检索结果-内蒙古大学图书馆

arXiv 2025年

作者： Liu, Linlin Chen, Zuanquan Yang, Wensi Zhang, Sen Zhu, Jiaqi National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China

Nuclear radiation detectors play a crucial role in fields such as nuclear safety and medical imaging. The core of their performance lies in the selection of detection materials. Semiconductor detectors have become a hot topic in current research due to their advantages such as small size, good energy resolution, and high detection efficiency. As one of the most promising materials for fabricating room - temperature nuclear radiation semiconductor detectors, HgI2 exhibits excellent detection performance due to its high atomic number, large band gap, strong ray - stopping power, and high volume dark resistivity. However, issues such as poor chemical stability and low vacancy mobility of HgI2 limit its development. Therefore, researchers have carried out inorganic doping/organic hybridization on it. By introducing the organic ligand CH3NH3I, the synthesis of organic - inorganic hybrid compounds based on HgI2 is expected to significantly improve the stability of HgI2. Research on organic - inorganic hybrid metal halide crystals shows that this material has great application potential in the field of luminescent materials. In this paper, the crystal morphologies of (CH3NH3)2HgI4 under vacuum and in different solvent - anti - solvent systems were simulated. The crystal morphology of (CH3NH3)2HgI4 in the ethyl acetate - toluene system is long - plate - shaped, with the (002) plane being the largest exposed plane. Subsequently, a flake - shaped crystal with dimensions of 10 mm×9 mm×1 mm was prepared by the solution method in this system. XRD diffraction analysis revealed that its largest exposed plane is consistent with the morphology simulation results in this solvent system. Calculations show that (CH3NH3)2HgI4 is an indirect - band - gap semiconductor (Eg=3.28 eV). The ultraviolet - visible spectrum shows that its optical band gap is 3.11 eV, which is smaller than the calculated value. Therefore, it is speculated that there may be exciton luminescence in (CH3NH3)2HgI4. T

关键词： Crystal atomic structure

来源：评论

学校读者我要写书评

暂无评论

Vertically Aligned Silicon Carbide Nanowires/Boron Nitride Cellulose Aerogel Networks Enhanced Thermal Conductivity and Electromagnetic Absorbing of Epoxy composites

引用

Nano-Micro Letters 2022年第7期14卷 209-227页

作者： Duo Pan Gui Yang Hala MAbo-Dief Jingwen Dong Fengmei Su Chuntai Liu Yifan Li Ben Bin Xu Vignesh Murugadoss Nithesh Naik Salah MEl-Bahy Zeinhom MEl-Bahy Minan Huang Zhanhu Guo Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002People’s Republic of China Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon Tyne NE18STUK Integrated Composites Laboratory(ICL) Department of Chemical and Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA Advanced Materials Division Engineered Multifunctional Composites(EMC)Nanotech LLCKnoxvilleTN 37934USA College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024People’s Republic of China Department of Mechanical and Manufacturing Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipalKarnataka 576104India Department of Chemistry Turabah University CollegeTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Department of Chemistry Al-Azhar UniversityNasr CityCairo 11884Egypt

With the innovation of microelectronics technology, the heat dissipation problem inside the device will face a severe test. In this work, cellulose aerogel(CA) with highly enhanced thermal conductivity(TC) in vertical planes was successfully obtained by constructing a vertically aligned silicon carbide nanowires(SiC NWs)/boron nitride(BN) network via the ice template-assisted strategy. The unique network structure of SiC NWs connected to BN ensures that the TC of the composite in the vertical direction reaches 2.21 W m^(-1) K^(-1) at a low hybrid filler loading of 16.69 wt%, which was increased by 890% compared to pure epoxy(EP). In addition, relying on unique porous network structure of CA, EP-based composite also showed higher TC than other comparative samples in the horizontal direction. Meanwhile, the composite exhibits good electrically insulating with a volume electrical resistivity about 2.35 × 10^(11) Ω cm and displays excellent electromagnetic wave absorption performance with a minimum reflection loss of-21.5 dB and a wide effective absorption bandwidth(<-10 dB) from 8.8 to 11.6 GHz. Therefore, this work provides a new strategy for manufacturing polymer-based composites with excellent multifunctional performances in microelectronic packaging applications.

关键词： Epoxy Ice template Vertical alignment Thermal conductivity Multifunctionality

来源：评论

学校读者我要写书评

暂无评论

Origami-Based Bidirectional Self-Locking System for Energy Absorption

SSRN

引用

SSRN 2022年

作者： Chen, Zongbing Wei, Xingyu Yang, Lihong 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 Key Laboratory of Advanced Ship Materials and Mechanics Harbin Engineering University Harbin150001 China

When a periodic structure is subjected to loads exceeding the material yield strength, dislocation slip occurs in its internal unit cells, resulting in a sharp decline in macro mechanical properties. Periodic structures with self-locking effect can overcome this inherent defect and achieve distinguished performance including high energy absorption efficiency. In this respect, thin-walled periodic self-locking dissipative structures have been extensively investigated in recent years. These existing self-locking systems belong to two-dimensional structures and can realize self-locking effect only under the specific load. This paper presents a three-dimensional origami-based bidirectional self-locking system, which can realize self-locking effect under the combined action of normal and shear stress. The energy absorption mechanism of the origami-based cell was revealed by the plastic hinge model, and its specific energy absorption is higher than that of other existing self-locking cells. The compression and bending tests of the origami-based system were carried out, which proved its bidirectional self-locking capacity. This proposed origami-based system possesses excellent energy absorption efficiency, and the unique bidirectional self-locking strategy can significantly expand the design space for periodic energy absorption metamaterials. © 2022, The Authors. All rights reserved.

关键词： Energy absorption

来源：评论

学校读者我要写书评

暂无评论

Tailoring the Ionic Conductivity of Composite Electrolyte by La-Doping Regulated Li4ti5o12 for Solid State Lithium Metal Batteries

SSRN

引用

SSRN 2024年

作者： Gui, Feng Zhou, Xuan Huang, Ke Li, Xue Yan, Zhihan Luo, Zhen Yang, Liwen Huang, Jianyu Wang, Gang Xu, Guobao Ou, Xing Hunan Provincial Key laboratory of Thin Film Materials and Devices School of Materials Science and Engineering Xiangtan University Hunan411105 China Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and Engineering National University of Defense Technology Changsha410073 China School of Physics and Optoelectronics Xiangtan University Hunan411105 China National Energy Metal Resources and New Materials Key Laboratory School of Metallurgy and Environment Central South University Hunan Changsha410083 China

It is urgently required that polyethylene oxide (PEO) based electrolytes exhibit high Li+ conductivity and exceptional interfacial compatibility at wide temperature. In this study, La-doped two-dimensional (2D) Li4Ti5O12 nanosheets (La-LTO NSs) are firstly introduced into PEO (La-LTO/PL) to achieve composite polymer electrolytes (CPEs). The La doping can regulate the micro-structure of LTO NSs for realizing high aspect ratio and introducing rich oxygen vacancy, which significantly enhance the amorphous region and anchor adequate TFSI-. Furthermore, the DFT calculation reveals that enrichment of charge density gather around La element and oxygen vacancies, indicating the stronger interaction between La-LTO NSs and PEO/TFSI-. Therefore, the CPEs deliver multiple ion-transport channels including the interface between the La-LTO NSs and PEO, PEO chains and La-LTO NSs, enabling fast Li-ion transport and highly stable interface. As a result, the CPEs exhibit impressive ionic conductivity (2×10-4 S cm-1 under 30°C, 1×10-3 S cm-1 under 60°C) and steady electrochemical impedance value during 22 days. While the all-solid-state Li|LiFePO4 (Li|LFP) batteries deliver remarkable cycle stability for 400 cycles with high-capacity retention of 80% at 0.2 C under 30°C. Moreover, the pouch cell of Li|LFP maintains approximately 100% capacity retention after 100 cycles. This work promotes the applications of CPEs in high-performance solid-state Li batteries. © 2024, The Authors. All rights reserved.

关键词： Aspect ratio

来源：评论

学校读者我要写书评

暂无评论

Photopolymerization and reaction sintering of ZrC/SiC ultra-high-temperature ceramics fabricated by 3D printing

引用

Ceramics International 2025年

作者： Wang, P. Zhu, S.S. Zhang, S.P. Su, F. Yuan, J.K. Jia, Y.J. Fu, Y.Q. Li, T. Zhang, Y.L. Ramasamy, P. Eckert, J. Lao, C.S. Chen, Z.W. Henan Key Laboratory of High Performance Carbon Fiber Reinforced Composites Institute of Carbon Matrix Composites Henan Academy of Sciences Zhengzhou450046 China Additive Manufacturing Institute Shenzhen University Nanhai Avenue 3688 Shenzhen518060 China Zhengzhou Research Institute Harbin Institute of Technology Zhengzhou450000 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Department of Mechanical Engineering City University of Hong Kong Tat Chee Avenue Kowloon Tong Kowloon Hong Kong Erich Schmid Institute of Materials Science Austrian Academy of Sciences Jahnstraße 12 LeobenA-8700 Austria Department of Materials Science Chair of Materials Physics Montanuniversität Leoben Jahnstraße 12 LeobenA-8700 Austria

Zr-based ultra-high temperature ceramics (UHTCs) are widely used as the key parts of aircrafts in thermal protection systems. However, such materials usually have a high sintering temperature and it is difficult to obtain complex parts using traditional manufacturing methods. This study reports on the success preparation of complex Zr-based UHTCs by a light-curing 3D printing process. The results indicate that the smaller the precursor particle size, the higher is the viscosity of the slurry used for printing. Slurries with a better curing performance can be prepared by mixing various active diluents and photoinitiators with an optimized certain proportion. The stability of the slurry can be improved by adding coupling agents and dispersants. The main components of the 3D printed green parts are ZrC, SiC and pyrolytic carbon at 1800 °C, yielding a high compressive strength (102 ± 2 MPa) and elastic modulus (65 ± 1 GPa). ZrC/SiC composite ceramic parts with low open porosity (3.99 %) were obtained by 3D printing after heat treatment, which provides an effective way to design complex UHTC parts for extreme environment applications. © 2025

关键词： Compressive strength

来源：评论

学校读者我要写书评

暂无评论

Design and Composite Preparation of Sibcn Amorphous Ceramics Based on Self-Crosslinking technology

SSRN

引用

SSRN 2022年

作者： Liu, Yuxuan Cheng, Yuan Sun, Boqian Zhang, Wenzheng Liu, Futian School of Materials Science and Engineering University of Jinan Jinan250022 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

Amorphous ceramic matrix composites have been widely used in the aerospace field. In amorphous ceramics represented by SiBCN ceramics, the content of boron element is an important factor related to the ability of ceramics to maintain amorphous. However, the increase of boron content will lead to the decrease of the cross-linking ability of the precursor, reduce the yield of SiBCN ceramics, and affect the densification of the ceramics. Here we propose a new process that uses low boron content precursors as crosslinking agents to cross-link high boron content precursors. The ceramic yield is much higher than that of a single precursor, and the higher boron content The content makes SiBCN ceramics have excellent anti-crystallization ability, and the C f -SiBCN composites prepared therefrom have excellent anti-oxidation properties. The Cf-SiBCN composites we developed have shown great potential in aerospace structural components, high temperature engines and other fields. © 2022, The Authors. All rights reserved.

关键词： Oxidation resistance

来源：评论

学校读者我要写书评

暂无评论

Surface-Enhanced Transparent Conducting P-Type Cui−Ga2o3 Composite Films with High Hole Transport Performance and Stability

SSRN

引用

SSRN 2023年

作者： Xue, Ruibin Gao, Gang Yang, Lei Xu, Liangge Zhang, Yumin Zhu, Jiaqi National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Center of Analysis Measurement Harbin Institute of Technology Harbin150001 China Zhengzhou Research Institute Harbin Institute of Technology Zhengzhou450046 China Key Laboratory of Micro-systems and Micro-structures Manufacturing Ministry of Education Harbin Institute of Technology Harbin150080 China

CuI is a wide bandgap p-type transparent conductor with promising optoelectronic properties. However, conventional CuI films prepared through the iodination of Cu films exhibit rough surface, poor stability and excessively high hole concentration, hindering its application. Herein, we introduce CuI−Ga2O3 composite films as a substitution to overcome the shortcomings of pure CuI. During the iodination process, Ga2O3 hinders the mobility of CuI grain boundaries, resulting in small grain size and low surface roughness. After the charge re-equilibrium between Ga2O3 and CuI, the hole concentration in the films decreased by an order of magnitude. The interface effect of Ga2O3 at the grain boundaries of CuI, increases the hole mobility by 5 times and the conductivity by 53%. The ultra-wide band gap of Ga2O3 enhances the transmittance of CuI films in short wavelength region. Ga2O3 serves to passivate the grain boundaries of CuI, preventing the oxidation of CuI and the loss of iodine, consequently improving the stability of the films. This work deepens the understanding of the failure and hole transport mechanisms of CuI films. © 2023, The Authors. All rights reserved.

关键词： Stability

来源：评论

学校读者我要写书评

暂无评论

Bolt Design of Ceramic Matrix Composite and Superalloy Bolted Joint Based on Damage Failure Load

引用

Journal of Harbin Institute of technology(New Series) 2021年第2期28卷 55-61页

作者： Chao Lv Shuyuan Zhao Zhengyu Li Zeliang Pu Jianglong Dong Xinyang Sun Wenjiao Zhang China Academy of Aerospace Aerodynamics Beijing 100074China National Key Laboratory of Science and Technology for National Defense on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China School of Aeronautics and Astronautics Harbin Institute of TechnologyHarbin 150001China Engineering College Northeast Agricultural UniversityHarbin 150030China

Ceramic matrix composite(CMC)and superalloy bolted joints are commonly used high temperature connection structures in aerospace and aeronautical *** this paper,a finite element model coupled with progressive damage analysis of 2D C/SiC composites and superalloy bolted joint was implemented to simulate the uniaxial tensile loading process by using the ABAQUS finite element *** parametric effects of raised head bolt on stress distribution,tensile performance,and damage process were studied for the CMC⁃superalloy bolted joint *** results showed that the final failure load increased first to the maximum value,and then decreased with the rise of bolt diameter,bolt head diameter,and bolt head thickness,*** the three parameters were 5.0 mm,9.5 mm,and 2.8 mm for the current studied bolt configuration,the joint structure gave the maximum load bearing capacity for the considered parameter *** was also found that around 42%potential improvement in load bearing capacity could be achieved by very small adjustments in bolt parameters of the joints.

关键词： 2D C/SiC composite progressive damage analysis tensile properties bolted joint bolt parameters

来源：评论

学校读者我要写书评

暂无评论

A Li+-Flux-Homogenizing Separator for Long-Cycle Li Metal Anodes

SSRN

引用

SSRN 2023年

作者： Ji, Yuanpeng Dong, Liwei Liu, Jipeng Xie, Haodong Zhong, Shijie Yang, Mengqiu Liu, Yuanpeng Yang, Chunhui Han, Jiecai He, Weidong MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology 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 State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin150080 China Chongqing Research Institute Harbin Institute of Technology Chongqing401151 China School of Mechanical Engineering Chengdu University Chengdu610106 China

The uneven arrangement of pores and poor electrolyte affinity of separators made from polyolefins or poly(vinylidene difluoride) (PVDF) can result in disordered Li-ion (Li+) flux and rugged deposition layers, giving rise to continuous consumption of lithium salt and premature expiration of lithium metal batteries (LMBs). Although adjusting pore structure or modifying the surface of these separators is effective, it is space-occupied and not economically or industrially viable. Herein, we propose a novel and feasible method of incorporating the antistatic agent SN (SN), namely, octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate, with the PVDF-HFP matrix to create a homogeneous composite separator (PVDF-HFP/SN) for LMBs. The ammonium head of the SN molecule provides numerous anion-friendly sites that can absorb PF6- ions in the electrolyte. This leads to a Li-affinity integrated matrix, which allows for uniformly distributed Li+ in the SN···PF6-···Li+ configurations. These configurations guarantee a homogeneous Li+ flux distribution and deposition, and further, reduce the consumption of lithium salt, ensuring the ultralong cycling dendrite-free Li anode. Hence, using the PVDF-HFP/SN separator, we achieve exceptional stability in a Li||Li symmetric cell for 1000 hours with the lowest overpotential at 0.5 mA cm-2 with a capacity of 1 mAh cm-2, and the Li||LiFePO4 cell demonstrates a capacity of 120.4 mAh g-1 with an unparalleled capacity retention of 93.4% after 1000 cycles at 2 C (1 C = 170 mA g-1). This innovative design strategy for functional separators shows great promise in expanding the operation lifespan of LMBs. © 2023, The Authors. All rights reserved.

关键词： Separators

来源：评论

学校读者我要写书评

暂无评论

Anomalous thermal response of bulk diamond to uniaxial (100) strain: A first-principles prediction

引用

Physical Review B 2022年第18期106卷 184303-184303页

作者： Biao Wang Jiwen Zhao Yanwei Hu Yurong He Nikolay Rodionov Jiecai Han Jiaqi Zhu National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 China School of Energy Science & Engineering Harbin Institute of Technology Harbin 150001 China State Research Center of Russian Federation Troitsk Institute for Innovative and Fusion Research Troitsk Moscow 108840 Russia Key Laboratory of Micro-systems and Micro-structures Manufacturing Ministry of Education Harbin 150080 China

Diamond, a material that exhibits ultrahigh thermal conductivity with a sensitive thermal response to stress, is an ideal heat-sink material in the embedded cooling paradigm. This study uses first-principles calculations with the phonon Boltzmann transport equation to predict the variation rules of the thermal conductivity of diamond along the 〈100〉 crystal direction under strains at three orders of magnitude: 0.1%, 1%, and 10.5%. Density functional theory is used to predict the stress–strain dependence of diamond and the temperature-dependent thermal conductivity of unstrained diamond. The predictions are in good agreement with the experimental results. The calculated uniaxial strain–thermal conductivity dependence results reveal that the thermal conductivity of diamond abnormally increases by approximately 15% under small-scale uniaxial strain because of the weakened anharmonic interatomic force constants. Under large-scale strain, the thermal conductivity considerably decreases because of reduced phonon group velocities and increased numbers of phonon scattering channels. The findings in this study will guide analyses of the dependence of thermal conductivity on strain in other diamondlike structures, such as Group IV element-based materials. The abnormal thermal response at small strain is expected to lead to the realization of an artificial thermal conduction channel.

关键词： Thermal conductivity Diamond Boltzmann theory Density functional theory

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：