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Pressure-induced emission in 0D metal halide(EATMP)SbBr5 by regulating exciton-phonon coupling

Chinese Journal of Structural Chemistry 2024年第7期43卷 47-53页

作者： Jiayuan Liang Xin Mi Songhao Guo Hui Luo Kejun Bu Tonghuan Fu Menglin Duan Yang Wang Qingyang Hu Rengen Xiong Peng Qin Fuqiang Huang Xujie Lü Center for High Pressure Science and Technology Advanced Research(HPSTAR) Shanghai201203China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Center of Micro-Nano System School of Information Science and TechnologyFudan UniversityShanghai200433China Ordered Matter Science Research Center Nanchang UniversityNanchang330031China State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityDongchuan Road 800Shanghai200240China Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments(MFree) Shanghai Advanced Research in Physical Sciences(SHARPS)PudongShanghai201203China

Zero-dimensional(0D)hybrid metal halides are considered as promising light-emitting materials due to their unique broadband emission from self-trapped excitons(STEs).Despite substantial progress in the development of these materials,the photoluminescence quantum yields(PLQY)of hybrid Sb-Br analogs have not fully realized the ca-pabilities of these materials,necessitating a better fundamental understanding of the structure-property ***,we have achieved a pressure-induced emission in 0D(EATMP)SbBr5(EATMP=(2-aminoethyl)trimethylphosphanium)and the underlying mechanisms are investigated using in situ experimental characterization and first-principles *** pressure-induced reduction in the overlap between the STE states and ground states(GSs)results in the suppression of phonon-assisted non-radiative *** photoluminescence(PL)evo-lution is systematically demonstrated to be controlled by the pressure-regulated exciton-phonon coupling,which can be quantified using Huang-Rhys *** detailed studies of the S-PLQY relation in a series of 0D hybrid antimony halides,we establish a quantitative structure-property relationship that regulating S value toward 21 leads to the optimized *** work not only sheds light on pressure-induced emission in 0D hybrid metal halides but also provides valuable insights into the design principles for enhancing the PLQY in this class of materials.

关键词： 0D hybrid metal halides Pressure-induced emission Structure-property relationship Huang-Rhys factor Exciton-phonon coupling

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Phase equilibria of long-period stacking ordered phase in the ternary Mg-Y-Al alloys

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Journal of Materials science & technology 2022年第31期126卷 80-92页

作者： Yiwen Chen Quan Li Yangxin Li Weisen Zheng Jingya Wang Xiaoqin Zeng National Engineering Research Center of Light Alloy Net Forming Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Advanced Special Steels School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

Phase equilibria focusing on the long-period stacking ordered(LPSO)phases have been experimentally in-vestigated in the Mg-Y-Al *** microstructures of the eleven representative alloys annealed at 450,500 and 550°C were systematically investigated using X-ray diffraction(XRD),scanning electron mi-croscopy(SEM)and transmission electron microscopy(TEM).Two thermodynamically stable LPSO poly-types were identified,including 18R and 10H ***,the transformation of 18R→10H was detected in Mg-9.0Y-1.7Al(at.%)alloy,while the coexistence of 18R and 10H was observed in Mg-14.2Y-12.8Al(at.%)*** was found that the LPSO phases were non-stoichiometric compounds with ternary *** 18R can dissolve up to 7.21 at.%-8.37 at.%Al and 10.75 at.%-12.01 at.%Y,while the 10H can dissolve up to 9.35 at.%-10.37 at.%Al and 14.50 at.%-14.94 at.%*** of the experimental re-sults were used to construct the isothermal sections,which is conducive to the design of Mg-Y-Al alloys.

关键词： Mg-Y-Al alloys LPSO phases Phase relationships Isothermal sections Atomic structure

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Carbon Fiber Composite Honeycomb Structures and the Application for Satellite Antenna Reflector with High Precision

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Advances in Astronautics science and technology 2022年第4期5卷 423-441页

作者： Wei, Xingyu Wang, Yan Xue, Pengcheng Zhang, Taotao Rouis, Abir Xiao, Wei Xiong, Jian Center for Composite Materials and Structures Harbin Institute of Technology Harbin 150001 China National Key Laboratory of Science and Technology On Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 China Beijing Institute of Spacecraft System Engineering Beijing 10000 China

This article summarizes the composite honeycomb structure which possess important meaning and application value on the high-precision satellite antenna reflector. The key technologies of composite material honeycomb structure are summarized, including the material selection for satellite antenna reflector, honeycomb configuration, fabrication process, mechanical properties, lightweight design, surface accuracy, thermal deformation control and other issues. The development goal of “lighter, larger, more refined and more stable” are put forward after looking forward to the manufacturing technology and functional requirement of the future satellite antenna reflector. © 2022, Chinese Society of Astronautics.

关键词： Composite honeycomb material Fabrication method Mechanical property Sandwich structure Satellite antenna reflector

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Ablation-Cooling Effect During Nanosecond Laser Precision Machining of Cfrp

SSRN

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SSRN 2024年

作者： Chen, Guanglei Ye, Yunxia Hong, Ziqin Yuan, Zhao Ren, Xudong Shi, Liping School of Mechanical Engineering Jiangsu University Zhenjiang212013 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150006 China

Heat-affected zone (HAZ) in laser machining of carbon fiber reinforced plastic (CFRP) is an important factor affecting the assembly and service performance of CFRP. The ablation-cooling effect induced by nanosecond laser can be used to control HAZ of CFRP and improve the machining efficiency simultaneously. In this paper, the influence of key parameters such as peak power density, pulse width and repetition frequency on the formation mechanism of HAZ and the conditions for ablation-cooling are studied based on simulation and experiment. The simulation results show that ablation-cooling is more likely to occur at the high peak power density and high repetition frequency. The pulse width affects the width of HAZ through the ablation mechanism. The experimental results show that when the peak power density is greater than 108 W/cm2, the ablation-cooling effect effectively reduces HAZ and increases the removal amount, which is consistent with the simulation law. © 2024, The Authors. All rights reserved.

关键词： Carbon fiber reinforced plastics

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Electromagnetic Functions Modulation of Recycled By-Products by Heterodimensional Structure

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Nano-Micro Letters 2025年第6期17卷 264-278页

作者： Ze Nan Wei Wei Zhenhua Lin Ruimei Yuan Miao Zhang Jincheng Zhang Jianyong Ouyang Jingjing Chang Hejun Li Yue Hao State Key Laboratory of Wide-Bandgap Semiconductor Devices and Integrated Technology School of MicroelectronicsXidian UniversityXi’an 710071People’s Republic of China State Key Laboratory of Solidification Processing Shaanxi Province Key Laboratory of Fiber Reinforced Light Composite MaterialsCarbon/Carbon Composites Research CenterNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China Advanced Interdisciplinary Research Center for Flexible Electronics Xidian UniversityXi’an 710071People’s Republic of China Department of Materials Science and Engineering National University of Singapore7 Engineering Drive 1Singapore 117574Singapore

One of the significant technological challenges in safeguarding electronic devices pertains to the modulation of electromagnetic(EM)wave jamming and the recycling of defensive *** synergistic effect of heterodimensional materials can effectively enable the manipulation of EM waves by altering the *** we propose a novel approach for upcycling by-products of silver nanowires that can fabricate shape-tunable aerogels which enable the modulation of its interaction with microwaves by heterodimensional structure of ***-product heterodimensionality was used to design EM-wave-jamming-dissipation structures and therefore two typical tunable aerogel forms were *** first tunable form was aerogel film,which shielded EM interference(EMI shielding effectiveness(EMI SE)>89 dB)and the second tunable form was foam,which performed dual EM functions(SE>30 dB&reflective loss(RL)<-35 dB,effective absorption bandwidth(EAB)>6.7 GHz).We show that secondary recycled aerogels retain nearly all of their EM protection properties,making this type of closed-loop cycle an appealing *** findings pave the way for the development of adaptive EM functions with nanoscale regulation in a green and closed-loop cycle,and they shed light on the fundamental understanding of microwave interactions with heterodimensional structures.

关键词： Silver nanowires Electromagnetic shielding Microwave absorption Recycled aerogels

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Inversion of Spatially Distributed Elastic Moduli of 2.5d Woven composites Based on Dic Strain Field Using Pinn Method

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SSRN 2024年

作者： Wang, Hongyue Fang, Guodong Gao, Bo Wang, Bing Meng, Songhe Center for Composite Materials and Structures Harbin Institute of Technology Harbin150001 China Science and Technology on Advanced Composites in Special Environments Key Laboratory Harbin Institute of Technology Harbin150001 China

Due to the stochastic geometries from micro-scale to meso-scale, the elastic modulus of fiber reinforced ceramic matrix woven composites exhibits significant spatial variabilities, as evidenced by the surface strain distribution captured through Digital Image Correlation method. These spatial variabilities, resulting in significant heterogeneous material properties, are of essential importance in both engineering and material science. Inspired by the excellent performances of Physics-Informed Neural Networks (PINNs), a data-driven method integrating invariant-based theory based on iteration strategy is proposed to identify the non-homogeneous modulus field of 2.5D SiO2f/SiO2 composites inversely. The constitutive equation has been normalized by the Tsai’s modulus, effectively alleviating the ill-posed nature of the problem. Furthermore, the results of PINNs show a high prediction accuracy, which have been validated through virtual testing and experimental tensile tests. The method proposed in this paper provides a powerful approach for inversely identifying the spatial variabilities of orthotropic composite material properties, which also holds potential for applications such as high-throughput non-destructive evaluation techniques. © 2024, The Authors. All rights reserved.

关键词： Elastic moduli

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Regulation Strategy of Transition Metal Oxide-Based Electrocatalysts for Enhanced Oxygen Evolution Reaction

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Accounts of Materials Research 2022年第10期3卷 1088-1100页

作者： Yuanyuan Zhang Qiang Fu Bo Song Ping Xu MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China School of Physics Harbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China

CONSPECTUS:The deployment of hydrogen as alternative energy carrier is a promising route to reduce the consumption of fossil fuel and achieve the“zero carbon”*** electrolysis,powered by renewable energy sources,is regarded as the most environmentally friendly and efficient technology for hydrogen ***,the sluggish oxygen evolution reaction(OER)process at the anode predominantly limits the efficiency of water electrolysis.

关键词： Transition Oxygen hydrogen

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Stabilizing High-Nickel Cathodes via Interfacial Hydrogen Bonding Effects Using a Hydrofluoric Acid-Scavenging Separator

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Engineering 2024年第8期39卷 117-126页

作者： Shijie Zhong Liwei Dong Botao Yuan Yueyao Dong Qun Li Yuanpeng Ji Yuanpeng Liu Jiecai Han Weidong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments &Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China Chongqing Research Institute Harbin Institute of TechnologyChongqing 401151China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

Nickel-rich layered Li transition metal oxides are the most promising cathode materials for high-energydensity Li-ion ***,they exhibit rapid capacity degradation induced by transition metal dissolution and structural reconstruction,which are associated with hydrofluoric acid(HF)generation from lithium hexafluorophosphate *** potential for thermal runaway during the working process poses another *** are promising components to alleviate the aforementioned ***,an ultrathin double-layered separator with a 10 lm polyimide(PI)basement and a 2 lm polyvinylidene difluoride(PVDF)coating layer is designed and fabricated by combining a nonsolvent induced phase inversion process and coating *** PI skeleton provides good stability against potential thermal shrinkage,and the strong PI-PVDF bonding endows the composite separator with robust structural integrity;these characteristics jointly contribute to the extraordinary mechanical tolerance of the separator at elevated ***,unique HF-scavenging effects are achieved with the formation of-CO…H-F hydrogen bonds for the abundant HF coordination sites provided by the imide ring;hence,the layered Ni-rich cathodes are protected from HF attack,which ultimately reduces transition metal dissolution and facilitates long-term cyclability of the Ni-rich ***||NCM811 batteries(where“NCM”indicates LiNi_(x)Co_(y)Mn_(1-x-y)O_(2))with the proposed composite separator exhibit a 90.6%capacity retention after 400 cycles at room temperature and remain sustainable at 60℃with a 91.4%capacity retention after 200 *** adopting a new perspective on separators,this study presents a feasible and promising strategy for suppressing capacity degradation and enabling the safe operation of Ni-rich cathode materials.

关键词： Nickel-rich cathodes Composite separator HF scavenging Transition metal dissolution Long-term cyclability

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Low Temperature Sintering of High Performance Al2O3/ZrO2 Nanocomposite Ceramics

SSRN

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SSRN 2023年

作者： Liu, Xudong Yuan, Yuchen Wang, Renjie Zhu, Shiyang Bai, Yuelei Fang, Canqing Chen, Ce Zheng, Yongting National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Centre for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China

In this work, amorphous/solid solution Al2O3/ZrO2 powder was prepared by combustion synthesis assisted with rapid cooling in water, followed by grinding for further refinement. The solubility of Al2O3 in the ZrO2 lattice was greatly enhanced by the rapid cooling process in water. The transformation of the metastable state and the presence of oxygen vacancies in the powder can accelerate the mass transfer during sintering, allowing for the preparation of nearly fully densified ceramics through hot press sintering at temperatures as low as 1300°C. During sintering, large numbers of ultra-fine nanoparticles (~5 nm) were precipitated from the solid solution and evenly dispersed throughout the matrix. The nanoparticles exhibit a high degree of coherence with the matrix due to the similarities in crystal structure between t-ZrO2 and α-Al2O3. The nanoparticle reinforcement effect and t-m phase transformation of ZrO2 both contributed to the ceramics' excellent mechanical properties. To compare the sintering capabilities and the performance of the ceramics, commercial powders were also sintered at the same temperature. This research may offer a new instruction for the low temperature fabrication of nanoparticles-strengthened ceramics. © 2023, The Authors. All rights reserved.

关键词： Solid solutions

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Precipitation mechanism and microstructural evolution of Al2O3/ZrO2(CeO2) solid solution powders consolidated by spark plasma sintering

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Journal of Materials science & technology 2020年第6期41卷 149-158页

作者： Wanjun Yu Yongting Zheng Yongdong Yu National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and Structures Harbin Institute of TechnologyHarbin 150080China

It is difficult to synthesize Al2O3/ZrO2 solid solution because of its low solubility under equilibrium solidification *** this work,a new combustion synthesis combined with water atomization(CS-WA)method was developed to prepare supersaturated Al2O3/ZrO2(CeO2)solid solution *** ultrahigh cooling rate supplied by CS-WA greatly extends solid solubility of Al2O3 in *** precipitation mechanism of solid solution was investigated by systematic heat *** initial temperature of the metastable phase decomposed into Al2O3 and ZrO2 is 1050℃,and it could be completely precipitated at 1400℃in 0.5 *** precipitated ZrO2 particles were uniformly dispersed in Al2O3 matrix and grew into submicron scale at annealing temperature of 1450℃.Subsequently,together with detailed microstructure,phase composition,as well as mechanical properties were collaboratively outlined to discuss spark plasma sintering(SPS)*** solid solution precipitated Al2O3 matrix and ZrO2 particles during the SPS *** ZrO2 particles were uniformly distributed within Al2O3 matrix,while the residuary ZrO2 located at the grain boundaries and formed special transgranular/intergranular *** average size of nanoscale transgranular ZrO2 particles was only^11.5 *** compact ZrO2 toughened Al2O3 nano ceramic(N-ZTA)exhibits excellent mechanical *** work provides a guidance to produce nanostructured ZTA with high performance.

关键词： Solid solution Precipitation Spark plasma sintering ZTA Transgranular/intergranular structure

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