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Efficiency of reducing silver ions to silver nanoparticle using carbon dots 利用碳点将银离子还原成银纳米粒子的效率
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-08 DOI: 10.1088/2053-1591/ad72d0
Thi Hoa Le, Chi Thuan Nguyen, Quoc Hien Nguyen, Thai Hoa Tran and Xuan Du Dang
Silver nanoparticles (AgNPs) have been suitably synthesized by reduction of silver ion (Ag+) using carbon dots (CDs) as a reducing agent and polyvinylpyrrolidone (PVP) as a stabilizing agent. The purpose of this study was to clarify the efficiency of reducing agent (CDs) for the synthesis of AgNPs. The CDs and AgNPs have been characterized using UV–vis spectroscopy and transmission electron microscopy (TEM). Additionally, x-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) were also used to characterize CDs. The particle size of CDs and AgNPs was determined by Dynamic light scattering (DLS). The results showed that the CDs with particle size of 4.6 nm could be efficiently reduce silver ion at a sufficient ratio of CDs/silver ion to be 100 ml 1 mM−1. The average size of AgNPs was 41 nm. The results of DLS measurement showed that the Zeta potential of AgNPs was −18, 8 mV. In addition, the duration of 60 min was needed to reduce silver ion completely at ambient temperature. The as-synthesized AgNPs may have a potential for antibacterial application and the other purposes as well namely catalysis, biosensor, electromagnetic coating...
银纳米粒子(AgNPs)是以碳点(CDs)为还原剂,聚乙烯吡咯烷酮(PVP)为稳定剂,通过还原银离子(Ag+)而合成的。本研究的目的是明确还原剂(CDs)在合成 AgNPs 中的效率。使用紫外-可见光谱和透射电子显微镜(TEM)对还原剂(CDs)和 AgNPs 进行了表征。此外,还使用了 X 射线衍射(XRD)和傅立叶变换红外光谱(FT-IR)来表征 CD。通过动态光散射(DLS)测定了 CD 和 AgNPs 的粒度。结果表明,当 CD/银离子的比例达到 100 ml 1 mM-1 时,粒径为 4.6 nm 的 CD 可以有效地还原银离子。AgNPs 的平均粒径为 41 nm。DLS 测量结果表明,AgNPs 的 Zeta 电位为 -18.8 mV。此外,在环境温度下,银离子完全还原需要 60 分钟。所合成的 AgNPs 不仅具有抗菌应用潜力,还可用于其他用途,如催化、生物传感器、电磁涂层......
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引用次数: 0
Dispersion of ZnO or TiO2 nanoparticles onto P. australis stem-derived biochar for highly efficient photocatalytic removal of doxycycline antibiotic under visible light irradiation 将 ZnO 或 TiO2 纳米颗粒分散到蕨类植物茎衍生生物炭上,在可见光照射下高效光催化去除强力霉素抗生素
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-08 DOI: 10.1088/2053-1591/ad7448
Nguyen Thanh Tuoi, Bui Thi Minh Nguyet, Tran Ngoc Tuyen, Pham Khac Lieu, Dinh Quang Khieu and Nguyen Van Hung
Biochar (BC) derived from reed stems was prepared by high-temperature pyrolysis, and two types of ZnO/biochar (ZBC) and TiO2/biochar (TBC) composite materials were synthesized via a simple hydrolysis method. These composites, compared to pure ZnO and TiO2, exhibit not only improved but significantly enhanced crystalline structures and larger specific surface areas. This enhancement in the physical and chemical properties of ZBC and TBC composites is a crucial aspect of our research, as it leads to a distinct red-shifted absorption edge and excellent visible-light absorption characteristics. The photocatalytic degradation efficiency of ZBC and TBC composite materials, a key finding of our study, was evaluated using doxycycline antibiotic as a simulated pollutant under visible-light irradiation. The results demonstrate a 6.0-fold and 7.3-fold increase in photocatalytic degradation efficiency of ZBC and TBC composites compared to pure ZnO and TiO2, respectively, further underscoring the significance of these enhanced properties. Furthermore, active species trapping experiments reveal that ·OH radicals are the dominant reactive species in the photocatalytic degradation process of doxycycline. A Langmuir–Hinshelwood kinetic model accurately represents this degradation process. Kinetic data indicate that the degradation rate constants (k) of ZBC and TBC catalysts are 4.314 × 10−2 min−1 and 3.416 × 10−2 min−1, respectively. The photocatalysts exhibit no significant decrease in degradation efficiency for ZBC and TBC even after the fourth cycle, indicating their relatively high reusability. These results suggest that ZBC and TBC materials can be used as stable, efficient, cost-effective, and sustainable photocatalytic composite materials for antibiotic-contaminated wastewater treatment.
通过高温热解法制备了从芦苇茎中提取的生物炭(BC),并通过简单的水解法合成了两种类型的 ZnO/生物炭(ZBC)和 TiO2/生物炭(TBC)复合材料。与纯 ZnO 和 TiO2 相比,这些复合材料不仅改善了结晶结构,而且显著提高了比表面积。ZBC 和 TBC 复合材料物理和化学性质的这种增强是我们研究的一个重要方面,因为它导致了明显的红移吸收边缘和优异的可见光吸收特性。我们以多西环素抗生素作为模拟污染物,在可见光照射下对 ZBC 和 TBC 复合材料的光催化降解效率进行了评估,这是我们研究的一项重要发现。结果表明,与纯 ZnO 和 TiO2 相比,ZBC 和 TBC 复合材料的光催化降解效率分别提高了 6.0 倍和 7.3 倍,进一步凸显了这些增强特性的重要性。此外,活性物种捕获实验表明,-OH 自由基是强力霉素光催化降解过程中的主要活性物种。Langmuir-Hinshelwood 动力学模型准确地反映了这一降解过程。动力学数据表明,ZBC 和 TBC 催化剂的降解速率常数(k)分别为 4.314 × 10-2 min-1 和 3.416 × 10-2 min-1。ZBC 和 TBC 光催化剂的降解效率即使在第四个循环后也没有明显下降,这表明它们具有相对较高的重复利用率。这些结果表明,ZBC 和 TBC 材料可作为稳定、高效、经济和可持续的光催化复合材料用于抗生素污染废水的处理。
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引用次数: 0
Simple precipitation synthesis and solar light-driven photocatalytic degradation of Ag3PO4 floating photocatalysts Ag3PO4 漂浮光催化剂的简单沉淀合成和太阳光驱动的光催化降解
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-08 DOI: 10.1088/2053-1591/ad719a
Thi Thu Hien Bui, Pham Tran Anh Nguyen, Thanh Mai Vu, Thi Huong Giang Tran, Thi Kim Chi Tran and Thi Thuong Huyen Tran
A highly efficient and stable photocatalyst, Ag3PO4, was prepared using a simple co-precipitation method at room temperature. The precursors used in this process were AgNO3 and K2HPO4. The resulting Ag3PO4 photocatalyst forms irregularly-shaped spheres with diameters ranging from 300 to 1 μm. The shape of the Ag3PO4 photocatalyst slightly changes when different surfactants (PVA, PVP, PEG) are used. The powdered Ag3PO4 photocatalyst exhibits excellent visible light-driven photocatalytic performance. It is capable of decomposing rhodamine B (RhB) as a model pollutant in just 5 min under visible light irradiation. This performance is quite remarkable. Interestingly, Ag3PO4 floating composite sheets have been achieved using polystyrene (PS) and fumed silica Aerosil 200. After three cycles, the decolorization of RhB dyes remains at 87% with the 30% Ag3PO4@PS/Aerosil 200 sheet. This indicates that the Ag3PO4@PS/Aerosil 200 photocatalyst is highly reusable and stable.
采用简单的共沉淀法,在室温下制备出高效稳定的光催化剂 Ag3PO4。此过程中使用的前驱体是 AgNO3 和 K2HPO4。制得的 Ag3PO4 光催化剂形成不规则球体,直径在 300 到 1 μm 之间。当使用不同的表面活性剂(PVA、PVP、PEG)时,Ag3PO4 光催化剂的形状会略有变化。粉末状的 Ag3PO4 光催化剂具有优异的可见光光催化性能。在可见光照射下,仅用 5 分钟就能分解作为模型污染物的罗丹明 B(RhB)。这一性能相当出色。有趣的是,利用聚苯乙烯(PS)和气相二氧化硅 Aerosil 200 实现了 Ag3PO4 悬浮复合片材。经过三个循环后,30% Ag3PO4@PS/Aerosil 200 片材对 RhB 染料的脱色率保持在 87%。这表明,Ag3PO4@PS/Aerosil 200 光催化剂具有高度的可重复使用性和稳定性。
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引用次数: 0
Effect of addition of Ce and accumulative roll bonding on structure-property of the Mg-Ce-Al hybrid composite and its prediction and comparison using artificial neural network (ANN) approach 添加 Ce 和累积轧制粘接对镁-钴-铝混合复合材料结构-性能的影响以及使用人工神经网络 (ANN) 方法对其进行预测和比较
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-08 DOI: 10.1088/2053-1591/ad7449
Gajanan Anne, Nagaraj Bhat, Vishwanatha H M, Ramesh S, Maruthi Prashanth B H, Priyaranjan Sharma, Aditya Kudva S, C Jagadeesh and Yashwanth Nanjappa
Light alloys play a crucial role in realizing the national strategy for energy conservation and emission reduction, as well as promoting the upgrading of manufacturing industries. Mg/Al composite laminates combine the corrosion resistance and ductility of aluminium alloy with the lightweight characteristics of magnesium alloy. The addition of Ce (rare earth elements) can improve the mechanical properties of magnesium via grain refinement and improve the ductility of the hybrid composites. In the present work, an investigation on addition of Ce into the Mg/Al matrix through Accumulative Roll Bonding (ARB) has been presented. The Mg/Ce/Al hybrid composite consists of Mg-4%Zn alloy and Al 1100 alloy with 0.2% Ce particles added between the dissimilar layers. The changes occurred in the evaluation of microstructure, corrosion and mechanical properties of the Mg/Ce/Al hybrid composite as a result of deformation process and also the addition of Ce have been explicated. The ARB parameters: temperature, rolling speed, percentage reduction, and aging time, have been studied. An increase of about 2.36 times in strength and hardness of the hybrid composite, has been reported. Further, the structure–property relations in the Mg/Ce/Al hybrid composites were aslo predict and compare using machine learning models: Decision Tree and Multi-Layer Perceptron (MLP) models.
轻合金在实现国家节能减排战略和促进制造业升级方面发挥着至关重要的作用。镁铝合金复合层压板兼具铝合金的耐腐蚀性和延展性以及镁合金的轻质特性。添加 Ce(稀土元素)可通过晶粒细化改善镁的机械性能,并提高混合复合材料的延展性。本研究介绍了通过累积轧制粘合(ARB)在镁/铝基体中添加 Ce 的情况。Mg/Ce/Al 混合复合材料由 Mg-4%Zn 合金和 Al 1100 合金组成,在不同层之间添加了 0.2% 的 Ce 颗粒。研究阐述了 Mg/Ce/Al 混合复合材料的微观结构、腐蚀和机械性能评估因变形过程和添加 Ce 而发生的变化。研究了 ARB 参数:温度、轧制速度、减少百分比和老化时间。结果表明,混合复合材料的强度和硬度提高了约 2.36 倍。此外,还使用机器学习模型对 Mg/Ce/Al 混合复合材料的结构-性能关系进行了预测和比较:决策树和多层感知器(MLP)模型。
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引用次数: 0
Effect of Cu content on the microstructure and properties of sintered Fe-0.8C-xCu antifriction materials 铜含量对烧结 Fe-0.8C-xCu 抗摩擦材料微观结构和性能的影响
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-08 DOI: 10.1088/2053-1591/ad72cf
Jiaxin Li, Han Feng, Jianhua Zhang, Pengqi Chen and Jigui Cheng
Ferrous antifriction materials (FAMs) play a crucial role in powder metallurgy. Previous studies have primarily focused on exploring the antifriction properties of Fe-C-Cu materials with low copper content (0–5 wt%), while there have been fewer studies on high copper content FAMs. In this study, to investigate the effect of Cu content on the microstructure and properties of sintered FAMs, Fe-0.8C-xCu (x = 5–25 wt%) materials were prepared by powder metallurgy method. The density, microstructure, mechanical performance, friction and wear properties of the samples were analyzed. The results demonstrated a significant change in the relative density, hardness, friction and wear properties of sintered Fe-0.8C-xCu samples with increasing Cu content. Particularly, the Fe-0.8C-15Cu samples exhibited outstanding properties, with a relative density of 77.8%, a hardness of 43 HRB, crushing strength of 380 MPa, an average friction coefficient of 0.21, and a wear rate of 1.36 × 10−8 mm3 N·mm−1. The primary wear mechanisms of the Fe-0.8C-xCu specimens include abrasive wear, adhesion wear, chafing fatigue, pitting, and oxidation. This study aims to provide an experimental and theoretical basis for the development of ferrous antifriction materials suitable for heavy-load conditions.
黑色金属减摩材料(FAMs)在粉末冶金中起着至关重要的作用。以往的研究主要集中在探索低铜含量(0-5 wt%)的铁-铜-铜材料的减摩性能,而对高铜含量 FAMs 的研究较少。本研究采用粉末冶金法制备了 Fe-0.8C-xCu(x = 5-25 wt%)材料,以探究铜含量对烧结 FAM 的微观结构和性能的影响。分析了样品的密度、微观结构、机械性能、摩擦和磨损性能。结果表明,随着铜含量的增加,烧结的 Fe-0.8C-xCu 样品的相对密度、硬度、摩擦和磨损性能都发生了显著变化。特别是,Fe-0.8C-15Cu 样品表现出卓越的性能,其相对密度为 77.8%,硬度为 43 HRB,压碎强度为 380 MPa,平均摩擦系数为 0.21,磨损率为 1.36 × 10-8 mm3 N-mm-1。Fe-0.8C-xCu 试样的主要磨损机制包括磨料磨损、粘着磨损、摩擦疲劳、点蚀和氧化。这项研究旨在为开发适用于重载条件的黑色减摩材料提供实验和理论依据。
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引用次数: 0
Cluster-spin-glass behavior in new ternary RE2PtGe3 compounds (RE = Tb, Dy, Ho) 新型三元 RE2PtGe3 化合物(RE = Tb、Dy、Ho)中的簇自旋玻璃行为
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-08 DOI: 10.1088/2053-1591/ad7444
L S Litzbarski, M J Winiarski, I Oshchapovsky, P Skokowski, K Synoradzki, T Klimczuk and B Andrzejewski
Two new ternary germanides Tb2Pt1.2Ge2.8, Dy2Pt1.15Ge2.85 and one already known germanium Ho2Pt1.1Ge2.9.were synthesized using an arc melting technique. The obtained samples were investigated by powder x-ray diffraction, which indicated that all of them crystallized in a hexagonal structure with P6/mmm (no. 191) space group. This structure is a disordered variant of the AlB2 aristotype that favors the formation of a spin-glass-like state. The physical properties were examined by measuring magnetic susceptibility, heat capacity and electrical resistance. Experiments indicated that all of the compounds can be classified as cluster-spin-glasses with the freezing temperature of Tf = 12.0 K, Tf = 6.0 K and Tf = 2.9 K for Tb2Pt1.2Ge2.8, Dy2Pt1.15Ge2.85 and Ho2Pt1.1Ge2.9 respectively.
利用电弧熔融技术合成了两种新的三元锗化物 Tb2Pt1.2Ge2.8、Dy2Pt1.15Ge2.85 和一种已知的锗 Ho2Pt1.1Ge2.9。用粉末 X 射线衍射法对所获得的样品进行了研究,结果表明,所有这些样品都结晶成具有 P6/mmm(编号 191)空间群的六边形结构。这种结构是 AlB2 芳构型的无序变体,有利于形成类似自旋玻璃的状态。通过测量磁感应强度、热容量和电阻,研究了这些化合物的物理性质。实验表明,所有化合物都可归类为团簇自旋玻璃,Tb2Pt1.2Ge2.8、Dy2Pt1.15Ge2.85 和 Ho2Pt1.1Ge2.9 的凝固温度分别为 Tf = 12.0 K、Tf = 6.0 K 和 Tf = 2.9 K。
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引用次数: 0
Influence of HSS drill coatings on surface finish and cylindricity of AA6061/C/ZrO2 composite in CNC drilling operations under dry conditions 干燥条件下数控钻孔作业中高速钢钻头涂层对 AA6061/C/ZrO2 复合材料表面光洁度和圆柱度的影响
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-08 DOI: 10.1088/2053-1591/ad7560
Haja Syeddu Masooth P, Jayakumar V, Bharathiraja G and Keno Teshome Mekonnin
This study aims to evaluate the effect of HSS drill tool coatings, namely single-layer TiN, single-layer AlCrN, and double-layer AlTiN + TiSiXN (Durana), on the surface roughness and cylindricity of AA6061 (90 wt%)/C (5 wt%)/ZrO2 (5 wt%) hybrid composite material processed by the stir casting method. The fabricated sample was examined for the uniform particle distribution of reinforcements using Scanning Electron Microscope. The drilling operation was carried out on the fabricated in a CNC machining center by setting the spindle speeds of 800, 1200, and 1600 rpm, depths of cut of 0.5, 1, and 1.5 mm, and feeds of 50, 100, and 150 mm/rev. An orthogonal array (L27) designed by Taguchi’s method was used as the design of the experiment for the optimization of the best cutting parameters and coating. Surface roughness and cylindricity errors were determined for the 27 experimental runs. Field emission scanning electron microscopic (FESEM) examination and Energy Dispersive Spectroscopy (EDS) were used to analyze the surface integrity and elemental composition, respectively. The results revealed that Durana had a significant effect on the surface substrate with minimum surface roughness (Ra) of 1.666 μm and obtained the minimum cylindricity error for the parameters of depth of cut 0.5 mm, spindle speed of 1200 and feed of 100 mm rev−1.
本研究旨在评估高速钢钻头涂层(即单层 TiN、单层 AlCrN 和双层 AlTiN + TiSiXN (Durana))对搅拌铸造法加工的 AA6061 (90 wt%)/C (5 wt%)/ZrO2 (5 wt%) 混合复合材料的表面粗糙度和圆柱度的影响。使用扫描电子显微镜检查了制作的样品,以确定增强材料的颗粒分布是否均匀。在数控加工中心对制备的样品进行钻孔操作,主轴转速分别为 800、1200 和 1600 rpm,切削深度分别为 0.5、1 和 1.5 mm,进给量分别为 50、100 和 150 mm/rev。采用田口方法设计的正交阵列(L27)作为实验设计,以优化最佳切削参数和涂层。测定了 27 次实验的表面粗糙度和圆柱度误差。场发射扫描电子显微镜(FESEM)检查和能量色散光谱法(EDS)分别用于分析表面完整性和元素组成。结果表明,在切削深度为 0.5 毫米、主轴转速为 1200 和进给量为 100 毫米/转-1 的参数下,Durana 对表面基体有显著影响,表面粗糙度(Ra)最小为 1.666 μm,圆柱度误差最小。
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引用次数: 0
Sodium salt of dodecyl benzene sulphonic acid as an effective corrosion inhibition for different heat-treated steel in sulphuric acid medium 十二烷基苯磺酸钠盐作为不同热处理钢在硫酸介质中的有效缓蚀剂
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-06 DOI: 10.1088/2053-1591/ad74cb
P R Prabhu, Jilna Jomy, Deepa Prabhu
The purpose of this work is to use electrochemical and gravimetric techniques to investigate the inhibition of DBSS on the corrosion of heat-treated dual-phase AISI 1040 steel in a 0.5 M sulphuric acid solution at 35 °C. The corrosion studies are performed by potentiodynamic polarization study (PDP), electrochemical impedance study (EIS), and gravimetric method. To confirm the inhibition surface characterization like x-ray diffraction technique (XRD) analysis, scanning electron microscopy (SEM), and EDS analysis are performed. Depending on the phase change of metals due to heat treatment, the corrosion inhibition of the heat-treated metal increased when it was exposed to 0.5 M H2SO4 at 35 °C in the presence of dodecyl benzene sulphonic acid sodium salt (DBSS) inhibitor. The highest inhibition efficiency of 63%, 82%, 87%, 43%, and 63% was obtained for AISI 1040 steel at heat treatment conditions of Normalized, Quenched at 700 °C, Quenched at 750 °C, Quenched at 790 °C and Quenched at 900 °C respectively. In the gravimetric and electrochemical study, the IE increases with the increase with the concentration of DBSS unto 75% from gravimetric analysis and 87% from PDP analysis for Quenched at 750 °C and 790 °C respectively. The metal protection is achieved by heat treatment process as well as by using DBSS as inhibitor. Corrosion inhibition on the metal’s surface was confirmed by SEM and XRD. In addition, the adsorption of DBSS on the anodic and cathodic sites of the metal surface was well explained.
本研究的目的是利用电化学和重量测量技术研究 DBSS 在 35 °C 的 0.5 M 硫酸溶液中对热处理双相 AISI 1040 钢腐蚀的抑制作用。腐蚀研究是通过电位极化研究(PDP)、电化学阻抗研究(EIS)和重量法进行的。为了确认抑制效果,还进行了 X 射线衍射技术(XRD)分析、扫描电子显微镜(SEM)和 EDS 分析等表面表征。根据热处理导致的金属相变,在十二烷基苯磺酸钠盐(DBSS)抑制剂存在的情况下,将热处理金属暴露在 35 °C 的 0.5 M H2SO4 中,其缓蚀效果会增加。在正火、700 ℃淬火、750 ℃淬火、790 ℃淬火和 900 ℃淬火的热处理条件下,AISI 1040 钢的最高抑制效率分别为 63%、82%、87%、43% 和 63%。在重量分析和电化学研究中,750 ℃淬火和 790 ℃淬火的 IE 随 DBSS 浓度的增加而增加,重量分析结果分别为 75% 和 87%。通过热处理工艺和使用 DBSS 作为抑制剂,都能实现对金属的保护。扫描电镜和 XRD 证实了金属表面的缓蚀效果。此外,DBSS 在金属表面阳极和阴极位点的吸附情况也得到了很好的解释。
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引用次数: 0
Microwave absorption properties of Co/C and Ni/C composite nanofibers prepared by electrospinning 电纺丝法制备的 Co/C 和 Ni/C 复合纳米纤维的微波吸收特性
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-06 DOI: 10.1088/2053-1591/ad7445
Sa Zhang, Chao Xiong, Junhui Yin, Haitao Sun, Ziyuan Qi, Huiyong Deng, Kaibo Cui
Carbon nanofibers with Co, Ni nanoparticle were synthesized by a two-step process involving electrospinning and heat treatment. Their phase composition, microstructure, elemental composition and electromagnetic characteristics were characterized using x-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and vector network analyzer (VNA). The microwave absorption performance of these carbon nanofibers was also studied. The results indicate that these composite nanofibers are intact and consist of amorphous carbon and face-centered cubic structured magnetic metals. The resultant metal nanoparticles are uniformly dispersed along carbon-based nanofibers which enhance the synergistic and interfacial effects between magnetic loss and dielectric loss. When the thicknesses of the absorbers are 1.5 mm, the absorption bandwidths (RL ≤ −10 dB) are approximately 4 GHz and 2.5 GHz for the Co/C, Ni/C composite nanofibers, respectively, which are obviously superior to pure carbon nanofibers. Co/C composite nanofibers exhibit a wider absorption band range and stronger microwave absorption intensity compared to Ni/C composite nanofibers, attributed to their excellent electromagnetic impedance matching and attenuation characteristics. This indicates that the Co/C composite nanofibers are promising candidates for novel microwave absorbing materials.
通过电纺丝和热处理两步法合成了含有钴、镍纳米粒子的碳纳米纤维。使用 X 射线衍射仪 (XRD)、扫描电子显微镜 (SEM)、能量色散光谱仪 (EDS) 和矢量网络分析仪 (VNA) 对其相组成、微观结构、元素组成和电磁特性进行了表征。此外,还研究了这些碳纳米纤维的微波吸收性能。结果表明,这些复合纳米纤维完好无损,由无定形碳和面心立方结构的磁性金属组成。由此产生的金属纳米颗粒沿碳基纳米纤维均匀分布,增强了磁损耗和介电损耗之间的协同和界面效应。当吸收体厚度为 1.5 mm 时,Co/C、Ni/C 复合纳米纤维的吸收带宽(RL ≤ -10 dB)分别约为 4 GHz 和 2.5 GHz,明显优于纯碳纳米纤维。与 Ni/C 复合纳米纤维相比,Co/C 复合纳米纤维具有更宽的吸收频带范围和更强的微波吸收强度,这得益于其优异的电磁阻抗匹配和衰减特性。这表明 Co/C 复合纳米纤维有望成为新型微波吸收材料。
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引用次数: 0
Research on influence factors of small punch test to evaluate the mechanical properties of gradient nanostructured material 评价梯度纳米结构材料力学性能的小冲压试验影响因素研究
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-06 DOI: 10.1088/2053-1591/ad7447
Xinjun Yang, Xiangwei Liao, Dongxiang Wang, Jiyun Du, Fangyang Yuan, Wei Yu, Qingsheng Li
The influence factors of small punch test (SPT) were investigated to evaluate the mechanical properties of gradient nanostructured (GNS) materials. The gradient nanostructure was prepared on the top layer of S30408 austenitic stainless steel by ultrasonic impact treatment (UIT). The mechanical properties of the GNS material were obtained using SPT and correlated with those obtained by standard tensile tests. The results indicate that, when the specimen thickness is 0.5 mm, the sphere diameter is 2.4 mm, the punch velocity is 0.5 mm min−1, and the gradient nano-grained layer is placed face-on in the mold, the GNS material exhibits better plastic deformability. The SPT specimen achieves better bearing capacity, and the mechanical properties of the GNS material obtained by SPT are more accurate. The yield strength and tensile strength of the GNS material were also evaluated by analytical and empirical methods in SPT. The error is approximately 10% compared with the standard tensile test results, which is within the allowable range.
为评估梯度纳米结构(GNS)材料的力学性能,研究了小冲压试验(SPT)的影响因素。通过超声冲击处理(UIT)在 S30408 奥氏体不锈钢表层制备了梯度纳米结构。使用 SPT 获得了 GNS 材料的机械性能,并将其与标准拉伸试验获得的机械性能进行了对比。结果表明,当试样厚度为 0.5 毫米、球体直径为 2.4 毫米、冲头速度为 0.5 毫米/分钟-1、梯度纳米晶粒层正面置于模具中时,GNS 材料表现出更好的塑性变形能力。SPT 试样获得了更好的承载能力,通过 SPT 获得的 GNS 材料的力学性能也更加精确。GNS 材料的屈服强度和抗拉强度也是通过 SPT 中的分析和经验方法进行评估的。与标准拉伸试验结果相比,误差约为 10%,在允许范围内。
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引用次数: 0
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