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Fabrication of wear-resistant PA6 composites with superior thermal conductivity and mechanical properties via constructing highly oriented hybrid network of SiC-packed BN platelets

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Journal of materials Science & technology 2023年第15期146卷 200-210页

作者： Jing Chen Jiaming Zhu Yang Pan Hong Wu Shaoyun Guo Jianhui Qiu The State Key Laboratory of Polymer Materials Engineering Sichuan Provincial Engineering Laboratory of PlasticRubber Complex Processing TechnologyPolymer Research Institute of Sichuan UniversityChengdu 610065China Jiangsu Industrial Technology Research Institute of Advanced Polymer Materials Nanjing 211899China Department of Mechanical Engineering Faculty of Systems Science and TechnologyAkita Prefectural UniversityAkita 015-0055Japan

Herein,a strong extensional and shearing field was introduced to construct highly oriented hybrid networks of silicon carbide(SiC)-packed boron nitride(BN)platelets to fabricate high-performance wearresistant PA6 *** show that in-plane and through-plane thermal conductivity(TC)of the prepared PA6 composites with a total filler loading of 20 wt.%reached 1.31 and 0.35 W/(m K),352%and 25%higher than those of pure PA6,*** is attributed to the highly oriented hybrid network that facilitates the formation of efficient thermal conductivity *** monitoring results during friction confirm that high TC favors the friction heat dissipation ***,the yield strength of PA6 composites increased by 39.1%and they still have excellent ductility with an elongation at break of 207.1%.Finally,the wear rate of PA6 composites decreased sharply by 92.5%.This method can be used to manufacture advanced linear bearing and guideway parts,etc。

关键词： Polymer-matrix composites(PMCs) Hybrid Wear Thermal properties

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Optimizing energy harvesting performance by tailoring ferroelectric/relaxor behavior in KNN-based piezoceramics

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Journal of advanced Ceramics 2022年第6期11卷 935-944页

作者： Yu HUAN Xinjian WANG Wenyu YANG Limin HOU Mupeng ZHENG Tao WEI Xiaohui WANG School of Materials Science and Engineering University of JinanJinan 250022China Key Laboratory of Advanced Functional Materials Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Piezoelectric energy harvesters(PEHs)fabricated using piezoceramics could convert directly the mechanical vibration energy in the environment into electrical *** high piezoelectric charge coefficient(d_(33))and large piezoelectric voltage coefficient(g_(33))are key factors for the high-performance ***,high d_(33)and large g_(33)are difficult to simultaneously achieve with respect to g_(33)=d_(33)/(e_(0)e_(r))and d_(33)=2Qe_(0)e_(r)P_(r).Herein,the energy harvesting performance is optimized by tailoring the CaZrO_(3)content in(0.964−x)(K_(0.52)Na_(0.48))(Nb_(0.96)Sb_(0.04))O_(3)-0.036(Bi_(0.5)Na_(0.5))ZrO_(3)-xCaZrO_(3)***,the doping CaZrO_(3)could enhance the dielectric relaxation due to the compositional fluctuation and structural disordering,and thus reduce the domain size to~30 nm for x=0.006 *** nanodomains switch easily to external electric field,resulting in large ***,the rhombohedral-orthorhombic-tetragonal phases coexist in x=0.006 sample,which reduces the polarization anisotropy and thus improves the piezoelectric *** multiphase coexistence structures and miniaturized domains contribute to the excellent piezoelectric properties of d_(33)(354 pC/N).Furthermore,the dielectric relative permittivity(ε_(r))reduces monotonously as the CaZrO_(3)content increases due to the relatively low ion polarizability of Ca^(2+)and Zr^(4+).As a result,the optimized energy conversion coefficient(d_(33)×g_(33),5508×10^(−15)m^(2)/N)is achieved for x=0.006 *** importantly,the assembled PEH with the optimal specimen shows the excellent output power(~48 mW)and lights up 45 red commercial light-emitting diodes(LEDs).This work demonstrates that tailoring ferroelectric/relaxor behavior in(K,Na)NbO_(3)-based piezoelectric ceramics could effectively enhance the electrical output of PEHs.

关键词： piezoelectric energy harvesters(PEHs) potassium sodium niobate(KNN) relaxor ferroelectric miniaturized domains multiphase coexistence

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CO_(2) adsorption and activation on p-block catalyst Ga_(2)O_(3)

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Science China materials 2025年第2期68卷 590-596页

作者： Zhizhuang Liu Xiaoxu Kuang Baowen Li Chenghua Sun Rong Tu Song Zhang Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou 521000China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Department of Chemistry and Biotechnology Swinburne University of TechnologyHawthornVictoria 3122Australia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The fixation and conversion of CO_(2)frommedium-and high-temperature industrial exhaust gases arescientifically important and challenging tasks owing to theharsh conditions ***_(2)O_(3),a stable p-block compound,is surprisingly active in the thermal conversion of hot CO_(2)waste gas,but its underlying mechanism remains *** study,we investigated CO_(2)adsorption and activationacross 11 different Ga_(2)O_(3)-terminated faces using densityfunctional *** transfer and chemical bond analysesrevealed the occurrence of two distinct activation mechanismsinvolving synchronous electron gain and loss,driven by astrong synergetic effect between Ga cations and O anions onthe substrate *** Ga-O synergy enhances the CO_(2)activation efficiency compared with single active sites,with CO_(2)^(δ+) cation more readily capturing H atom than CO_(2)^(δ–).Tothe best of our knowledge,such a dual activation mechanismhas not been reported before,particularly for p-block *** findings provide new insights into the direct catalyticconversion of CO_(2)emissions and offer strategies for the rational design of industrial-grade catalysts for medium-andhigh-temperature CO_(2)tail gas conversion.

关键词： p-block catalyst gallium oxide carbon dioxide density functional theory synergetic mechanism

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Formation mechanism of partial stacking faults by incompletemixed-mode phase transformation: A case study of Fe-Ga alloys

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Journal of materials Science & technology 2022年第22期117卷 59-64页

作者： Tianzi Yang Tianyu Ma Feng Liu Xiaobing Ren Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of Materialsand MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Solidification Processing and Analytical and Testing Center Northwestern Polytechnical UniversityXi’an 710072China Center for Functional Materials National Institute for Materials ScienceTsukuba 305-0047IbarakiJapan

Partial stacking faults(PSFs) formed by incomplete mixed-mode phase transformation have been found to exhibit unfixed slip distance of closely-packed planes unlike those of the deformation-induced stacking faults(SFs) with fixed distance. Though engineering PSFs can yield appealing properties, such as the enhanced damping capacity, understanding of the interaction between lattice distortion and atomic diffusion and their influences on forming PSFs is still far from being clear. Herein we performed a case study on aged Fe-Ga alloy that undergoes a mixed-mode phase transformation from body-centered cubic(BCC)to ordered face-centered cubic(FCC). The TEM investigations showed that the faulted {111}-FCC distance of the PSFs is shorter than a/6<112> of the typical {111}-<112> SFs in deformed FCC materials and the PSFs have disordered Fe and Ga arrangements. Further studies revealed that such PSFs will not be completely dissociated at FCC twin boundaries(TBs) even after long term isothermal aging. Consequently,the formation of PSFs can be ascribed to the transformation-dependent atomic ordering and lattice shear strain of the parent BCC lattice, where the diffusion-controlled glides of the PSFs-associated dislocations will accelerate atomic diffusions due to the dislocation-pipe effect along <112>-FCC direction, but may hinder the atomic diffusions across the {111}-FCC TBs due to the retarding effect. This study may add important insight into the defects process during mixed-mode phase transformation and broaden the knowledge of the interaction between concurrently-happened lattice distortion and atomic diffusion.

关键词： Stacking faults Mixed-mode phase transformation Diffusion Lattice distortion Fe-Ga alloy

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Anomalous enhancing effects of electric pulse treatment on strength and ductility of TC17 linear friction welding joints

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Journal of materials Science & technology 2024年第36期203卷 155-166页

作者： Xin Zhang Junjie Zhang Yunkui Yao Qingsong Qiao Lixing Zhao Leichang Liu Feng Jin Mei Zhan Hongwei Li Key Laboratory of High-Performance Manufacturing for Aero Engine Ministry of Industry and Information TechnologyNorthwestern Polytechnical UniversityXi’an 710072China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Ministry of EducationNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi’an 710072China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Mechanical properties of TC17 titanium alloy undergo a significant reduction after linear friction welding(LFW),of which the strength and ductility are hard to be improved simultaneously by traditional aging heat treatment(AHT),seriously limiting the application of LFW in the manufacturing of TC17 titanium alloy *** this end,the present work proposes to use electric pulse treatment(EPT)to enhance the strength and ductility of TC17 LFW joints simultaneously by improving its *** results show that,in comparison to the uneven distribution ofαphases in the welding zone(WZ),heat-affected zone(HAZ),and base metal(BM)zone after AHT,EPT can selectively homogenize theαphase distribution of WZ and HAZ without impacting the *** selective effect of EPT is reflected as the synergistic influence of the local Joule heating effect and the electron wind effect,which promotes the diffusion ofβphase stabilizing element Mo and leads to a competitive precipitation ofβphase andαphase in theαphase transition temperature *** ratio ofαphase toβphase in the WZ and HAZ finally approaches an equilibrium point which is similar to that of BM,leading to a uniform distribution ofαphase and realizing the synergy of strength-ductility of LFW joint:the maximum strength increase observed is 12.9%,accompanied by a corresponding elongation increase of 122%(by AHT&EPT),and the maximum plasticity improvement is 185%,accompanied by a corresponding strength increase of 4.3%(by EPT for 1 h).This study provides essential insights for improving the strength and ductility of LFW TC17 titanium alloy blisks and enhancing the applications of LFW in aeroengine components.

关键词： Linear friction welding TC17 titanium alloy Electric pulse treatment Phase transformation Local joule heating effect

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Chinese Chemical Letters 2024年第8期35卷 25-35页

作者： Yatian Deng Dao Wang Jinglan Cheng Yunkun Zhao Zongbao Li Chunyan Zang Jian Li Lichao Jia School of Materials Science and Engineering State Key Lab of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074China College of Science Qiongtai Normal UniversityHaikou 571127China Kunming Sino-Platinum Metals Catalyst Co. Ltd.Kunming 650106China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and TechnologyWuhan 430074China

Catalyst with high performance has drawn increasing attention recently due to its significant advantages in chemical reactions such as speeding up the reaction,lowering the reaction temperature or pressure,and proceeding without itself being *** the superior catalytic performance of precious metal catalysts,transition metal oxides offer a promising route for substitution of precious metals in catalysis arising from their low cost,intrinsic activity and sufficient ***-type oxide SmMn_(2)O_(5) exhibits a unique crystal structure containing double crystalline fields,and nowadays is used widely as the catalyst in different chemical reactions,including the reactions of vehicle emissions reduction and oxygen evolution reaction,gas sensors,and metal-air batteries,promoting attention in catalytic perfor-mance *** our knowledge,there is no review article covering the comprehensive informa-tion of SmMn2 O 5 and its *** we review the recent progress in understanding of the crys-tal structure of SmMn_(2)O_(5) and its basic physical *** then summarize the catalytic sources of SmMn_(2)O_(5) and reaction mechanisms,while the strategies to improve catalytic performance of SmMn_(2)O_(5) are further ***,we provide a perspective on how to make further progress in catalytic applications.

关键词： Catalyst SmMn_(2)O_(5) Mullite-type oxide Catalytic oxidation Oxygen reduction reaction Oxygen evolution reaction Reaction mechanisms

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In Vitro Angiogenic Behavior of HUVECs on Biomimetic SF/SA Composite Scaffolds

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Journal of Wuhan University of technology(materials Science) 2021年第3期36卷 456-464页

作者： KOMBO Omar Ramadhan WANG Xinyu SHEN Ying LIU Jiawei DONG Xianzhen SHAO Qi LONG Yanpiao DONG Kuo BAKHET Shahd Fateh El-Rahman Elkhider LI Binbin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Biomedical Materials and Engineering Research Center of Hubei Province Wuhan 430070China

The 60Fc and 70Fc SF/SA blend scaffolds were prepared to mimic the functions of the native ECM for skin *** Umbilical Vein Endothelial Cells(HUVECs)were used to examine the cell cytotoxicity,adhesion,growth factors secretion and the gene expression of associated angiogenic *** proliferation,adhesion and live-dead analyses showed that HUVECs could better attach,grow,and proliferate on the 70Fc scaffolds compared with 60Fc scaffolds and unmodified ***,the 70Fc scaffolds showed higher levels of specific angiogenic proteins and genes expression as *** study suggests that the involvement of higher composition of SF(about 70%)than that of SA on the blended scaffolds could be advantageous as it is more suitable to promote angiogenesis,which is potential for vascularization during skin repair.

关键词： vascularization scaffold HUVECs tissue engineering

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Single‑Atom Catalysts:Advances and Challenges in Metal‑Support Interactions for Enhanced Electrocatalysis

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Electrochemical Energy Reviews 2022年第1期5卷 145-186页

作者： Yang Mu Tingting Wang Jian Zhang Changgong Meng Yifu Zhang Zongkui Kou School of Chemical Engineering Dalian University of TechnologyDalian 116024LiaoningChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074HubeiChina

Single-atom catalysts(SACs),which contain a single metal atom supported on a well-confined substrate,are among the most promising heterogeneous catalysts owing to their unique advantages,such as high intrinsic activity and selectivity,tunable bonds and coordination,abundant metal-containing active sites,and atomic *** metal-support interactions(MSIs)in SACs exert a substantial influence on the catalytic properties,gaining a profound understanding and recognition of catalytic reactions depends greatly on investigating MSIs both experimentally and ***,the engineer-ing and modulation of MSIs are regarded as one of the most efficient methods to rationally design SACs with disruptively enhanced catalytic *** this review,we track the recent advances in SACs from an MSI *** then discuss the existing MSIs in SACs and elucidate the significant role of strong MSIs in catalytic properties and *** chal-lenges hindering the rational design of supported SACs with strong MSIs,which are currently still far from being completely understood and overcome,are *** addition,the correlation between strong MSIs and electrocatalytic activities in SACs,including an outlook to increase our understanding of MSIs,is ***,the present review provides some perspectives and an in-depth understanding of strong MSIs to advance high-performing SACs.

关键词： Metal-support interaction Single-atom catalysts Electrocatalysis ORR and OER HER and HOR

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Total conversion of centimeter-scale nickel foam into single atom electrocatalysts with highly selective CO_(2)electrocatalytic reduction in neutral electrolyte

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Nano Research 2023年第2期16卷 2003-2010页

作者： Qikui Fan Pengfei Gao Shan Ren Yunteng Qu Chuncai Kong Jian Yang Yuen Wu Ministry of Education Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic PhysicsSchool of PhysicsXi’an Jiaotong UniversityXi’an 710049China Shenzhen Key Laboratory of Special Functional Materials Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China Northwest Institute of Nuclear Technology Xi’an 710024China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China State Key Laboratory of Photoelectric Technology and Functional Materials International Collaborative Center on Photoelectric Technology and Nano Functional MaterialsInstitute of Photonics and Photon-TechnologyNorthwest UniversityXi’an 710069China Department of Chemistry iChEM(Collaborative Innovation Center of Chemistry for Energy Materials)University of Science and Technology of ChinaHefei 230026China

To improve the atomic utilization of metals and reduce the cost of industrialization,the one-step total monoatomization of macroscopic bulk metals,as opposed to nanoscale metals,is *** this study,we used a thermal diffusion method to directly convert commercial centimeter-scale Ni foam to porous Ni single-atom-loaded carbon nanotubes(CNTs).As expected,owing to the coating of single-atom on porous,highly conductive CNT carriers,Ni single-atom electrocatalysts(Ni-SACs)exhibit extremely high activity and selectivity in CO_(2)electroreduction(CO_(2)RR),yielding a current density of>350 mA/cm^(2),a selectivity for CO of>91%under a flow cell configuration using a 1 M potassium chloride(KCl)*** on the superior activity of the Ni-SACs electrocatalyst,an integrated gas-phase electrochemical zero-gap reactor was introduced to generate a significant amount of CO current for potential practical *** overall current can be increased to 800 mA,while maintaining CO Faradaic efficiencies(FEs)at above 90%per unit *** findings and insights on the active site transformation mechanism for macroscopic bulk Ni foam conversion into single atoms can inform the design of highly active single-atom catalysts used in industrial CO_(2)RR systems.

关键词： Ni single atom electrocatalyst CO_(2)electroreduction to CO neutral electrolyte thermal diffusion

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Yb:CaF_(2)-YF_(3)transparent ceramics ultrafast laser at dual gain lines

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Chinese Physics B 2022年第11期31卷 336-340页

作者： Xiao-Qin Liu Qian-Qian Hao Jie Liu Dan-Hua Liu Wei-Wei Li Liang-Bi Su Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250358China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Yb^(3+):CaF_(2)–YF_(3)transparent ceramics with excellent optical quality was successfully fabricated by hot-pressed *** laser properties of this ceramics were investigated for the first *** diode(LD)was applied as the pump source to generate a dual-wavelength mode-locked(ML)*** maximum average output power was 310 mW,which represents the highest output power of ultrafast calcium fluoride ceramic *** spectrum separated at 1048.9 nm and 1049.7 nm with a total pulse duration of 8.9 *** interval period between the beating signals was about 4.3 ps,corresponding to a 0.23 THz beat pulse repetition *** results demonstrate its potential in producing dual-wavelength ultrashort *** Yb^(3+):CaF_(2)–YF_(3)ceramics with low-cost and short-preparation period are ideal candidate materials for ultrafast lasers.

关键词： transparent ceramics passively mode-locking dual-wavelength laser

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