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g-C3N4 integrated silicon nanoparticle composite for high-performance Li-ion battery anodes 用于高性能锂离子电池阳极的 g-C3N4 集成硅纳米粒子复合材料
IF 3.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-03 DOI: 10.1007/s10853-024-10326-y
Yi Zhong, Bicheng Yu, Lanqing Xu, Yajing Huang, Yongping Zheng, Jiaxin Li, Zhigao Huang

Silicon anodes for Li-ion batteries face challenges due to substantial volume changes and low electrical conductivity. To address these issues comprehensively, we employed electrospinning technology to integrate nitrogen-rich graphitic carbon nitride (g-({hbox {C}_3hbox {N}_4})) with graphene-like structure into carbon nanofibers (CNFs), using melamine as a precursor. This approach resulted in a hierarchical Si@g-({hbox {C}_3hbox {N}_4})/CNF composite anode that mitigates volume expansion and enhances electrical conductivity through continuous g-({hbox {C}_3hbox {N}_4}) layers surrounding Si nanoparticles, improving structural porosity, lithium-ion storage capacity, and cycling stability. Under a high current of 1A (g^{-1}), it exhibits a high reversible capacity and excellent cyclic stability. To further understand and optimize this composite material, we conducted ab initio molecular dynamics simulations to probe the structural and dynamical properties during lithiation. The results revealed that g-({hbox {C}_3hbox {N}_4}) significantly enhances capacity and stability by minimizing side reactions, suppressing irreversible capacity loss via SEI film growth regulation, and improving interfacial electrochemical reaction kinetics. Moreover, we introduced cobalt nanoparticles into the composite structure, which effectively suppressed side reactions, facilitated lithium-ion diffusion, and thereby enhanced overall electrochemical performance. Even under a substantial current of 2A (g^{-1}), both the specific capacity and cycle life have been significantly enhanced. The combination of these strategies enables silicon anodes with ultra-long-cycling stability, paving the way for practical applications in high-energy lithium-ion batteries.

由于体积变化大和导电率低,锂离子电池的硅阳极面临着挑战。为了全面解决这些问题,我们采用电纺丝技术,以三聚氰胺为前驱体,将具有类石墨烯结构的富氮石墨氮化碳(g-({hbox {C}_3hbox {N}_4})整合到碳纳米纤维(CNFs)中。这种方法产生了一种分层的 Si@g-({box {C}_3hbox {N}_4})/CNF 复合负极,通过围绕硅纳米颗粒的连续 g-({box {C}_3hbox {N}_4}) 层缓解了体积膨胀并增强了导电性,从而提高了结构孔隙率、锂离子存储容量和循环稳定性。在 1A (g^{-1})的大电流下,它表现出很高的可逆容量和出色的循环稳定性。为了进一步了解和优化这种复合材料,我们进行了ab initio分子动力学模拟,以探究锂化过程中的结构和动力学特性。结果表明,g-({hbox {C}_3hbox {N}_4})能最大限度地减少副反应,通过 SEI 膜生长调节抑制不可逆容量损失,并改善界面电化学反应动力学,从而显著提高容量和稳定性。此外,我们还在复合结构中引入了钴纳米颗粒,从而有效抑制了副反应,促进了锂离子扩散,从而提高了整体电化学性能。即使在 2A (g^{-1})的大电流下,比容量和循环寿命也得到了显著提高。这些策略的结合使硅阳极具有超长循环稳定性,为高能锂离子电池的实际应用铺平了道路。
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引用次数: 0
Preparation and physical properties of basalt fiber-reinforced silica aerogels 玄武岩纤维增强型二氧化硅气凝胶的制备与物理性质
IF 3.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-02 DOI: 10.1007/s10853-024-10377-1
Zhao Xue, Ziwei Liu, Yanhuai Ding

With increasing demand for high-performance materials in modern industry, lightweight, high-strength, and excellent thermal insulation materials have become a hot topic of research. Basalt fibers, due to their excellent mechanical properties and temperature resistance, are widely regarded as an ideal choice for reinforcing materials. This study aims to prepare basalt fiber-reinforced silica aerogels and conduct an in-depth study of its properties. Silica aerogel with a nano-porous structure was successfully prepared using the sol–gel process, and it was reinforced with basalt fibers. The study investigated the effects of different amounts of basalt fiber on the mechanical properties, thermal stability, and thermal insulation performance of the composite aerogels. The results show that the addition of basalt fibers significantly improved the compressive strength of the composite material while maintaining the low thermal conductivity characteristic of the aerogel. This study provides a new approach for the development of high-performance thermal insulation materials and lays the foundation for the application of basalt fibers in the field of aerogels.

随着现代工业对高性能材料的需求日益增长,轻质、高强度和优异的隔热材料已成为研究的热点。玄武岩纤维因其优异的机械性能和耐温性能,被广泛认为是增强材料的理想选择。本研究旨在制备玄武岩纤维增强二氧化硅气凝胶,并对其性能进行深入研究。采用溶胶-凝胶工艺成功制备了具有纳米多孔结构的二氧化硅气凝胶,并用玄武岩纤维对其进行了增强。研究考察了不同用量的玄武岩纤维对复合气凝胶机械性能、热稳定性和隔热性能的影响。结果表明,在保持气凝胶低导热率特性的同时,添加玄武岩纤维能显著提高复合材料的抗压强度。这项研究为开发高性能隔热材料提供了一种新方法,并为玄武岩纤维在气凝胶领域的应用奠定了基础。
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引用次数: 0
Surface microstructure and corrosion resistance characterization of Mg-based amorphous alloys 镁基非晶合金的表面微观结构和耐腐蚀性表征
IF 3.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-02 DOI: 10.1007/s10853-024-10388-y
Peng Wang, Yipei Mao, Xinyi Zhou, Mingming Wang, Meifeng He

Mg-based amorphous alloys have broad applications due to disordered atomic structure, thermal stability, crystallinity, low elastic modulus and high strength. In the present study, Mg–Ni–Gd–Yb–Ag alloys were prepared by vacuum arc melting combined with copper roll melt spinning. The addition of trace amounts of ytterbium (Yb) improved the corrosion resistance of Mg73-XNi15Gd10YbXAg2 (x = 2,4,6,8 at.%). Electrochemical experiments, immersion tests and analysis of corrosion products by XPS and EDS showed that Mg67Ni15Gd10Yb6Ag2 exhibited the best corrosion resistance with an Ecorr of − 968 mV and an Icorr of 5.93 µA/cm2. The superior corrosion performance was attributed to the presence of corrosion passivation films comprising MgO, Mg(OH)2, Ni(OH)2, Ag2O, AgCl, Ca5(PO4)3(OH), as well as rare-earth oxides Gd2O3 and Yb2O3. These compounds efficiently shield the matrix, and the microstructure corrosion mechanism of Mg–Ni–Gd–Yb–Ag involves a cyclic process that includes surface film layer dissolution, matrix corrosion and film layer regeneration, leading to oxide attachment. The addition of the appropriate amount of rare-earth element Yb to Mg-based amorphous alloys can improve the corrosion resistance, thereby increasing the application prospects of alloys.

Graphical Abstract

镁基非晶合金具有无序原子结构、热稳定性、结晶性、低弹性模量和高强度等特点,因此应用广泛。本研究采用真空电弧熔炼结合铜辊熔融纺丝法制备了 Mg-Ni-Gd-Yb-Ag 合金。微量镱(Yb)的加入提高了 Mg73-XNi15Gd10YbXAg2 (x = 2,4,6,8 at.%)的耐腐蚀性。电化学实验、浸泡测试以及 XPS 和 EDS 对腐蚀产物的分析表明,Mg67Ni15Gd10Yb6Ag2 的耐腐蚀性能最好,其 Ecorr 为 - 968 mV,Icorr 为 5.93 µA/cm2。优异的耐腐蚀性能归功于由 MgO、Mg(OH)2、Ni(OH)2、Ag2O、AgCl、Ca5(PO4)3(OH) 以及稀土氧化物 Gd2O3 和 Yb2O3 组成的腐蚀钝化膜。这些化合物能有效地屏蔽基体,Mg-Ni-Gd-Yb-Ag 的微结构腐蚀机理涉及一个循环过程,包括表面膜层溶解、基体腐蚀和膜层再生,从而导致氧化物附着。在镁基非晶合金中添加适量的稀土元素 Yb 可以提高合金的耐腐蚀性,从而增加合金的应用前景。
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引用次数: 0
Superhydrophobic thermoplastic polyurethane/SiO2 sponge with dual-layer porous structure for summer radiative cooling and winter thermal insulation 具有双层多孔结构的超疏水热塑性聚氨酯/二氧化硅海绵,用于夏季辐射降温和冬季隔热
IF 3.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-02 DOI: 10.1007/s10853-024-10378-0
Yuan-Yuan Qu, Chao-Hua Xue, Bing-Ying Liu, Chao-Qun Ma, Xiao-Jing Guo, Yuan-Yuan Zhu, Hui-Di Wang, Jun Cheng, Jing Li, Hong‑Wei Wang, Fu-Quan Deng

Radiative cooling without using electricity is a green way for air-conditioning. However, most previously reported radiative cooling materials persist in cooling at low temperatures, resulting in added heating demand. This study presents a dual-layer porous superhydrophobic thermoplastic polyurethane/SiO2 (S-TPU/SiO2) sponge with a synergistic effect of radiative cooling and heat insulation. The S-TPU/SiO2 sponge exhibits an average reflectance of 94.5% in the solar band (0.3–2.5 μm), average emissivity of 96.8% in the atmospheric transparent window (8–13 μm), low thermal conductivity of 0.066 W/(mK) and excellent superhydrophobicity with contact angle of 153.4°. During summer, the S-TPU/SiO2 sponge achieves daytime cooling of up to 12.4 °C, maintaining excellent cooling. While in winter, it provides warming of 0.4 °C at night, effectively mitigating overcooling in cold environment. Additionally, the dual-layer porous structure made the sponge superior to common porous materials in mechanical properties with exceptional resilience, which opens up great potential applications in areas such as outdoor seat cushions and building envelope structures.

Graphical abstract

不使用电力的辐射冷却是一种绿色空调方式。然而,之前报道的大多数辐射制冷材料在低温下仍能持续制冷,从而导致额外的供热需求。本研究提出了一种双层多孔超疏水热塑性聚氨酯/二氧化硅(S-TPU/SiO2)海绵,具有辐射冷却和隔热的协同效应。S-TPU/SiO2 海绵在太阳光波段(0.3-2.5 μm)的平均反射率为 94.5%,在大气透明窗口(8-13 μm)的平均发射率为 96.8%,导热系数低至 0.066 W/(mK),并具有接触角为 153.4°的优异超疏水性能。在夏季,S-TPU/SiO2 海绵可在白天制冷高达 12.4 °C,保持良好的制冷效果。而在冬季,它能在夜间提供 0.4 °C的升温,有效缓解寒冷环境中的过冷现象。此外,双层多孔结构使该海绵的机械性能优于普通多孔材料,并具有优异的回弹性,这为其在户外座垫和建筑围护结构等领域的应用提供了巨大的潜力。
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引用次数: 0
Microstructure and mechanical properties of Stellite 6 alloy coating metallurgically bonded to 304 stainless steel by DED-LB technology 采用 DED-LB 技术冶金结合到 304 不锈钢上的 Stellite 6 合金涂层的微观结构和机械性能
IF 3.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-02 DOI: 10.1007/s10853-024-10359-3
Lulu Li, Chenxi Liu, Zongqing Ma, Qianying Guo

With low cost and excellent performance, 304 stainless steel has been widely used in construction, automobile manufacturing and other industrial fields. However, the low hardness and poor wear resistance will mark it prone to premature failure in service. To solve this problem, single-, double, and eight-layer coatings of Stellite 6 Co-based alloy were successfully deposited on 304 substrate subfaces by laser-based directed energy deposition technology in this study. The microstructure evolution of the deposited coatings and their interfaces with 304 substrate were investigated with their corresponding mechanical properties being discussed. The results show that the deposited coating is mainly composed of γ-Co dendrite and Cr7C3, Cr23C6 inter-dendrites. Additionally, the ratio of temperature gradient and solidification rate could decrease from the bottom to the top of the coating, which promoted the transformation of the grains of the coating layers from cellular at the bottom to large columnar with fine equiaxial ones at the top. Therefore, the microhardness could increase gradually from the substrate/coating interface to coating due to the refined microstructure, and the maximum value was 561.5 HV. The wear resistance of the well metallurgically bonded coating has also been improved, and the wear mechanism changes from adhesive wear of the substrate to abrasive wear.

Graphical abstract

304 不锈钢成本低、性能优越,已被广泛应用于建筑、汽车制造和其他工业领域。然而,304 不锈钢硬度低、耐磨性差,在使用中容易过早失效。为解决这一问题,本研究采用激光定向能沉积技术在 304 基材表面成功沉积了单层、双层和八层 Stellite 6 Co 基合金涂层。研究了沉积涂层的微观结构演变及其与 304 基材的界面,并讨论了其相应的力学性能。结果表明,沉积涂层主要由γ-Co枝晶和Cr7C3、Cr23C6间枝晶组成。此外,温度梯度和凝固速率的比值从涂层底部到顶部逐渐减小,促进了涂层晶粒从底部的蜂窝状转变为顶部的大柱状和细小的等轴晶粒。因此,由于微观结构的细化,显微硬度可以从基体/涂层界面到涂层逐渐增加,最大值为 561.5 HV。冶金结合良好的涂层的耐磨性也得到了改善,磨损机理从基体的粘着磨损转变为磨料磨损。
{"title":"Microstructure and mechanical properties of Stellite 6 alloy coating metallurgically bonded to 304 stainless steel by DED-LB technology","authors":"Lulu Li,&nbsp;Chenxi Liu,&nbsp;Zongqing Ma,&nbsp;Qianying Guo","doi":"10.1007/s10853-024-10359-3","DOIUrl":"10.1007/s10853-024-10359-3","url":null,"abstract":"<div><p>With low cost and excellent performance, 304 stainless steel has been widely used in construction, automobile manufacturing and other industrial fields. However, the low hardness and poor wear resistance will mark it prone to premature failure in service. To solve this problem, single-, double, and eight-layer coatings of Stellite 6 Co-based alloy were successfully deposited on 304 substrate subfaces by laser-based directed energy deposition technology in this study. The microstructure evolution of the deposited coatings and their interfaces with 304 substrate were investigated with their corresponding mechanical properties being discussed. The results show that the deposited coating is mainly composed of γ-Co dendrite and Cr<sub>7</sub>C<sub>3</sub>, Cr<sub>23</sub>C<sub>6</sub> inter-dendrites. Additionally, the ratio of temperature gradient and solidification rate could decrease from the bottom to the top of the coating, which promoted the transformation of the grains of the coating layers from cellular at the bottom to large columnar with fine equiaxial ones at the top. Therefore, the microhardness could increase gradually from the substrate/coating interface to coating due to the refined microstructure, and the maximum value was 561.5 HV. The wear resistance of the well metallurgically bonded coating has also been improved, and the wear mechanism changes from adhesive wear of the substrate to abrasive wear.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":645,"journal":{"name":"Journal of Materials Science","volume":"59 42","pages":"20012 - 20027"},"PeriodicalIF":3.5,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the influence of porosity and medium flow on the corrosion behavior of sheet-gyroid porous structures formed by LPBF 孔隙率和介质流动对 LPBF 形成的片状姬多孔结构腐蚀行为的影响研究
IF 3.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-01 DOI: 10.1007/s10853-024-10371-7
Xiu Ye, Xiaojie Shi, Xiaojin Miao, Peipei Lu, Meiping Wu

In this paper, the corrosion resistance of sheet-gyroid porous structures with different porosities formed by LPBF under static and dynamic conditions was studied, and the mechanism of influence of medium flow on corrosion resistance was explored based on CFD simulation. It was found that the corrosion resistance of porous structures decreased with the increase in porosity in static and dynamic environments, which was mainly related to the increase in forming defects and the decrease in forming quality as the wall thickness of porous structures decreased with the increase in porosity. Under dynamic electrolyte conditions, the wall shear stress generated by the flowing medium on the surface of the porous structures will reduce the stability of the oxide film and increase the corrosion rate. The porous structures exhibited greater corrosion damage in the dynamic electrolyte solution. Based on CFD simulation analysis, it was found that with the increase in porosity, the channel size of porous structures increased, the curvature decreased, the average wall shear stress decreased, and the influence of medium flow on the corrosion rate of porous structure gradually decreased. The relationship model between average wall shear stress and corrosion rate growth rate was established, which provided data support for the subsequent design of porous structures for bone implantation. During the corrosion process, α-Ti and Ti2Cu phase form micro-galvanic corrosion, and the preferential dissolution of Ti2Cu phase leads to the gradual release of Cu2+, which is conducive to improving the antibacterial performance of Ti–Cu implants.

本文研究了静态和动态条件下 LPBF 形成的不同孔隙率的片状姬状多孔结构的耐腐蚀性能,并基于 CFD 模拟探讨了介质流动对耐腐蚀性能的影响机理。研究发现,在静态和动态环境下,多孔结构的耐腐蚀性随孔隙率的增加而降低,这主要与多孔结构的壁厚随孔隙率的增加而减小,导致成型缺陷增加和成型质量下降有关。在动态电解质条件下,流动介质在多孔结构表面产生的壁面剪应力会降低氧化膜的稳定性,增加腐蚀速率。多孔结构在动态电解质溶液中表现出更大的腐蚀破坏。基于 CFD 模拟分析发现,随着孔隙率的增加,多孔结构的通道尺寸增大,曲率减小,平均壁面剪应力减小,介质流动对多孔结构腐蚀速率的影响逐渐减小。建立了平均壁面剪应力与腐蚀速率增长率的关系模型,为后续骨植入多孔结构的设计提供了数据支持。在腐蚀过程中,α-Ti与Ti2Cu相形成微电蚀作用,Ti2Cu相的优先溶解导致Cu2+逐渐释放,有利于提高Ti-Cu植入体的抗菌性能。
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引用次数: 0
Imprinted Fe–Ni double hydroxide nanorods with high selective protein adsorption capacity 具有高选择性蛋白质吸附能力的印迹铁-镍双氢氧化物纳米棒
IF 3.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-01 DOI: 10.1007/s10853-024-10382-4
Ting Wang, Yanting Lyu, Kehan Zhao, Mudasir Ahmad, Baoliang Zhang

Anchoring more template proteins on the carrier surface is one of the most critical steps in the preparation process of protein-imprinted polymers. Inspired by the stable interactions between metal ions and proteins, high external surface iron-nickel double hydroxides (Fe–Ni LDH) derived from metal–organic framework were selected as carriers to develop high-performance surface bovine serum albumin (BSA) imprinted iron-nickel double hydroxides nanorods (Fe–Ni LDH@MIP). A hexagonal hollow structure Fe–Ni LDH was synthesized with nanosheets stacked on the surface by etching MIL-88A with Ni2+. The etching of Ni2+ increased the surface roughness of MIL-88A and the rough surface of the carrier was conducive to improving the anchorage amount of BSA, thus providing more effective imprinting sites. Controlled coating of the imprinted polymer layer on the surface of Fe–Ni LDH was obtained by aqueous phase precipitation polymerization. The protein adsorption amount reached 329.8 ± 7.8 mg/g in 60 min with an imprinting factor of 2.86. Fe–Ni LDH@MIP also demonstrated excellent and specific recognition ability in the separation of mixed proteins and fetal bovine serum (FBS) and had good adsorption selectivity, whose adsorption capacity only decreased by 11.5% after 7 adsorption–desorption cycles. In short, Fe–Ni LDH@MIP has great potential to apply in the separation and purification of biomolecules.

Graphical abstract

在载体表面锚定更多的模板蛋白质是制备蛋白质压印聚合物过程中最关键的步骤之一。受金属离子与蛋白质之间稳定相互作用的启发,研究人员选择了金属有机框架衍生的高外表面铁镍双氢氧化物(Fe-Ni LDH)作为载体,开发了高性能表面牛血清白蛋白(BSA)印迹铁镍双氢氧化物纳米棒(Fe-Ni LDH@MIP)。通过用 Ni2+ 对 MIL-88A 进行蚀刻,合成了六方空心结构的铁镍 LDH,其表面堆叠了纳米片。Ni2+ 的蚀刻增加了 MIL-88A 的表面粗糙度,粗糙的载体表面有利于提高 BSA 的锚定量,从而提供更有效的压印位点。通过水相沉淀聚合法在铁镍 LDH 表面获得了可控的印迹聚合物涂层。蛋白质吸附量在 60 分钟内达到 329.8 ± 7.8 mg/g,压印因子为 2.86。Fe-Ni LDH@MIP 在分离混合蛋白和胎牛血清(FBS)时也表现出了优异的特异性识别能力和良好的吸附选择性,其吸附容量在 7 次吸附-解吸循环后仅下降了 11.5%。总之,Fe-Ni LDH@MIP 在生物大分子的分离纯化方面具有很大的应用潜力。
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引用次数: 0
Micromechanical testing and microstructure analysis of as-welded and post-weld heat-treated Ti-6Al-4V alloy 焊接前和焊接后热处理 Ti-6Al-4V 合金的微机械测试和微结构分析
IF 3.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-01 DOI: 10.1007/s10853-024-10348-6
Yu Lu, Richard Turner, Chizhou Fang, Feng Wang, Jeffery Brooks, Biao Cai, Hector Basoalto

The microstructural evolutions and variations in mechanical performance of electron beam welded (EBW) Ti-6Al-4V (Ti64) alloy have been investigated. The effects of heat treatment on the microstructure of welded samples have been studied after post-welding solution treatment and ageing. The martensitic phase ({alpha }{prime}) has been confirmed using transmission electron microscopy (TEM). Electron backscatter diffraction (EBSD) has been used to investigate the phase and grain morphology. Results showed that the martensitic α′ phase coarsened, the size of heat-affected zone (HAZ) changed and grains in the base materials (BMs) had grown after the post-weld heat treatments (PWHT). The tensile behaviour of electron beam welded Ti64 has been investigated using in situ tensile testing monitored by optical microscopy. The deformation and failure were directly revealed during the in situ tensile process. Results showed that the EBW Ti64 samples have different failure locations after receiving different post-weld heat treatments. The relationship between the post-weld heat treatments, microstructural evolution and mechanical properties of EBW Ti64 were investigated. Thermodynamic databases were used to predict mechanical properties—including the yield strengths—of the titanium alloy for different grain sizes, representing different post-weld heat treatment operations, and these were embedded into a finite element modelling framework to simulate the tensile testing specimens to understand the mechanical fields experienced such as stresses and strains, just prior to failure.

研究了电子束焊接(EBW)Ti-6Al-4V(Ti64)合金的微观结构演变和机械性能变化。在焊后固溶处理和时效处理之后,研究了热处理对焊接样品微观结构的影响。使用透射电子显微镜(TEM)确认了马氏体相({alpha }{prime})。电子反向散射衍射(EBSD)被用来研究相和晶粒形态。结果表明,焊后热处理(PWHT)后,马氏体α′相变粗,热影响区(HAZ)尺寸发生变化,母材(BMs)中的晶粒长大。利用光学显微镜监测的原位拉伸试验研究了电子束焊接 Ti64 的拉伸行为。在原位拉伸过程中,变形和失效被直接揭示出来。结果表明,EBW Ti64 样品在接受不同的焊后热处理后,其失效位置各不相同。研究了 EBW Ti64 焊后热处理、微结构演变和力学性能之间的关系。利用热力学数据库预测了不同晶粒大小的钛合金的机械性能(包括屈服强度),代表了不同的焊后热处理操作,并将其嵌入有限元建模框架,模拟拉伸试验试样,以了解失效前所经历的应力和应变等机械场。
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引用次数: 0
Impact of anion adsorption on the determination of the basic site concentration of activated carbons by a reaction with different acids 阴离子吸附对通过与不同酸反应确定活性炭碱性位点浓度的影响
IF 3.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-01 DOI: 10.1007/s10853-024-10370-8
Haotong Ma, Songlin Zuo, Nannan Cui, Shanshan Wang

The basicity of activated carbon materials is derived from basic sites. The concentration of basic sites is fundamental to understanding their properties and can usually be determined by simply reacting with acids. Herein, we measured the basic site concentrations of steam-, carbon dioxide- and ammonia-activated basic carbon materials by reacting with acidic HCl, NaHSO4 and H2SO4 solutions. It was found that the values determined using HCl solution were unexpectedly much lower than those using H2SO4 or NaHSO4, with the H2SO4 and NaHSO4 results being similar, independent of the species of activated carbon. Adsorption experiments verified that this huge discrepancy was caused by apparent adsorption of anions by the activated carbon due to the establishment of an electric double layer between the carbon surface and solution. The further analysis revealed that the adsorption of Cl is governed by electrostatic and molecular interaction forces, while adsorption of SO42− or HSO4 is mainly dependent on electrostatic forces, leading to apparent adsorption of Cl under neutral conditions. The introduction of nitrogen-containing functionality favors adsorption of anions from neutral and acidic solutions. These findings provided new insight into the quantitative analysis of basic activated carbon materials and their electrochemical, environmental and catalytic applications.

Graphical abstract

活性炭材料的碱性来自碱性位点。碱性位点的浓度是了解其性质的基础,通常只需与酸反应即可确定。在此,我们通过与酸性盐酸、NaHSO4 和 H2SO4 溶液反应,测量了蒸汽、二氧化碳和氨水活化的碱性碳材料的碱性位点浓度。结果发现,使用 HCl 溶液测定的数值出乎意料地远远低于使用 H2SO4 或 NaHSO4 测定的数值,H2SO4 和 NaHSO4 的结果相似,与活性炭的种类无关。吸附实验验证了这一巨大差异是由于活性炭表面与溶液之间建立了电双层,阴离子被活性炭明显吸附所致。进一步的分析表明,Cl- 的吸附受静电力和分子相互作用力的支配,而 SO42- 或 HSO4- 的吸附主要依赖于静电力,从而导致 Cl- 在中性条件下的表观吸附。含氮官能团的引入有利于中性和酸性溶液中阴离子的吸附。这些发现为碱性活性炭材料的定量分析及其电化学、环境和催化应用提供了新的视角。
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引用次数: 0
Review: recent progress in high performance graphene fibers-fabrication, characterization and perspectives 综述:高性能石墨烯纤维的最新进展--制备、表征和展望
IF 3.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-31 DOI: 10.1007/s10853-024-10194-6
Fei Ye, Tiehu Li, Yuhui Liu, Jiahe Chen, Shaoheng Wu, Amir Zada, Yongkang Han, Yiting Sun, Alei Dang

Graphene fibers (GFs), assembled from graphene-based building blocks, have received considerable attention both from academia and industry due to their intriguing features of high specific surface area, lightweight, easy functionalization, excellent mechanical, electrical and thermal properties. Herein, we have summarized current research status of GFs in terms of their latest fabrication techniques, characterization methods and reduction processes. Wet and dry spinning, dimension-confined hydrothermal strategy, electrophoretic self-assembly, and film conversion fabrication techniques are mainly discussed to optimize the best fabrication conditions. Moreover, various characterization techniques and reduction processes of GFs are also elaborated in detail. Finally, a perspective of the future development and applications of GFs have been given a separate portion in this review.

石墨烯纤维(GFs)由石墨烯基构件组装而成,具有比表面积高、重量轻、易于功能化、机械、电气和热性能优异等引人入胜的特点,因此受到学术界和工业界的广泛关注。在此,我们从石墨烯的最新制造技术、表征方法和还原工艺等方面总结了石墨烯的研究现状。主要讨论了湿法和干法纺丝、尺寸限定水热策略、电泳自组装和薄膜转换制备技术,以优化最佳制备条件。此外,还详细阐述了 GF 的各种表征技术和还原过程。最后,本综述还对 GFs 的未来发展和应用进行了展望。
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Journal of Materials Science
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