Pub Date : 2024-11-10DOI: 10.1016/j.matlet.2024.137703
Haifeng Zhai , Wei Jiang , Haonan Wu , Donghu Li , Yang Wang
The effect of scanning strategies on defect distribution and mechanical properties of additive-manufactured (AM) 316L stainless steel components was investigated. Three scanning strategies (A1-stripe, A2-loop, A3-chessboard) were applied to study the defect characteristics using X-ray microscopy (XRM) and evaluate the resulting mechanical behavior through tensile tests. The results indicate that the chessboard strategy produces fewer, smaller, and more uniform defects, contributing to superior tensile strength and reduced anisotropy. In contrast, the loop strategy results in a higher density of elongated defects near the surface, leading to increased stress concentrations and lower tensile performance. This study provides insights into optimizing scanning strategies to enhance defect control, thereby improving the overall mechanical properties of 316L stainless steel in additive manufacturing. These findings are instrumental in advancing the process design for defect mitigation and structural integrity in AM components.
研究了扫描策略对添加剂制造（AM）316L 不锈钢部件的缺陷分布和机械性能的影响。采用三种扫描策略（A1-条纹、A2-环形、A3-棋盘），使用 X 射线显微镜（XRM）研究缺陷特征，并通过拉伸试验评估由此产生的机械性能。结果表明，棋盘式策略产生的缺陷更少、更小、更均匀，因此抗拉强度更高，各向异性更小。相比之下，环形策略会在表面附近产生更高密度的细长缺陷，导致应力集中增加，拉伸性能降低。这项研究为优化扫描策略以加强缺陷控制，从而改善增材制造中 316L 不锈钢的整体机械性能提供了启示。这些发现有助于推进工艺设计，以减少增材制造部件中的缺陷和结构完整性。
{"title":"The effect of scanning strategies on the defect distribution and mechanical properties of additive manufactured 316L stainless steel components","authors":"Haifeng Zhai , Wei Jiang , Haonan Wu , Donghu Li , Yang Wang","doi":"10.1016/j.matlet.2024.137703","DOIUrl":"10.1016/j.matlet.2024.137703","url":null,"abstract":"<div><div>The effect of scanning strategies on defect distribution and mechanical properties of additive-manufactured (AM) 316L stainless steel components was investigated. Three scanning strategies (A1-stripe, A2-loop, A3-chessboard) were applied to study the defect characteristics using X-ray microscopy (XRM) and evaluate the resulting mechanical behavior through tensile tests. The results indicate that the chessboard strategy produces fewer, smaller, and more uniform defects, contributing to superior tensile strength and reduced anisotropy. In contrast, the loop strategy results in a higher density of elongated defects near the surface, leading to increased stress concentrations and lower tensile performance. This study provides insights into optimizing scanning strategies to enhance defect control, thereby improving the overall mechanical properties of 316L stainless steel in additive manufacturing. These findings are instrumental in advancing the process design for defect mitigation and structural integrity in AM components.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137703"},"PeriodicalIF":2.7,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656541","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}
Pub Date : 2024-11-09DOI: 10.1016/j.matlet.2024.137699
M. Slimi , N. Khitouni , A.S. Alnafisah , M. Khitouni , J.J. Suñol
The effects of phosphorus addition and milling time on the development of phases, microstructural and thermal behaviors in Ni50Cu40-x(Fe2B)10Px (x = 10, 20, and 30at.%) prepared via mechanical alloying, were examined by scanning electron microscopy, X-ray diffraction, and differential scanning calorimetry techniques. As the phosphorous content and milling time rise, the crystallite size gets finer and the microstrains become more significant. Furthermore, P addition promotes the amorphous phase and subsequent supersaturated solid solution Ni(Cu,Fe,P) by the simultaneous occurrence of amorphization and recrystallization phenomena. Thermal study shows the complexity of the behavior as a function of the phosphorus content associated with the restoration of defects and the recrystallization of intermediate phases.
{"title":"Effect of phosphorus additions and milling time on the mechanosynthesis of Ni50Cu40-x(Fe2B)10Px alloys","authors":"M. Slimi , N. Khitouni , A.S. Alnafisah , M. Khitouni , J.J. Suñol","doi":"10.1016/j.matlet.2024.137699","DOIUrl":"10.1016/j.matlet.2024.137699","url":null,"abstract":"<div><div>The effects of phosphorus addition and milling time on the development of phases, microstructural and thermal behaviors in Ni<sub>50</sub>Cu<sub>40-x</sub>(Fe<sub>2</sub>B)<sub>10</sub>P<sub>x</sub> (x = 10, 20, and 30at.%) prepared via mechanical alloying, were examined by scanning electron microscopy, X-ray diffraction, and differential scanning calorimetry techniques. As the phosphorous content and milling time rise, the crystallite size gets finer and<!--> <!-->the microstrains become more significant. Furthermore, P addition promotes the amorphous phase and subsequent supersaturated solid solution Ni(Cu,Fe,P) by the simultaneous occurrence of amorphization and recrystallization phenomena. Thermal study shows the complexity of the behavior as a function of the phosphorus content associated with the restoration of defects and the recrystallization of intermediate phases.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137699"},"PeriodicalIF":2.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656545","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}
Pub Date : 2024-11-09DOI: 10.1016/j.matlet.2024.137700
Fulin Xu , Kairui Fu , Jiamei Wang , Wenjian Yu , Yanjie Li , Ziyan Liu , Jingui Wang
Hierarchically porous zeolites with both macroporous/mesoporous and microporous channels have received significant attention due to their better catalytic performance than that of conventional zeolites. Here, for the first time, a template with hydrolysable groups that can achieve in-situ regulation of the pH value has been designed. Employing this novel template, core–shell hierarchically porous ZSM-5 zeolites with Al-rich shells were one-step synthesized, which exhibit better catalytic activity and selectivity than conventional microporous zeolites in bulky-molecule catalysis.
{"title":"A core–shell hierarchically porous ZSM-5 zeolite with an Al-rich shell synthesized by using hydrolysable templates","authors":"Fulin Xu , Kairui Fu , Jiamei Wang , Wenjian Yu , Yanjie Li , Ziyan Liu , Jingui Wang","doi":"10.1016/j.matlet.2024.137700","DOIUrl":"10.1016/j.matlet.2024.137700","url":null,"abstract":"<div><div>Hierarchically porous zeolites with both macroporous/mesoporous and microporous channels have received significant attention due to their better catalytic performance than that of conventional zeolites. Here, for the first time, a template with hydrolysable groups that can achieve in-situ regulation of the pH value has been designed. Employing this novel template, core–shell hierarchically porous ZSM-5 zeolites with Al-rich shells were one-step synthesized, which exhibit better catalytic activity and selectivity than conventional microporous zeolites in bulky-molecule catalysis.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137700"},"PeriodicalIF":2.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656599","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}
Pub Date : 2024-11-09DOI: 10.1016/j.matlet.2024.137686
Yanping Zheng, Xingfang Luo, Ce Hu, Zhenzhen Jiang, Cailei Yuan, Hang Zhou
The surface defect and interfacial states in nanoparticles have strong carrier trapping capacity and are closely related to the charge storage capacity and life of nanoparticles memory devices. In this work, solid and hollow CoO nanoparticles confined in amorphous HfO2 high dielectric thin film with similar size and density were synthesized and characterized, and the effect of interfacial state regulation of nanoparticles on charge storage performance of memory capacitors was studied by comparing the experimental data of the two samples. A larger memory window was observed in the memory capacitor based on hollow CoO nanoparticles comparing to the solid one, which is attributed to an abundant of defects originated from the surface and grain boundaries of CoO nanoparticles with hollow structure. Artificially controlling surface defects and interface states of nanoparticles from the nano-floating gate memory is of great significance in the development of memory devices.
{"title":"Modulation on interfacial states for the improved charge storage performance in HfO2 matrix embedded CoO nanoparticles-based memory capacitors","authors":"Yanping Zheng, Xingfang Luo, Ce Hu, Zhenzhen Jiang, Cailei Yuan, Hang Zhou","doi":"10.1016/j.matlet.2024.137686","DOIUrl":"10.1016/j.matlet.2024.137686","url":null,"abstract":"<div><div>The surface defect and interfacial states in nanoparticles have strong carrier trapping capacity and are closely related to the charge storage capacity and life of nanoparticles memory devices. In this work, solid and hollow CoO nanoparticles confined in amorphous HfO<sub>2</sub> high dielectric thin film with similar size and density were synthesized and characterized, and the effect of interfacial state regulation of nanoparticles on charge storage performance of memory capacitors was studied by comparing the experimental data of the two samples. A larger memory window was observed in the memory capacitor based on hollow CoO nanoparticles comparing to the solid one, which is attributed to an abundant of defects originated from the surface and grain boundaries of CoO nanoparticles with hollow structure. Artificially controlling surface defects and interface states of nanoparticles from the nano-floating gate memory is of great significance in the development of memory devices.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137686"},"PeriodicalIF":2.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656538","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}
Pub Date : 2024-11-09DOI: 10.1016/j.matlet.2024.137698
Tathagata Kar, Israel Martínez Díaz, Maura Casales-Díaz, José Juan Ramos-Hernández, María Fernanda Flores-Rodríguez, Thangamani Jayaram Gounder, Ramiro Pérez, Mohan Kumar Kesarla
Carbon nanofibers are rapidly emerging as efficient electrode materials for energy storage. Given this, we established a simple in-situ technique to grow zeolitic imidazolate framework (ZIF8) particles on electrospun polyacrylonitrile (PAN)–polyvinylpyrrolidone (PVP) nanofibers. Our systematic experiments indicate that the PAN/PVP/ZIF8 (PPZ8) nanofibers carbonized at 800–900 °C (C|PPZ8-800/900) are electrochemically capacitive. The C|PPZ8-800/900 samples exhibit the maximum specific capacitance values (∼180.69 F·g−1) and excellent electrochemical stability (∼100 %) in 1.0 M H2SO4. Incorporation of ZIF8 particles induces a mesoporous behaviour in the PPZ8 composite during carbonization and allows the nanofibers to retain their structural stability. The degree of graphitization and traces of metallic-Zn (contributing towards lower charge-transfer resistance) in the tested C|PPZ8 nanofiber composites significantly affects their electrochemical capacitive performance.
碳纳米纤维正迅速成为高效的储能电极材料。有鉴于此，我们建立了一种简单的原位技术，在电纺聚丙烯腈（PAN）-聚乙烯吡咯烷酮（PVP）纳米纤维上生长唑族咪唑酸框架（ZIF8）颗粒。我们的系统实验表明，在 800-900 °C 下碳化的 PAN/PVP/ZIF8 (PPZ8) 纳米纤维（C|PPZ8-800/900）具有电化学电容性。C|PPZ8-800/900 样品在 1.0 M H2SO4 中显示出最大的比电容值（∼180.69 F-g-1）和优异的电化学稳定性（∼100 %）。在碳化过程中，ZIF8 颗粒的加入诱导了 PPZ8 复合材料的介孔行为，并使纳米纤维保持了结构稳定性。测试的 C|PPZ8 纳米纤维复合材料中的石墨化程度和金属锌的痕迹（有助于降低电荷转移电阻）会显著影响其电化学电容性能。
{"title":"Carbonized zeolitic imidazolate framework-incorporated electrospun polymeric nanofiber composite for supercapacitor applications","authors":"Tathagata Kar, Israel Martínez Díaz, Maura Casales-Díaz, José Juan Ramos-Hernández, María Fernanda Flores-Rodríguez, Thangamani Jayaram Gounder, Ramiro Pérez, Mohan Kumar Kesarla","doi":"10.1016/j.matlet.2024.137698","DOIUrl":"10.1016/j.matlet.2024.137698","url":null,"abstract":"<div><div>Carbon nanofibers are rapidly emerging as efficient electrode materials for energy storage. Given this, we established a simple <em>in-situ</em> technique to grow zeolitic imidazolate framework (ZIF8) particles on electrospun polyacrylonitrile (PAN)–polyvinylpyrrolidone (PVP) nanofibers. Our systematic experiments indicate that the PAN/PVP/ZIF8 (PPZ8) nanofibers carbonized at 800–900 °C (C|PPZ8-800/900) are electrochemically capacitive. The C|PPZ8-800/900 samples exhibit the maximum specific capacitance values (∼180.69 F·g<sup>−1</sup>) and excellent electrochemical stability (∼100 %) in 1.0 M H<sub>2</sub>SO<sub>4</sub>. Incorporation of ZIF8 particles induces a mesoporous behaviour in the PPZ8 composite during carbonization and allows the nanofibers to retain their structural stability. The degree of graphitization and traces of metallic-Zn (contributing towards lower charge-transfer resistance) in the tested C|PPZ8 nanofiber composites significantly affects their electrochemical capacitive performance.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137698"},"PeriodicalIF":2.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-07DOI: 10.1016/j.matlet.2024.137669
Bingtian Li , Ziyao Chen , ZhenJie Guan , Runchen Yang , Weijian Li , Liang Zhen , Wenzhu Shao
Copper/carbon (C/Cu) electrical contact materials are widely used in low-voltage appliances due to their exceptional conductivity and anti-ablation properties. However, the oxidation of Cu during operation and the suboptimal wettability at the C/Cu interface negatively impact its arc-resistant performance. This study explores the potential for enhancing the arc-resistant characteristics of C/Cu electrical contact materials through the alloying of La in Cu. The findings indicate that La alloying in Cu significantly decreases the contact resistance (from 50 mΩ to 2.2 mΩ) and mass loss (by 50%) of C/Cu electrical contact materials.
铜/碳（C/Cu）电触点材料因其优异的导电性和抗烧蚀性能而广泛应用于低压电器中。然而，铜在工作过程中会发生氧化，C/Cu 接口的润湿性也不理想，这对其耐电弧性能产生了负面影响。本研究探讨了通过在铜中合金化 La 来提高 C/Cu 电接触材料耐电弧性能的潜力。研究结果表明，在铜中加入 La 合金可显著降低 C/Cu 电接触材料的接触电阻（从 50 mΩ 降至 2.2 mΩ）和质量损失（50%）。
{"title":"Unraveling the new role of La on arc erosion behavior of C/Cu-based electrical contacts","authors":"Bingtian Li , Ziyao Chen , ZhenJie Guan , Runchen Yang , Weijian Li , Liang Zhen , Wenzhu Shao","doi":"10.1016/j.matlet.2024.137669","DOIUrl":"10.1016/j.matlet.2024.137669","url":null,"abstract":"<div><div>Copper/carbon (C/Cu) electrical contact materials are widely used in low-voltage appliances due to their exceptional conductivity and anti-ablation properties. However, the oxidation of Cu during operation and the suboptimal wettability at the C/Cu interface negatively impact its arc-resistant performance. This study explores the potential for enhancing the arc-resistant characteristics of C/Cu electrical contact materials through the alloying of La in Cu. The findings indicate that La alloying in Cu significantly decreases the contact resistance (from 50 mΩ to 2.2 mΩ) and mass loss (by 50%) of C/Cu electrical contact materials.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137669"},"PeriodicalIF":2.7,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656626","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}
Pub Date : 2024-11-07DOI: 10.1016/j.matlet.2024.137689
Zhenzhe Li , Bowan Tao , Ruipeng Zhao , Kai Yang , Xi Chen , Tian Xie , Mingyuan Zhao , Yudong Xia
The YBa2Cu3O7-δ-based atomic layer thermopile (ALTP) heat flux sensor, characterized by its high response frequency, has been utilized in scale-model testing within hypersonic ground-based facilities to detect the unsteady fluctuating heat flux caused by the laminar-to-turbulent boundary-layer transition. However, the insert-assembled method and typical single crystal substrate lead to complex operational procedures and measurement inaccuracies. Consequently, preparing high-orientation, c-axis inclined YBCO films on flexible substrate may provide a viable solution for accommodating the irregular surface of models. In this work, the c-axis inclined YBCO films were successfully epitaxially grown on the unoriented metal-based flexible substrate by incorporating the MgO template layer. The epitaxial quality is closely associated with the deposition temperature, where the good crystal quality and biaxial texture (Δχ = 4.31°, Δφ = 10.86°) are obtained under the proper temperature. Additionally, the remarkable transverse thermoelectric effect performance further indicates the successful epitaxial growth of the YBCO sensitive film.
{"title":"The preparation of inclined c-axis YBa2Cu3O7-δ sensitive film with the transverse thermoelectric effect based on the flexible metal-based substrate","authors":"Zhenzhe Li , Bowan Tao , Ruipeng Zhao , Kai Yang , Xi Chen , Tian Xie , Mingyuan Zhao , Yudong Xia","doi":"10.1016/j.matlet.2024.137689","DOIUrl":"10.1016/j.matlet.2024.137689","url":null,"abstract":"<div><div>The YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub>-based atomic layer thermopile (ALTP) heat flux sensor, characterized by its high response frequency, has been utilized in scale-model testing within hypersonic ground-based facilities to detect the unsteady fluctuating heat flux caused by the laminar-to-turbulent boundary-layer transition. However, the insert-assembled method and typical single crystal substrate lead to complex operational procedures and measurement inaccuracies. Consequently, preparing high-orientation, <em>c</em>-axis inclined YBCO films on flexible substrate may provide a viable solution for accommodating the irregular surface of models. In this work, the <em>c</em>-axis inclined YBCO films were successfully epitaxially grown on the unoriented metal-based flexible substrate by incorporating the MgO template layer. The epitaxial quality is closely associated with the deposition temperature, where the good crystal quality and biaxial texture (<em>Δχ</em> = 4.31°, <em>Δφ</em> = 10.86°) are obtained under the proper temperature. Additionally, the remarkable transverse thermoelectric effect performance further indicates the successful epitaxial growth of the YBCO sensitive film.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137689"},"PeriodicalIF":2.7,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656534","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}
Pub Date : 2024-11-07DOI: 10.1016/j.matlet.2024.137692
Peng Zhong , Jiacheng Wang , Jie Zhu , Haoran Lin , Lin Li , Xiaoming Lin , Yuchen Zheng , Hao Yang , Lei Hu
Enhancing the electrocatalytic performance of transition-metal oxide catalysts by optimizing the active center at the multi-component heterointerface is a daunting task. Herein, the three-component ZnO/Co3O4/CuO heterostructure composite catalyst was effectively produced through a room-temperature precipitation reaction, followed by calcination in air. The ZnO/Co3O4/CuO ternary heterostructure catalyst showed superior oxygen evolution reaction (OER) performance, characterized by a low overpotential (312 mV at 10 mA cm−2) and Tafel slope (83.5 mV dec-1) compared to the ZnO, Co3O4, ZnO/CuO, ZnO/Co3O4, and Co3O4/CuO catalysts. The research shows that the property of electrocatalytic oxygen evolution is greatly enhanced due to the combined impact of each component.
{"title":"Ternary ZnO/Co3O4/CuO heterostructure nanocomposites derived from trimetallic metal-organic frameworks for efficient electrocatalytic water oxidation","authors":"Peng Zhong , Jiacheng Wang , Jie Zhu , Haoran Lin , Lin Li , Xiaoming Lin , Yuchen Zheng , Hao Yang , Lei Hu","doi":"10.1016/j.matlet.2024.137692","DOIUrl":"10.1016/j.matlet.2024.137692","url":null,"abstract":"<div><div>Enhancing the electrocatalytic performance of transition-metal oxide catalysts by optimizing the active center at the multi-component heterointerface is a daunting task. Herein, the three-component ZnO/Co<sub>3</sub>O<sub>4</sub>/CuO heterostructure composite catalyst was effectively produced through a room-temperature precipitation reaction, followed by calcination in air. The ZnO/Co<sub>3</sub>O<sub>4</sub>/CuO ternary heterostructure catalyst showed superior oxygen evolution reaction (OER) performance, characterized<!--> <!-->by a low overpotential (312 mV at 10 mA cm<sup>−2</sup>) and Tafel slope (83.5 mV dec<sup>-1</sup>) compared to the ZnO, Co<sub>3</sub>O<sub>4</sub>, ZnO/CuO, ZnO/Co<sub>3</sub>O<sub>4</sub>, and Co<sub>3</sub>O<sub>4</sub>/CuO catalysts. The research shows that the property of electrocatalytic oxygen evolution is greatly enhanced due to the combined impact of each component.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137692"},"PeriodicalIF":2.7,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656531","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}
Pub Date : 2024-11-07DOI: 10.1016/j.matlet.2024.137687
Ying-Ying Qiao , Yang-Yang Si , Jie Liu , Zhi-Qiang Wu , Cang Liu , Qing Li , Long Yuan
Zr-bcu-22bipy44dc, which features a LUMO positioned closer to the VB of In2S3, was utilized to assemble a S-Scheme heterojunction IS-Zr-MOF. Due to the appropriate band structure dislocation, the optical-electronic properties have been notably optimized. The photocatalytic reduction efficiency of IS-Zr-MOF-2 for Cr2O72- has achieved 98.6 % just within 30 min, under 500 W xenon lamp. It also displays effective degradation ability towards reactive dyes RB13, RB21 and RR15, under 500 W mercury lamp. This study presents a practical approach to create novel bi-functional photocatalysts for remediation of water environment.
Zr-bcu-22bipy44dc 的 LUMO 位置更接近 In2S3 的 VB，被用来组装 S 型异质结 IS-Zr-MOF。由于适当的带状结构错位，光电子特性得到了显著优化。在 500 W 的氙灯照射下，IS-Zr-MOF-2 对 Cr2O72- 的光催化还原效率在 30 分钟内就达到了 98.6%。在 500 W 汞灯下，IS-Zr-MOF-2 还能有效降解活性染料 RB13、RB21 和 RR15。这项研究提出了一种实用的方法，可用于制造新型双功能光催化剂来修复水环境。
{"title":"Assembly of S-Scheme heterojunction In2S3/Zr-bcu-22bipy44dc: Optimize the optical-electronic properties for highly efficient photochemical decontamination of Cr(VI) ions and dyes","authors":"Ying-Ying Qiao , Yang-Yang Si , Jie Liu , Zhi-Qiang Wu , Cang Liu , Qing Li , Long Yuan","doi":"10.1016/j.matlet.2024.137687","DOIUrl":"10.1016/j.matlet.2024.137687","url":null,"abstract":"<div><div>Zr-<strong><em>bcu</em></strong>-22bipy44dc, which features a LUMO positioned closer to the VB of In<sub>2</sub>S<sub>3</sub>, was utilized to assemble a S-Scheme heterojunction IS-Zr-MOF. Due to the appropriate band structure dislocation, the optical-electronic properties have been notably optimized. The photocatalytic reduction efficiency of IS-Zr-MOF-2 for Cr<sub>2</sub>O<sub>7</sub><sup>2-</sup> has achieved 98.6 % just within 30 min, under 500 W xenon lamp. It also displays effective degradation ability towards reactive dyes RB13, RB21 and RR15, under 500 W mercury lamp. This study presents a practical approach to create novel bi-functional photocatalysts for remediation of water environment.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137687"},"PeriodicalIF":2.7,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656601","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}
Pub Date : 2024-11-07DOI: 10.1016/j.matlet.2024.137641
Oraib Al-Ketan
The rapid advancement in electronic devices has heightened thermal management challenges. This study presents the fabrication of 3D micro-architected heatsinks using additive manufacturing (AM) assisted casting. This approach merges AM’s design flexibility with casting’s cost-effectiveness and versatility, enabling complex heatsink geometries. The fabricated heatsinks were analyzed using scanning electron microscopy and computed tomography. The thermal behavior of the heatsinks was assessed in forced convection conditions. A temperature drop at the base ranging from 5% to 13% was measured.
电子设备的快速发展加剧了热管理方面的挑战。本研究介绍了利用增材制造（AM）辅助铸造技术制造三维微架构散热片的方法。这种方法将 AM 的设计灵活性与铸造的成本效益和多功能性相结合，从而实现了复杂的散热片几何形状。使用扫描电子显微镜和计算机断层扫描对制造的散热片进行了分析。在强制对流条件下，对散热片的热行为进行了评估。测量结果显示，散热片底部的温度下降了 5% 至 13%。
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