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Carbon nanotube films with ultrahigh thermal-shock and thermalshock-fatigue resistance characterized by ultra-fast ascending shock testing

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Nano Research 2024年第8期17卷 6777-6784页

作者： Mingquan Zhu Shijun Wang Yunxiang Bai Feng Gao Zhenxing Zhu Congying Wang Peng Zhang Hao Jin Hui Zhang Luqi Liu Zhiping Xu Xinghong Zhang Fei Wei Zhong Zhang CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150001China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China

The exploration of material failure behavior not only involves defining its limits and underlying mechanisms but also entails devising strategies for improvement and protection in extreme ***'ve pioneered an advanced multi-scale,high-speed ascending thermal shock testing platform capable of inducing unprecedented heat shocks at rates surpassing 105℃/*** meticulous examination of the thermal shock responses of carbon nanotube(CNT)films,we've achieved remarkable *** employing an innovative macro-scale synchronous tightening and relaxing approach,we've attained a critical temperature differential in CNT films that exceeds an exceptional 2500℃—surpassing any previously reported metric for highperformance,thermal-shock-resistant ***,these samples have demonstrated exceptional resilience,retaining virtually unchanged strength even after enduring 10,000 thermal shock cycles at temperatures exceeding 1000℃.Furthermore,our research has revealed a novel thermal shock/fatigue failure mechanism that fundamentally diverges from conventional theories centered on thermal stress.

关键词： carbon nanotubes failure behavior thermal shock characterization

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Modification strategies for non-aqueous, highly proton-conductive benzimidazole-based high-temperature proton exchange membranes

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Chinese Chemical Letters 2024年第4期35卷 43-51页

作者： Yunfa Dong Shijie Zhong Yuhui He Zhezhi Liu Shengyu Zhou Qun Li Yashuai Pang Haodong Xie Yuanpeng Ji Yuanpeng Liu Jiecai Han Weidong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China School of Petroleum Engineering Chongqing University of Science and TechnologyChongqing 401331China School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China 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

High-temperature proton exchange membranes(HT-PEMs) possess excellent thermal and outstanding electrochemical stability, providing an avenue to realize high-temperature proton exchange membranes fuel cells(HT-PEMFCs) with both superior power density and long-term durability. Unfortunately, polybenzimidazole(PBI), a typical material for conventional HT-PEMs, fails to compromise the high nonaqueous proton conductivity and high mechanical properties, thus hindering their practical *** efficient nonaqueous proton conduction is crucial for HT-PEMFC, and many insightful research works have been done in this area. However, there still lacks a report that integrates the host-guest interactions of phosphoric acid doping and the structural stability of polymers to systematically illustrate modification strategies. Here, we summarize recent advancements in enhancing the nonaqueous proton conduction of HT-PEMs. Various polymer structure modification strategies, including main chain and side group modification, cross-linking, blocking, and branching, are reviewed. Composite approaches of polymer, including compounding with organic porous polymers, filling the inorganic components and modifying with ionic liquids, etc., are also covered in this work. These strategies endow the HT-PEMs with more free volume, nanophase-separated structure, and multi-stage proton transfer channels, which can facilitate the proton transportation and improve their performance. Finally, current challenges and future directions for further enhancements are also outlined.

关键词： Benzimidazole Nonaqueous proton conduction Free volume Nanophase-separated structure Structure modification

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Anisotropic Damage Evolution in Solid Fractures: A Novel Phase Field Approach with Multiple Failure Criteria and Directional-Dependent Structural Tensor

SSRN

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SSRN 2024年

作者： Zou, Xiaocan Xu, Zhonghai Li, Wenjie Gao, Jin Hu, Chunxing Li, Ruoyu He, Xiaodong National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China

This study proposes a novel phase field fracture model based on unified phase field theory, aiming to overcome current limitations in simulating material complex fracture behaviors. Through this model, analytical solutions for two-dimensional bars subjected to tensile or compressive stresses are provided, enabling the coupling of multiple failure criteria and further proficient simulation of mode I, mode II, and mixed mode I/II fractures, effectively addressing challenges faced in modelling materials with different or complex failure modes under various loading conditions. Furthermore, to account for the strong anisotropic failure behavior of materials, a novel directional-dependent structural tensor is proposed. The tensor correlates fracture energy with crack surface orientation, facilitating precise characterization of material damage evolution with multiple potential crack orientations. This tensor ensures the consistency of phase field fracture evolution with predefined fracture patterns. The effectiveness of the proposed model is validated through case studies, emphasizing its robustness and superior predictive capability in capturing fracture behavior under various conditions. This research provides a more accurate and universally applicable approach for simulating material failure, particularly for complex or multiple failure mode material failure simulations. © 2024, The Authors. All rights reserved.

关键词： Fracture

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Research on High Temperature Mechanical Behavior of Carbon/Phenolic composites Under Ultra-High Heating Rates

SSRN

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SSRN 2024年

作者： Lin, Xiaochu Yi, Fajun Xie, Weihua Xu, Chenghai Meng, Songhe National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150006 China

Fiber reinforced resin matrix composites have excellent resistance to ablation, thermal insulation, and mechanical properties at high temperatures, so it is widely used in aerospace engineering. Needle punched reinforced carbon/phenolic composites is the most commonly used structural material for solid rocket engine nozzles. However, during the working process of the engine, the mechanical behavior under ultra-high heating rates is difficult to characterize due to the extreme loads. Therefore, in this study, specimens were carbonized before testing, and an electric heating testing machine was used combined with an infrared thermal imager and digital image correlation (DIC) system to characterize the mechanical behavior of carbon/phenolic at ultra-high heating rates. The results indicate that at a heating rate of 200 °C/s, the compressive modulus increases linearly with temperature, and reaching 63.1 GPa at 1400 °C. The maximum compressive strength is 61.9 MPa at 1400 °C, and the minimum is 27.4 MPa at 600 °C. Referring to the high-temperature damage constitutive model, a pyrolysis damage-high temperature strengthening constitutive model was constructed, and the in-plane compression mechanical behavior of carbon/phenolic composites was accurately described. © 2024, The Authors. All rights reserved.

关键词： Reinforcement

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Multifunctional diamond-based catalysts:Promising candidates for energy conversions in extreme environments-A mini-review

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Electron 2024年第3期2卷 70-84页

作者： Ziwei Zhao Xiaowu Gao Hansong Zhang Keran Jiao Pengfei Song Yumin Zhang Yongjie Wang Jiaqi Zhu Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Shenzhen Key Laboratory of Advanced Functional Carbon Materials Research and Comprehensive ApplicationHarbin Institute of TechnologyShenzhenChina National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinChina Department of Chemical Engineering The University of ManchesterManchesterUK School of Advanced Technology Xi'an Jiaotong-Liverpool UniversitySuzhouChina Zhengzhou Research Institute Harbin Institute of TechnologyZhengzhouChina

In order to properly utilize the abundant CO_(2)and water resources,various catalytic materials have been developed to convert them into valuable chemicals as renewable fuels electrochemically or ***,most studies are conducted under mild laboratory conditions,but for some extreme environments,such as Mars and space stations,there is an urgent need to develop new catalysts satisfying such special *** catalytic materials mainly focus on metals and narrow bandgap semiconductor materials,while the research on wide and ultrawide bandgap materials that can inherently withstand extreme conditions has not received enough *** the robust stability and excellent physico-chemical properties of diamond,it can be expected to perform in harsh environments for electrocatalysis or photocatalysis that has not been investigated ***,this review summarizes the catalytic functionality of diamond-based electrodes with various but tunable product selectivity to obtain the varied C_(1)or C_(2+)products,and discusses some important factors playing a key role in manipulating the catalytic ***,the unique solvation electron effect of diamond gives it a significant advantage in photocatalytic conversions which is also summarized in this *** the end,prospects are made for the application of diamond-based catalysts under various extreme *** challenges that may be faced in practical applications are also summarized and future breakthrough directions are proposed at the end.

关键词： CO_(2)catalytic reduction diamond extreme environment functionality renewable energy

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Nanodiamond:a promising metal-free nanoscale material in photocatalysis and electrocatalysis

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Rare Metals 2024年第8期43卷 3501-3552页

作者： Xiao-Wu Gao Zi-Wei Zhao Yang He Sai-Fei Fan Ke-Ran Jiao Si-Yu Lou Xin-Yue Han Peng-Fei Song Rong Cai Zhun Hu Zhong-Jie Jiang Yong-Jie Wang Jia-Qi Zhu Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems School of ScienceHarbin Institute of TechnologyShenzhen 518055China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China School of Advanced Technology Xi'an Jiaotong-Liverpool UniversitySuzhou215000China Department of Biosciences Rice UniversityHoustonTX 77251USA Institute of Industrial Catalysis School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi'an 710049China Guangzhou Key Laboratory for Surface Chemistry of Energy Materials New Energy Research Institute&Guangdong Engineering and Technology Research Center for Surface Chemistry of Energy MaterialsCollege of Environment and EnergySouth China University of TechnologyGuangzhou 510006China

Benefiting from its surface-rich functional groups,eco-friendliness,impressive electrochemical properties,excellent light absorption,structural tunability at the atomic/morphological level,and ultra-high stability under harsh conditions,nanodiamond has emerged as a promising carbon-based non-metallic material in the field of energy conversion such as electrocatalysis and ***,nanodiamond,as a new generation of green catalysts,can overcome the poisoning of catalysts by complex pollutants in advanced oxidation processes,thus effectively removing organic matter from water,which is unparalleled in reducing the cost of water purification and avoiding secondary cross-contamination of water by traditional heavy metal-based ***,we review the research and development of nanodiamonds as major electrocatalysts and photocatalysts for energy conversion and for air/water treatment for environmental *** relevant properties,trimming strategy,mechanistic understanding,and design principles of nanodiamond as a catalyst are described,as well as the challenges and prospects of this emerging field.

关键词： Carbon materials Nanodiamond Electrocatalysis Photocatalysis Energy conversion Pollutant treatment

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Using PyC modified 3D carbon fiber to reinforce UHTC under low temperature sintering without pressure

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Journal of advanced Ceramics 2021年第4期10卷 871-884页

作者： Baihe DU Yuan CHENG Liancai XUN Shuchang ZHANG Jing TONG Qingrong LV Shanbao ZHOU Ping HU Xinghong ZHANG National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150001China School of Physics and Material Science Anhui UniversityHefei 230601China

Finding the optimum balance between strength and toughness,as well as acquiring reliable thermal shock resistance and oxidation resistance,has always been the most concerned topic in the discussion of ultra-high temperature ceramic ***,PyC modified 3D carbon fiber is used to reinforce ultra-high temperature ceramic(UHTC).The macroscopic block composite with large size is successfully fabricated through low temperature sintering at 1300℃without *** prepared PyC modified 3D C_(f)/ZrC-SiC composites simultaneously possess excellent physical and chemical stability under the synergistic effect of PyC interface layer and low temperature 1/2 sintering without *** fracture toughness is increased in magnitude to 13.05±1.72 MPa·m^(1/2)accompanied by reliable flexural strength of 251±27 *** rapid thermal shock spanning from room temperature(RT)to 1200℃,there are no visible surface penetrating cracks,spalling,or structural *** maximum critical temperature difference reaches 875℃,which is nearly three times higher than that of traditional monolithic *** haunting puzzle of intrinsic brittleness and low damage tolerance are resolved *** the protection of PyC interface layer,the carbon fibers around oxide layer and matrix remain structure intact after static oxidation at 1500℃for 30 *** oxide layer has reliable physical and chemical stability and resists the erosion from fierce oxidizing atmosphere,ensuring the excellent oxidation resistance of the *** a sense,the present work provides promising universality in designability and achievement of 3D carbon fiber reinforced ceramic composites.

关键词： ultra-high temperature ceramic(UHTC) pyrolytic carbon interface layer carbon fiber

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When physics meets chemistry at dynamic glass transition

arXiv

引用

arXiv 2023年

作者： Lu, Haibao Science and Technology on Advanced Composites in Special Environments Laboratory Harbin Institute of Technology Harbin150080 China

Can the laws of physics be unified. One of the most puzzling challenges is to reconcile physics and chemistry, where molecular physics meets condensed-matter physics, resulting from the scaling effect and dynamic fluctuation of glassy matter at the glass transition temperature. Pioneer of condensed-matter physics, the Nobel Prize-winning physicist Philip Warren Anderson, wrote in 1995: The deepest and most interesting unsolved problem in condensed-matter physics is probably the theory of the nature of glassy state and the glass transition. In 2005, the question of 'what is the nature of glassy state' was suggested as one of the greatest scientific conundrums over the next quarter-century for science's 125th anniversary. However, the nature of glassy state and its connection to the glass transition have not been fully understood owing to the interdisciplinary complexity of physics and chemistry, where they are governed by the physical laws at condensed-matter and molecular scales, respectively. Therefore, study on the glass transition becomes essential to explore the working principles of scaling effect and dynamic fluctuation in glassy matter, as well as further reconcile the interdisciplinary complexity of physics and chemistry. © 2023, CC BY.

关键词： Glass transition

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Compositional design and phase formation capability of high-entropy rare-earth disilicates from machine learning and decision fusion

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npj Computational Materials 2024年第1期10卷 2257-2271页

作者： Yun Fan Yuelei Bai Qian Li Zhiyao Lu Dong Chen Yuchen Liu Wenxian Li Bin Liu National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and Structure Harbin Institute of TechnologyHarbin 150080China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China National Engineering Research Center for Magnesium Alloy Chongqing UniversityChongqing 400044China School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150080China UNSW Materials&Manufacturing Futures Institute School of Materials Science and EngineeringUniversity of New South WalesSydney NSW 2052Australia Institute of Coating Technology for Hydrogen Gas Turbines Liaoning Academy of MaterialsShenyang 110004China

A key strategy for designing environmental barrier coatings is to incorporate multiple rare-earth(RE)components intoβ-andγ-RE_(2)Si_(2)O_(7)to achieve multifunctional performance ***,the polymorphic phase presents s... 详细信息

关键词： rare earth silicate

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A Topological Entanglement Model for Metastable Water Undergoing Liquid-Liquid Phase Transition

SSRN

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SSRN 2023年

作者： Li, Peizhao Lu, Haibao Science and Technology on Advanced Composites in Special Environments Laboratory Harbin Institute of Technology Harbin150080 China

Due to the coexistence of two distinct states, namely low-density liquid (LDL) and high-density liquid (HDL), water has a unique liquid-liquid phase transition (LLPT) behavior. However, the underlying mechanism for LLPT is not well understood owing to the complex entanglements of the condensed structures. This study proposes a new topological entanglement model to characterize the LLPTs of LDL and HDL in the metastable water and describe the condensed structures utilizing theoretical models of topological unlink, entanglement and sub-entanglement of the condensed structures. Topological unlinks and topological entangled Hopf links are firstly used to describe the topological nature of the LDL and HDL. Meanwhile, the sub-entanglement is employed to describe the dynamic inter-molecular interactions between LDL and HDL. This model is further extended to establish constitutive relationships among abnormal properties. Finally, effectiveness of the proposed model is verified by molecular dynamics simulations and experimental data reported in literature. © 2023, The Authors. All rights reserved.

关键词： Molecular dynamics

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