检索结果-内蒙古大学图书馆

Enhancing the mechanical and tribological properties of Mo-Cu composites via three-dimensional hierarchical micro/nano heterostructures induced by Al doping

引用

Journal of Alloys and Compounds 2025年 1021卷

作者： Zhuang, Zehang Li, Zongbo Long, Xiao Feng, Yan Wang, Richu Peng, Xiang Cai, Zhiyong School of Materials Science and Engineering Central South University Changsha410083 China National Key Laboratory of Science and Technology on High-strength Structural Materials Central South University Changsha410083 China Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province Central South University Changsha410083 China

While heterogeneous materials leverage synergistic interactions between distinct phases to overcome property trade-offs in homogeneous systems, controlling multiscale phase distribution and interfacial stability remains a critical challenge for achieving optimal performance. In this study, we address this fundamental issue through Al-doped hierarchical design, fabricating a novel Mo-Cu composite with three-dimensional (3D) multiscale heterogeneity. The microstructure, formation mechanisms, tribological behavior, and mechanical properties of the composite were systematically investigated. The Al-doped Mo-Cu composite exhibited distinctive structural characteristics, including: (1) a spatial network formed by micron-sized Mo phases within the Cu matrix;(2) submicron-sized Mo phases predominantly surrounding the micron-sized Mo phases, with some dispersed in the Cu matrix;(3) nanoscale Mo and Cu phases embedded in the Mo matrix;and (4) Al-rich nanoparticles distributed within Mo nanograins, at grain boundaries, and along Mo/Cu interfaces. First-principles calculations revealed that Al doping significantly reduces the formation energy and interfacial energy of the Mo-Cu system, mitigating phase separation and enhancing interfacial stability and bonding strength. The electron localization function (ELF) and partial density of states (PDOS) analysis further confirmed the formation of covalent bonds at Al-doped Mo/Cu and Mo/bcc Al interfaces, providing a theoretical basis for the observed microstructural features and outstanding properties. Compared to undoped composites, the Al-doped Mo-Cu composite exhibited a 9.1 % reduction in the average friction coefficient, along with substantial decreases in wear depth (2.6 %), wear width (14.4 %), and wear volume (23.4 %). Additionally, its hardness (525 HV), compressive strength (1795 MPa), and fracture compressive strain (10.3 %) increased by 24.4 %, 112.0 %, and 72.9 %, respectively, setting new performance benchmarks among sin

关键词： Compressive strength

来源：评论

学校读者我要写书评

暂无评论

Regulating the formation ability and mechanical properties of high-entropy transition metal carbides by carbon stoichiometry

引用

Journal of Materials science & technology 2022年第26期121卷 181-189页

作者： Juntao Song Guiqing Chen Huimin Xiang Fuzhi Dai Shun Dong Wenbo Han Xinghong Zhang Yanchun Zhou Science and Technology on Advanced Composite in Special Environments Laboratory Harbin Institute of TechnologyHarbin150080China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing100076China

Tremendous efforts have been dedicated to promote the formation ability of high-entropy transition metal ***,the majority of methods for the synthesis of high-entropy transition metal carbides still face the challenges of high temperature,low efficiency,additional longtime post-treatment and uncontrollable *** cope with these challenges,high-entropy transition metal carbides with regulatable carbon stoichiometry(HE TMC)were designed and synthesized,achieving improved ability for single phase solid solutions formation,promoting of sintering and controllable mechanical *** typical composition series,i.e.,easily synthesized(ZrHfTaNb)C(ZHTNC)and difficultly synthesized(Zr_(0.25)Hf_(0.25)Ta_(0.25)Ti_(0.25))C(ZHTTC)are selected to demonstrate the promoting formation ability of single phase solid solutions from carbon stoichiometry *** phase high-entropy ZHTTC,which has been proven difficult in forming a single phase solid solution,can be prepared with the decrease of C/TM ratio under 2000℃;while the high-entropy ZHTNC,which has been proven easy in forming a single phase solid solution,can be synthesized at lower temperatures with the decrease of C/TM *** synergistic effect of entropy stabilization and reduced chemical bond strength gaining from carbon stoichiometry deviations is responsible for the formation of single phase solid solutions and the promoted sintering of HE *** example,the relative density of bulk(ZrHfTaNb)C(SPS-ZHTNC)increases from 90.98%to 94.25%with decreasing the C/TM atomic ratio from 0.9 to *** importantly,the room temperature flexural strength,fracture toughness and brittleness index of SPS-ZHTNCcan be tuned in the range of 384 MPa–419 MPa,4.41 MPam–4.73 MPamand 3.679μm–4.083μm,***,the HE TMCprepared by adjusting the ratio of carbon to refractory transition metal oxides have great potential for achieving low temperature synthesis,promoted sintering and tunable properties.

关键词： Carbon stoichiometry High-entropy ceramics Transition metal carbide Low temperature synthesis Tunable mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Correction to: Durable Fe3O4/PPy Particle Flow Spun Textile for Electromagnetic Interference Shielding and Joule Heating (advanced Fiber Materials, (2025), 7, 2, (513-527), 10.1007/s42765-024-00498-2)

引用

advanced Fiber Materials 2025年 1-1页

作者： Liu, Jiaxin Qi, Shuo Wang, Hongshan Fu, Chiyu Xu, Weilin Su, Bin Tang, Wenyang Xia, Zhigang State Key Laboratory of New Textile Materials and Advanced Processing Technologies School of Textile Science and Engineering Industry Research and Development Center of Functional Materials and Textile New Technology Textile Industry Key Laboratory of Yarn and Its Functionalization Wuhan Textile University Hubei Wuhan430200 China State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China National Local Joint Engineering Laboratory of Resin-Based Structure and Functional Material Technology Hubei Xiaogan432100 China

In this article the first affiliation details for Jiaxin Liu were incorrectly given as 'State Key laboratory of New Textile Materials and advanced Processing Technologies, School of Textile science and Engineering, Wuhan Textile University, Wuhan, 430200, Hubei, People’s Republic of China' but should have been 'State Key laboratory of New Textile Materials and advanced Processing Technologies, School of Textile science and Engineering, Industry Research and Development Center of functional Materials and Textile New technology, Textile Industry Key laboratory of Yarn and Its functionalization, Wuhan Textile University, Wuhan, 430200, Hubei, People’s Republic of China'. The original article has been corrected. © Donghua University, Shanghai, China 2025.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Medium and high-entropy transition mental disilicides with improved infrared emissivity for thermal protection applications

引用

Journal of Materials science & technology 2023年第5期136卷 149-158页

作者： Juntao Song Yuan Cheng Huimin Xiang Fu-Zhi Dai Shun Dong Guiqing Chen Ping Hu Xinghong Zhang Wenbo Han Yanchun Zhou Science and Technology on Advanced Composite in Special Environments Laboratory Harbin Institute of TechnologyHarbin 150080China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China

Transition metal disilicides are widely used as heating elements and infrared emission ***,the limited intrinsic infrared emissivity and high thermal conductivity are the main limitations to their applications as infrared emission coatings in the thermal protection *** cope with these prob-lems,four medium and high-entropy transition metal disilicides,i.e.,(V_(0.25)Ta_(0.25)Mo_(0.25)W_(0.25))Si_(2)(ME-1),(Nb_(0.25)Ta_(0.25)Mo_(0.25)W_(0.25))Si_(2)(ME-2),(V_(0.2)Nb_(0.2)Ta_(0.2)Mo_(0.2)W_(0.2))Si_(2)(HE-1),and(Cr_(0.2)Nb_(0.2)Ta_(0.2)Mo_(0.2)W_(0.2))Si_(2)(HE-2),were designed and synthesized by spark plasma sintering method using transition metal binary disilicides as *** introduction of multi-elements into transition metal disilicides not only im-proved the infrared emissivity but also reduced the electrical and thermal *** them,(Cr_(0.2)Nb_(0.2)Ta_(0.2)Mo_(0.2)W_(0.2))Si_(2)(HE-2)had the lowest electrical conductivity of 3789 S cm-1,which is over one order of magnitude lower than that of MoSi_(2)(50000 S cm^(-1)),and total infrared emissivity of 0.42 at room temperature,which is nearly double of that of TaSi_(2).Benefiting from low electrical conductivity and phonon scattering due to lattice distortion,the medium and high-entropy transition metal disilicides also demonstrated a significant decline in thermal conductivity compared to their binary *** all samples,HE-2 exhibited the lowest thermal conductivity of 6.4 W m^(−1)K^(−1).The high-entropy tran-sition metal disilicides also present excellent oxidation resistance at high *** improved infrared emissivity,reduced thermal conductivity,excellent oxidation resistance,and lower densities of these medium and high-entropy transition metal disilicides portend that they are promising as infrared emission coating materials for applications in thermal protection systems.

关键词： High-entropy ceramics Transition metal disilicides Electrical conductivity Infrared emissivity Thermal conductivity

来源：评论

学校读者我要写书评

暂无评论

Multiple stimuli-responsive dual-emission material with locked diverse conformations for multimodal anti-counterfeiting and single-molecule white electroluminescence

引用

Chemical Engineering Journal 2025年 513卷

作者： Zhang, BoHua Liu, SiQi Pei, JiangXue Wang, ZhiQiang Chen, Yi Jia, QingYu Hao, ChaoBo Lei, XiPing Wu, ZhaoXin Yang, ZhiYong Zhou, GuiJiang Wang, DongDong School of Chemistry Xi'an Jiaotong University Xi'an710049 China Key Laboratory of Physical Electronics and Devices of Ministry of Education & Shaanxi Key Laboratory of Information Photonic Technique School of Electronic Science and Engineering Xi'an Jiaotong University Xi'an710049 China College of Materials Science and Engineering Xi'an University of Architecture and Technology Xi'an710055 China Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films School of Chemistry Sun Yat-sen University Guangzhou510275 China

The demand for dual-emission organic luminophores with multiple stimuli-responsiveness is rapidly increasing across various fields. However, their design and fabrication still face significant challenges, as these properties typically rely on specific molecular conformations and packing modes. In this work, we report two dual-emission molecules, 6-PTZ-FQ and 7-PTZ-FQ. 6-PTZ-FQ demonstrates fluorescence-thermally activated delayed fluorescence (TADF) dual-emission characteristics in both crystalline and low-concentration amorphous systems, due to the stable coexistence of its two conformational isomers. Owing to the temperature sensitivity of TADF, the crystal of 6-PTZ-FQ exhibits emission color modulation from green (526 nm) to yellow (551 nm) within the temperature range of −30 °C to 60 °C. Additionally, when its crystals are mechanically ground into a powder, it demonstrates high-contrast, reversible mechanochromic luminescence (MCL) behavior, with the emission wavelength shifting from 531 nm to 608 nm. The unique multi-stimulus-responsive behavior of 6-PTZ-FQ endows the material with unparalleled optical information encoding capabilities, demonstrating great potential for high-security anti-counterfeiting applications. Furthermore, both 6-PTZ-FQ and 7-PTZ-FQ exhibit dual-emission behavior in low-concentration amorphous systems, enabling highly efficient single-molecule warm white emission, with a maximum external quantum efficiency (EQE) of 10.2 %. This efficiency ranks among the highest reported for purely organic single-molecule warm-white OLEDs (CIEy © 2025 Elsevier B.V.

关键词： Fluorescence

来源：评论

学校读者我要写书评

暂无评论

Integrated Design of Polysulfide Shuttling and Lithium Dendrite Suppressing Framework: In2o3-In2s3 Embedded Carbon Cloth for Lithium-Sulfur Full Batteries

SSRN

引用

SSRN 2025年

作者： Li, Junting Li, Wenjiang Tian, Yuan Wang, Cheng Institute for New Energy Materials and Low-Carbon Technologies Tianjin Key Laboratory of Advanced Functional Porous Materials School of Materials Science and Engineering Tianjin University of Technology Tianjin300384 China School of Materials Science and Engineering Tianjin University of Technology Tianjin300384 China

The formidable polysulfide shuttling in conjunction with sluggish sulfur redox kinetics on the sulfur cathode and unlimited lithium dendrite growth on the anode severely impede their popularization of lithium-sulfur (Li-S) batteries. Here, the In2O3-In2S3 heterogeneous nanosheets in-situ grown on carbon cloth (In2O3-In2S3@CC) is synthesized by a simple hydrothermal method, which is simultaneously served as an efficient sulfphilic and lithiophilic host to enable stable cycling and boost high-performance Li-S full batteries. Concretely, one side of loading sulfur with In2O3-In2S3@CC acts as S/In2O3-In2S3@CC cathode to strengthen chemical anchoring and propel redox reaction kinetics, while the other side via electrochemical deposition of lithium uses as In2O3-In2S3@CC/Li anode to induce uniform Li deposition. Moreover, the three-dimensional carbon network framework is endowed with long-range effective electron/ion channels, sufficient storage space for sulfur physically confining and homogeneous Li distribution, as well as alleviating the volume change of electrode. As a result, the flexible self-standing dual-functional In2O3-In2S3@CC host significantly suppresses polysulfide shuttling and mitigates lithium dendrite growth, as revealed by theoretical simulations. The assembled Li-S full battery (S/In2O3-In2S3@CC||In2O3-In2S3@CC/Li) exhibits a high discharge capacity of 832.6 mAh g-1 at 1 C with a minimum capacity fading rate of 0.065% per cycle and superb rate capability up to 5 C under sulfur loading of 3 mg cm-2. This work offers insight into the practical application for modified carbon cloth towards advanced energy storage and conversion fields. © 2025, The Authors. All rights reserved.

关键词： Redox reactions

来源：评论

学校读者我要写书评

暂无评论

Enhanced electro-caloric effect and broad temperature span in lanthanum-modified lead zirconate titanate based on a multilayer ceramic approach

引用

Ceramics International 2025年

作者： Li, Xiangyu Ma, Ziyue Li, Suwan Dong, Wen Peng, Biaolin School of Advanced Materials and Nanotechnology Xidian University Xi'an710126 China School of Integrated Circuits & Engineering Research Center for Functional Ceramics & Wuhan National Lab for Optoelectronics & Optical Valley Laboratory Huazhong University of Science and Technology Wuhan430074 China

Amidst environmental concerns over greenhouse gas emissions and noise pollution from vapor compression refrigeration, there is an urgent need for eco-friendly cooling technologies. Electro-caloric (EC) materials, particularly multi-layer EC ceramics, are a crucial pathway to achieving efficient solid-state refrigeration in the future. Currently, research is primarily focused on single-layer ceramic EC materials. While there have been some breakthroughs in multi-layer EC ceramics, challenges such as uniform preparation, small temperature changes, and narrow working temperature ranges still remain. This study addresses the challenge by investigating the EC effect in lead-based relaxor ferroelectric based on a high-quality multilayer ceramic approach. We developed high-performance EC materials by optimizing the composition of Pb0.82La0.12Zr0.55Ti0.45O3 (PLZT) ceramics, achieving a maximum temperature change (ΔTmax) of 1.06 K and an ultra-wide operating temperature range of 106 K at 70 kV cm−1 for the PLZT12/65/35 composition. Additionally, the PLZT12/65/35 multilayer ceramic capacitors obtained 2.82 K ΔTmax by indirect method at 30 °C and 150 kV cm−1, and 1.614 K ΔTmax by direct method. These results not only surpass those of most perovskite-structured ceramics but also indicate the potential of these materials to revolutionize solid-state cooling, offering a sustainable alternative to traditional refrigeration methods. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Vapor compression refrigeration

来源：评论

学校读者我要写书评

暂无评论

Low-amount RuP₂ nanocluster anchored on P, N-codoped carbon with optimized H and H₂O adsorption boost hydrogen evolution in anion-exchange membrane water electrolyzer

引用

Rare Metals 2025年 1-11页

作者： Zhang, Hao Liao, Jia-Jian Chen, Liang Chen, Xin-Yi Yu, Zhi-Peng Yin, Hong Zhang, Jing Hou, Zhao-Hui Huang, Jun-Lin Key Laboratory of Hunan Province for Advanced Carbon-Based Functional Materials College of Chemistry and Chemical Engineering Hunan Institute of Science and Technology Yueyang 414006 China International Iberian Nanotechnology Laboratory (INL) Braga 4715-330 Portugal College of Mechanical Engineering Hunan Institute of Science and Technology Yueyang 414006 China State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha 410082 China

Developing efficient and stable catalysts for the hydrogen evolution reaction (HER) is essential for advancing anion-exchange membrane water electrolyzer (AEMWE) technology. In this study, we present a facile microwave reduction and low-temperature phosphorization strategy to synthesize a highly efficient HER catalyst, comprising P, N-codoped carbon-supported RuP₂ nanocluster (RuP₂@PNC). RuP₂@PNC demonstrates outstanding HER performance, achieving overpotentials of 18 and 44 mV at a current density of 10 mA cm⁻² in alkaline and acidic media, respectively. Furthermore, an AEMWE device utilizing RuP₂@PNC as the cathode catalyst delivers a current density of 0.5 A cm⁻² at a cell voltage of 1.84 V and exhibits remarkable stability over 150 h of operation. Experimental analyses and density functional theory (DFT) calculations reveal that the synergistic effects of P, N-codoped and the unique structure of RuP₂ enhance electron transfer between Ru and the support, optimize the electronic structure, and regulate the d–band center of Ru. These features improve water adsorption, weaken the Ru–H binding strength, and facilitate efficient H₂ desorption, collectively driving the superior HER activity of RuP₂@PNC. This work offers an effective design strategy for high-performance HER catalysts and provides valuable insights for accelerating the development of AEMWE technology. © Youke Publishing Co.,Ltd 2025.

关键词： Anion–exchange membrane water electrolyzer Electron transfer Hydrogen evolution reaction P, N–codoped RuP2 nanocluster

来源：评论

学校读者我要写书评

暂无评论

Blue Light Excitation at Room Temperature in Lead-Free Perovskite Cs2Ag1-xNaxIn1-yBiyCl6 for Optoelectronic Devices Through Enhanced Synergistic Energy Transfer with Yb-Doping

SSRN

引用

SSRN 2025年

作者： Gong, Xiao-Kai Zhang, Xiao-Song Li, Qian Zhao, Xing-Yao Kong, Li-Na Jin, En-Ze Zhou, Bao-Zeng Xu, Jian-Ping Li, Lan School of Materials Science and Engineering Key Laboratory of Display Materials and Photoelectric Devices Ministry of Education Tianjin Key Laboratory for Photoelectric Materials and Devices Tianjin University of Technology Tianjin300384 China Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials & Processing Technology Beijing100076 China School of Integrated Circuit Science and Engineering Tianjin Key Laboratory of Film Electronic & Communicate Devices Tianjin University of Technology Tianjin300384 China

Lead-free perovskites have become a focal point in the quest for non-toxic and stable materials for optoelectronic applications. Despite this interest, achieving blue light emission from lead-free halide double perovskites Cs2AgInCl6 at room temperature remains a significant challenge, hindering their commercial viability. In this study, we address this issue by synthesizing the rare earth lead-free double perovskite Cs2Ag0.6Na0.4In0.8Bi0.2Cl6:Yb, which demonstrates visible/NIR light emission at 598 and 1000 nm upon blue light excitation at room temperature. We show that this excitation stems from complex interactions between energy level splitting induced by Yb and self-trapped exciton energy levels. Notably, we observe that under blue excitation, the photoluminescence intensity increases with temperature. Furthermore, Cs2Ag0.6Na0.4In0.8Bi0.2Cl6:Yb was integrated into a blue light-emitting diode, enhancing the conversion efficiency of GaAs solar cells as a down-shifting layer. Ultimately, this research opens new avenues for developing eco-friendly, efficient materials with significant implications for sustainable technology. © 2025, The Authors. All rights reserved.

关键词： III-V semiconductors

来源：评论

学校读者我要写书评

暂无评论

Blue Light Excitation at Room Temperature in Lead-Free Perovskite Cs2ag0.6na0.4in0.8bi0.2cl6 for Optoelectronic Applications Through Enhanced Synergistic Energy Transfer with Yb-Doping

SSRN

引用

SSRN 2025年

关键词： Perovskite

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：