Materials Chemistry and Physics最新文献

Mesoporous ZnFe-layered double hydroxide electrodes via an electrochemical approach for high-performance supercapacitors 采用电化学方法制备高性能超级电容器的介孔znfe层状双氢氧化物电极

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-31 DOI: 10.1016/j.matchemphys.2026.132158

Alfiya M. Nadeghar , Avinash C. Molane , Shailesh G. Pawar , Ramesh N. Mulik , Manickam Selvaraj , Arun Karnwal , Prakash A. Mahanwar , Vikas B. Patil

Layered double hydroxides (LDHs), known for their unique anion-exchange capability and adjustable interlayer spacing, have emerged as splendid electroactive materials for supercapacitors featuring an extensive surface area and impressive theoretical capacitance. Hence, mesoporous ZnFe-layered double hydroxide thin film electrodes were prepared by the one-step electrochemical method. The prepared ZnFe-LDH thin films were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FESEM), High-resolution transmission electron microscopy (HRTEM), and Contact angle measurement. Here, with the increase in the concentration of Zn²⁺, the electrochemical performance and morphology of ZnFe-LDH electrodes have changed. The electrochemical performance of ZnFe-LDH electrodes was tested in different electrolytes as KOH, NaOH, and KCl, by varying concentrations at the potential window of 1.2 V by cyclic voltammetry (CV), galvanostatic charging/discharging (GCD), and electrochemical impedance spectroscopy (EIS). The ZnFe-LDH3 electrode delivered the maximum specific capacitance of 950.23 F/g at 5 mV/s, specific energy 77.45 Wh/kg, specific power 5.41 kW/kg and 99.30 % of coulombic efficiency with 84.94 % capacitance retention rate over 10000 cycles at 100 mV/s scan rate. This can be attributed to the hierarchical structure, improved hydrophilicity, fast reversible redox reactions, and the material's high surface area of 35.73 m²/g. Furthermore, the assembled ZnFe-LDH3 symmetric device achieved the maximum specific energy of 19.52 Wh/kg and specific power of 2.18 kW/kg with an 80.2 % retention rate over 10000 cycles. These findings highlight the potential of ZnFe-LDH3 is a promising electrode material for supercapacitor applications.

层状双氢氧化物（LDHs）以其独特的阴离子交换能力和可调节的层间间距而闻名，已成为超级电容器的优秀电活性材料，具有广泛的表面积和令人印象深刻的理论电容。为此，采用一步电化学方法制备了介孔znfe层状双氢氧化物薄膜电极。采用x射线衍射（XRD）、布鲁诺尔-埃米特-泰勒（BET）、x射线光电子能谱（XPS）、傅里叶变换红外光谱（FTIR）、场发射扫描电镜（FESEM）、高分辨率透射电镜（HRTEM）和接触角测量对制备的ZnFe-LDH薄膜进行了表征。随着Zn2+浓度的增加，ZnFe-LDH电极的电化学性能和形貌发生了变化。采用循环伏安法（CV）、恒流充放电法（GCD）和电化学阻抗法（EIS）测试了ZnFe-LDH电极在KOH、NaOH和KCl等不同电位窗口下的电化学性能。ZnFe-LDH3电极在5 mV/s下的最大比电容为950.23 F/g，比能量为77.45 Wh/kg，比功率为5.41 kW/kg，库仑效率为99.30%，在100 mV/s扫描速率下，超过10000次循环的电容保持率为84.94%。这可归因于分层结构，改善的亲水性，快速的可逆氧化还原反应，以及材料的35.73 m2/g的高表面积。此外，组装的ZnFe-LDH3对称器件的最大比能量为19.52 Wh/kg，比功率为2.18 kW/kg，在10000次循环中保持率为80.2%。这些发现突出了ZnFe-LDH3是一种有前途的超级电容器电极材料的潜力。

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引用次数: 0

Enhancing mechanical properties of WC-5Ni hardmetals via microwave sintering: Role of Mo, Si, Ti, and V additives in microstructure evolution and performance optimization 微波烧结增强WC-5Ni硬质合金的力学性能：Mo、Si、Ti和V添加剂在显微组织演变和性能优化中的作用

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-30 DOI: 10.1016/j.matchemphys.2026.132130

Ehsan Ghasali , Saleem Raza , Andrii Babenko , Li Jie , Touradj Ebadzadeh , Yasin Orooji

In this research, four metallic additives (Mo, Si, Ti, and V) were incorporated into WC-5 wt%Ni hardmetals prepared via a rapid microwave sintering process. Five wt% of each additive was individually mixed with WC and Ni powders using a high-energy mixer mill to ensure a uniform distribution of the starting materials. After achieving homogeneity, bar-shaped green bodies were formed under a uniaxial pressure of 240 MPa. Microwave sintering was conducted at 1400, 1500, and 1600 °C without any holding time. XRD analysis revealed that WC was the dominant crystalline phase, while each system also exhibited reaction products such as carbides and intermetallic phases derived from the additives. SEM images of the polished sample surfaces showed a fine microstructure across all samples. Moreover, increasing the sintering temperature from 1400 to 1600 °C led to improved densification, as confirmed by calculated densities and mechanical property evaluations. The highest bending strength (876 ± 25 MPa), Vickers hardness (1728 ± 37 Hv) and Palmqvist fracture toughness (W_K) (8.6 ± 0.2 MN m^−3/2) were observed in the sample sintered at 1600 °C with the Ti additive, likely due to the formation of NiTi intermetallics and titanium carbide. In contrast, the sample sintered at 1400 °C with the Mo additive exhibited the lowest mechanical properties, probably because the formation of a Ni₃Mo₃C complex phase consumed the Ni binder.

在本研究中，四种金属添加剂（Mo, Si， Ti和V）加入到通过快速微波烧结工艺制备的WC-5 wt%Ni硬质合金中。每种添加剂的5 wt%分别与WC和Ni粉末混合，使用高能混合机，以确保起始物料的均匀分布。均匀化后，在单轴压力240 MPa下形成条形绿体。在1400、1500和1600℃下进行微波烧结，不需要保温时间。XRD分析表明，WC为主要晶相，同时各体系中还存在由添加剂产生的碳化物和金属间相等反应产物。抛光样品表面的SEM图像显示所有样品的微观结构都很好。此外，将烧结温度从1400℃提高到1600℃，密度计算和力学性能评估证实了致密性的改善。在1600℃下，Ti添加剂烧结后的试样具有最高的抗弯强度（876±25 MPa）、维氏硬度（1728±37 Hv）和Palmqvist断裂韧性（WK）（8.6±0.2 MN m−3/2），这可能是由于NiTi金属间化合物和碳化钛的形成。相比之下，在1400℃下烧结的样品表现出最低的力学性能，这可能是因为Ni3Mo3C配合物的形成消耗了Ni粘结剂。

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引用次数: 0

The effect of the pore structure and N-functional groups of COFs on CO2 adsorption: A simulation study COFs孔结构和n -官能团对CO2吸附的影响：模拟研究

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-29 DOI: 10.1016/j.matchemphys.2026.132153

Zeyu Wang , Jiaxin Wang , Ying Liu , Yunlan Sun , Baozhong Zhu

Direct air capture (DAC) adsorbents of CO₂ face the challenges of large adsorption capacity and high adsorption selectivity. Covalent organic frameworks (COFs) are promising for CO₂ capture due to high surface area, ordered porous structures, and tunable chemical modification. The CO₂ adsorption capacity of COFs in complex atmospheres was systematically investigated using three simulation methods. Firstly, the adsorption isotherms of CO₂ on COF-1, COF-5, and TpPa-1 were investigated by using Grand Canonical Monte Carlo (GCMC) simulations. Among them, COF-1 demonstrated the highest CO₂ capacity (2.97 mmol/g), followed by COF-5 (0.45 mmol/g) and TpPa-1 (0.37 mmol/g). Secondly, the diffusion rate of CO₂ in COFs was compared by Molecular dynamics (MD) simulations. COF-1 had the highest diffusion coefficient of 8.3 × 10⁻⁵ cm²/s. This indicated that the adsorption performance and diffusion rate were primarily influenced by the pore structure. Thirdly, the CO₂ adsorption features of COF-1 modified with nitrogen-containing groups (-CN, –NH₂, –NH) were explored by the density functional theory (DFT) method. COF-1-CN had the highest adsorption capacity, which was 1.19 times larger than that of COF-1. Moreover, the adsorption selectivity of COF-1-CN for the CO₂/H₂O atmosphere increased by 20% at 101 kPa compared to COF-1. This was because nitrogen groups increased the polarity and electron density of the COF-1-CN, which further enhanced the interactions between CO₂ and optimized the pore structure. These findings highlight the role of porous structure and surface properties in designing advanced COF-based CO₂ adsorbents.

直接空气捕集（DAC）吸附剂对CO2的吸附面临着大吸附容量和高吸附选择性的挑战。共价有机框架（COFs）由于其高表面积、有序的多孔结构和可调的化学修饰，在二氧化碳捕获方面具有很大的前景。采用三种模拟方法系统地研究了COFs在复杂大气环境中的CO2吸附能力。首先，利用大正则蒙特卡罗（GCMC）模拟研究了CO2在COF-1、COF-5和TpPa-1上的吸附等温线。其中COF-1的CO2容量最高（2.97 mmol/g），其次是COF-5 （0.45 mmol/g）和TpPa-1 （0.37 mmol/g）。其次，通过分子动力学（MD）模拟比较CO2在COFs中的扩散速率。COF-1的扩散系数最高，为8.3 × 10−5 cm2/s。这表明吸附性能和扩散速率主要受孔隙结构的影响。第三，利用密度泛函（DFT）方法研究了含氮基团（-CN、-NH2、-NH）修饰的COF-1对CO2的吸附特性。COF-1- cn的吸附量最高，是COF-1的1.19倍。在101 kPa条件下，COF-1- cn对CO2/H2O气氛的吸附选择性比COF-1提高了20%。这是因为氮基团增加了COF-1-CN的极性和电子密度，进一步增强了CO2之间的相互作用，优化了孔结构。这些发现强调了多孔结构和表面特性在设计先进的cof基CO2吸附剂中的作用。

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引用次数: 0

Fabrication of homemade screen-printed nickel nanoparticles/boron-doped diamond electrode for electrochemical degradation of methyl orange 自制网印纳米镍/掺硼金刚石电极电化学降解甲基橙的制备

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-29 DOI: 10.1016/j.matchemphys.2026.132145

Syasya Nadia Rahmah , Mai Tomisaki , Ilma Amalina , Mirza Ardella Saputra , Prastika Krisma Jiwanti

Water pollution caused by synthetic dyes, particularly Methyl Orange (MO), poses significant environmental challenges. MO can be toxic to aquatic life, affecting ecosystems when released into water bodies. Exposure to long and high concentrations may pose health risks to humans, including potential carcinogenic effects. Due to this risk, degradation of MO in environment is emerging. This study explores the electrochemical degradation of MO using boron-doped diamond nanoparticles (BDD NP) modified with nickel nanoparticles (NiNP). NiNP were synthesized via chemical reduction and integrated with BDD NP at different ratios (1:2, 1:3, and 1:5). The composite was then screen-printed onto the polyimide film. Electrochemical degradation experiments revealed that the NiNP/BDD B (1:3) electrode exhibited the highest efficiency, being twice more efficient compared to the BDD printed electrode at potential of +3 V (vs. Ag/AgCl). The enhanced performance is attributed to increased electroactive surface area and optimized hydroxyl radical formation. These findings highlight the potential of NiNP-modified BDD electrodes for effective wastewater treatment.

以甲基橙（MO）为代表的合成染料对水体造成了严重的污染。MO对水生生物有毒，释放到水体中会影响生态系统。长期和高浓度接触可能对人类健康构成风险，包括潜在的致癌作用。由于这种风险，MO在环境中的降解正在出现。本研究利用镍纳米粒子（NiNP）修饰的掺硼金刚石纳米粒子（BDD NP）进行MO的电化学降解研究。通过化学还原合成NiNP，并与BDD NP按不同比例（1:2、1:3和1:5）进行整合。然后将复合材料丝网印刷到聚酰亚胺薄膜上。电化学降解实验表明，在+3 V （vs. Ag/AgCl）电位下，NiNP/BDD B（1:3）电极的效率最高，是BDD印刷电极的两倍。性能的增强是由于电活性表面积的增加和羟基自由基形成的优化。这些发现突出了ninp修饰的BDD电极在有效处理废水方面的潜力。

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引用次数: 0

Long-term corrosion behavior and mechanism of hot-dip Zn–Al–Mg coating in typical Chinese soil environments 热浸锌铝镁镀层在中国典型土壤环境中的长期腐蚀行为及机理

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-28 DOI: 10.1016/j.matchemphys.2026.132136

Tianqi Chen , Ting Shang , Xun Zhou , Wuhua Liu , Xuequn Cheng , Xiaogang Li , Chao Liu

This study systematically investigates the long-term corrosion behavior and mechanisms of hot-dip galvanized coatings—conventional pure zinc (GI) and Zn–Al–Mg alloy (ZM)—in two representative Chinese soil environments, namely, red soil and desert soil. A two-year burial test evaluated corrosion rates, surface and cross-sectional morphologies, localized corrosion features, and the evolution of corrosion products. Results reveal distinct environmental sensitivities: GI is most susceptible in acidic soils, whereas ZM coating demonstrates significantly reduced environmental sensitivity and superior adaptability across different soil types. Nonetheless, ZM consistently maintains significantly lower corrosion rates than GI across all environments. The ZM coating develops dense, adherent corrosion product layers with minimal substrate exposure, contrasting sharply with the extensive red rust and deep pitting observed on GI. This enhanced resistance is attributed to ZM's multiphase microstructure, preferential dissolution of Mg-rich phases, and the in-situ formation of layered double hydroxides (LDHs), including Zn–Al-LDH and Mg–Al-LDH. These insights underscore the exceptional environmental adaptability and durable protective performance of ZM coatings for underground infrastructure applications.

本研究系统地研究了传统纯锌（GI）和锌铝镁合金（ZM）热镀锌涂层在红壤和荒漠两种具有代表性的土壤环境中的长期腐蚀行为和机理。一项为期两年的埋藏试验评估了腐蚀速率、表面和截面形貌、局部腐蚀特征以及腐蚀产物的演变。结果表明：GI在酸性土壤中最敏感，而ZM涂层在不同土壤类型中表现出显著降低的环境敏感性和优越的适应性。尽管如此，在所有环境中，ZM始终保持比GI低得多的腐蚀速率。ZM涂层形成致密、粘附的腐蚀产物层，基底暴露最小，与GI上观察到的广泛的红锈和深点蚀形成鲜明对比。这种增强的电阻归因于ZM的多相微观结构，富mg相的优先溶解，以及原位形成层状双氢氧化物（ldh），包括Zn-Al-LDH和Mg-Al-LDH。这些发现强调了ZM涂层在地下基础设施应用中卓越的环境适应性和持久的保护性能。

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引用次数: 0

Annealing-induced Oxide–Matrix interactions and their impact on electrical properties of CoCrFeMnNi high-entropy alloy thin films 退火诱导的氧化-基体相互作用及其对CoCrFeMnNi高熵合金薄膜电性能的影响

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-27 DOI: 10.1016/j.matchemphys.2026.132131

Arnita Surieya Sangar , Yoganash Putthisigamany , Muhammad Firdaus Mohd Nazeri , Puvaneswaran Chelvanathan , Tea-Sung Jun , Aleksandra Bednarek , Suttipong Wannapaiboon , Nur Izzati Muhammad Nadzri

CoCrFeMnNi high-entropy alloy thin film is a promising candidate for functional and structural applications due to its tunability properties. In this work, CoCrFeMnNi films were fabricated using DC magnetron sputtering and underwent post-deposition treatment (vacuum annealing) at different temperatures, 500 °C, 600 °C, and 700 °C to study the impact of thermal treatment on phase evolution and electronic performance. As the annealing temperature increased, the XRD pattern revealed a transition from an amorphous to a crystalline structure (FCC), along with the incidental formation of MnO. Multi-scale characterization using Raman analysis, TOF-SIMS, XANES, and FESEM confirmed that MnO formation strongly influenced the surface morphology and electronic pathways. This oxide formation hinders the electron movement, resulting in an increase in the resistivity for annealed films, whereas Kelvin Probe Force Microscopy (KPFM) analysis shows that the film annealed at 600 °C exhibits a work function of 4.61 eV, 0.71 % higher than the RT and other annealed films. Hence, these findings demonstrate that controlled annealing modifies both the microstructure and electrical properties through oxide-matrix interactions, providing new insight into oxidation-tolerant HEA-based electronic materials.

CoCrFeMnNi高熵合金薄膜由于其可调性，在功能和结构上具有很好的应用前景。本文采用直流磁控溅射法制备CoCrFeMnNi薄膜，并在500°C、600°C和700°C的不同温度下进行沉积后处理（真空退火），研究热处理对相演化和电子性能的影响。随着退火温度的升高，XRD图谱显示出由非晶结构向结晶结构（FCC）转变，并伴有MnO的生成。利用拉曼分析、TOF-SIMS、XANES和FESEM进行多尺度表征证实，MnO的形成强烈影响了表面形貌和电子路径。这种氧化物的形成阻碍了电子的运动，导致退火膜的电阻率增加，而开尔文探针力显微镜（KPFM）分析表明，600°C退火膜的功函数为4.61 eV，比RT和其他退火膜高0.71%。因此，这些发现表明，控制退火通过氧化-基质相互作用改变了微观结构和电性能，为耐氧化hea基电子材料提供了新的见解。

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引用次数: 0

Robust hydrophilic modification of polytetrafluoroethylene hollow fiber membrane with an amphipathic terpolymer for improved permeability and fouling resistance 两亲性三元共聚物对聚四氟乙烯中空纤维膜的亲水性改性，提高了膜的渗透性和抗污性

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-27 DOI: 10.1016/j.matchemphys.2026.132135

Jiaxuan Xu , Xiaoduan Li , Zhen Cao , Zhaofeng Liu , Wei Sun , Qiang Guo , Man Zhao , Jiawei Tang , Yixiang Bao , Jian Wang , Zhaokui Li , Xi Wu , Xiaotai Zhang

Polytetrafluoroethylene (PTFE) membranes have been widely employed in wastewater treatment and biochemical industry, due to its superior physicochemical and mechanical stability. However, the intrinsic strong hydrophobicity of PTFE matrix results in inferior water permeability and severe membrane fouling in practical operation. Although the hydrophilic modification is considered as an effective strategy to settle the drawback, the introduction of a robust hydrophilic coating on the non-stick PTFE substrate is still a great challenge. This work was dedicated to customizing a hydrophilic PTFE hollow fiber membrane with a commercialized amphipathic terpolymer, poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate) (PVA-TP). Based on the successive acidic hydrolysis/glutaraldehyde (GA)-crosslinking and alkaline hydrolysis, a hydrophilic network was constructed and physically wrapped on the nano-fibrils and nodes of PTFE membrane. The pore size of PTFE membrane was almost maintained after modification. Due to the enhanced hydrophilicity (water contact angle∼30°), the water flux of modified membrane was nearly triple that of the pristine, and the resistance against bovine serum albumin (BSA) and humic acid (HA) was improved. Moreover, the hydrophilic network presented excellent stability in acidic, alkaline, and oxidative environment. Given the simplicity and robustness, this work provided a promising hydrophilic tactics for PTFE membrane in wastewater treatment.

聚四氟乙烯（PTFE）膜由于其优异的物理化学和机械稳定性，在废水处理和生化工业中得到了广泛的应用。然而，PTFE基体固有的强疏水性导致其在实际使用中透水性差，膜污染严重。虽然亲水改性被认为是解决这一缺陷的有效策略，但在不粘PTFE基板上引入坚固的亲水涂层仍然是一个巨大的挑战。本工作致力于用商业化的两亲共聚物聚（乙烯基丁二烯-共乙烯醇-共醋酸乙烯酯）（PVA-TP）定制亲水性聚四氟乙烯中空纤维膜。通过连续的酸性水解/戊二醛交联和碱性水解，构建亲水性网络，并在聚四氟乙烯膜的纳米原纤维和节点上物理包裹。改性后PTFE膜的孔径基本保持不变。由于亲水性增强（水接触角~ 30°），修饰膜的水通量几乎是原始膜的三倍，并且对牛血清白蛋白（BSA）和腐植酸（HA）的抗性提高。此外，亲水性网络在酸性、碱性和氧化环境中表现出良好的稳定性。该研究为聚四氟乙烯膜在废水处理中的亲水性策略提供了一种很有前途的方法。

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引用次数: 0

Effect of MoSi2 addition on the tribological performance of Cu–GNS composites under thermal and current-carrying conditions MoSi2添加量对Cu-GNS复合材料热和载流条件下摩擦学性能的影响

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-27 DOI: 10.1016/j.matchemphys.2026.132137

Kunyang Fan , Yan Li , Yan Wang , Wenhuang Jiang , Qingquan Liu , Yanyan Huang , Lingling Fan , Yelong Xiao

To advance the development of high-performance copper-based materials for complex frictional environments, MoSi₂-reinforced Cu–graphene nanosheet (GNS) composites were fabricated via mechanical ball milling and spark plasma sintering (SPS). The effects of MoSi₂ on the microstructure, electrical conductivity, and tribological behavior of the composites were systematically investigated under diverse service conditions, including room temperature, elevated temperature (200 °C), and current-carrying friction. Results reveal that MoSi₂ addition refined the copper grain structure, increased hardness, and improved interfacial compatibility, thereby enhancing the overall structural integrity of the composites. Although a moderate decrease in electrical conductivity was observed, the composites exhibited significant improvements in friction reduction and wear resistance, particularly at room temperature, where the predominant wear mechanism shifted from adhesive to abrasive. At 200 °C, softening of the Cu matrix led to increased friction and wear, with MoSi₂ providing limited enhancement due to thermal instability. Under current-carrying conditions, the combined effects of mechanical wear and arc erosion dominated the tribological response. Nevertheless, the in-situ formation of lubricious SiO₂ tribofilms, derived from MoSi₂ oxidation, effectively suppressed surface damage. The dominant wear mechanisms identified were adhesive wear, abrasive wear, and arc erosion. These findings offer strategic insights into interface engineering and high-temperature tribological optimization for multifunctional Cu-based composites in extreme service environments.

为了促进复杂摩擦环境下高性能铜基材料的发展，通过机械球磨和火花等离子烧结制备了mosi2增强cu -石墨烯纳米片（GNS）复合材料。在不同的使用条件下，包括室温、高温（200°C）和载流摩擦，系统地研究了MoSi2对复合材料的微观结构、电导率和摩擦学行为的影响。结果表明，MoSi2的加入细化了铜的晶粒结构，提高了硬度，改善了界面相容性，从而提高了复合材料的整体结构完整性。虽然观察到电导率适度下降，但复合材料在减少摩擦和耐磨性方面表现出显着的改善，特别是在室温下，主要磨损机制从粘合剂转变为磨料。在200°C时，Cu基体的软化导致摩擦和磨损增加，由于热不稳定性，MoSi2的增强作用有限。在载流工况下，机械磨损和电弧侵蚀共同作用主导了摩擦响应。然而，原位形成的由MoSi2氧化产生的润滑SiO2摩擦膜有效地抑制了表面损伤。确定的主要磨损机制是粘着磨损、磨粒磨损和电弧侵蚀。这些发现为极端服务环境下多功能cu基复合材料的界面工程和高温摩擦学优化提供了战略见解。

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引用次数: 0

Photocatalytic degradation of azo dyes assisted by biosynthesized AgNPs loaded in physically cross-linked PVA/CS hydrogel nanocomposites 载于物理交联PVA/CS水凝胶纳米复合材料的AgNPs光催化降解偶氮染料

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-24 DOI: 10.1016/j.matchemphys.2026.132129

Hassan Mahmoodi Esfanddarani, Mrutyunjay Panigrahi

Silver nanoparticles (AgNPs) are extensively utilized in industrial applications due to their unique physicochemical and antimicrobial properties. However, the development of eco-friendly and scalable synthesis methods remains a challenge. This study introduced a novel AgNP-embedded Polyvinyl Alcohol/Chitosan (PVA/CS) hydrogel with enhanced photocatalytic and antibacterial properties, synthesized via a green, plant-mediated approach. AgNPs were biosynthesized using Asparagus officinalis (AO) extract, where phytochemicals from the AO stem acted as reducing agents, leading to the formation of spherical AgNPs (around 80 nm). The synthesized nanocomposite exhibited a porous structure, excellent water absorption capacity (swelling ratio: 236.29 %), and superior mechanical properties compared to the pristine hydrogel. The photocatalytic efficiency of the hydrogel was evaluated for the degradation of dye pollutants, specifically Methylene blue (MB) and Congo red (CR). After 210 min of direct sunlight exposure, the bio-fabricated hydrogel nanocomposite achieved degradation efficiencies of 72 %, follow pseudo-first-order with a rate constant of k = 0.00591 min⁻¹ (MB) and 71 % with k = 0.00927 min⁻¹ (CR). This study advances prior research on AgNP-based hydrogels by integrating a sonication-assisted green synthesized AgNPs, which enhances their stability, dispersibility, and interaction with the hydrogel matrix. Unlike conventional AgNP-based hydrogels that rely on chemical synthesis and UV-assisted photocatalysis, this study presents an eco-friendly and energy-efficient approach that operates effectively under natural sunlight. Furthermore, the optimization of synthesis conditions ensures improved photocatalytic efficiency, addressing limitations in previous studies related to particle aggregation and reduced stability. These findings contribute to the advancement of biodegradable and reusable AgNP-based hydrogels for potential applications in wastewater treatment and environmental remediation.

银纳米粒子（AgNPs）由于其独特的物理化学和抗菌性能而广泛应用于工业应用。然而，开发环保和可扩展的合成方法仍然是一个挑战。本文介绍了一种新型的agnp包埋聚乙烯醇/壳聚糖（PVA/CS）水凝胶，通过绿色植物介导的方法合成了具有增强光催化和抗菌性能的水凝胶。利用芦笋（AO）提取物合成AgNPs，其中来自AO茎的植物化学物质作为还原剂，导致球形AgNPs（约80 nm）的形成。与原始水凝胶相比，合成的纳米复合材料具有多孔结构、优异的吸水性能（溶胀率为236.29%）和优越的力学性能。考察了水凝胶对染料污染物，特别是亚甲基蓝（MB）和刚果红（CR）的光催化降解效率。在阳光直射210 min后，生物制备的水凝胶纳米复合材料的降解效率为72%，速率常数为k = 0.00591 min−1 (MB)，符合准一阶降解效率，速率常数为k = 0.00927 min−1 (CR)，降解效率为71%。本研究通过整合超声辅助绿色合成AgNPs，提高了AgNPs的稳定性、分散性以及与水凝胶基质的相互作用，进一步推进了基于AgNPs的水凝胶的研究。与依赖化学合成和紫外线辅助光催化的传统agnp水凝胶不同，这项研究提出了一种环保节能的方法，可以在自然阳光下有效地工作。此外，合成条件的优化确保了光催化效率的提高，解决了以往研究中颗粒聚集和稳定性降低的局限性。这些发现有助于推进可生物降解和可重复使用的agnp基水凝胶在废水处理和环境修复中的潜在应用。

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引用次数: 0

Synergistic improvement in methylene blue dye removal efficiency of MoS2 nanoparticles via incorporation of Fe2O3/GO for effective wastewater remediation Fe2O3/GO对二硫化钼纳米颗粒去除亚甲基蓝染料效果的协同改善

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-23 DOI: 10.1016/j.matchemphys.2026.132071

Khadijah H. Alharbi

Water pollution with dyes not only causes cancer, but also prevents aquatic organisms from getting sunlight. For this reason, dyes are classified as hazardous compounds that must be disposed of. This work describes the capacity of mixed systems of Fe₂O₃, MoS₂, and GO based nano-composites to degrade the dye methylene blue (MB). The discussion includes structural and thermal analyses for the compositions Fe₂O₃, MoS₂, Fe₂O₃/GO, MoS₂/Go, Fe₂O₃/MoS₂, and MoS₂/Fe₂O₃/GO. The absence of contaminants in nanocomposites is confirmed by XRD, FTIR, and EDX. SEM and TEM micrographs support the production of tertiary nanocomposites in relation to the morphological deviations. The micrographs reveal that MoS₂ retains a nanosheet morphology, Fe₂O₃/GO forms semi-spherical Fe₂O₃ grains (∼23 nm) anchored on GO sheets, and the ternary MoS₂/Fe₂O₃/GO exhibits markedly increased roughness, mixed grain–sheet interfaces, and broadened MoS₂ domains, all of which collectively enhance the accessible surface area and adsorption capability toward MB. This is a result of the triple mixture's roughness, which gave it an adequate structure and a bigger surface area for effectively adsorbing organic dyes. Further, SEM introduces Molybdenum sulfide with an average size of 87 nm. On the other hand, thermal analysis reveals that the composition studied in theory exists in the condensed state within the defined temperature range, which accounts for why the E∗ is nearly equal to the ΔH. For example, ternary nanocomposite E∗, and ΔH hit 709.9, and 701.2 kJ mol⁻¹, respectively. The degradation effectiveness of MB dye hits 39.66, 56.90, 74.14, 58.62, 86.21, and 93.10 % for MOS₂, Fe₂O_3, MOS₂/GO, Fe₂O₃/GO, MOS₂/Fe₂O_3, and MOS₂/Fe₂O₃/GO, respectively, After 100 min in visible light.

染料污染的水不仅会致癌，还会阻止水生生物获得阳光。因此，染料被归类为必须处理的有害化合物。这项工作描述了Fe2O3， MoS2和GO基纳米复合材料混合体系降解亚甲基蓝（MB）染料的能力。讨论了Fe2O3、MoS2、Fe2O3/GO、MoS2/ GO、Fe2O3/MoS2和MoS2/Fe2O3/GO的结构和热分析。通过XRD、FTIR和EDX等手段证实了纳米复合材料中不含污染物。扫描电子显微镜和透射电子显微镜的形貌变化支持三级纳米复合材料的生成。显微照片显示，MoS2保持了纳米片的形貌，Fe2O3/GO形成了固定在GO片上的半球形Fe2O3晶粒（~ 23 nm），并且三元MoS2/Fe2O3/GO表现出明显的粗糙度，混合的颗粒片界面和拓宽的MoS2畴，所有这些都增加了可达表面积和对MB的吸附能力。这使它具有足够的结构和更大的表面积，可以有效地吸附有机染料。此外，SEM还引入了平均尺寸为87 nm的硫化钼。另一方面，热分析表明，理论上所研究的组分在规定的温度范围内以凝聚态存在，这就解释了为什么E *几乎等于ΔH。例如，三元纳米复合材料E *和ΔH分别达到709.9和701.2 kJ mol−1。MB染料对MOS2、Fe2O3、MOS2/GO、Fe2O3/GO、MOS2/Fe2O3、MOS2/Fe2O3、MOS2/Fe2O3和MOS2/Fe2O3/GO的降解率分别为39.66%、56.90%、74.14%、58.62%、86.21%和93.10%。

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引用次数: 0