co,Cu,Fe,Zr)_z magnets with different Fe contents

Rare Metals 2020年第3期39卷 250-255页

作者： Shuo Wu Dong-Tao Zhang Ming Yue Yun-Qiao Wang Zhi-Feng Shang Dan Wu Jing-Ming Liang College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsMinistry of Education of ChinaBeijing University of TechnologyBeijing100124China

Sm(Co,Cu,Fe,Zr)z magnets have drawn much attention for high-temperature applications due to their high Curie temperature,strong corrosion resistance and thermal *** effect of increasing Fe content on the distribution of elements and squareness(Sr)of demagnetization curves were investigated for two kinds of magnets with different nominal compositions of Sm(CobalFe0.15-Cu0.07Zr0.03)7.8 and Sm(CobalFe0.28Cu0.07Zr0.03)6.6 in this *** magnetic properties of the magnets with higher Fe content fluctuate greatly after different solution treatments,indicating that they are more sensitive to the process *** increase in Fe content can obviously enhance the cellular phase ***,inhomogeneous Cu distribution is observed in the Sm(CobalFe0.28-Cu0.07Zr0.03)6.6 magnet,resulting in the different cellular structures and corresponding magnetic domain patterns in different regions in the inner ***,the lower Cu content regions are responsible for the wider magnetic domain,which have weaker resistance to applied magnetic *** a result,Sr of demagnetization curve decreases with the increase in Fe content due to the inhomogeneous Cu distribution,which was confirmed by in-situ observation of electron probe micro-analyzer(EPMA)and magneto-optical Kerr optical microscope(MOKE).

关键词： Sm(Co,Cu,Fe,Zr)_z magnets Cu distribution Microstructure Magnetic properties Magnetic domain Squareness

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3D-printed dermis-specific extracellular matrix mitigates scar contraction via inducing early angiogenesis and macrophage M2 polarization

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Bioactive Materials 2022年第4期7卷 236-246页

作者： Lei Chen Zhiyong Li Yongtai Zheng Fei Zhou Jingling Zhao Qiyi Zhai Zhaoqiang Zhang Tianrun Liu Yongming Chen Shaohai Qi Department of Burns Laboratory of General SurgeryThe First Affiliated HospitalSunYat-Sen UniversityGuangzhou510080China School of Materials Science and Engineering Centre of Functional BiomaterialsKey Laboratory of Polymeric Composite Materials and Functional Materials of Ministry of EducationGD Research Centre for Functional Biomaterials Engineering and TechnologySun Yat-sen UniversityGuangzhou510275China Department of Oral and Maxillofacial Surgery Stomatological HospitalSouthern Medical UniversityNo.366South of Jiangnan BoulevardGuangzhou510280China Department of Otorhinolaryngology Head and Neck Surgery The Sixth Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdongChina

Scar contraction frequently happens in patients with deep burn ***,porcine dermal extracellular matrix(dECM)has supplied microenvironments that assist in wound healing but fail to inhibit scar *** overcome this drawback,we integrate dECM into three-dimensional(3D)-printed dermal analogues(PDA)to prevent scar *** have developed thermally gelled,non-rheologically modified dECM powder(dECMp)inks and successfully transformed them into PDA that was endowed with a micron-scale spatial *** optimal crosslinked PDA exhibited desired structure,good mechanical properties as well as excellent ***,in vivo experiments demonstrated that PDA could significantly reduced scar contraction and improved cosmetic upshots of split thickness skin grafts(STSG)than the commercially available dermal templates and STSG *** PDA has also induced an early,intense neovascularization,and evoked a type-2-like immune ***’s superior beneficial effects may attribute to their desired porous structure,the well-balanced physicochemical properties,and the preserved dermis-specific ECM cues,which collectively modulated the expression of genes such as Wnt11,ATF3,and IL1β,and influenced the crucial endogenous signalling *** findings of this study suggest that PDA is a clinical translatable material that possess high potential in reducing scar contraction.

关键词： Extracellular matrix Dermal analogues Scar contraction Macrophage Angiogenesis

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Microstructure and mechanical properties of 3D printed ceramics with different vinyl acetate contents

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Rare Metals 2021年第11期40卷 3241-3250页

作者： He Li Yong-Sheng Liu Yan-Song Liu Qing-Feng Zeng Jing-Jing Liang Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Polytechnical UniversityXi’an 710072China NPU-SAS Joint Research Center of Advanced Ceramics Northwestern Polytechnical UniversityXi’an 710072China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

Stereolithography(SL)-based three-dimensional(3D) printing technique is an efficient method for the fabrication of alumina *** alumina slurry is difficult to obtain due to the barrier between hydrophilic alumina and oleophilic *** not only requires that the ceramic slurry possessed low viscosity and uniformity,but also requires that the slurry could complete the photocuring *** this study,vinyl acetate was added in the ceramic slurry as a bridge to connect alumina and resin,and the effects of vinyl acetate content on the microstructure and mechanical properties of the alumina ceramics were systematically *** results showed that the alumina ceramics were composed of three types of particles which included large aggregates,individual particles,and long-columnshaped *** shrinkage,bulk density,and crystallite size of the ceramics increased with the increase in vinyl acetate *** open porosity decreased with the increase in vinyl acetate *** flexural strength of the ceramics first increased and subsequently decreased with the increase in vinyl acetate *** shrinkage in Z direction was much greater than that in X or Y *** on the above results,the optimum vinyl acetate content for alumina slurry was 10 wt%,which resulted in sintered ceramic with the shrinkage of 15.6% in X direction,13.5% in Ydirection,21.9% in Z direction,bulk density of 1.9 g·cm^(-3),open porosity of 50.1%,and flexural strength of 24.4 *** sintered ceramics satisfy the requirement of alumina ceramic cores.

关键词： Stereolithography Alumina ceramics Vinyl acetate Microstructure Mechanical properties

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Surface-modified MXene/TLCP nanocomposites with enhanced electrical and thermal conductivity via in situ grafting polymerization

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Polymer 2025年 333卷

作者： Dong, Shihang Huang, Shuohan Liang, Yuan Chen, Lingzhe Wang, Ying Chen, Yuhan Ma, Ke Ju, Xueqin Xiang, Guanglei Wan, Hai Jin, Wenbin Wang, Yanping He, Yong Wei, Peng Xia, Yumin State Key Laboratory of Advanced Fiber Materials Key Laboratory of High Performance Fibers & Products Engineering Research Center of Technical Textiles Ministry of Education College of Materials Science and Engineering College of Physics Innovation Center for Textile Science and Technology in Donghua University Shanghai China College of Textiles Henan Key Laboratory of Functional Textile Materials Zhongyuan University of Technology Zhengzhou China

MXenes, an emerging class of two-dimensional transition metal carbides and nitrides, have garnered significant attention due to their exceptional electrical, thermal, and mechanical properties. However, achieving uniform dispersion of hydrophilic MXene nanosheets within a hydrophobic thermotropic liquid crystal polyester (TLCP) matrix presents a formidable challenge that limits their practical applications. In this study, we address this challenge through a direct surface modification approach to enhance the interfacial interaction between MXene and TLCP. The effects of modified MXene on TLCP performance were investigated through comprehensive material characterization. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analyses reveal that 6-aminohexanoic acid effectively mediates the interfacial interaction between MXene and TLCP molecules, preventing the aggregation of MXene nanosheets and facilitating their uniform dispersion throughout the TLCP matrix. The incorporation of modified MXene (Am-MXene) significantly enhances the thermal stability of the resulting nanocomposites, with the Am-50 %MXene/TLCP demonstrating a 27 C increase in the 5 % weight loss temperature compared to pristine TLCP. The nanocomposite achieves a notable electrical conductivity of 5.99 S/m while preserving the TLCP's intrinsic microstructure. Moreover, MXene incorporation enhances the orderliness and alignment of liquid crystal textures. The nanocomposite exhibits substantial improvements in thermal diffusivity (67 %), thermal conductivity (25 %), dielectric constant (318 %), and photothermal conversion temperature (84 %). These findings advance our understanding of designing multifunctional composite materials with enhanced performance characteristics. © 2025 Elsevier Ltd

关键词： Nanocomposites

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High entropy defective fluorite structured rare-earth niobates and tantalates for thermal barrier applications

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Journal of advanced Ceramics 2020年第3期9卷 303-311页

作者： Zifan ZHAO Heng CHEN Huimin XIANG Fu-Zhi DAI Xiaohui WANG Wei XU Kuang SUN Zhjjian PENG Yanchun ZHOU Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China School of Engineering and Technology China University of GeosciencesBejing 100083China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shanghai Chenhua Science and Technology Corporation Ltd. Shanghai 201804China

Rare-earth tantalates and niobates(REjTaO7 and REjNbO7)have been considered as promising candidate thermal barrier coating(TBC)materials in next generation gas-turbine engines due to their ultra-low thermal conductivity and better thermal stability than yttria-stabilized zirconia(YSZ).However,the low Vickers hardness and toughness are the main shortcomings of RE;TaO-and REjNbOr that limit their applications as TBC *** increase the hardness,high entropy(Yu3Ybu3Er/3)sTaOr,(Y13YbnErns)NbO,and(Sm1/6Eu1/6Y 1/6Yb1/6Lu1/6Er1/6)3(Nb1/2Ta1/2)O7 are designed and synthesized in this *** high entropy ceramics exhibit high Vickers hardness(10.912.0 GPa),close thermal expansion coefficients to that of single-principal-component RE3TaO,and RE;NbO,(7.9×10^-6-10.8×10-6 C-1 at room temperature),good phase stability,and good chemical compatibility with thermally grown Al2O3,which make them promising for applications as candidate TBC materials.

关键词： high entropy ceramics defective fluorite structure rare-earth niobates/tantalates thermal barrier coating material

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Structure and magnetic properties of nanocrystalline dysprosium powders

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Rare Metals 2020年第1期39卷 28-35页

作者： Hong-Jian Li Qiong Wu Ming Yue Yu-Qing Li Rong-Chun Zhu Jing-Ming Liang Jiu-Xing Zhang College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsMinistry of Education of ChinaBeijing University of TechnologyBeijing100124China

In this current study,nanocrystalline Dy powders were prepared by melt-spinning and subsequent highenergy *** effect of ball-milling time on the structure and magnetic properties of the powders was *** crystal structure and microstructure of the melt-spun ribbons and ball-milled powders were observed by X-ray diffraction(XRD),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).Magnetic measurement of all samples was performed with vibrating sample magnetometer(VSM).XRD results indicate that the average crystal grain size of the powders decreases from 90.09 nm of the ribbons to 10.42 nm of the4-h ball-milled *** TEM observation shows that the grains are fine and *** Neel temperature(TN)decreases from 182 K of the ribbons to 172 K of the powders,while the Curie temperature(TC)increases from100 to 130 K,demonstrating that the grain size has substantial influence on the magnetic transition ***,at 60 K,as the ball-milling time increases,the coercivity of the powders increases first,peaking at 0.48 T for 2-h milling,then drops again,while the remanence of the powders decreases monotonic *** a result,the powders milled for 2 h exhibit an optimal maximum energy product of 64.0 kJ·m-3,demonstrating the good potential of these powders as a permanent magnet at low temperatures.

关键词： Dysprosium Nanocrystalline Low temperature Magnetic properties

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Suppression of voltage decay through adjusting tap density of lithium-rich layered oxides for lithium ion battery

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Journal of Materials science & technology 2020年第23期58卷 107-113页

作者： Muhammad Zubair Errui Wang Yinzhong Wang Boya Wang Lin Wang Yuan Liang Haijun Yu College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsEducation Ministry of ChinaBeijing University of TechnologyBeijing 100124China

The voltage decay of lithium-rich layered oxides(LLOs)is still one of the key challenges for their application in commercial battery although these materials possess the advantages of high specific capacity and low *** this work,the relationship between voltage decay and tap density of LLOs has been *** voltage decay can be significantly suppressed with the increasing tap density as well as the homogenization of the primary or secondary particle size of agglomerated spherical *** results have shown that an extreme small voltage decay of 0.98 m V cycle^(-1)can be obtained through adjusting the tap density of agglomerated spherical LLOs to 1.99 g cm^(-3),in which the size of primary and secondary particles are *** work offers a new insight towards the voltage decay and capacity fading of LLOs through precursor preparation process,promoting their application in the real battery in the future.

关键词： Lithium-rich layered oxides Tap density Agglomerated spherical particle Voltage decay Cycle stability

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High-temperature mechanical behavior of ultra-coarse cemented carbide with grain strengthening

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Journal of Materials science & technology 2022年第9期104卷 8-18页

作者： Huaxin Hu Xuemei Liu Jinghong Chen Hao Lu Chao Liu Haibin Wang Junhua Luan Zengbao Jiao Yong Liu Xiaoyan Song Faculty of Materials and Manufacturing Key Laboratory of Advanced Functional MaterialsMinistry of Education of ChinaBeijing University of TechnologyBeijing 100124China Xiamen Tungsten Co. Ltd.Xiamen 361009China Department of Materials Science and Engineering City University of Hong KongHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

Ultra-coarse grained cemented carbides are often used under conditions of concurrently applied stress and high *** of high-temperature mechanical performance of ultra-coarse grained cemented carbides is highly desirable but still a big *** this study,it is proposed that the hightemperature compression strength of ultra-coarse cemented carbides can be enhanced by modulating hard matrix grains by activated Ta C nanoparticles,through solid solution strengthening of Ta *** on the designed experiments and microstructural characterizations combined with finite element simulations,the grain morphology,stress distribution and dislocation configuration were studied in detail for ultra-coarse grained cemented *** mechanisms of Ta dissolving in WC crystal and strengthening ultra-coarse grains through interaction with dislocations were disclosed from the atomic *** study opens a new perspective to modulate hard phases of cemented carbides for improving their hightemperature performance,which will be applicable to a variety of cermet and ceramic-based composite materials.

关键词： Ultra-coarse cemented carbides High-temperature compressive behavior Strengthening of hard-phase grains Dislocation motion

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High-entropy(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3:A promising thermal/environmental barrier material for oxide/oxide composites

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Journal of Materials science & technology 2020年第12期47卷 45-51页

作者： Zifan Zhao Heng Chen Huimin Xiang Fu-Zhi Dai Xiaohui Wang Wei Xu Kuang Sun Zhijian Peng Yanchun Zhou Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing100076China School of Engineering and Technology China University of GeosciencesBeijing 100083China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Shanghai Chenhua Science and Technology Corporation Limted Shanghai201804China

Yttrium aluminum perovskite(YAl O3)is a promising candidate material for environmental barrier coatings(EBCs)to protect Al2 O3 f/Al2 O3 ceramic matrix composites(CMCs)from the corrosion of high-temperature water vapor in combustion ***,the relatively high thermal conductivity is a notable drawback of YAl O3 for environmental barrier coating ***,in order to make REAl O3 more thermal insulating,a novel high-entropy rare-earth aluminate ceramic(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3 was designed and *** as-prepared(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3 ceramic possesses close thermal expansion coefficient(9.02×10-6/oC measured from room temperature to 1200℃)to that of Al2 *** thermal conductivity of(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3 at room temperature is 4.1 W·m-1K-1,which is almost one third of the value of YAl ***,to effectively prevent the penetration of water vapor from possible pores/cracks of coating layer,which are often observed in T/EBCs,a tri-layer EBC system REAl O3/RE3 Al5 O12/(Al2 O3 f/Al2 O3 CMCs)is *** thermal expansion coefficient to Al2 O3 and low thermal conductivity of(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3,as well as the formation of dense garnet layer at(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3/Al2 O3 interface,indicate that this new type of high-entropy ceramic is suitable as a candidate environmental barrier coating material for Al2 O3 f/Al2 O3 CMCs.

关键词： High-entropy ceramics (Y0.2Nd0.2Sm0.2Eu0.2Er0.2AlO3 Tri-layer EBC system Low thermal conductivity Al2O3f/Al2O3 CMCs

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3d Necklace-Like Carbon Nanofiber Framework Implanted with Sn-Cao-Casno3 composite Invigorated Highly Efficient Polysulfide and Lithium Regulation

SSRN

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SSRN 2025年

作者： Liu, Zhitong Tian, Yuan Wang, Cheng Institute for New Energy Materials and Low-Carbon Technologies Tianjin Key Laboratory of Advanced Functional Porous Materials School of Materials Science and Engineering Tianjin University of Technology Tianjin300384 China

Lithium-sulfur (Li-S) batteries have attracted considerable attention in the next-generation energy storage system due to their higher theoretical energy density than traditional rechargeable batteries. Nevertheless, the short life and safety hazards that arise from its severe shuttling effect towards lithium polysulfides and Li dendrite growth limit practical applications of Li-S batteries. Here, we prepared a 3D free-standing bifunctional host consisting of necklace-like nitrogen-doped carbon nanofiber framework modified with Sn-CaO-CaSnO3 composites (Sn-CaO-CaSnO3@NC) through the electrospinning method. Combining electrochemical and computational analysis, the sophisticated host renders fast Li-ion transport, strong chemisorption, superior electrocatalytic activity and uniform lithium deposition. Benefiting from the above advantages, the assembled Li-S full batteries with Sn-CaO-CaSnO3@NC host realized a significantly optimized electrochemical performance, including a high initial capacity of 1099 mAh g-1 at 0.5 C with a low decay of 0.014% per cycle, an excellent high-rate capability up to 5 C and good cycling stability at the high sulfur loading of 8.2 mg cm-2 at 0.1 C over 100 cycles. This work provides a promising avenue for future design of high-performance bifunctional lithiophilic and sulfiphilic host. © 2025, The Authors. All rights reserved.

关键词： Lithium sulfur batteries

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