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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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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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Au nanospheres modified boron-doped diamond microelectrode grown via hydrogen plasma etching solid doping source for dopamine detection

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Journal of Materials science & technology 2020年第14期47卷 42-46页

作者： Kaili Yao Xiaojun Tan Bing Dai Jie Bai Qiaoyang Sun Wenxin Cao Jiwen Zhao Lei Yang Jiecai Han Jiaqi Zhu National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin150080China

Boron doped diamond(BDD)electrode is a promising electrochemical material for detecting dopamine level in the human’s *** this work,we developed a new doping source-graphite and solid boron oxide powders to synthesize BDD film with microwave plasma chemical vapor deposition,so as to avoid using toxic or corrosive dopants,such as boroethane and *** synthesized BDD film is pinhole free and with high doping density of 8.44×10^20 cm^-3 calculated from the Raman ***,Au nanospheres were decorated on the surface of BDD film to improve electrochemical performance of the BDD *** Au nanoparticles modified BDD electrode demonstrates an excellent electrochemical response,a high sensitivity(in the range of 5μM-1 m M),and a low detection limit(~0.8μM)for detecting dopamine.

关键词： Boron doped diamond Graphite powders Boron oxide powders Optical emission spectroscopy Dopamine

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An Element-Based Peridynamic Model for Elastic and Fracture Analysis of Composite Lamina

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Journal of Peridynamics and Nonlocal Modeling 2022年第4期4卷 527-554页

作者： Liu, Shuo Fang, Guodong Liang, Jun Jiang, Xinyu Yan, Xiangqiao Meng, Songhe Science and Technology On Advanced Composites in Special Environment Key Laboratory Harbin Institute of Technology Harbin 150001 China Institute of Advanced Structure Technology Beijing Institute of Technology Beijing 100081 China

An element-based peridynamic (EBPD) model for composite lamina is proposed to solve the displacement field, stress field, and crack propagation problems. The continuous change of material properties with the angle, such as the composite lamina with any fiber orientation, can be realized by the EBPD model. The model also defines the non-local stress and non-local strain, which can introduce damage criteria of continuum mechanics. The reducing element scheme is also introduced to improve the computation efficiency. The effectiveness of the model is demonstrated by a series of examples, including the displacement analysis, stress analysis, and crack growth of the composite lamina. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

关键词： Composite lamina Crack growth Element-based Peridynamics

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Polybenzimidazole functionalized electrolyte with Li-wetting and self-fluorination functionalities for practical Li metal batteries

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InfoMat 2022年第5期4卷 174-186页

作者： Dongjiang Chen Yuanpeng Liu Chuan Xia Yupei Han Qingwei Sun Xuchang Wang Wei Chen Xian Jian Weiqiang Lv Jianyi Ma Weidong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbinChina School of Physics University of Electronic Science and Technology of ChinaChengduChina School of Materials and Energy University of Electronic Science and Technology of ChinaChengduChina Institute of Atomic and Molecular Physics Sichuan UniversityChengduSichuanChina

Rough Li plating,low ionic conductivity,and low thermal stability of conventional electrolytes post-primary challenges for achieving reliable high-capacity rechargeable lithium batteries,for which lithiummetal is frequently proposed as themost promising anode *** low-polarity commercial polypropylene/polyethylene separators fail to support the application of high-energy-density Li anodes due to their rigid physicochemical properties and the high reactivity of Li metal,leading to fatal dendrite formation and vigorous exothermic reaction with ***,we develop a Li-wetting,flame-retardant binary polymer electrolyte by functionalizing poly(vinylidene fluoride)(PVDF)separators with nonflammable polybenzimidazole(PBI)to build safe room-temperature solid-state electrolyte membranes.A dendrite-free LiFePO4 cell with the solid polymer electrolyte(SPE)delivers a discharge capacity of 127 mAh g^(-1) at 25℃ with a capacity retention of 87.5%after 500 cycles at 0.5℃(0.15 mA cm^(-2)).Phase-field simulations and density functional theory calculations demonstrate that the negatively charged benzimidazole chains of PBI own superior affinity to lithium bis(trifluoromethanesulfonyl)imide(LiTFSI),and shares overlapping electron density with Li anode,giving rise to accelerated Li^(+)conduction at room temperature and uniform Li electrodeposition at the electrolyte/Li metal *** SPE is also flame-retardant since heat-resistant polytetrafluoroethylene and a dense,heat-blocking graphitized carbon layer are formed in intense heat throughdehydrogenation/fluorination of PVDF under the catalysis of Lewis base imidazole rings and the decomposition of benzimidazole rings in *** such fire-resistant mechanism is ever reported in conventional electrolytes.

关键词： flame-retardant properties Li metal polybenzimidazole solid polymer electrolyte uniform Li deposition

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CONFIGURATION ANALYSIS OF HYBRID METAL BI-STABLE composites 23

CONFIGURATION ANALYSIS OF HYBRID METAL BI-STABLE COMPOSITES

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23rd International Conference on Composite Materials, ICCM 2023

作者： Guo, Xiangwei Dong, Na Dai, Fuhong National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Harbin Institute of Technology Harbin150000 China Harbin Institute of Pharmaceutical Sciences ZBD Pharmaceutical Harbin150000 China

The bi-stable cylindrical shell is a thin-walled composite structure with a specific angle layup, which has two stable configurations and can maintain the unfolded state and the curled state without external constraints. This structure has the advantages of a simple curling storage device, a reliable unfolding process, and high storage efficiency, and has great application potential in space-deployable structures. In this paper, based on bi-stable composite materials, a method is proposed to change the deformation shape of the structure by mixing metals, to adjust the deformation characteristics of the structure to meet the needs of practical applications. The addition of metal layers to a bistable composite structure can alter the conformational curvature and also achieve the need for electrical and thermal conductivity. Here the mechanical properties of the mixed-metal bistable structure are simulated and analyzed by the finite element method. The results of this paper show that the addition of metals in different positions of the composite has a great influence on the two stable forms of the bi-stable structure. © 2023 International Committee on Composite Materials. All rights reserved.

关键词： Mixing

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Super broadband absorbing hierarchical CoFe alloy/porous carbon@carbon nanotubes nanocomposites derived from metal-organic frameworks

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Journal of Materials science & technology 2022年第23期118卷 218-228页

作者： Siyao Guo Yunfeng Bao Ying Li Hailong Guan Dongyi Lei Tiejun Zhao Baomin Zhong Zhihong Li School of Civil Engineering Qingdao University of TechnologyQingdao 266033China Postdoctoral Workstation Guangdong Dongpeng Holding Company LimitedGuangdong 528031China Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone Qingdao University of TechnologyQingdao 266033China National Key Laboratory of Science and Technology for National Defence on Advanced Composites in special Environments Harbin Institute of TechnologyHarbin 150080China

The exploitation of electromagnetic wave absorption(EMA) materials has attracted ever-increasing attention,not only because electromagnetic wave(EMW) originated from overuse of electronic products has threatened human' health seriously,but also because EMA materials can effectively protect radar stealth from being ***,it is still a challenge to obtain broadband and efficient EMA materials to satisfy practical *** this work,we developed a series of hierarchical CoFe alloy/porous carbon@carbon nanotubes(CoFe/PC@CNTs) nanocomposites through revising the proportion of Fe^(2+) in the metal-organic frameworks(MOFs)(CoFe-ZIF) precursor and one-step simple pyrolysis *** cross deposition between CoFe alloy,carbon nanotubes(CNTs),and porous carbon(PC) formed a double conductive network,favoring for achieving excellent EMA ***,when the filler mass ratio is only 10 wt%,the optimized CoFe/PC@CNTs nanocomposites display the best EMA capability,whose minimum reflection loss(RL_(min)) value is-68.94 dB at 13.69 GHz and the effective absorption band(EAB,<-10 dB) reaches up 9.14 GHz with a matching thickness of 2.63 *** addition,the largest EAB can achieve up to 11 GHz(3.35-14.35 GHz) during all matching *** splendid EMA performance benefits the favorable dielectric loss provided by the double conductive network,the good magnetic loss benefited from the evenly distributed CoFe alloy,the excellent impedance matching,rich transmission paths,and multiple ***,such EMA materials with super broadband absorbing provide desirable candidates for lightweight and high-efficient microwave absorbers.

关键词： Electromagnetic wave absorption CoFe alloy/porous carbon@carbon nanotubes nanocomposites Broadband absorbing Metal-organic frameworks

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Exploring the Multi-Scale Evolution Mechanism of the Ultra-High-Temperature Mechanical Behaviour of Carbon/Carbon composites

SSRN

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SSRN 2024年

作者： Song, Lichao Meng, Songhe Zhang, Ying Yang, Fan Xie, Weihua National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Key Laboratory of Advanced Functional Composite Materials Aerospace Research Institute of Materials & Processing Technology Beijing100076 China

The microstructure and mechanical properties of Carbon/Carbon (C/C) composites were investigated after ultra-high-temperature heat treatment (HTT) in the range of 30 – 2950 °C. The effect mechanism of high temperatures on the mechanical behaviour of C/C composites was proposed for three scales, i.e., graphene sheets, carbon fibre (CF) monofilaments, and C/C composites. The results displayed that the tensile strength of CF monofilaments decreases monotonically as the HTT increases in the range of 2000 – 2950 °C, while C/C composites present a tendency to decrease and then increase, demonstrating that CF/matrix interfacial properties play a decisive role in the tensile properties. The compression and flexural properties showed a trend opposite to the tensile properties, Young’s modulus of both CF monofilaments and C/C composites increases. A turning point in the microstructure of C/C composites was observed after HTT at 2700 °C, in which the graphitisation degree decreases and the size of graphene sheets becomes fluctuating, while the high-temperature mechanical properties began to be superior to room temperature (RT). The high-temperature mechanical properties of C/C composites were regulated by the competing mechanisms of the graphite crystallite structure and the skin-core structure of CF monofilament, the CF/matrix interfacial strength and the porosity of C/C composites. © 2024, The Authors. All rights reserved.

关键词： Carbon fibers

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Mechanics model of inner core debonding of interface-reinforced composite honeycomb sandwich beam 5

Mechanics model of inner core debonding of interface-reinfor...

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5th International Conference on Material science and technology, ICMST 2025

作者： Xue, Pengcheng Xiong, Jian Center for Composite Materials and Structures Harbin Institute of Technology Harbin150001 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China

ISBN: (纸本)9781510691742

Enhanced face-core interfacial bonding performance increases the sensitivity of the structure to core defects. The debonding failure of the inner core in an interface-reinforced composite honeycomb sandwich beam is studied through theoretical modeling and experimental testing. Utilizing the principles of minimum potential energy, Timoshenko's beam theory as well as the Extended High Order Sandwich Panel Theory (EHSAPT), a theoretical model is formulated to clarify the mechanism of inner core debonding. The exponential cohesive zone model (CZM) is used to represent the interfacial mechanical responses of both the face-core and inner core interfaces. Additionally, the theoretical model incorporates the mechanical mechanism of dual crack propagation. The interface-reinforced composite honeycomb sandwich beams are fabricated and the double cantilever beam (DCB) experiments are carried out to reveal the debonding mechanism. The theoretical findings are in accordance with the experimental data when comparing the load-displacement curves and the debonding mode. © 2025 SPIE. All rights reserved.

关键词： Debonding

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A Multi-Bionic Design Strategy for Flexible, Efficient and Robust High-Performance Energy Absorption Systems Based on Interlocking Sutures Integrated with Bouligand-Arranging Perforations

SSRN

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SSRN 2024年

作者： Wang, Chao Li, Jiaxuan Sui, Chao Sang, Yuna Zhou, Yichen Zang, Zifu Zhao, Yushun He, Xiaodong National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China School of Astronautics Harbin Institute of Technology Harbin150001 China

As an emerging protective device, the self-locked systems are lightweight, flexible, customizable, and portable. However, existing systems suffer from a low degree of deformation and mechanically inefficient connection structures. To address these issues, a multi-bionic design strategy for high-performance self-locked system was proposed in this work, which perfectly combines the robust joint structure of the interlocking suture with the efficient deformation mode of the Bouligand structures. In the design process, the interlocking suture-inspired system was first studied separately, and its structural stability and deformation behavior were investigated through FEM simulations and experiments. The results showed that, the self-locked system has good structural stability and scalability, while its deformation degree still needs to be improved when the radius/length ratio of the tube units is small. Therefore, inspired by the efficient deformation mode of the Bouligand structure, perforated self-locked systems were developed by perforating a sequence of holes with Bouligand-like distribution in the sidewalls of the tube units. Simulations show that the perforated systems are not only structurally robust, but also have an efficient deformation mode. Compared to other perforated systems, the double-helix perforated system with four vertical perforations is absolutely dominant in the comprehensive evaluation of various mechanical performance indicators. In addition, experimental results showed that the double-helix perforated system can reduce the weight by 10% while increasing the specific energy absorption by 58% compared to non-perforated systems. Therefore, this multi-bionic strategy can integrate the advantages of different natural structures and provide new insights for the design of high-performance protection systems. © 2024, The Authors. All rights reserved.

关键词： Energy absorption

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