检索结果-内蒙古大学图书馆

New Hexafunctional Epoxy Prepolymer: Innovation Structure for Corrosion Inhibition

学校读者我要写书评

暂无评论

Journal of Bio- and Tribo-Corrosion 2024年第3期10卷 1-18页

作者： El-Aouni, Naoual Dagdag, Omar El Amri, Abdeslam Kim, Hansang Dkhireche, Nadia Elbachiri, Abderrahim Berdimurodov, Elyor Berisha, Avni Rafik, Mohamed Aliev, Nizomiddin Laboratory of Organic Chemistry Catalysis and Environment Department of Chemistry Faculty of Sciences University Ibn Tofail BP 242 Kenitra14000 Morocco Department of Mechanical Engineering Gachon University Seongnam13120 Korea Republic of Laboratory of Advanced Materials and Process Engineering Faculty of Sciences Ibn Tofail University BP 242 Kenitra14000 Morocco Royal Naval School University Department—Boulevard Sour-Jdid Casablanca Morocco Chemical and Materials Engineering New Uzbekistan University 54 Mustaqillik Ave. Tashkent100007 Uzbekistan University of Tashkent for Applied Sciences Str. Gavhar 1 Tashkent100149 Uzbekistan Faculty of Chemistry National University of Uzbekistan Tashkent100034 Uzbekistan Department of Chemistry Faculty of Natural and Mathematics Science University of Prishtina Prishtina10000 Tashkent State University of Economics Tashkent100066 Uzbekistan

The corrosion of metals is a pervasive issue across various industries, leading to significant economic losses. The development of new protective agents, particularly organic inhibitors, is a promising approach for mitigating corrosion. This study introduces a novel hexafunctional phosphorus epoxy resin, HGTMDAP, as an innovative corrosion inhibitor for metal surfaces in acidic environments. HGTMDAP was synthesized via a two-step reaction involving methylene dianiline and phosphorus trichloride, followed by epichlorohydrin addition. Its structure was confirmed using FTIR, 1H, and 13C NMR techniques. The corrosion inhibition performance was assessed through electrochemical evaluations (EIS, PDP), SEM/EDX analysis for surface characterization, and theoretical simulations (DFT, MC, and MD) to elucidate the adsorption mechanism and interaction with metal surfaces. The HGTMDAP resin demonstrated exceptional corrosion inhibition efficiency, reaching 96.3% at an optimal concentration of 10–3 M. Electrochemical studies validated its role as a mixed-type inhibitor, forming a protective film on the metal surface. Theoretical simulations supported the experimental findings, revealing strong adsorption and interaction mechanisms at the molecular level. This comprehensive approach underscores the potential of HGTMDAP as a highly effective corrosion inhibitor under acidic conditions. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Corrosion inhibitors

Thermal Stability and mechanical Properties of Dual-Phase Amorphous-Nanocrystalline Al-Mo Alloy Films

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Wang, Caixia Wang, Tao Yu, Shouming Cao, Linlin Zhang, Guojun School of Materials Science & Engineering Xi’an University of Technology Xi’an710048 China School of Mechanical Engineering Harbin Institute of Petroleum Harbin150028 China

Dual-phase amorphous-nanocrystalline Al100-xMox (x=20, 26, 30) alloy films prepared by magnetron sputtering were studied in terms of thermally induced microstructural evolution and mechanical properties via annealing at 550°C. It was observed that, after annealing, the Al80Mo20 alloy film crystallized completely and mainly contained intermetallic Al12Mo phase along with apparent grain coarsening, which resulted in significant increase of surface roughness and deterioration of hardness. In contrast, the annealed Al74Mo26 and Al70Mo30 alloy films still maintained stable dual-phase amorphous-nanocrysatlline structure and precipitated Al8Mo3 nano-grains dispersed in amorphous matrix uniformly. The excellent thermal stability of dual-phase amorphous-nanocrystalline Al74Mo26 and Al70Mo30 alloy films stem from the small driving force for precipitated Al8Mo3 nano-grain growth, as well as benefit from effect of diffusion field impingement. After annealing, the surface roughness of Al74Mo26 and Al70Mo30 alloy films remained unchanged of 7.5 nm and the hardness and elastic modulus of them were as high as 13 and 210 GPa which enhanced about 50% and 24% than before, respectively. © 2023, The Authors. All rights reserved.

关键词： Aluminum alloys

Enhanced Thermoelectric Performance of N-Type Bi2s3-Based Nanocomposites Doped Zero-Dimensional C60 Nanodots

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Bai, Yaoning Wang, Weiyao Ouyang, Taoyuan Li, Xinru Yan, Yuwei Wang, Xu Jiang, Xiaodi Gao, Wen Wang, Zichen Cai, Jinming Ge, Zhenhua Cai, Xiaoming Tan, Honglin Faculty of Materials Science and Engineering Kunming University of Science and Technology Yunnan Kunming650000 China Faculty of Mechanical and Electrical Engineering Kunming University of Science and Technology Yunnan Kunming650000 China

Bi2S3 is one of the most inexpensive thermoelectric materials in the medium temperature region, but its low thermoelectric figure of merit (ZT) further limits its commercialization. In this work, we use a simple hydrothermal method to dope functionalized fullerene (C60) into Bi2S3 to optimize its thermoelectric properties. Due to the manipulation of phonons and electrons by C60 nanodots on Bi2S3-based nanomaterials, the electrical and thermal conductivity of Bi2S3-based nanocomposites are optimized to varying degrees. The highest power factor (PF) of Bi2S3/C60 nanocomposites is up to 181μW·m-1·K-2, and the lowest thermal conductivity is 0.17W m-1·K-2. Ultimately, the ZT value of Bi2S3/C60 (10ml) nanocomposites reached 0.38, nearly a threefold improvement over the pure Bi2S3. In this study, we synthesized Bi2S3/C60 nanocomposite with excellent thermoelectric properties by hydrothermal method with low cost and simple operation，which further expands the application range of Bi2S3-based thermoelectric materials. © 2023, The Authors. All rights reserved.

关键词： Bismuth compounds

P2_(1)3 BN:a novel large-cell boron nitride polymorph

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2021年第12期73卷 159-167页

作者： Qing-Yang Fan Nan Wu Shuai-Ming Chen Li Jiang Wei Zhang Xin-Hai Yu Si-Ning Yun College of Information and Control Engineering Xi'an University of Architecture and TechnologyXi'an 710055China Shaanxi Key Laboratory of Nano Materials and Technology Xi'an 710055China School of Microelectronics Xidian UniversityXi'an 710071China Department of Mechanical and Electrical Engineering Hetao CollegeBayannurInner Mongolia 015000China Functional Materials Laboratory(FML) School of Materials Science and EngineeringXi'an University of Architecture and TechnologyXi'an 710055China

A new boron nitride polymorph,P2_(1)3 BN(space group:P2_(1)3),is investigated by first-principles calculations,including its structural properties,stability,elastic properties,anisotropy and electronic *** is found that the new boron nitride polymorph P2_(1)3 BN is mechanically,dynamically and thermodynamically *** bulk modulus(B),shear modulus(G)and Young’s modulus of P2_(1)3 BN are 91 GPa,41 GPa and 107 GPa,respectively,all of which are larger than that of Y carbon and TY *** comparing with c-BN,the Young’s modulus,shear modulus and Poisson’s ratio of P2_(1)3 BN show tiny anisotropy in the(001),(010),(100)and(111)*** the same time,in contrast with most boron nitride polymorphs,P2_(1)3 BN is a semiconductor material with a smaller band gap of 1.826 *** Debye temperature and the anisotropic sound velocities of P2_(1)3 BN are also investigated in this work.

关键词： boron nitride polymorph elastic properties anisotropy electronic properties

Microstructure development and biodegradation behavior of additively manufactured Mg-Zn-Gd alloy with LPSO structure

学校读者我要写书评

暂无评论

Journal of materials science & Technology 2023年第13期144卷 1-14页

作者： Youwen Yang Chenrong Ling Yageng Li Shuping Peng Deqiao Xie Lida Shen Zongjun Tian Cijun Shuai Institute of Additive Manufacturing Jiangxi University of Science and TechnologyNanchang 330013China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China The Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education Xiangya HospitalCentral South UniversityChangsha 410078China NHC Key Laboratory of Carcinogenesis of Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine Cancer Research InstituteSchool of Basic Medical ScienceCentral South UniversityChangsha 410013China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China

Biodegradable magnesium(Mg)alloy has been considered as a new generation of orthopedic implant ***,local corrosion usually occurs since the severe micro-galvanic behavior amongα-Mg and precipitates,and results in too rapid *** this study,porous Mg-Zn-Gd part was fabricated using laser additive manufacturing combined with solution heat *** heat treatment,the precipitatedβ-(Mg,Zn)_(3) Gd phase dissolved inα-Mg,and reduced the energy threshold of stacking faults on basal planes,which finally triggered the formation of long period stacking ordered(LPSO)*** LPSO phases owned minor potential difference withα-Mg,thus causing less micro-galvanic corrosion ten-dency as compared toβ-(Mg,Zn)_(3) Gd *** importantly,they were uniformly distributed within theα-Mg grains and showed different orientations between adjacent *** a result,the LPSO-reinforced Mg-Zn-Gd tended to expand laterally during corrosion evolution,and achieved uniform degradation with a considerably reduced degradation rate of 0.34 mm/***,in-vitro cell tests further proved its favorable *** work highlighted the additively manufactured Mg-Zn-Gd with LPSO structure showed great potential for orthopedic application.

关键词： Additive manufacturing Mg alloy LPSO structure Biodegradation behavior Biocompatibility

Surface Doping *** Doping of Cathode materials for Lithium-Ion Batteries:A Review

学校读者我要写书评

暂无评论

Electrochemical Energy Reviews 2022年第4期5卷 254-285页

作者： Huaming Qian Haoqi Ren Ying Zhang Xianfeng He Wenbin Li Jingjing Wang Junhua Hu Hong Yang Hirbod Maleki Kheimeh Sari Yu Chen Xifei Li Xi’an Key Laboratory of New Energy Materials and Devices Institute of Advanced Electrochemical Energy and School of Materials Science and EngineeringXi’an University of TechnologyXi’an 710048ShaanxiChina Shaanxi International Joint Research Center of Surface Technology for Energy Storage Materials Xi’an 710048ShaanxiChina Department of Mechanical and Materials Engineering University of Western OntarioLondonOntario N6A 5B9Canada State Center for International Cooperation On Designer Low‑Carbon and Environmental Materials(CDLCEM) Zhengzhou University100 Kexue AvenueZhengzhou 450001China Xi’an Safty Energy Technology Co. LtdXi’an 710005ShaanxiChina

To address the capacity degradation,voltage fading,structural instability and adverse interface reactions in cathode materi-als of lithium-ion batteries(LIBs),numerous modification strategies have been developed,mainly including coating and *** particular,the important strategy of doping(surface doping and bulk doping)has been considered an effective strategy to modulate the crystal lattice structure of cathode ***,special insights into the mechanisms and effectiveness of the doping strategy,especially comparisons between surface doping and bulk doping in cathode materials,are still *** this review,recent significant progress in surface doping and bulk doping strategies is demonstrated in detail by focusing on their inherent differences as well as effects on the structural stability,lithium-ion(Li-ion)diffusion and electrochemical properties of cathode materials from the following mechanistic insights:preventing the exposure of reactive Ni on the surface,stabilizing the Li slabs,mitigating the migration of transition metal(TM)ions,alleviating unde-sired structural transformations and adverse interface issues,enlarging the Li interslab spacing,forming three-dimensional(3D)Li-ion diffusion channels,and providing more active sites for the charge-transfer ***,insights into the correlation between the mechanisms of hybrid surface engineering strategies(doping and coating)and their influences on the electrochemical performance of cathode materials are provided by emphasizing the stabilization of the Li slabs,the enhancement of the surface chemical stability,and the alleviation of TM ion ***,the existing challenges and future perspectives in this promising field are indicated.

关键词： Lithium-ion batteries Cathode materials Surface doping Bulk doping Hybrid surface engineering Structural stability Lithium-ion diffusion

Bead-Like Flexible Zif-67-Derived Co@Carbon Composite Nanofibre Mat for Wideband Microwave Absorption in C-Band

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Xiang, Zichen Song, Zhi Wang, Tiansheng Feng, Menghang Zhao, Yijing Zhang, Qitu Hou, Yi Wang, Lixi College of Materials Science and Engineering Nanjing Tech University Nanjing211816 China Department of Mechanical Engineering National University of Singapore Singapore117575 Singapore

The lightweight and wideband microwave attenuation performance with low-frequency compatibility, has always been desired for advanced microwave absorbing materials. However, most of the current solutions for low-frequency absorption rely on magnetic materials, which is limited by the high-density and narrow absorption bandwidth. Herein, we present a co-electrospinning synthesis strategy to fabricate lightweight and porous Co@C composite nanofibres (Co@CNFs) with bead-like (cubic Co particles embedded in carbon nanofibres) morphology. The continuous and fibrous carbon nanofibres template provides wideband microwave attenuation capacity. And the inserted MOF-derived Co additives further improve the low-frequency absorption performance by inducing magnetic losses, rich interfaces, and enhanced conductivity. The optimized Co@CNFs sample, with a filler loading of only 7.5 wt %, offers the effective absorption bandwidth (EAB) of 3.84 GHz (4.16-8.00 GHz) within C-band at 6.63 mm. At an alternative sample thickness of 2.90 mm, the EAB reaches 6.42 GHz. In addition, the nanofibre mat also demonstrates excellent flexibility according to a 500-time 180° bending test. Furthermore, the broadband absorption matching formula based on the quarter wavelength (λ/4) cancellation theory was also optimized by containing permeability part, which could be served as the guidance for designing lightweight and broadband microwave attenuation fibrous materials that are compatible with low frequency absorption. © 2023, The Authors. All rights reserved.

关键词： Carbon nanofibers

Influence Of External Disturbances on Electron Beam Spot Characteristics of The Large Aspect Ratio Emitter Field Emission Gun

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Li, Qianqian Zeng, Fanguang Ye, Zhihao Ji, Qianyu Ding, He Ding, Pei Ma, Huali Huo, Haibo Yang, Peng Tang, Zhaojun Li, Mingyu School of Materials Science and Engineering Zhengzhou University of Aeronautics Zhengzhou450046 China School of Mechanical Engineering Xi'an Jiaotong University Xi’an710049 China

Quasi-one-dimensional carbon materials such as carbon fiber (CF) have good mechanical, electrical and field emission properties so that they are used as emitters in field emission guns (FEG). Due to the large aspect ratio (LAR) of such materials, it is easy to be affected by external disturbances, which leads to an off-axis deformation of emitter and further causes drift of the electron beam spot (EBS). This greatly reduces the working accuracy of electron gun. In this work, the finite element method (FEM) is used to analyze the harmonic response and EBS characteristics of the FEG with an LAR emitter (LARE-FEG). The results show that when a certain external disturbance is applied, the emitter tip's off-axis displacement increases with the aspect ratio (AR) of CF, which leads to an increase in the EBS drifting range. Particularly, three EBS drifting types are obtained. When the emitter's tip off-axis displacement is between 22.8 μm and 391.1 μm (the range of emitter's AR is 200~600), drift increases the diameter of converging EBS by 17% to 136% compared with drift-free. The research results can provide a technical route for the external disturbance analysis of the LARE-FEG and optimization of the whole machine. © 2023, The Authors. All rights reserved.

关键词： Electron beams

Harnessing the Potential of Coal-Derived Graphene Oxide/Epoxy Nanocomposites: Enhancing Thermal Conductivity and Fracture Toughness

学校读者我要写书评

暂无评论

SSRN 2024年

作者： Lee, Seul-Yi Kim, Seong-Hwang Choi, Won-Jong Mahajan, Roop L. Park, Soo-Jin Department of Chemistry Inha University 100 Inharo Incheon22212 Korea Republic of Department of Mechanical Engineering Department of Materials Science and Engineering Virginia Tech BlacksburgVA24061 United States

The precursor choice significantly shapes graphene oxide (GO) properties. Coal, with its unique molecular structure, is a promising precursor due to graphene-like domains and aliphatic side chains. Using a one-pot process, we synthesized semianthracite coal-derived GO (AC-GO) as a nanofiller in an epoxy matrix, resulting in AC-GO enriched nanocomposites. CGO exhibits a thin sheet-like morphology with dimensions of ~300 nm in width. Our findings indicate remarkable enhancements in thermal conductivity (0.646 at 1.0 wt.% loading) and fracture toughness (6.7 at 0.8 wt.% loading) within AC-GO nanocomposites, with these improvements being 255% and 215%, respectively, over those for the epoxy matrix. Remarkably, they surpass those achieved with graphite-derived GO (Gr-GO) by approximately 112% and 76%, respectively. These improvements can be attributed to the enhanced interactions between oxygen moieties located at the periphery of AC-GO and the fundamental epoxy-amine hardener system within the resin formulation, fostering electron acceptordonor interactions. Furthermore, we introduce a new figure of merit (FOM) combining thermal conductivity and fracture toughness, we offer a design tool for optimal nanofiller loading. The findings of our paper highlight the versatility and unique attributes of AC-GO, promising opportunities in electronics and aerospace industries due to outstanding interfacial properties. © 2024, The Authors. All rights reserved.

关键词： Fracture toughness