检索结果-内蒙古大学图书馆

Diselenide as a Dual Functional Mechanophore Capable of Stress Self-Reporting and Self-Strengthening in Polyurethane Elastomers

引用

CCS Chemistry 2023年第4期5卷 925-933页

作者： Xiaopei Li Fan Yang Yiran Li Cheng Liu Peng Zhao Yi Cao Huaping Xu Yulan Chen Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin 300072 Department of Physics Collaborative Innovation Center of Advanced MicrostructuresNational Laboratory of Solid State MicrostructureNanjing UniversityNanjingJiangsu 210093 Department of Chemistry Key Laboratory of Organic Optoelectronics and Molecular EngineeringTsinghua UniversityBeijing 100084 College of Chemistry State Key Laboratory of Supramolecular Structure and MaterialsJilin UniversityChangchunJilin 130012

Unlike biological materials that can sense mechanical force and actively remodel locally,synthetic polymers typically break down under ***-level responses to damage with both stress-reporting and self-strengthening functions are significant yet difficult to realize for synthetic *** overcome this challenge,chemo-mechanical coupling into polymers that can simultaneously ameliorate mechanical,optical,or other functional properties of a polymer combined with mechanical treatment will offer a new principle for materials ***,we report a kind of elastomer in which destructive forces are channelled into productive and bond-forming reactions by using diselenide(Se–Se)as a *** has been functionalized with labile Se–Se bonds,whosemechanical activation generates seleno radicals that trigger radical transfer and cross-linking reactions in *** reactions are activated efficiently in a mechanical way by compression in bulk *** resulting covalent networks possess turn-on mechano-fluorescence and increased moduli,which provide the functions of stress reporting,mechano-healing,and mechano-remodeling for the deformed *** study not only illuminates themechano-responsive nature of Se–Se bonds in the bulk state but also paves the way for the development of new stress-responsive materials.

关键词： diselenide mechano-responsive polymers self-strengthening polymermechanochemistry stress sensing

来源：评论

学校读者我要写书评

暂无评论

Sub-nanometer supramolecular rectifier based on the symmetric building block with destructive σ-interference

引用

science China Chemistry 2021年第8期64卷 1426-1433页

作者： Longfeng Huang Yu Zhou Yaorong Chen Jingyao Ye Junyang Liu Zongyuan Xiao Chun Tang Haiping Xia Wenjing Hong State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China Shenzhen Grubbs Institute Department of ChemistrySouthern University of Science and TechnologyShenzhen518055China

Molecular rectifier, as a basic function of molecular electronic devices, has attracted extensive attention for the opportunity in constructing sub-nanometer electronic devices. However, tunneling leakage current has a significant contribution as electronic devices shrink in size, which leads to a challenge in fabricating molecular rectifiers at the sub-nanometer scale. Here, we experimentally demonstrate a sub-nanometer molecular rectifier based on the supramolecular junction assembled between water and 1,4-diazabicyclo[2.2.2]octane (DABCO) molecule. The charge transport through DABCO and corresponding supramolecular junctions exhibits destructive σ-interference, ensuring a sharp conductance variation for transmission modulation. The supramolecular interaction between DABCO and water readily introduces the asymmetric electrode-molecule interaction, which combines with the destructive σ-interference to support the sub-nanometer rectification.

关键词： electron transport single-molecule studies conducting material molecular devices quantum interference

来源：评论

学校读者我要写书评

暂无评论

Large Electrocaloric Refrigeration Performance in Ferroelectric Polymer Nanocomposite with Complementary Nano-Structural Fillers

SSRN

引用

SSRN 2025年

作者： Zhao, Min Huang, Junyu He, Yu Li, Tingfeng Xu, Cuiping Ji, Peiqi Xu, Ziyi Li, Xiaolei Tan, Yiyu Zhang, Aimei Cai, Hong-Ling Wu, X.S. Collaborative Innovation Center of Advanced Microstructures Lab of Solid State Microstructures School of Physics Nanjing University Nanjing210093 China Department of Polymer Science and Engineering Key Laboratory of High-Performance Polymer Materials and Technology of MOE State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry & Chemical Engineering Nanjing University Nanjing210023 China College of Mechanics and Engineering Science Hohai University Jiangsu Province Nanjing211189 China Institute of Materials Engineering Nanjing University Nantong Jiangsu226019 China National Laboratory of Solid State Microstructures China

Electrocaloric (EC) refrigeration in nanocomposites provides sustainable heating and cooling through its excellent entropy change when applied or withdraw an electric field. Nonetheless, it's difficult to achieve a large EC performance under low electric fields since ferroelectrics have relatively low thermal conductivity and small diabatic temperature change. In this work, we design an EC nanocomposite by incorporating 12%[0.68(BaZr0.2Ti0.8O3)-0.32(Ba0.7Ca0.3TiO3)] (BCZT) nanoparticles with significant ferroelectric properties and 7%Boron Nitride nanosheets (BNNSs) with notable electrical insulation and ultra-high thermal conductivity into relaxor ferroelectric terpolymer P(VDF-TrFE-CFE), aiming to improve ECE performance and increase cooling power density of the nanocomposite. We attain an adiabatic temperature change (ΔT) of 8.85K, isothermal entropy change (ΔS) of 30.10J·kg-1·K-1 and isothermal cooling energy density (Q) of up to 5.10×107J·m-3 under a low electric field of 80 MV/m by direct method, which is an order of magnitude larger than those of other EC materials reported so far. The introduced interfacial coupling effect between ceramic and terpolymer plays a very important role to ECE, which modulates their polarization, microscale electric-dipoles changes, and energy conversion behavior, simultaneously improves the cooling power density of nanocomposite. Furthermore, the heat transfer performance of nanocomposite is simulated using Finite-element method (FEM) to investigate their heat transfer properties based on the solid-state heat transfer theory. The phase-field simulation has demonstrated the nanocomposite still possesses impressive ferroelectric properties under the influence of elastic compressive strain based on time-dependent Landau-Ginzburg-Devonshire (TLGD) theory. This research is of significant importance for achieving precise thermal management of the next-generation microelectronic devices. © 2025, The Authors. All rights reserved.

关键词： Ferroelectricity

来源：评论

学校读者我要写书评

暂无评论

通过高通量研究识别用于本征陡坡晶体管的原子级薄孤立能带沟道材料

引用

science Bulletin 2024年第10期69卷 1427-1436页

作者：屈恒泽张胜利曹江吴振华柴扬李卫胜李连忠任文才王欣然曾海波 MIIT Key Laboratory of Advanced Display Materials and Devices College of Material Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing 210094China Key Laboratory of Microelectronics Device and Integrated Technology Institute of Microelectronics of Chinese Academy of SciencesBeijing 100029China Department of Applied Physics The Hong Kong Polytechnic UniversityHong Kong 999077China National Laboratory of Solid State Microstructures School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China Department of Mechanical Engineering The University of Hong KongHong Kong 999077China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Integrated Circuits Nanjing UniversitySuzhou 215163China Suzhou Laboratory Suzhou 215009China

Developing low-power FETs holds significant importance in advancing logic circuits,especially as the feature size of MOSFETs approaches sub-10 ***,this has been restricted by the thermionic limitation of SS,which is limited to 60 mV per decade at room ***,we proposed a strategy that utilizes 2D semiconductors with an isolated-band feature as channels to realize subthermionic SS in *** high-throughput calculations,we established a guiding principle that combines the atomic structure and orbital interaction to identify their sub-thermionic transport *** guides us to screen 192 candidates from the 2D material database comprising 1608 ***,the physical relationship between the sub-thermionic transport performances and electronic structures is further revealed,which enables us to predict 15 systems with promising device performances for low-power applications with supply voltage below 0.5 *** work opens a new way for the low-power electronics based on 2D materials and would inspire extensive interests in the experimental exploration of intrinsic steep-slope MOSFETs.

关键词： 2D materials Electronic band structures Transport properties Steep-slope transistors DFT-NEGF calculations

来源：评论

学校读者我要写书评

暂无评论

Metastable charge distribution between degenerate Landau levels

引用

Physical Review B 2024年第3期109卷 035305-035305页

作者： Wenlu Lin Xing Fan Lili Zhao Yoon Jang Chung Adbhut Gupta Kirk W. Baldwin Loren Pfeiffer Hong Lu Yang Liu International Center for Quantum Materials Peking University Haidian Beijing 100871 China National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering College of Engineering and Applied Sciences Nanjing University Nanjing 210093 China Department of Electrical Engineering Princeton University Princeton New Jersey 08544 USA Shishan Laboratory Suzhou Campus of Nanjing University Suzhou 215000 China

We study two-dimensional electron systems confined in wide quantum wells whose subband separation is comparable with the Zeeman energy. Two N=0 Landau levels from different subbands and with opposite spins are pinned in energy when they cross each other and electrons can freely transfer between them. When the disorder is strong, we observe clear hysteresis in our data corresponding to the instability of the electron distribution in the two crossing levels. When the intralayer interaction dominates, multiple minima appear when a Landau level is 13 or 23 filled and the fractional quantum Hall effect can be stabilized.

关键词： Capacitance Electrical properties Landau levels Quantum Hall effect III-V semiconductors Two-dimensional electron gas Resistivity measurements

来源：评论

学校读者我要写书评

暂无评论

Tunable MEMS-VCSEL with High-Contrast Grating

Tunable MEMS-VCSEL with High-Contrast Grating

引用

2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Wang, Minglu Zheng, Wanhua Liu, Anjin School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences Beijing China Institute of Semiconductors Chinese Academy of Sciences State Key Laboratory on Integrated Optoelectronics Beijing China Institute of Semiconductors Chinese Academy of Sciences Key Laboratory of Solid-State Optoelectronics Information Technology Beijing China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing China

ISBN: (纸本)9798350312614

We design and fabricate a tunable micro-electro-mechanical system (MEMS) vertical-cavity surface-emitting laser (VCSEL) at 940-nm range. The MEMS-VCSEL uses a movable high-contrast grating (HCG) mirror to replace the top semiconductor distributed Bragg reflector (DBR) of the common VCSEL. By applying a reverse voltage across the air layer, the HCG moves downward under the electrostatic force, thereby changing the wavelength of the MEMS-VCSEL. Theoretically, the MEMS-VCSEL with this structure can achieve a maximum wavelength tuning range of over 30 nm. At present, we have realized a tuning range of 3.7 nm at room temperature. © 2023 IEEE.

关键词： HCG MEMS Tunable VCSEL

来源：评论

学校读者我要写书评

暂无评论

Topological spin textures in 1T-phase Janus magnets: Interplay between Dzyaloshinskii-Moriya interaction, magnetic frustration, and isotropic higher-order interactions

引用

Physical Review B 2023年第5期107卷 054408-054408页

作者： Peng Li Dongxing Yu Jinghua Liang Yonglong Ga Hongxin Yang Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China Center of Materials Science of Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China National Laboratory of Solid State Microstructures School of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

The search for topological magnetism in two-dimensional (2D) magnetic materials is one of the hot topics in spintronics. We present comprehensive studies of magnetic phases in a series of Janus monolayers MnXZ (MnAsBr, MnAsI, MnPBr, and MnPCl) and CrYZ (Y=Se, Te; and Z=Cl, Br, I) via combining first-principles calculations and atomistic spin model simulations. Sizable Dzyaloshinskii-Moriya interaction can be realized in the MnXZ and CrYZ monolayers due to their intrinsic inversion symmetry breaking. More interestingly, the MnXZ and CrYZ monolayers exhibit different degrees of magnetic frustration and isotropic higher-order interactions. Lastly, our atomistic spin model simulations demonstrate that a variety of topological spin textures can be generated by the interplay among complex magnetic interactions. These results provide valuable information and fundamental understanding for topological magnetism in 2D magnets.

关键词： Dzyaloshinskii-Moriya interaction Exchange interaction Skyrmions Spin texture 2-dimensional systems

来源：评论

学校读者我要写书评

暂无评论

Research on additive manufacturing and properties of Ni-Al-Cr medium-entropy alloy

引用

materials Today Communications 2025年 46卷

作者： Wang, Wei Wu, Dongting Yin, Haidong Zhu, Zihao Gao, Zhenhuan Nie, Liping Liu, Ying Zou, Yong Key Laboratory of Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Shandong Jinan250061 China School of Materials Science and Engineering Shandong University Shandong Jinan250061 China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Deyang618000 China School of Materials Science and Engineering Sichuan University Chengdu610065 China Shandong Engineering & Technology Research Center for Modern Welding Shandong University Jinan250061 China

This study utilized Cold Metal Transfer (CMT) technology to prepare manufactured Ni-Al-Cr medium-entropy alloy (MEA) samples through Wire Arc Additive Manufacturing (WAAM) in combination with self-made nickel-based flux-cored wire. The specimens in the manufactured condition were fabricated by cold metal transfer (CMT) deposition onto IN939 nickel-based superalloy substrates, followed by post-deposition annealing at 1273 K for 96 h. The wire arc additively manufactured Ni-Al-Cr MEA in the as-deposited condition exhibited a microstructure comprising γ phase, γ'-Ni₃Al phase, β-NiAl phase, α-Cr phase, and 14M phase, with a hardness of 431.0–455.2 HV0.2. However, it demonstrated brittle fracture behavior at 700 °C (tensile strength ∼ 400 MPa, elongation 1 %). After annealing at 1273 K for 96 h, the 14M phase disappeared while γ' and α-Cr phases coarsened, accompanied by recrystallization. The hardness decreased to 200–400 HV0.2, with the fracture mode transitioning to ductile fracture. Notably, the tensile strength significantly increased to 721.69–782.13 MPa, accompanied by enhanced elongation reaching 10.53–12.82 %. High-temperature wear tests revealed a transition from abrasive wear in the as-deposited state to adhesive wear after annealing, with both conditions exhibiting excellent wear resistance. © 2025

关键词： Brittle fracture

来源：评论

学校读者我要写书评

暂无评论

Ultralarge polarization in ferroelectric hafnia-based thin films

arXiv

引用

arXiv 2024年

作者： Wu, Han Lin, Kun Zhang, Qinghua Yu, Qian Fu, Xiaoqian Li, Qiang Cheviri, Meera Diéguez, Oswaldo Xu, Shuai Gu, Lin Cao, Yili Wang, Jiaou Wang, Zhen Chen, Yu Wang, Huanhua Deng, Jinxia Miao, Jun Xing, Xianran Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Solid State Chemistry University of Science and Technology Beijing Beijing100083 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Center of Electron Microscopy State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou310027 China Department of Materials Science and Engineering The Iby and Aladar Fleischman Faculty of Engineering The Raymond and Beverly Sackler Center for Computational Molecular and Materials Science Tel Aviv University Tel Aviv Israel Institute of High Energy Physics University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing100049 China Pico Electron Microscopy Center School of Materials Science and Engineering Hainan University Haikou Hainan570228 China

Hafnia-based ferroelectrics have become a valuable class of electronic functional materials at the nanoscale, showing great potential for next-generation memory and logic devices. However, more robust ferroelectric properties and better understanding of the polarization mechanisms are currently needed both in technology and science. Herein, we report the properties of oxygen-deficient Hf0.5Zr0.5O2 films with ultralarge remanent polarization (Pr) of 387 μC cm-2 at room temperature (1 kHz). Structure characterizations identify a new ferroelectric monoclinic Pc phase in these Hf0.5Zr0.5O2 films. The in-situ STEM measurements evidence polar displacements of the oxygen atoms, which move up and down in the Pc structure under applied DC bias fields, showing a huge displacement (δ= 1.6 Å). DFT calculations optimized the Pc structure and also predicted a large polarization. The coexistence of the ferroelectric monoclinic (Pc) phases and orthorhombic (Pca21) is responsible for this superior ferroelectric properties. These findings are promising for hafnia-based ferroelectric applications in integrated ferroelectric devices, energy harvesting and actuators, etc. © 2024, CC BY-NC-ND.

关键词： Polarization

来源：评论

学校读者我要写书评

暂无评论

An Efficient Boron Source Activation Strategy for the Low‑Temperature Synthesis of Boron Nitride Nanotubes

引用

Nano-Micro Letters 2025年第1期17卷 548-558页

作者： Ying Wang Kai Zhang Liping Ding Liyun Wu Songfeng E Qian He Nanyang Wang Hui Zuo Zhengyang Zhou Feng Ding Yue Hu Jin Zhang Yagang Yao National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional Materialsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093People’s Republic of China School of Electronic Information and Artificial Intelligence Shaanxi University of Science&TechnologyXian 710000People’s Republic of China College of Bioresources Chemical and Materials Engineering Shaanxi University of Science&TechnologyXian 710000People’s Republic of China Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325000People’s Republic of China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518000People’s Republic of China College of Chemical and Molecular Engineering Peking UniversityBeijing 100871People’s Republic of China

Lowering the synthesis temperature of boron nitride nanotubes(BNNTs)is crucial for their *** primary reason for adopting a high temperature is to enable the effective activation of highmelting-point solid *** this study,we developed a novel approach for efficiently activating boron by introducing alkali metal compounds into the conventional MgO–B *** approach can be adopted to form various low-melting-point AM–Mg–B–O growth *** growth systems have improved catalytic capability and reactivity even under low-temperature conditions,facilitating the synthesis of BNNTs at temperatures as low as 850℃.In addition,molecular dynamics simulations based on density functional theory theoretically demonstrate that the systems maintain a liquid state at low temperatures and interact with N atoms to form BN *** findings offer novel insights into the design of boron activation and are expected to facilitate research on the low-temperature synthesis of BNNTs.

关键词： Boron nitride nanotubes Low-temperature Boron activation 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：