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An ultra-wideband electromagnetic shielding concrete based on multi-scale conductive fillers 基于多尺度导电填料的超宽带电磁屏蔽混凝土
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-07-09 DOI: 10.1016/j.matlet.2025.139080
Yingxiang Wang , Chao Ma , Shuai Xie , Zihao Wu , Zhijiang Ji
{"title":"An ultra-wideband electromagnetic shielding concrete based on multi-scale conductive fillers","authors":"Yingxiang Wang ,&nbsp;Chao Ma ,&nbsp;Shuai Xie ,&nbsp;Zihao Wu ,&nbsp;Zhijiang Ji","doi":"10.1016/j.matlet.2025.139080","DOIUrl":"10.1016/j.matlet.2025.139080","url":null,"abstract":"<div><div>In order to address the challenge of balancing strength and high shielding performance in concrete, an ultra-wideband electromagnetic shielding concrete was developed in this work by incorporating nano-scale carbon black, micro-scale graphite, and millimeter-scale steel fibers to construct a multi-scale hierarchical conductive network. The results demonstrate that the shielding concrete exhibits excellent mechanical and shielding properties. The electrical conductivity of the shielding concrete reaches up to 0.17 S/m. In the MHz frequency range, the average SE exceeds 30 dB, while in the GHz range, the SE is significantly higher, ranging between 65–109 dB. Meanwhile, the 28-day compressive strength of the shielding concrete remains above 45 MPa, complying with the Chinese National Standard GB50010.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"399 ","pages":"Article 139080"},"PeriodicalIF":2.7,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144611744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Enhanced visible-light hydrogen evolution by conjugation and methyl engineering in sulfone-containing β-Ketoenamine COFs 用偶联和甲基工程技术增强含砜β-酮胺COFs的可见光析氢
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-07-08 DOI: 10.1016/j.matlet.2025.139070
Yusei Kobayashi , Ikki Tateishi , Monir Uzzaman , Hideyuki Katsumata , Mai Furukawa , Satoshi Kaneco
{"title":"Enhanced visible-light hydrogen evolution by conjugation and methyl engineering in sulfone-containing β-Ketoenamine COFs","authors":"Yusei Kobayashi ,&nbsp;Ikki Tateishi ,&nbsp;Monir Uzzaman ,&nbsp;Hideyuki Katsumata ,&nbsp;Mai Furukawa ,&nbsp;Satoshi Kaneco","doi":"10.1016/j.matlet.2025.139070","DOIUrl":"10.1016/j.matlet.2025.139070","url":null,"abstract":"<div><div>Sulfone-containing β-ketoenamine COFs (Covalent Organic Frameworks) with varying linker structures were synthesized using Tp as the backbone to investigate their photocatalytic hydrogen evolution activity. Among them, TpTSN-COF, featuring extended π-conjugation and methyl groups, showed a stable hydrogen evolution rate of 6590 μmol g<sup>-1</sup>h<sup>−1</sup> under visible light twice the rate of TpBS-COF (without methyl groups) and over 600 times higher than that of TpSDA-COF (without conjugate extension and methyl groups). The enhanced performance is attributed to reduced charge recombination via conjugate extension and improved charge transfer enabled by introduction of methyl group.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"399 ","pages":"Article 139070"},"PeriodicalIF":2.7,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144596910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Hydrophobicity of periodic structures on 7075 aluminum alloy surfaces induced by femtosecond laser 飞秒激光诱导7075铝合金表面周期性结构的疏水性
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-07-08 DOI: 10.1016/j.matlet.2025.139074
Si Li, Kai Zhang, Tianqi Chen, Weijun Liu
{"title":"Hydrophobicity of periodic structures on 7075 aluminum alloy surfaces induced by femtosecond laser","authors":"Si Li,&nbsp;Kai Zhang,&nbsp;Tianqi Chen,&nbsp;Weijun Liu","doi":"10.1016/j.matlet.2025.139074","DOIUrl":"10.1016/j.matlet.2025.139074","url":null,"abstract":"<div><div>Femtosecond lasers were used to induce periodic surface structures on 7075 aluminum alloy, with wettability investigated by varying the scanning speed to create structures of different periods. Results showed that under specific conditions, laser induced periodic surface structures (LIPSS) could switch the material’s surface from hydrophilic to hydrophobic. As the scanning speed increased, hydrophobicity rose, with the static contact angle reaching a maximum of 162°, indicating a superhydrophobic state. This shows that LIPSS can enhance the hydrophobicity of 7075 aluminum alloy, boosting its application value in fields like aerospace and automotive manufacturing.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"399 ","pages":"Article 139074"},"PeriodicalIF":2.7,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144596909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
One-step synthesis of CeO2/rGO composites for high performance lithium-sulfur batteries 一步法合成高性能锂硫电池用CeO2/rGO复合材料
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-07-08 DOI: 10.1016/j.matlet.2025.139076
Haijing Zheng , Cen Yao , Nurbia Yusuyun , Mayila Maimitizi , Miaomiao Tian , Liping Zhao
{"title":"One-step synthesis of CeO2/rGO composites for high performance lithium-sulfur batteries","authors":"Haijing Zheng ,&nbsp;Cen Yao ,&nbsp;Nurbia Yusuyun ,&nbsp;Mayila Maimitizi ,&nbsp;Miaomiao Tian ,&nbsp;Liping Zhao","doi":"10.1016/j.matlet.2025.139076","DOIUrl":"10.1016/j.matlet.2025.139076","url":null,"abstract":"<div><div>Lithium-sulfur batteries (LSBs) have been considered as a promising high-energy rechargeable battery system. However, their practical implementation is hindered by the insulating nature of sulfur, “shuttle effect” and sluggish polysulfides redox kinetics. In this work, CeO<sub>2</sub>/rGO composite was synthesized via one step method and subsequently combined with sulfur under liquid-phase condition to form a ternary CeO<sub>2</sub>/rGO/S hybrid for LSBs. CeO<sub>2</sub> nanoparticles were uniformly dispersed on the reduced graphene oxide carbon plane, alleviating the polysulfides shuttling due to its strong catalytic and polysulfides adsorption. The synergistic effect of CeO<sub>2</sub> and the conductive rGO network significantly enhanced the electrochemical cycling performance and stability of the sulfur cathode. These results demonstrate that this one step synthesized CeO<sub>2</sub>/rGO composite‌ serves as a promising cathode host material for LSBs.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"399 ","pages":"Article 139076"},"PeriodicalIF":2.7,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144581269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Fabrication of ultrathin Fe-metal organic framework-derived Fe3O4 all solid state battery: Developing test platform for probing the solid electrolyte/electrode interface 超薄fe -金属有机骨架衍生Fe3O4全固态电池的制备：开发用于探测固体电解质/电极界面的测试平台
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-07-08 DOI: 10.1016/j.matlet.2025.139073
Byoung-Nam Park
{"title":"Fabrication of ultrathin Fe-metal organic framework-derived Fe3O4 all solid state battery: Developing test platform for probing the solid electrolyte/electrode interface","authors":"Byoung-Nam Park","doi":"10.1016/j.matlet.2025.139073","DOIUrl":"10.1016/j.matlet.2025.139073","url":null,"abstract":"<div><div>The integration of iron-based metal–organic frameworks (Fe-MOFs) with Li<sub>1.3</sub>Al<sub>0.3</sub>Ti<sub>1.7</sub>(PO<sub>4</sub>)<sub>3</sub> (LATP) as a solid electrolyte offers a promising pathway toward high-performance, all-solid-state batteries (ASSBs) with enhanced safety and stability. In this study, we report on the fabrication and characterization of an ultrathin Fe-MOF anode interfaced with LATP, leveraging the benefits of electrophoretic deposition (EPD) to create an additive-free and well-controlled thin layer. This architecture allows for direct analysis of the solid electrolyte/electrode interface, eliminating bulk electrode effects and enabling focused investigations of interfacial phenomena critical to ASSB performance. The dominance of diffusion-controlled behavior with a <em>b</em> value of 0.5 with a diffusion coefficient of 3.9 × 10<sup>−13</sup> cm<sup>2</sup>/s arises from the intrinsic bulk redox activity of Fe<sub>3</sub>O<sub>4</sub>, the porous nature of the deposited film enabling effective ionic diffusion, and the strong interface with the LATP electrolyte, which facilitates ion transport into the bulk. This work not only highlights the potential of Fe-MOF and LATP in ASSB applications but also establishes an experimental platform for exploring and optimizing solid-state battery interfaces.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"399 ","pages":"Article 139073"},"PeriodicalIF":2.7,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144611746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Multi-task learning for joint classification and segmentation of metallographic microstructures 金相组织联合分类与分割的多任务学习
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-07-07 DOI: 10.1016/j.matlet.2025.138987
Zhihao Gao , Yintao Zhou
{"title":"Multi-task learning for joint classification and segmentation of metallographic microstructures","authors":"Zhihao Gao ,&nbsp;Yintao Zhou","doi":"10.1016/j.matlet.2025.138987","DOIUrl":"10.1016/j.matlet.2025.138987","url":null,"abstract":"<div><div>Accurate analysis of metallographic microstructures is crucial for evaluating material properties. We propose a multi-task learning framework based on a modified U-Net that jointly performs semantic segmentation and image-level classification. The model features a shared encoder and task-specific decoders, with an adaptive loss weighting mechanism for balanced optimization. Experiments on a manually annotated dataset of 200<span><math><mo>×</mo></math></span> and 500<span><math><mo>×</mo></math></span> optical images of pure iron and hypereutectoid steel show that our approach outperforms traditional and single-task baselines in terms of accuracy, boundary precision, and convergence efficiency in joint-task training scenarios. All code and data used in this study are publicly available at <span><span>https://doi.org/10.5281/zenodo.15702261</span><svg><path></path></svg></span>.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"399 ","pages":"Article 138987"},"PeriodicalIF":2.7,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
A novel α-Si3N4 nanoparticles/nanowhiskers hybrid ceramic coating PE separators for high-performance lithium-ion batteries 高性能锂离子电池用新型α-Si3N4纳米颗粒/纳米晶须杂化陶瓷涂层PE分离器
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-07-07 DOI: 10.1016/j.matlet.2025.139069
Hang Xu , Xinran Hou , Zongming Pan , Zengyu Peng , Lili Jiang , Jian Jiang , Xiaomin Li , Chuanqiang Yin , Lang Zhou
{"title":"A novel α-Si3N4 nanoparticles/nanowhiskers hybrid ceramic coating PE separators for high-performance lithium-ion batteries","authors":"Hang Xu ,&nbsp;Xinran Hou ,&nbsp;Zongming Pan ,&nbsp;Zengyu Peng ,&nbsp;Lili Jiang ,&nbsp;Jian Jiang ,&nbsp;Xiaomin Li ,&nbsp;Chuanqiang Yin ,&nbsp;Lang Zhou","doi":"10.1016/j.matlet.2025.139069","DOIUrl":"10.1016/j.matlet.2025.139069","url":null,"abstract":"<div><div>Improving the high-temperature stability and electrolyte wettability of separators is critical for high-performance lithium-ion batteries. In this study, we successfully fabricated a novel silicon nitride (Si<sub>3</sub>N<sub>4</sub>)/polyethylene (PE) separator by coating a commercial PE separator with a hybrid powder of α-Si<sub>3</sub>N<sub>4</sub> nanoparticles and nanowhiskers via the dip-coating method (referred to as PE-Si<sub>3</sub>N<sub>4NP-NW</sub> separator). PE-Si<sub>3</sub>N<sub>4NP-NW</sub> separator exhibited superior thermal stability and electrolyte wettability compared to commercial polyethylene separators. Li/LiFePO<sub>4</sub> batteries utilizing PE-Si<sub>3</sub>N<sub>4NP-NW</sub> as the separator demonstrated a high-capacity retention of 90.22% after 200 cycles and showed a high specific capacity of 97.2 mAh g<sup>-1</sup> at 8C. These outstanding properties highlight the promising potential of this innovative separator for applications in power batteries and energy storage systems.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"399 ","pages":"Article 139069"},"PeriodicalIF":2.7,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144581076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Fluorinated graphite/polydimethylsiloxane composites with superior electrical insulation 具有优异电绝缘性能的氟化石墨/聚二甲基硅氧烷复合材料
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-07-07 DOI: 10.1016/j.matlet.2025.139066
Xiquan Xiao, Peiyao Du, Zhixing Wang, Jiqiang Tu, Yongfan Lin, Jiawei Wu, Lihua Zhao, Shenli Jia, Lichuan Jia
{"title":"Fluorinated graphite/polydimethylsiloxane composites with superior electrical insulation","authors":"Xiquan Xiao,&nbsp;Peiyao Du,&nbsp;Zhixing Wang,&nbsp;Jiqiang Tu,&nbsp;Yongfan Lin,&nbsp;Jiawei Wu,&nbsp;Lihua Zhao,&nbsp;Shenli Jia,&nbsp;Lichuan Jia","doi":"10.1016/j.matlet.2025.139066","DOIUrl":"10.1016/j.matlet.2025.139066","url":null,"abstract":"<div><div>Polydimethylsiloxane (PDMS) is widely used as one key packaging materials in power electronic devices due to its good insulation and easy processability. However, it is still required to enhance the insulation performance of PDMS for its applications in modern high power electronic devices. Herein, fluorinated graphite (f-graphite) was employed as a filler to improve the insulation performance of PDMS. It was found that the resultant f-graphite/PDMS composite with 5 wt% f-graphite content exhibited a high volume resistivity of 9.9 × 10<sup>14</sup> Ω·cm, and an enhanced breakdown strength of 47.3 kV/mm, which was far superior to that of pure PDMS (3.3 × 10<sup>13</sup> Ω·cm and 37.8 kV/mm). These findings provided valuable insights into the development of high insulation PDMS materials for power electronic applications.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"399 ","pages":"Article 139066"},"PeriodicalIF":2.7,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144581078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
The anisotropy wear and tribocorrosion performances of pure titanium fabricated by laser powder bed fusion 激光粉末床熔合制备纯钛材料的各向异性磨损和摩擦腐蚀性能
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-07-07 DOI: 10.1016/j.matlet.2025.139063
Libo Zhou , Xiaotian Yang , Jinshan Sun , Jian Chen , Cong Li
{"title":"The anisotropy wear and tribocorrosion performances of pure titanium fabricated by laser powder bed fusion","authors":"Libo Zhou ,&nbsp;Xiaotian Yang ,&nbsp;Jinshan Sun ,&nbsp;Jian Chen ,&nbsp;Cong Li","doi":"10.1016/j.matlet.2025.139063","DOIUrl":"10.1016/j.matlet.2025.139063","url":null,"abstract":"<div><div>This study explored the anisotropic wear and tribocorrosion behavior of pure titanium fabricated via laser powder bed fusion (LPBF) with various building orientations (0°, 30°, 45°, 60° and 90°, denoted as samples I-V, respectively). Dry sliding induced ploughing and oxidative wear, while Hank’s solution accelerated plastic deformation via corrosion-wear synergy. Lower Schmid factor deviation (homogeneous deformation) improved wear resistance: Sample V (90°), with &lt; 0001 &gt; -textured slender martensite and Schmid factor deviation 0.35, showed the lowest wear rate (0.343 × 10<sup>−3</sup> mm<sup>3</sup>·N<sup>−1</sup>·m<sup>−1</sup> and 0.451 × 10<sup>−3</sup> mm<sup>3</sup>·N<sup>−1</sup>·m<sup>−1</sup>). These findings guide microstructure design for additive-manufactured biomedical titanium alloys.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"399 ","pages":"Article 139063"},"PeriodicalIF":2.7,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144581073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
A dopant-free polymeric hole transport material for 8.66%-efficient CuInS2 solar cells 用于8.66%效率的CuInS2太阳能电池的无掺杂聚合物空穴传输材料
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-07-07 DOI: 10.1016/j.matlet.2025.139067
Chao Dong, Ziye Yu, Jiafeng Zhou, Weili Meng
{"title":"A dopant-free polymeric hole transport material for 8.66%-efficient CuInS2 solar cells","authors":"Chao Dong,&nbsp;Ziye Yu,&nbsp;Jiafeng Zhou,&nbsp;Weili Meng","doi":"10.1016/j.matlet.2025.139067","DOIUrl":"10.1016/j.matlet.2025.139067","url":null,"abstract":"<div><div>CuInS<sub>2</sub>-based bulk heterojunction (BHJ) film is a promising photoelectric conversion material system for photovoltaics. Here, a dopant-free polymer PTB7-Th is used as a hole transport material (HTM) in CuInS<sub>2</sub>-BHJ solar cells for the first time. The morphology, optical property and electrical property of the PTB7-Th film are investigated. The CuInS<sub>2</sub>-BHJ solar cell using PTB7-Th as a HTM achieves a considerable power conversion efficiency of 8.66% and exhibits a good stability in ambient condition.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"399 ","pages":"Article 139067"},"PeriodicalIF":2.7,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144581074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
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