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Evolutions of mechanical and thermal properties of TmNbO_(4)/Tm_(3)NbO_(7) composites as protective coating materials

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Journal of advanced Ceramics 2024年第11期13卷 1771-1785页

作者： Jiankun Wang Lin Chen Baihui Li Hao Xu Xiang Jiang Jing-Feng Li Jing Feng Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Southwest United Graduate School Kunming 650092China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

High fracture toughness,low thermal conductivity,and thermal expansion coefficient(TEC)matching substrate are essential for thermal barrier coatings(TBCs)and abradable seal coatings(ASCs).In this work,TmNbO_(4)/Tm_(3)NbO_(7) composites are designed and synthesized to increase their fracture toughness(KIC)and thermal insulation *** with those of TmNbO_(4)(KIC=2.2±0.1 MPa·m^(1/2))and Tm_(3)NbO_(7)(KIC=1.7±0.2 MPa·m^(1/2)),the increments in fracture toughness are as high as 50.0%and 91.1%,*** highest toughness reaches 3.3±0.4 MPa·m^(1/2),which is attributed to the superior combination of grains between TmNbO_(4) and Tm_(3)NbO_(7),as well as the simultaneous effects of microcracks and crack bridging and *** estimation of the effect of the interfacial thermal resistance on the thermal conductivity at low temperatures was achieved using the minimum interfacial thermal resistance model.A novel method is proposed to inhibit radiative heat transfer by utilizing oxides with glass-like thermal conductivity to suppress thermal ***,the TmNbO_(4)/Tm_(3)NbO_(7) composite maintains a low thermal conductivity(1.19–2.02 W·m^(−1)·K^(−1))at 1000°*** high TECs(10.4×10^(−6)–11.8×10^(−6)·K^(−1) at 1500°C)and excellent high-temperature stability ensure that the designed TmNbO_(4)/Tm_(3)NbO_(7) composites can be used at temperatures reaching 1500°***,simultaneous enhancement of fracture toughness and thermal insulation in TmNbO_(4)/Tm_(3)NbO_(7) composites is effective,and the revealed mechanisms are useful for various materials.

关键词： thermal barrier coatings(TBCs) toughening mechanisms composites thermal conductivity thermal expansion thermal radiation

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Investigation on the temperature-dependent diffusion growth of intermetallic compounds in the Mg-Al-Zn system:Experiment and modeling

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Journal of Magnesium and Alloys 2024年第8期12卷 3394-3408页

作者： Kaiming Cheng Yan Zheng Jiaxing Sun Yafei Zhao Jin Wang Huan Yu Dongqing Zhao Hang Li Jixue Zhou Zhenyu Ma Junmin Wang Cuiping Guo Xitao Wang Lijun Zhang Yong Du Shandong Provincial Key Laboratory of High Strength Lightweight Metallic Materials Advanced Materials InstituteQilu University of Technology(Shandong Academy of Sciences)Jinan250014China Laboratory of Materials Phase Equilibria and New Materials Design School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Technology R&D Center Shandong Qiangang Metal Technology Co.LtdJining272000China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China

With the rapid development of Mg alloys,deeper understanding to the thermodynamic and diffusional kinetic behavior of intermetallic compounds(IMCs)is important for studying the effect of alloying elements to the microstructure ***,a systematic quantitative investigation on the diffusional growth of IMCs is of great ***,the works studying the elemental diffusion behaviors of multiple-element IMCs are rare in magnesium alloy *** current work takes the ternary Mg-Al-Zn system as research target,and combines the diffusion couple technique,phase stability diagrams,in-situ observation technique and numerical inverse method to investigate the temperature-dependent kinetic *** parabolic growth constant(PGC)and interdiffusion coefficients for Mg solid-solution phase andγ-Mg_(17)Al_(12),β-Mg_(2)Al_(3),ε-Mg_(23)Al_(30),MgZn_(2),Mg_(2)Zn_(3),τ-Mg_(32)(Zn,Al)49 andφ-Mg_(5)Zn_(2)Al_(2) IMCs in the Mg-Al-Zn alloy system are *** comparing the current experimental with calculation results,the rate-controlling factor of the temperature-dependent diffusion growth ofφ,τandεternary IMCs in the Mg-Al-Zn system is further discussed in detail.

关键词： Diffusion couple Phase stability diagram Numerical inverse method(NIM) Interface migration High-temperature laser-scanning confocal microscopy(HTLSCM)

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Hetero-Janus Nanofibers as an Ideal Framework for Promoting Water-pollutant Photoreforming Hydrogen Evolution

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Energy & Environmental materials 2023年第5期6卷 317-329页

作者： Jie Liu Xinghua Li Chaohan Han Mingzhuang Liu Xiaowei Li Jianmin Sun Changlu Shao Center for Advanced Optoelectronic Functional Materials Research and Key Laboratory of UV Light-Emitting Materials and Technology of Ministry of EducationNortheast Normal UniversityChangchun 130024China State Key Laboratory of Urban Water Resource and Environment MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and StorageSchool of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150080China

Photoreforming hydrogen evolution(Pr-HE)of a water-pollutant system could simultaneously achieve efficient hydrogen production and pollutant *** provides a new way to solve energy and environmental issues,but the poor internal charge separation still limits its *** work designed hetero-Janus nanofibers(HJNFs)with ordered electric field distribution and separated redox surfaces to promote Pr-HE of the water-pollutant *** ZnO/NiO heterojunction as an example,the hetero-Janus structures were prepared via"Dual-channel"electrospinning and further confirmed by the element morphology analysis and asymmetric distribution of the XPS *** theoretical simulation showed that Janus structures could effectively inhibit the electron trap and hole trap generation,then accelerate the directional carrier migration to the *** investigations also confirmed that Janus structures could effectively suppress internal exciton luminescence and accelerate surface charge *** Pr-HE amount and the corresponding propranolol(PRO)degradation rate of HJNFs were 7.9 and 1.5 times higher than hetero-mixed nanofibers(HMNFs).The enhancement factor of Pr-HE in water-PRO to pure water was about 3.1,but nearly zero for *** prominent synergistic effect was due to the enhancement of charge separation and the inhibition of cascade side reaction from hetero-Janus ***,the synchronous Pr-HE and degradation reactions were significantly promoted by selective introducing Ag nanoparticles in one side of the HJNFs for enlarging the interfacial Fermi energy level *** hetero-Janus strategy offers a new perspective on designing efficient photoreforming photocatalysts for energy and environment applications.

关键词： electrospinning hetero-Janus nanofibers hydrogen evolution photoreforming pollutant degradation

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Large‑scale Fabrication of Snake‑skin‑inspired Protective Composite textiles

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advanced Fiber materials 2024年第4期6卷 978-992页

作者： Qing Liu Fengxiang Chen Tingting Dong Woong‑Ryeol Yu Chaoyu Chen Gaoming Jiang Zhijia Dong Pibo Ma Engineering Research Center of Knitting Technology Ministry of EducationCollege of Textile Science and EngineeringJiangnan UniversityWuxi 214122P.R.China State Key Laboratory of New Textile Materials and Advanced Processing Technologies/National Local Joint Laboratory for Advanced Textile Processing and Clean Production/Hubei Key Laboratory of Digital Textile Equipment Wuhan Textile UniversityWuhan 430200P.R.China Department of Materials Science and Engineering and Research Institute of Advanced Materials Seoul National UniversitySeoul 08826Republic of Korea

Inspired by the overlapping structure of snake scales,a reinforced scale-like knitted fabric(R-SLKF)was created in this *** achieve this,short carbon fibers in an epoxy resin(ER)matrix were incorporated into the scales of an *** resulting textile is a highly stable protective composite that is flexible,warm,and thermally *** addition,supe-rior stab-resistance is ensured through rigid protective blocks in the R-SLKF,making up a hard overlapping scale region,besides satisfactory flexibility via soft twisted ultra-high-molecular-weight polyethylene yarn-based *** R-SLKF achieves high stab resistance(peak load of approximately 600 N for a single scale thickness of 2 mm),good flexibility(~290 mN cm),and breathability(100 MPa,423 mm/s),coupled with good warmth retention and thermal insulation prop-erties(0.28℃/s),which are superior to previously reported protective composite *** the results,the combination of desirable individual protection,excellent wearability and comfort enables human beings to survive in extremely danger-ous *** element simulations provided valuable insights into the factors influencing the stab resistance of R-SLKF and elucidated the underlying anti-puncture mechanism in accordance with the experimental *** study presents a novel strategy for the facile industrial fabrication of flexible and lightweight protective composite textiles,which is expected to enhance the structure and material design for future innovations and provide advantages for personal protec-tive equipment in various industrial fields.

关键词： Scale-like knitted fabric Stab-resistance Flexibility Air permeability Warmth retention and thermal insulation properties

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Chlorinated Effects of Double-Cable Conjugated Polymers on the Photovoltaic Performance in Single-Component Organic Solar Cells

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Chinese Journal of Polymer Science 2023年第2期41卷 187-193页

作者： Han-Yi Bao Zhao-Fan Yang Yan-Jiao Zhao Xiang Gao Xin-Zhu Tong Yi-Nuo Wang Feng-Bo Sun Jian-Hong Gao Wei-Wei Li Zhi-Tian Liu Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials Hubei Key Laboratory of Plasma Chemistry and Advanced MaterialsSchool of Materials Science and EngineeringWuhan Institute of TechnologyWuhan430205China Beijing Advanced Innovation Center for Soft Matter Science and Engineering&State Key Laboratory of Organic-Inorganic Composite Beijing University of Chemical TechnologyBeijing100029China

The recently emerged double-cable conjugated polymers have come into focus due to their significantly improved power conversion efficiencies (PCEs) in single-component organic solar cells (SCOSCs). In this work, the effect of chlorination in double-cable conjugated polymers with linear benzodithiophene backbone and pendant perylene bisimide on the photovoltaic performance in SCOSCs has been studied. After introducing chlorine atoms into conjugated side chains, the highest occupied molecular orbital level of the conjugated polymers is down-shifted, thus resulting in a higher open-circuit voltage. As a result, the chlorinated double-cable conjugated polymer exhibits improved photovoltaic performance from 3.46% to 3.57%.

关键词： Double-cable conjugated polymer Chlorination Single-component organic solar cells

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A cascade of in situ conversion of bicarbonate to CO_(2) and CO_(2) electroreduction in a flow cell with a Ni-N-S catalyst

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Journal of Energy Chemistry 2024年第1期88卷 183-193,I0005页

作者： Linghui Kong Min Wang Yongxiao Tuo Shanshan Zhou Jinxiu Wang Guangbo Liu Xuejing Cui Jiali Wang Luhua Jiang Nanomaterials and Electrocatalysis Laboratory College of Materials Science and EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina State Key Laboratory of Heavy Oil Processing College of New EnergyChina University of Petroleum(East China)Qingdao 266580ShandongChina

Combination of CO_(2) capture using inorganic alkali with subsequently electrochemical conversion of the resultant HCO_(3)^(-)to high-value chemicals is a promising route of low cost and high *** electrochemical reduction of HCO_(3)^(-)is challenging due to the inaccessible of negatively charged molecular groups to the electrode ***,we adopt a comprehensive strategy to tackle this challenge,i.e.,cascade of in situ chemical conversion of HCO_(3)^(-)to CO_(2) and CO_(2) electrochemical reduction in a flow *** a tailored Ni-N-S single atom catalyst(SACs),where sulfur(S)atoms located in the second shell of Ni center,the CO_(2)electroreduction(CO_(2)ER)to CO is *** experimental results and density functional theory(DFT)calculations reveal that the introduction of S increases the p electron density of N atoms near Ni atom,thereby stabilizing^(*)H over N and boosting the first proton coupled electron transfer process of CO_(2)ER,i.e.,^(*)+e^(-)+^(*)H+^(*)CO_(2)→^(*)*** a result,the obtained catalyst exhibits a high faradaic efficiency(FE_(CO)~98%)and a low overpotential of 425 mV for CO production as well as a superior turnover frequency(TOF)of 47397 h^(-1),outcompeting most of the reported Ni *** importantly,an extremely high FECOof 90%is achieved at 50 mA cm^(-2)in the designed membrane electrode assembly(MEA)cascade electrolyzer fed with liquid *** work not only highlights the significant role of the second coordination on the first coordination shell of the central metal for CO_(2)ER,but also provides an alternative and feasible strategy to realize the electrochemical conversion of HCO_(3)^(-)to high-value chemicals.

关键词： S doped Ni-N-C single atom catalysts CO_(2)electrochemical reduction DFT calculations Membrane electrode assembly Reduction of bicarbonate

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Probing the interlayer mechanical coupling of 2D layered materials-A review

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Progress in Natural Science:materials International 2022年第5期32卷 528-537页

作者： Yinghui Sun Yufei Sun Rongming Wang Kai Liu Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science School of Mathematics and Physics University of Science and Technology Beijing State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and Engineering Tsinghua University

Two-dimensional(2D) layered materials are assembled through the intralayer covalent bonds and interlayer van der Waals(vdWs) interactions. The relatively weak interlayer vdWs interactions result in the weak interlayer mechanical coupling between layers, which strongly impacts the overall mechanical properties of multilayer 2D materials or heterostructures. Experimentally probing the interlayer mechanical coupling is of vital importance on the accumulation of fundamental parameters for their applications in flexible and stretchable devices, yet there are hardly comprehensive reviews in this research field. In this review, we firstly introduce the probing methods of interlayer mechanical coupling, including high-frequency and ultralow-frequency Raman characterizations,nanoindentation of multilayer 2D materials or heterostructures, surface indentation, pressurized blister test,characterization of spontaneously formed nanoblisters, and nano-friction tests. Based on the analysis and comparison of the existing methods and results, we also discuss the advantages and limitations of each ***, the challenges and opportunities in this promising field are discussed. This review summarizes the recent progress in the probing of interlayer mechanical coupling of 2D layered materials and will provide important reference for the rational design of flexible and stretchable devices.

关键词： van der Waals interaction Mechanical properties Indentation Heterostructures

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Tuning Structural and Electronic Configuration of FeN_(4) via External S for Enhanced Oxygen Reduction Reaction

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Energy & Environmental materials 2024年第2期7卷 93-101页

作者： Shidong Li Lixue Xia Jiantao Li Zhuo Chen Wei Zhang Jiexin Zhu Ruohan Yu Fang Liu Sungsik Lee Yan Zhao Liang Zhou Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528200China Chemical Sciences and Engineering Division Argonne National Laboratory9700 South Cass AvenueLemontIL 60439USA NRC(Nanostructure Research Centre) Wuhan University of TechnologyWuhan 430070China X-ray Science Division Advanced Photon SourcesArgonne National Laboratory9700 South CassAvenueLemontIL 60439USA State Key Laboratory of Silicate Materials for Architectures International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China The Institute of Technological Sciences Wuhan UniversityWuhan 430072China Hubei Longzhong Laboratory Xiangyang 441000China

The Fe-N-C material represents an attractive oxygen reduction reaction electrocatalyst,and the FeN_(4)moiety has been identified as a very competitive catalytic active *** tuning of the coordination structure of FeN_(4)has an essential impact on the catalytic ***,we construct a sulfur-modified Fe-N-C catalyst with controllable local coordination environment,where the Fe is coordinated with four in-plane N and an axial external *** external S atom affects not only the electron distribution but also the spin state of Fe in the FeN_(4)active *** appearance of higher valence states and spin states for Fe demonstrates the increase in unpaired *** the above characteristics,the adsorption and desorption of the reactants at FeN_(4)active sites are optimized,thus promoting the oxygen reduction reaction *** work explores the key point in electronic configuration and coordination environment tuning of FeN_(4)through S doping and provides new insight into the construction of M-N-C-based oxygen reduction reaction catalysts.

关键词： coordination structure electronic configuration FeN_(4)moiety oxygen reduction reaction sulfur doping

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One-step fabrication of ultrathin porous Janus membrane within seconds for waterproof and breathable electronic skin

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Science Bulletin 2025年第5期70卷 712-721页

作者： Yufeng Ni Bing Li Chengzhen Chu Shaofan Wang Yujie Jia Shichun Cao Rasoul Esmaeely Neisiany Chuanglong He Shuo Chen Zhengwei You State Key Laboratory of Advanced Fiber Materials Institute of Functional MaterialsCollege of Materials Science and EngineeringResearch Base of Textile Materials for Flexible Electronics and Biomedical Applications(China Textile Engineering Society)Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative MedicineShanghai Key Laboratory of Lightweight CompositeDonghua UniversityShanghai 201620China College of Biological Science and Medical Engineering Donghua UniversityShanghai 201620China Department of Materials and Polymer Engineering Faculty of EngineeringHakim Sabzevari UniversitySabzevar***Iran Biotechnology Centre Silesian University of TechnologyGliwice44-100Poland

It remains a challenge for a simple and scalable method to fabricate ultrathin porous Janus membranes for stretchable on-skin ***,we propose a one-step droplet spreading phase separation strategy to prepare an ultrathin and easily collected Janus thermoplastic polyurethane(TPU)membrane within *** metal-ion solvation structure mitigated migration kinetics to delay TPU solution demixing,promoting the further penetration of the coagulating ***,the developed membranes,with an average preparation rate of 25.2 cm^(2)s^(−1),had a thickness of 5μm,and the water vapor transmission rate was determined to be 663 g m^(−2) d^(−1).The small pore layer having an average pore size of 1.7μm effectively blocked external liquid *** porous Janus TPU membrane coated by liquid metal served as a building block to develop a new generation of monolithic stretchable electronics with simultaneous high permeability and waterproofness.

关键词： porous polyurethane kinetics

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Revealing effects of powder reuse for LPBF-fabricated NiTi shape memory alloys

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Frontiers of materials Science 2024年第4期18卷 191-201页

作者： Xiang Li Meng Zhou Sihui Peng Xiaonan Chen Xueyuan Ge Bingmin Huang Lishan Cui Shijie Hao College of New Energy and Materials China University of PetroleumBeijing 102249China State Key Laboratory of Advanced Forming Technology and Equipment China Machinery Institute of Advanced Materials Co.Ltd.Zhengzhou 450001China Jiangsu Smart Advanced Material Technology Co. Ltd.Xuzhou 221000China

In metal-based additive manufacturing processes,such as laser powder bed fusion(LPBF),the powder utilization is often less than 50%.Considering the cost efficiency,powder reuse is needed for an economical and sustainable LPBF *** intermetallic compounds,LPBF-fabricated NiTi alloys are characterized with phase transformation behaviors,mechanical properties and functions that are very sensitive to possible changes in powder characteristics caused through reuse,but the exact effects are still poorly ***,the LPBF process has been repeated ten times using the virgin powder supplement *** show that the oxygen content of NiTi powders rises from 370 to 752.3 ppm with the enhancement of the reuse cycle *** oxidation enhances the laser absorptivity of the powder bed,leading to an increase in surface roughness and porosity of NiTi *** to the specimens made from virgin powders,the mechanical property and shape memory function of specimens made from reused powders are degraded,mainly attributed to the oxygen impurity and deteriorated forming *** study allows making better decisions with regard to powder reuse in the development of performance-critical NiTi parts fabricated through LPBF.

关键词： laser powder bed fusion NiTi shape memory alloy powder reuse microstructure mechanical property

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