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A Hierarchical Core-Sheath Structure Composite Fiber of Pw/Tpu for Elastic Smart Fabrics Enabling Wearable Personal Thermal Management

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SSRN 2023年

作者： Hu, Luyang Chen, Jiadong She, Jing Li, Fabing Liao, Junjie Zhou, Yufeng Zhang, Yumin School of Materials Science and Engineering Anhui University of Science and Technology Huainan232001 China Anhui International Joint Research Center for Nano Carbon-based Materials and Environmental Health Huainan232001 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Harbin150001 China

Elasticity and stability play a crucial role in phase change fibers (PCFs), ensuring both comfort and effective thermal management in fabrics. In this study, we present the development of an elastic and shape-stable phase change fiber through coaxial wet spinning. The fiber consists of a paraffin wax (PW) core encapsulated in a thermoplastic polyurethane (TPU) sheath, providing reliable protection against leakage during use. The obtained PCFs exhibit a PW loading capacity of up to 64.9 wt.% and a heating enthalpy of 117.0 J/g. Notably, these fibers maintain their morphological and thermal stability even after undergoing 50 cycles of heating and cooling treatments. By integrating the PCFs into a fabric and coating the surface with CNTs, the PCFs-based fabric achieves an outstanding photothermal conversion efficiency of 95.1% under a light intensity of 250 mW/cm2 and an electrothermal conversion efficiency of 73.2% at a power level of 0.9 W. Furthermore, the fabric, woven with uniformly broken PW core, exhibits excellent tensile resilience in various conditions, including room temperature and during photothermal and electrothermal conversion processes. This study introduces a promising avenue for the development of innovative PCFs, offering significant potential for their application in the realm of personal smart fabrics, particularly in the field of advanced thermal management. © 2023, The Authors. All rights reserved.

关键词： Fibers

Confined Pyrolysis-Driven One-Dimensional Carbon Structure Evolution from Polyacrylonitrile Fiber and its Microwave Absorption Performance

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SSRN 2023年

The evolution of one-dimensional carbon structures from polyacrylonitrile (PAN) fiber precursors is investigated based on confined pyrolysis strategy, which is employed to convert electrospun PAN fibers into carbon in a closed system. Carbon tube with ultra-large diameter derived from silica-coated organic PAN precursor fiber is observed and its low-performance of microwave absorption is revealed. To enhance microwave absorption, cobalt acetylacetonate is introduced as a magnetic resource into PAN, facilitating one-dimensional carbon structure evolution and yielding magnetic/carbon nanofibers. The mechanism resulting in such one-dimensional carbon structure evolution is discussed. The microwave absorption performances of the prepared magnetic carbon nanofibers are analyzed based on their complex permittivity and permeability. Remarkably, the magnetic carbon nanofibers exhibit strong microwave absorption intensity of -42 dB at only 20 wt% filler content. Further simulations are conducted based on radar-absorbing structure with prepared magnetic carbon nanofibers-coated laminate and wing models by using CST software. The laminated composite structure appears the maximum RCS reduction value of 18.70 dBsm at 6 GHz with 3.0 mm thickness in the frequency range of 2-18 GHz. In the corresponding wing structure, highly efficient electromagnetic wave absorption is observed and the RCS reduction can achieve -14.12 dBsm at 10 GHz with 3.5 mm thickness. © 2023, The Authors. All rights reserved.

关键词： Carbon nanofibers

Energizing the future:Empowering sustainability with Electron

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Electron 2023年第1期1卷 1-3页

作者： Jiecai Han Wei Huang Shu-Hong Yu Ning Gu Sean Li Hyunjoon Song Robert Palgrave Chenglin Yan National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinChina Frontiers Science Center for Flexible Electronics Institute of Flexible Electronics(IFE)Northwestern Polytechnical UniversityXi'anChina Division of Nanomaterials&Chemistry Department of ChemistryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefeiChina Jiangsu Key Laboratory for Biomaterials and Devices School of Biological Science and Medical EngineeringSoutheast UniversityNanjingChina School of Materials Science and Engineering The University of New South WalesKensingtonNew South WalesAustralia Department of Chemistry and Center for Molecular Science Korea Advanced Institute of Science and TechnologyTaejonRepublic of Korea Department of Chemistry University College LondonLondonUK Collaborative Innovation Center of Suzhou Nano Science and Technology College of EnergySoochow UniversitySuzhouChina

The advent of industrial civilization has brought about enormous materials advancements;yet it has also caused a rapid depletion of natural resources,leading to global energy crisis and environmental *** human civilization,one fundamental issue stands at its core:how can we achieve a harmonious coexistence between humanity and nature?This question has become the key challenge of our time,demanding our utmost attention and concerted efforts.

关键词： pollution. civilization depletion

Layer Hall Detection of the Néel Vector in Centrosymmetric Magnetoelectric Antiferromagnets

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Physical Review Letters 2024年第9期133卷 096803页

作者： L. L. Tao Qin Zhang Huinan Li Hong Jian Zhao Xianjie Wang Bo Song Evgeny Y. Tsymbal Laurent Bellaiche School of Physics Key Laboratory of Material Simulation Methods and Software of Ministry of Education College of Physics International Center of Future Science National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience Smart Ferroic Materials Center Physics Department and Institute for Nanoscience and Engineering Department of Materials Science and Engineering Tel Aviv University Ramat Aviv Tel Aviv 6997801 Israel

The efficient detection of the Néel vector in antiferromagnets is one of the prerequisites toward antiferromagnetic spintronic devices and remains a challenging problem. Here, we propose that the layer Hall effect can be used to efficiently detect the Néel vector in centrosymmetric magnetoelectric antiferromagnets. Thanks to the robust surface magnetization of magnetoelectric antiferromagnets, the combination of sizable exchange field and an applied electric field results in the layer-locked spin-polarized band edges. Moreover, the Berry curvature can be engineered efficiently by an electric field, which consequently gives rise to the layer-locked Berry curvature responsible for the layer Hall effect. Importantly, it is demonstrated that the layer Hall conductivity strongly depends on the Néel vector orientation and exhibits rich electromagnetic responses, which can be used to detect the Néel vector reversal. Based on density functional theory calculations, we exemplify those phenomena in the prototypical Cr2O3 compound. A complete list of the magnetic point groups sustaining the layer Hall effect is presented, aiding the search for realistic materials. Our work proposes a novel approach to detect the Néel vector and holds great promise for antiferromagnetic spintronic applications.

关键词： Anomalous Hall effect Magnetoelectric effect Transport phenomena Antiferromagnets Multiferroics First-principles calculations k dot p method

Simultaneous Engineering of the Conductivity and Work Function of Biphenylene Via Fluorine Adsorption

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SSRN 2023年

作者： Zhang, Jiao Xie, Ying Tang, Yinan Qian, Yinyin He, Jing Wang, Zhe Zhang, Yanchang Chen, Jiankang Yang, Lin Zheng, Bing School of Chemistry and Materials Science Heilongjiang University Harbin150080 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China

Biphenylene (BP) is a new member of the two-dimensional C nanomaterial family, and successful fabrication of BP offers an excellent opportunity for developing innovative C-based electronics. However, its unusual metallicity critically restricts its applications in field-effect transistors (FETs) and photocatalysis. Simultaneously, its relatively low work function ( ,4.33 eV) seriously restricts its applications in anode materials of electronic devices. Therefore, understanding the tunabilities of electronic properties and of BP-based nanomaterials is crucial to guide experimental exploration;nevertheless, to date, little attention has been paid to this area. Herein, we theoretically demonstrate that conductivity of fluorinated BP (Fn-BP) evolves in the order metallic → semimetallic → semiconductivity with increasing F concentration, attributed to a bonding transition of BP (sp2 → sp2 + sp3 → sp3). Particularly, of BP can be significantly improved (4.82–6.97 eV) by fluorination, approximately two-fold higher than that of Fn-graphene owing to p electron transfer between F and BP. Consequently, metallic F2D-BP and F4S-BP with favorable s can be utilized as substitutes for Au and Pt anodes, respectively. Specifically, F8D-BP, F16D-BP, and F24D-BP with exceptional band gaps of 0.40, 2.80, and 3.44 eV, respectively, exhibit high potentials for making channel materials in FETs, candidate materials in photocatalysis, and buffer layers in solar cells, respectively. © 2023, The Authors. All rights reserved.

关键词： Electronic structure

Additive-Free Preparation of High-Toughness Al2o3/Zro2 Nanoceramics with Platelet Grain Through Spontaneously Formed Dendrite

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SSRN 2023年

作者： Liu, Xudong Yu, Yongdong 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 School of Materials Science and Engineering University of Jinan Jinan250024 China

Plate-like grain toughening represents an effective approach to enhance the toughness of ceramics, but most of them require additives to induce the formation of platelets. Herein, we propose a novel method to prepare platelet-toughed Al2O3/ZrO2 ceramics by pressureless sintering without any additives. The Al2O3/ZrO2 powder was prepared via combustion synthesis assisted by rapid water cooling. The synthesis process involved an ultra-high temperature and a rapid cooling rate, leading to the formation of Al-Zr-Y oxide solid solution with γ-Al2O3 or t-ZrO2 structure in the powders. The surface of the powder after being acid etched or annealed was investigated and the results indicated that the solid solution with γ-Al2O3 structure exhibited a dendrite morphology, which could develop into plate-like Al2O3 grains during annealing or pressureless sintering. The platelets can effectively improve the toughness by inducing crack deflection. Besides, many ZrO2 nanoparticles precipitated from the solid solution, which was also conducive to the enhancement of mechanical properties. Consequently, the toughness and the bending strength of the ceramic could reach up to 10.76 MPa·m0.5 and 759 MPa, respectively. Additionally, this method could be applied to fabricate platelet-toughened Al2O3/ZrO2 ceramics in a wide range of Al2O3 contents (60wt%~80wt%), thereby catering to diverse industrial applications. © 2023, The Authors. All rights reserved.

关键词： Platelets

Structural design and performance analysis of large inflatable solar membrane reflector

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Space Solar Power and Wireless Transmission

Space Solar Power and Wireless Transmission 2025年第1期2卷 54-64页

作者： Shuo Bian Size Ai Jianzheng Wei Zhimin Xie Guochang Lin Dongjie Zhang Huifeng Tan Qingxiang Ji Center for Composite Materials and Structures Harbin Institute of Technology Harbin 150080 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 China School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 China Université de Franche-Comté Institute FEMTO-ST CNRS Besançon 25000 France

With the growing global energy demand and the pursuit of sustainable energy, solar energy has received widespread attention as a clean and renewable energy source. A structural design of an inflatable, large-scale solar concentrating reflector based on in-orbit assembly is proposed in this paper. The axisymmetric inflated reflector surface is inversely designed through membrane mechanics, and the internal pressures to maintain the reflector surface morphology at different orbital positions and the tiny deformation produced by the reflecting surface under the action of the uniform pressure are determined. A inflatable-rigidizable support structure is prepared by using a rigidizable aramid fabric-reinforced composite. The support structure used to the parabolic reflecting surface is designed, and the diameter and spacing distance of the resistance wire of the heating layer are determined by electrothermal simulation; the combination of solar radiation and electric heating is used to rigidize the reflector in orbit, and the corresponding electric heating time at different orbital positions is also analyzed by in orbit simulation. The heating voltage, folding radius and folding method of the rigidizable support structure are determined through the experimental design, and the folding and deployment experiments are carried out by using the heating and internal pressure and the final shape recovery rate of the support tube is approximately 100 %, which verifies the feasibility of its folding and deployment.

关键词：

Recent progress in perovskite solar cells:from device to commercialization

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science China Chemistry 2022年第12期65卷 2369-2416页

作者： Xinhui Luo Xuesong Lin Feng Gao Yang Zhao Xiaodong Li Liqing Zhan Zexiong Qiu Jin Wang Cong Chen Lei Meng Xiaofeng Gao Yu Zhang Zijian Huang Rundong Fan Huifen Liu Yanrun Chen Xiaoxue Ren Jiahong Tang Chun-Hao Chen Dong Yang Yongguang Tu Xiao Liu Dongxue Liu Qing Zhao Jingbi You Junfeng Fang Yongzhen Wu Hongwei Han Xiaodan Zhang Dewei Zhao Fuzhi Huang Huanping Zhou Yongbo Yuan Qi Chen Zhaokui Wang Shengzhong(Frank)Liu Rui Zhu Jotaro Nakazaki Yongfang Li Liyuan Han State Key Laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Physics and Electronic Science Engineering Research Center of Nanophotonics&Advanced InstrumentMinistry of EducationEast China Normal UniversityShanghai 200241China Key Laboratory for Advanced Materials and Institute of Fine Chemicals School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage CenterSolar Energy Research CenterNankai UniversityTianjin 300350China College of Materials Science and Engineering&Engineering Research Center of Alternative Energy Materials&Devices Ministry of EducationSichuan UniversityChengdu 610065China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationSchool of Materials Science and EngineeringPeking UniversityBeijing 100871China School of Physics and Electronics Hunan Key Laboratory of Nanophotonics and DevicesCentral South UniversityChangsha 410083China Experimental Center for Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Jia

Perovskite solar cells(PSCs) are undergoing rapid development and the power conversion efficiency reaches 25.7% which attracts increasing attention on their commercialization *** this review,we summarized the recent progress of PSCs based on device structures,perovskite-based tandem cells,large-area modules,stability,applications and ***,the challenges and perspectives are discussed,aiming at providing a thrust for the commercialization of PSCs in the near future.

关键词： perovskite solar cells device engineering stability application

Toughening and Responsive Contractile Shape Memory Fibrous Membrane via Water for Mechanically Active Wound Dressing

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advanced Fiber Materials 2024年第6期6卷 1942-1954页

作者： Wen Liu Wei Zhao Kunrong Xie Xue Feng Li Yufu Wang Deyan Kong Yanju Liu Jinsong Leng National Key Laboratory of Science and Technology On Advanced Composites in Special Environment Harbin Institute of TechnologyHarbin 150080People’s Republic of China Department of Astronautical Science and Mechanics Harbin Institute of Technology(HIT)No.92 West Dazhi StreetP.O.Box 301Harbin 150001People’s Republic of China Department of Orthopedic Surgery Second Affiliated Hospital of Harbin Medical UniversityNo.246Baojian RoadHarbin 150086People’s Republic of China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyNo.92West Dazhi StreetHarbin 150001People’s Republic of China

Conventional wound dressings only protect passively against bacterial *** mechanically active adhesive dressings(AADs)are inspired by the active closure of embryonic *** can promote wound healing by actively con-tracting the wound *** meet the requirements of high toughness,stimulus-response,and dynamic adhesion proper-ties,which are ***,we construct a water-responsive shape memory polyurea fibrous membrane(PU-fm)featuring favorable toughness,wet-adhesion,breathability,absorbency of four times its weight,and ***,the water-toughened electrospun PU-fm is fabricated using a homemade polyurea(PU)elastomer with multistage hydrogen bond networks as a spinning ***,a Janus-structured polyurea-polydopamine-silver fibrous membrane(PU@PDA@Ag-fm)is engineered,integrating antibacterial properties without compromising mechanical *** demonstrates strong adhesion to the skin,actively promotes wound contraction,and enables adaptive wrapping of tissues of varying sizes by the water-driven shape memory *** tests and wound healing experiments indicate that the PU@PDA@Ag-fm has favorable antibacterial properties against Escherichia coli(***)and accelerates the wound healing rate by 20%.For the first time,water-responsive shape memory PU-fm as the AADs is constructed,providing a new strategy for wound *** can be extended to applications in other smart devices for biomedicine such as tendon repair,and bioelectronic interfaces.

关键词： Mechanically active dressing Electrospun fibrous membrane Janus structure Water-responsive shape memory