Materials Letters: X最新文献

英文中文

Electrospun Polyaniline-Graphene/PVA Composite Nanofiber: Structural, Morphological and Thermal Characteristics 静电纺聚苯胺-石墨烯/聚乙烯醇复合纳米纤维：结构、形态和热特性

IF 2.6 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters: X

Pub Date : 2026-01-06 DOI: 10.1016/j.mlblux.2026.100262

M.S. Archana , S. Jayalekshmi , S. Deepa , Nandakumar Kalarikkal

Electrospun nanofibers with high surface area and tunable morphology are promising platforms for advanced functional materials. In this work, polyaniline (PANI)–graphene composites were blended with poly vinyl alcohol (PVA) and fabricated into nanofibers via electrospinning. Structural, chemical, morphological, and thermal properties were systematically investigated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The results reveal enhanced molecular ordering and strong interfacial interactions among PANI, graphene, and PVA, along with bead-free nanofibers exhibiting an average diameter of ∼32 nm with a narrow size distribution. TGA demonstrates improved thermal stability with delayed degradation compared to PANI/PVA systems reported in literature, attributed to the stabilizing role of graphene. These findings indicate that materials based on PANI–graphene/PVA nanofibers can serve as a tunable composite platform, which with appropriate compositional or surface modifications may be further developed for specific functional applications.

静电纺丝纳米纤维具有高表面积和可调形态，是一种很有前途的先进功能材料平台。在这项工作中，聚苯胺(PANI) -石墨烯复合材料与聚乙烯醇（PVA）共混，并通过静电纺丝制成纳米纤维。采用x射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、扫描电镜（SEM）和热重分析（TGA）对其结构、化学、形态和热性能进行了系统的研究。结果表明，PANI、石墨烯和PVA之间的分子有序性增强，界面相互作用强，同时无珠纳米纤维的平均直径为~ 32 nm，尺寸分布窄。与文献报道的聚苯胺/聚乙烯醇体系相比，TGA表现出更好的热稳定性和延迟降解，这归功于石墨烯的稳定作用。这些发现表明，基于聚苯胺-石墨烯/聚乙烯醇纳米纤维的材料可以作为可调的复合材料平台，通过适当的成分或表面改性，可以进一步开发用于特定功能应用的复合材料。

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引用次数: 0

Corrigendum to “Semiconducting polymer-MXene blends with improved charge carrier mobilities and their application in field-effect transistors” [Mater. Lett: X 25 (2025) 100244] “改善载流子迁移率的半导体聚合物- mxene共混物及其在场效应晶体管中的应用”的勘误[Mater]。通知：x25 (2025) 100244]

IF 2.6 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters: X

Pub Date : 2025-12-01 DOI: 10.1016/j.mlblux.2025.100247

Jurij Urbančič , Huanhuan Shi , Ali Shaygan Nia , Egon Pavlica

引用次数: 0

Synergetic enhancement of strength and ductility by heterogeneous architecture in interpenetrating copper and graphene‑copper composite 互穿铜和石墨烯-铜复合材料的异质结构协同增强强度和延性

IF 2.6 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters: X

Pub Date : 2025-10-30 DOI: 10.1016/j.mlblux.2025.100260

Shanquan Deng, Yuyin He, Meihua Bian, Junwei Zhu, Xingsen Zhang, Heng Chen

Metal matrix composites exhibit an obvious decrease in ductility and toughness as strength increases. Inspired by the heterostructure characteristics of biological materials, this study designs a coarse-grained/ultrafine-grained heterostructure. A copper foam/graphene‑copper (Gr-Cu) heterostructure composite is fabricated using a mixing and hot-pressing sintering process. During tensile deformation, the strain gradient introduced by the hetero-deformation between the coarse-grained copper foam and the ultrafine-grained Gr-Cu microregions enhances dislocation storage capacity. Additionally, the coarse-grained region mitigates stress concentration and blunts and deflects crack propagation. The tensile strength of the sintered heterostructure composite reaches 347.5 MPa, with an elongation of 7 %, representing a 54 % and 45 % improvement over the Gr-Cu composite, respectively, thus achieving a synergistic enhancement of strength and toughness.

随着强度的增加，金属基复合材料的延展性和韧性明显降低。受生物材料异质结构特性的启发，本研究设计了一种粗晶/超细晶异质结构。采用混合和热压烧结工艺制备了泡沫铜/石墨烯-铜（Gr-Cu）异质结构复合材料。在拉伸变形过程中，粗晶泡沫铜与超细晶Gr-Cu微区之间的异质变形所引入的应变梯度增强了位错的储存能力。此外，粗粒区域减轻了应力集中，使裂纹扩展变得迟钝和偏转。烧结后的异质结构复合材料的抗拉强度达到347.5 MPa，伸长率为7%，比Gr-Cu复合材料分别提高了54%和45%，实现了强度和韧性的协同增强。

引用次数: 0

Optimizing piezoresistive response of carbon nanotube-cellulose nanocrystal composites 优化碳纳米管-纤维素纳米晶复合材料的压阻响应

IF 2.6 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters: X

Pub Date : 2025-10-23 DOI: 10.1016/j.mlblux.2025.100259

Joel Renaud Ngouanom Gnidakouong , Arnaud Takungang Kamdem , Bertrand Sitamtze Youmbi , Claude Valery Ngayihi Abbe

This study explores the effect of straining angle on the piezoresistive behaviour of carbon nanotube (CNT)-cellulose nanocrystal (CNC) composites. By varying the angle between the directions of strain and tunnelling distance, the research investigates the impact on composite strain sensing sensitivity. Additionally, the optimal CNC weight fraction that maximizes the piezoresistive performance under elastic strain is determined using a polynomial interpolation of a validated analytical model. The findings indicate that the ideal case is when the direction of strain is parallel to the average tunnelling distance direction, and 0.5 % is the optimal CNC weight content for elastic strains. These findings may provide valuable insights for designing high-performance and sustainable strain sensors based on CNT-CNC composites.

本研究探讨了应变角对碳纳米管-纤维素纳米晶体复合材料压阻性能的影响。通过改变应变方向与掘进距离的夹角，研究了复合应变传感灵敏度的影响。此外，利用验证的解析模型的多项式插值确定了在弹性应变下使压阻性能最大化的最佳CNC重量分数。结果表明，当应变方向与平均掘进距离方向平行时，最理想的情况是应变方向，弹性应变的CNC重量含量为0.5%。这些发现可能为设计基于CNT-CNC复合材料的高性能和可持续的应变传感器提供有价值的见解。

引用次数: 0

Pigmented epoxy polyamine self-healing coating based on polyurea-calcined fly ash-linseed oil (PU-CFA-oil) microcapsule 聚氨酯-煅烧粉煤灰-亚麻籽油微胶囊环氧多胺自愈涂料

IF 2.6 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters: X

Pub Date : 2025-10-13 DOI: 10.1016/j.mlblux.2025.100258

Jigneshkumar Thakkar , Nishant Pandya

A self-healing pigmented coating incorporating polyurea microcapsules with linseed oil and calcined fly ash was synthesized, characterized through various analytical techniques, and tested across four formulations, with the Microcapsule 4.35 wt% (MC435) variant exhibiting marked enhancements in abrasion resistance and hydrophobicity, while the Microcapsule 8.70 wt% (MC870) formulation showed decreased abrasion resistance despite notable improvements in contact angle and self-healing properties.

合成了一种含有亚亚麻籽油和煅烧粉煤灰的聚脲微胶囊的自修复色素涂层，通过各种分析技术对其进行了表征，并在四种配方中进行了测试，其中微胶囊4.35 wt% （MC435）的变型在耐磨性和疏水性方面表现出明显的增强，而微胶囊8.70 wt% （MC870）的变型在接触角和自修复性能方面有显著改善，但耐磨性却有所下降。

引用次数: 0

Yttria stabilized-Zirconia based sub-ppb level acetone sensor with LaBaSn2O5+δ sensing electrode 基于LaBaSn2O5+δ传感电极的氧化钇-氧化锆亚ppb级丙酮传感器

IF 2.6 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters: X

Pub Date : 2025-09-10 DOI: 10.1016/j.mlblux.2025.100256

Yue Ding , Tianling Yu , Min He , Yichen Hao , Yaning Wang , Xidong Hao

For the efficient diagnosis of diabetes via exhaled breath analysis, electrochemical acetone sensors based on mixed potential were fabricated using yttria-stabilized zirconia as the solid electrolyte and LaBaSn₂O₅+δ as the sensing electrode (SE) material. To optimize the sensing property, we varied the sintering temperature to modify the electrocatalytic activity of LaBaSn₂O₅+δ. Results show that LaBaSn₂O₅+δ SE sintered at 800 °C exhibited the highest response of −31 mV when exposed to 100 ppm acetone. The detection limit reached as low as 100 ppb, and a sensitivity of −17 mV/decade was achieved across the acetone concentration range of 2–100 ppm. Additionally, the sensor exhibited excellent selectivity, repeatability, and long-term stability. The excellent sensing performance indicates that the developed acetone sensor can be used for the noninvasive diagnosis of diabetes.

为了通过呼气分析对糖尿病进行有效诊断，以氧化钇稳定氧化锆为固体电解质，LaBaSn2O5+δ为传感电极（SE）材料，制备了基于混合电位的电化学丙酮传感器。为了优化传感性能，我们改变了烧结温度来改变LaBaSn2O5+δ的电催化活性。结果表明，在800℃下烧结的LaBaSn2O5+δ SE在100ppm丙酮中具有最高的- 31 mV响应。检测限低至100 ppb，在2-100 ppm的丙酮浓度范围内，灵敏度为- 17 mV/ 10年。此外，该传感器表现出优异的选择性、可重复性和长期稳定性。丙酮传感器具有良好的传感性能，可用于糖尿病的无创诊断。

引用次数: 0

High pressure synthesis and structural study of AuGa2 intermetallic compound AuGa2金属间化合物的高压合成及结构研究

IF 2.6 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters: X

Pub Date : 2025-09-08 DOI: 10.1016/j.mlblux.2025.100257

Azkar Saeed Ahmad , Zhuoyang Yu , Sizhe Wang , Tong Weng , Wenting Lu , Baihong Sun , Jiewu Song , Qian Zhang , Martin Kunz , Bihan Wang , Elissaios Stavrou

We report the synthesis of the AuGa₂ intermetallic compound, using a direct reaction of the relevant elements at room temperature and at very low pressure. The pressure needed for the synthesis is ≈ 0.1 GPa, that is at the lower limit of modern large volume presses, routinely used to synthesize other commercially available materials. This study presents a new method of synthesizing AuGa₂, which is much more cost efficient and environmentally friendly than the previously used high-temperature synthesis techniques, and will open new possibilities of synthesizing other intermetallic compounds using high-pressure athermal techniques.

我们报道了在室温和极低压力下，利用相关元素的直接反应合成了AuGa2金属间化合物。合成所需的压力为≈0.1 GPa，这是现代大容量压力机的下限，通常用于合成其他市售材料。本研究提出了一种新的合成AuGa2的方法，该方法比以前使用的高温合成技术更具成本效益和环境友好性，并将为利用高压非热技术合成其他金属间化合物开辟新的可能性。

引用次数: 0

A novel method to fabricate elastin/collagen fiber composites: Proof of concept 一种制造弹性蛋白/胶原纤维复合材料的新方法：概念验证

IF 2.6 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters: X

Pub Date : 2025-09-06 DOI: 10.1016/j.mlblux.2025.100255

Kosuke Shinokawa , Ayae Sugawara-Narutaki , Jeonghyun Kim , Takeo Matsumoto , Eijiro Maeda

Collagen and elastin are the main fibrous proteins of load-bearing soft tissues, conferring extensibility and strength upon those tissues through their interactions. However, to date, only a few techniques have been developed to fabricate fiber composites made from these proteins. Here we present an original method of fabricating fibrous composites of collagen and elastin and characterize their mechanical behavior. Soluble elastin was electrospun to form a sheet of elastin fibers, which was rolled and submerged in an acidic solution of collagen to permit collagen infiltration. The construct was incubated at 37 °C for 1 h so that collagen fibers self-assembled into the elastin fiber network, forming an elastin/collagen fiber composite. Simultaneous application of static mechanical loading and a chemical cross-linker, genipin, to the construct for an additional 24 h was also performed for fiber alignment. SEM observation revealed that elastin and collagen fibers were well integrated, although effects of mechanical loading to align those fibers were not observed. These elastin/collagen fiber composites possessed mechanical properties between those of collagen and elastin. Tensile properties benefited from collagen, whereas viscoelastic properties were derived from elastin. This method can be applied to development of artificial replacements of load-bearing soft tissues, such as tendon and meniscus.

胶原蛋白和弹性蛋白是承重软组织的主要纤维蛋白，通过它们的相互作用赋予这些组织延展性和强度。然而，到目前为止，只有少数技术被开发出来制造由这些蛋白质制成的纤维复合材料。本文提出了一种制备胶原蛋白和弹性蛋白纤维复合材料的新方法，并对其力学性能进行了表征。可溶性弹性蛋白被电纺成一层弹性蛋白纤维，把它卷起来，浸入酸性的胶原蛋白溶液中，使胶原蛋白浸润。将构建物在37℃下孵育1 h，使胶原纤维自组装成弹性蛋白纤维网络，形成弹性蛋白/胶原纤维复合物。同时应用静态机械载荷和化学交联剂genipin对结构进行额外的24小时，以进行纤维对准。扫描电镜观察显示，弹性蛋白和胶原纤维很好地结合在一起，尽管没有观察到机械载荷对这些纤维排列的影响。弹性蛋白/胶原纤维复合材料具有介于胶原蛋白和弹性蛋白之间的力学性能。拉伸性能得益于胶原蛋白，而粘弹性性能源于弹性蛋白。该方法可应用于开发人工替代承重软组织，如肌腱和半月板。

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引用次数: 0

Formation of Mn4Si7 thin films by solid-phase ion-plasma method and improvement of their thermoelectric and electrophysical properties 固相离子等离子体法制备Mn4Si7薄膜及其热电和电物理性能的改善

IF 2.6 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters: X

Pub Date : 2025-08-14 DOI: 10.1016/j.mlblux.2025.100254

M.T. Normuradov , I.R. Bekpulatov , V.V. Klechkovskaya , Kim Ki Buem , B.D. Igamov , M.S. Lukasov , Gunel Imanova , E.A. Kerimov , Sh.A. Zeynalov

In this study, Mn₄Si₇ thermoelectric thin films were deposited on Si(111) and SiO₂/Si(111) substrates via magnetron sputtering, and their microstructural as well as electrical temperature-dependent properties were thoroughly investigated. The as-deposited films at room temperature exhibited an amorphous structure, which underwent a phase transition to a polycrystalline state upon annealing at 800 K. This annealing process resulted in a significant reduction of surface defects and the formation of a continuous film composed of nanocrystallites with dimensions in the range of 50–100 nm. The presence of the SiO₂ dielectric layer on the substrate induced distinct variations in the film’s microstructure and density, which in turn affected its electrical resistivity and thermoelectric performance. The enhancement of thermoelectric properties observed during the amorphous-to-crystalline phase transition is attributed to the selective scattering mechanism of charge carriers at nanocluster boundaries. These findings provide a critical foundation for achieving high-performance Mn₄Si₇-based thermoelectric thin films and expand their potential applications in thermoelectric devices, paving the way for the development of next-generation energy conversion materials.

在本研究中，通过磁控溅射在Si（111）和SiO2/Si（111）衬底上沉积了Mn4Si7热电薄膜，并对其微观结构和电学温度依赖性进行了深入研究。在室温下沉积的薄膜呈现出非晶结构，在800 K下退火后，薄膜经历了向多晶态的相变。这种退火工艺显著减少了表面缺陷，并形成了由尺寸在50-100 nm范围内的纳米晶体组成的连续薄膜。衬底上SiO2介电层的存在引起薄膜微观结构和密度的明显变化，从而影响其电阻率和热电性能。在非晶晶相变过程中观察到的热电性能的增强归因于纳米团簇边界上载流子的选择性散射机制。这些发现为实现高性能基于mn4si7的热电薄膜和扩大其在热电器件中的潜在应用提供了关键基础，为下一代能量转换材料的开发铺平了道路。

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引用次数: 0

Effect of austenitizing temperature on microstructure and mechanical properties of medium carbon spring steel 奥氏体化温度对中碳钢组织和力学性能的影响

IF 2.6 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters: X

Pub Date : 2025-08-04 DOI: 10.1016/j.mlblux.2025.100251

Qian Yu , Yuliang Zhao , Feiyu Zhao

The influence of austenitizing temperature on the microstructure and mechanical properties of medium carbon spring steel was systematically studied. Microstructural characterization showed that decreasing the austenitizing temperature from 900 °C to 860 °C effectively refined prior austenite grains from 8.8 μm to 5.3 μm, reduced martensite block thickness from 0.9 μm to 0.7 μm, and increased the fraction of high-angle grain boundaries (HAGBs) from 70 % to 76 %. Crystallographic variant analysis revealed increased boundary densities for V1&V2, V1&V3(V5), V1&V4, and V1&V6 pairs in the 860 °C sample with refined PAGS, along with elevated frequencies of V1&V3(V5) and V1&V6 pairs classified as HAGBs, consistent with the K-S orientation relationship. These results demonstrate that reducing the austenitizing temperature from 900 °C to 860 °C significantly affects martensite block size, HAGB fraction, and crystallographic variant pairs, leading to enchanced yield strength from 1563 MPa to 1648 MPa and total elongation from 9.3 % to 9.7 %.

系统研究了奥氏体化温度对中碳弹簧钢组织和力学性能的影响。显微组织表征表明，当奥氏体化温度从900℃降低到860℃时，奥氏体晶粒从8.8 μm细化到5.3 μm，马氏体块厚度从0.9 μm减小到0.7 μm，高角度晶界（HAGBs）比例从70%增加到76%。晶体变异分析显示，在860°C的样品中，经过改进的PAGS， V1&V2、V1&V3（V5）、V1&；V4和V1&；V6对的边界密度增加，并且V1&；V3（V5）和V1&；V6对被分类为HAGBs的频率增加，与K-S取向关系一致。结果表明，当奥氏体化温度从900℃降低到860℃时，马氏体块尺寸、HAGB分数和晶体变异对显著提高，屈服强度从1563 MPa提高到1648 MPa，总伸长率从9.3%提高到9.7%。

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全部化学•材料生命科学医学物理工程技术环境•农林材料科学地球科学法学管理学化学环境科学与生态学计算机科学教育学经济学农林科学人文科学生物学数学物理与天体物理心理学综合性期刊其他工业工程理学历史学农学文学信息工程

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