As a potentially effective strategy to improve the chemistry and mechanics of the interface of glass-based/steel joints for high-temperature applications, the role of three ceramic interlayers, including 8% molY2O3-ZrO2 (8YSZ), MnCo2O4 and Al2O3, was examined using thermoelastic multilayer stress modeling, aging-dependent stress evolution, and detailed chemical/microstructural characterization. Mapping the in-layer stress reveals that the thermoelastic properties of the interlayer govern the residual stress distribution in glass/steel joints, enabling the rational design of mechanically stable interfaces for high-temperature sealing systems. The combined mechanical and chemical assessments demonstrate that 8YSZ is the most reliable interlayer for suppressing detrimental seal/interconnect interactions in high-temperature operating conditions.
{"title":"Interfacial engineering of glass-ceramic/steel joints using ceramic interlayers: designing thermoelastic stress and chemical stability","authors":"Hamid Abdoli , Masood Fakouri Hasanabadi , Hamidreza Farnoush","doi":"10.1016/j.matlet.2026.140252","DOIUrl":"10.1016/j.matlet.2026.140252","url":null,"abstract":"<div><div>As a potentially effective strategy to improve the chemistry and mechanics of the interface of glass-based/steel joints for high-temperature applications, the role of three ceramic interlayers, including 8% molY<sub>2</sub>O<sub>3</sub>-ZrO<sub>2</sub> (8YSZ), MnCo<sub>2</sub>O<sub>4</sub> and Al<sub>2</sub>O<sub>3</sub>, was examined using thermoelastic multilayer stress modeling, aging-dependent stress evolution, and detailed chemical/microstructural characterization. Mapping the in-layer stress reveals that the thermoelastic properties of the interlayer govern the residual stress distribution in glass/steel joints, enabling the rational design of mechanically stable interfaces for high-temperature sealing systems. The combined mechanical and chemical assessments demonstrate that 8YSZ is the most reliable interlayer for suppressing detrimental seal/interconnect interactions in high-temperature operating conditions.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"410 ","pages":"Article 140252"},"PeriodicalIF":2.7,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187177","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 : 2026-05-01Epub Date: 2026-02-10DOI: 10.1016/j.matlet.2026.140243
Pengyu Li, Xiaohua Feng, Mingsheng Wang, Xiaotian Feng, Yi Liu, Hua Li
Understanding the role of surface layers and developing thickness-insensitive microwave absorbing coatings are critical for practical applications. In this work, short-term atomic oxygen (AO) treatment selectively reconstructs only the top ∼10 μm of a porous polyimide/BaFe₁₂O₁₉/carbon nanosphere coating, enabling effective Ku-band absorption across a broad thickness range of 2.8–3.4 mm. The AO-induced surface layer introduces defect sites and disrupts local conductive pathways, reducing electrical conductivity from 0.23 to 0.22 S/m. This suppression of conduction loss improves impedance matching, while the preserved porous interior maintains strong attenuation capability. The synergy between the reconstructed surface and the internal porous framework leads to a smoother evolution of input impedance with varying thickness-key to achieving thickness-insensitive microwave absorption. The optimized coating further exhibits enhanced electromagnetic stability, including approximately 25% greater radar cross-section (RCS) reduction and expanded polarization-insensitive angular ranges by 10° in TE mode and 20° in TM mode.
{"title":"Surface-reconstructed porous PI/BaFe12O19/CS coatings with thickness-insensitive microwave absorption","authors":"Pengyu Li, Xiaohua Feng, Mingsheng Wang, Xiaotian Feng, Yi Liu, Hua Li","doi":"10.1016/j.matlet.2026.140243","DOIUrl":"10.1016/j.matlet.2026.140243","url":null,"abstract":"<div><div>Understanding the role of surface layers and developing thickness-insensitive microwave absorbing coatings are critical for practical applications. In this work, short-term atomic oxygen (AO) treatment selectively reconstructs only the top ∼10 μm of a porous polyimide/BaFe₁₂O₁₉/carbon nanosphere coating, enabling effective <em>Ku</em>-band absorption across a broad thickness range of 2.8–3.4 mm. The AO-induced surface layer introduces defect sites and disrupts local conductive pathways, reducing electrical conductivity from 0.23 to 0.22 S/m. This suppression of conduction loss improves impedance matching, while the preserved porous interior maintains strong attenuation capability. The synergy between the reconstructed surface and the internal porous framework leads to a smoother evolution of input impedance with varying thickness-key to achieving thickness-insensitive microwave absorption. The optimized coating further exhibits enhanced electromagnetic stability, including approximately 25% greater radar cross-section (<em>RCS</em>) reduction and expanded polarization-insensitive angular ranges by 10° in <em>TE</em> mode and 20° in <em>TM</em> mode.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"410 ","pages":"Article 140243"},"PeriodicalIF":2.7,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187175","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 : 2026-05-01Epub Date: 2026-02-06DOI: 10.1016/j.matlet.2026.140224
Qidong Liang , Junnan Wu , Haiyang Peng , Yinjie Liu , Rui He , Bin Zhu , Xiaodan Li , Leiying Zeng , Shuxin Zhuang
Olivine LiFe0.5Mn0.5PO₄ is a promising cathode material for lithium-ion batteries owing to its excellent structural stability and high operating voltage. However, its intrinsically low electronic conductivity and Mn dissolution severely limited its large-scale applications. Herein, an L-tartaric-acid-assisted carbon coating strategy is developed to fabricate carbon-coated LiFe0.5Mn0.5PO₄ by a facile rheological phase reaction method. Density functional theory calculations combined with electrochemical analyses reveal that the –COOH and –OH groups of L-tartaric acid would promote strong interfacial interactions with LiFe0.5Mn0.5PO₄ and facilitate the formation of a uniform and continuous carbon coating on the matrix, thereby accelerating charge-transfer and inhibiting Mn dissolution. As a result, the optimized LFMP-0.5 delivers a high specific capacity of 158.7 mAh/g at 0.1C and improved cycling stability, maintaining a capacity retention rate of 95.97% after 500 cycles at 1C. This work demonstrates an effective and scalable carbon coating strategy for improving olivine phosphate cathodes and provides new insights into the rational design of high-performance lithium-ion batteries.
{"title":"Stabilizing the cycling capability of LiFe0.5Mn0.5PO4 by carbon encapsulation for lithium-ion batteries","authors":"Qidong Liang , Junnan Wu , Haiyang Peng , Yinjie Liu , Rui He , Bin Zhu , Xiaodan Li , Leiying Zeng , Shuxin Zhuang","doi":"10.1016/j.matlet.2026.140224","DOIUrl":"10.1016/j.matlet.2026.140224","url":null,"abstract":"<div><div>Olivine LiFe<sub>0.5</sub>Mn<sub>0.5</sub>PO₄ is a promising cathode material for lithium-ion batteries owing to its excellent structural stability and high operating voltage. However, its intrinsically low electronic conductivity and Mn dissolution severely limited its large-scale applications. Herein, an <em>L</em>-tartaric-acid-assisted carbon coating strategy is developed to fabricate carbon-coated LiFe<sub>0.5</sub>Mn<sub>0.5</sub>PO₄ by a facile rheological phase reaction method. Density functional theory calculations combined with electrochemical analyses reveal that the –COOH and –OH groups of <em>L</em>-tartaric acid would promote strong interfacial interactions with LiFe<sub>0.5</sub>Mn<sub>0.5</sub>PO₄ and facilitate the formation of a uniform and continuous carbon coating on the matrix, thereby accelerating charge-transfer and inhibiting Mn dissolution. As a result, the optimized LFMP-0.5 delivers a high specific capacity of 158.7 mAh/g at 0.1C and improved cycling stability, maintaining a capacity retention rate of 95.97% after 500 cycles at 1C. This work demonstrates an effective and scalable carbon coating strategy for improving olivine phosphate cathodes and provides new insights into the rational design of high-performance lithium-ion batteries.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"410 ","pages":"Article 140224"},"PeriodicalIF":2.7,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146147222","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 : 2026-05-01Epub Date: 2026-02-09DOI: 10.1016/j.matlet.2026.140158
Yusuke Morimoto , Hiroya Abe , Yoshikazu Suzuki
We have prepared a novel “labyrinth-like” nickel‑cobalt oxide porous electrode using a short-time electrodeposition. Scanning electron microscopy revealed that 2-D sheets of nickel‑cobalt oxide were aggregated to form bimodal pores with a size distribution ranging from ∼10 nm to 10 μm on the substrate. The shape and size of the pores changed with the electrodeposition time. In particular, the pores in the 60 s electrodeposited sample transformed into a complex labyrinth-like structure. The sample exhibited a specific capacitance of 3670 F/g at 2 A/g and retained 79% of its capacitance after 750 cycles. This porous structure improved the electrochemical parameters.
我们利用短时间电沉积制备了一种新型的“迷宫状”镍钴氧化物多孔电极。扫描电镜显示，镍钴氧化物的二维薄片在衬底上聚集形成双峰孔，其尺寸分布在~ 10 nm ~ 10 μm之间。孔的形状和大小随电沉积时间的变化而变化。特别是60年代电沉积样品的孔隙转变成复杂的迷宫状结构。该样品在2 a /g时的比电容为3670 F/g，在750次循环后保持了79%的电容。这种多孔结构改善了电化学参数。
{"title":"Ultrahigh specific capacitance of 3670 F/g supercapacitor electrode achieved by nickel‑cobalt oxide with labyrinth-like porous structure","authors":"Yusuke Morimoto , Hiroya Abe , Yoshikazu Suzuki","doi":"10.1016/j.matlet.2026.140158","DOIUrl":"10.1016/j.matlet.2026.140158","url":null,"abstract":"<div><div>We have prepared a novel “labyrinth-like” nickel‑cobalt oxide porous electrode using a short-time electrodeposition. Scanning electron microscopy revealed that 2-D sheets of nickel‑cobalt oxide were aggregated to form bimodal pores with a size distribution ranging from ∼10 nm to 10 μm on the substrate. The shape and size of the pores changed with the electrodeposition time. In particular, the pores in the 60 s electrodeposited sample transformed into a complex labyrinth-like structure. The sample exhibited a specific capacitance of 3670 F/g at 2 A/g and retained 79% of its capacitance after 750 cycles. This porous structure improved the electrochemical parameters.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"410 ","pages":"Article 140158"},"PeriodicalIF":2.7,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187163","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 : 2026-05-01Epub Date: 2026-02-06DOI: 10.1016/j.matlet.2026.140225
Joonsoo Byeon, Ha Yeon Choi, Ju Yong Shin, Seung Ri Jeong, Shivam Kumar Gautam, Hi-Deok Lee
Two-dimensional transition metal dichalcogenide (TMDC) materials have unique structural and chemical properties, which makes them suitable for next-generation devices. However, high contact resistance between TMDCs and metal contacts limits the device performance. Metallic 1 T phase at the interface facilitates charge injection and reduce the contact resistance. This study reports on a low-frequency Ar/O2 plasma technique for achieving a uniform and clean 2H → 1 T phase transition in MoS2, confirmed through Raman, PL, TEM and XPS measurements. Furthermore, this study demonstrates that oxygen-based treatment can form MoO bonds and create a uniform surface, thereby passivating the defects present on the MoS2 surface, as analyzed by XPS and AFM. This research opens up new possibilities for phase transition techniques, suggesting that they can enhance the contact properties between MoS2 and metals, thereby improving device characteristics.
{"title":"Phase engineering of MoS2 via Ar/O2 plasma treatment","authors":"Joonsoo Byeon, Ha Yeon Choi, Ju Yong Shin, Seung Ri Jeong, Shivam Kumar Gautam, Hi-Deok Lee","doi":"10.1016/j.matlet.2026.140225","DOIUrl":"10.1016/j.matlet.2026.140225","url":null,"abstract":"<div><div>Two-dimensional transition metal dichalcogenide (TMDC) materials have unique structural and chemical properties, which makes them suitable for next-generation devices. However, high contact resistance between TMDCs and metal contacts limits the device performance. Metallic 1 T phase at the interface facilitates charge injection and reduce the contact resistance. This study reports on a low-frequency Ar/O<sub>2</sub> plasma technique for achieving a uniform and clean 2H → 1 T phase transition in MoS<sub>2</sub>, confirmed through Raman, PL, TEM and XPS measurements. Furthermore, this study demonstrates that oxygen-based treatment can form Mo<img>O bonds and create a uniform surface, thereby passivating the defects present on the MoS<sub>2</sub> surface, as analyzed by XPS and AFM. This research opens up new possibilities for phase transition techniques, suggesting that they can enhance the contact properties between MoS<sub>2</sub> and metals, thereby improving device characteristics.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"410 ","pages":"Article 140225"},"PeriodicalIF":2.7,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187164","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}
This study aimed to investigate the effect of pH on the green synthesis of silver nanoparticles using Blumea lacera (Bl) leaf extract and their anti-inflammatory properties. TEM analysis showed that the synthesized materials had a spherical shape and particle sizes began to decrease from 28 nm to 16 nm as the pH increased from 8.0 to 11.0. AgNPs synthesized at pH 11 exhibited higher anti-inflammatory activity (∼92% inhibition) when compared with synthesized AgNPs at pH 8.0–10.0 (86–47% inhibition). A proposed mechanism for AgNPs formation under alkaline medium was also presented.
{"title":"pH-driven biosynthesis of silver nanoparticles using Blumea lacera leaf extract with enhanced anti-inflammatory activity","authors":"Sumon Ganguli , Md Abid Hasan , Sabonty Bhattacharjee , Suman Barua , Nakshi Saha , Sabbir Howlader , Sreebash Chandra Bhattacharjee , Farhana Rumzum Bhuiyan , Samiran Bhattacharjee","doi":"10.1016/j.matlet.2026.140231","DOIUrl":"10.1016/j.matlet.2026.140231","url":null,"abstract":"<div><div>This study aimed to investigate the effect of pH on the green synthesis of silver nanoparticles using <em>Blumea lacera</em> (<em>Bl</em>) leaf extract and their anti-inflammatory properties. TEM analysis showed that the synthesized materials had a spherical shape and particle sizes began to decrease from 28 nm to 16 nm as the pH increased from 8.0 to 11.0. AgNPs synthesized at pH 11 exhibited higher anti-inflammatory activity (∼92% inhibition) when compared with synthesized AgNPs at pH 8.0–10.0 (86–47% inhibition). A proposed mechanism for AgNPs formation under alkaline medium was also presented.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"410 ","pages":"Article 140231"},"PeriodicalIF":2.7,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146147223","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 : 2026-05-01Epub Date: 2026-02-10DOI: 10.1016/j.matlet.2026.140199
Wen Shen , Rong Wang , Fen Ao , Jiaru Hu , Pi Yan , Junyao Zhang , Xuemei Ge
To address the challenges of permeability control and limited functionality in organ-on-a-chip biomembranes, this study developed a composite bionic membrane with an asymmetric wettability structure. The “hydrophobic-on-top, hydrophilic-below” configuration utilizes interfacial capillary forces as a built-in directional “micropump” to regulate substance transport effectively. Characterization confirmed the membrane's well-ordered topology, stable three-dimensional network, and intended wettability. Permeation experiments with β-nicotinamide mononucleotide (NMN) validated the capillary-driven transport mechanism. These results demonstrate the membrane's capability to enhance drug permeation efficiency and provide a new material platform for developing predictive, high-performance chip systems.
{"title":"Research on hydrophilic-hydrophobic composite membrane materials for functional blood-brain barrier permeability organ-on-a-chip systems","authors":"Wen Shen , Rong Wang , Fen Ao , Jiaru Hu , Pi Yan , Junyao Zhang , Xuemei Ge","doi":"10.1016/j.matlet.2026.140199","DOIUrl":"10.1016/j.matlet.2026.140199","url":null,"abstract":"<div><div>To address the challenges of permeability control and limited functionality in organ-on-a-chip biomembranes, this study developed a composite bionic membrane with an asymmetric wettability structure. The “hydrophobic-on-top, hydrophilic-below” configuration utilizes interfacial capillary forces as a built-in directional “micropump” to regulate substance transport effectively. Characterization confirmed the membrane's well-ordered topology, stable three-dimensional network, and intended wettability. Permeation experiments with β-nicotinamide mononucleotide (NMN) validated the capillary-driven transport mechanism. These results demonstrate the membrane's capability to enhance drug permeation efficiency and provide a new material platform for developing predictive, high-performance chip systems.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"410 ","pages":"Article 140199"},"PeriodicalIF":2.7,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187165","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 : 2026-05-01Epub Date: 2026-02-09DOI: 10.1016/j.matlet.2026.140236
K.N. Chethana , Nitesh S. Kanojiya , Reshmi T.Parayil , S. Sreevalsa , Subrata Das , Manish Kumar Mishra , Santosh K. Gupta
We report the design and fabrication of Bi3+ and Eu3+ co-doped Ca2Ga2GeO7 (CGGO) phosphors for high-performance warm-white light-emitting diodes (LEDs). The phosphor exhibits efficient Bi3+ → Eu3+ energy transfer, as evidenced by spectral overlap, enhanced Eu3+ emission, and quenching of Bi3+ emission with increasing Eu3+ content. The emission color shifts from blue to red with increasing Eu3+, achieving near-white emission at 3% Eu3+ (x = 0.33, y = 0.28) and a maximum energy transfer efficiency of 74% at 10% Eu3+. Incorporation into LEDs yields stable warm-white emission (CCT ∼2100 K) with good color rendering index and chromaticity, demonstrating suitability for high-temperature applications. These results establish CGGO:Bi3++Eu3+ phosphors as promising candidates for next-generation high-performance warm-white LEDs with tunable emission, excellent thermal stability, and practical applicability.
{"title":"Lanthanide-activated single-phosphor white light emission via Bi3+ → Eu3+ energy transfer in Ca₂Ga₂GeO₇ for next-generation LEDs","authors":"K.N. Chethana , Nitesh S. Kanojiya , Reshmi T.Parayil , S. Sreevalsa , Subrata Das , Manish Kumar Mishra , Santosh K. Gupta","doi":"10.1016/j.matlet.2026.140236","DOIUrl":"10.1016/j.matlet.2026.140236","url":null,"abstract":"<div><div>We report the design and fabrication of Bi<sup>3+</sup> and Eu<sup>3+</sup> co-doped Ca<sub>2</sub>Ga<sub>2</sub>GeO<sub>7</sub> (CGGO) phosphors for high-performance warm-white light-emitting diodes (LEDs). The phosphor exhibits efficient Bi<sup>3+</sup> → Eu<sup>3+</sup> energy transfer, as evidenced by spectral overlap, enhanced Eu<sup>3+</sup> emission, and quenching of Bi<sup>3+</sup> emission with increasing Eu<sup>3+</sup> content. The emission color shifts from blue to red with increasing Eu<sup>3+</sup>, achieving near-white emission at 3% Eu<sup>3+</sup> (x = 0.33, y = 0.28) and a maximum energy transfer efficiency of 74% at 10% Eu<sup>3+</sup>. Incorporation into LEDs yields stable warm-white emission (CCT ∼2100 K) with good color rendering index and chromaticity, demonstrating suitability for high-temperature applications. These results establish CGGO:Bi<sup>3+</sup>+Eu<sup>3+</sup> phosphors as promising candidates for next-generation high-performance warm-white LEDs with tunable emission, excellent thermal stability, and practical applicability.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"410 ","pages":"Article 140236"},"PeriodicalIF":2.7,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187166","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 : 2026-05-01Epub Date: 2026-02-10DOI: 10.1016/j.matlet.2026.140238
Yongxin Liu, Xiaowei Lei, Zhe Wang, Wenwen Wu, Nan Wang
A comparative investigation of the interdiffusion behavior between a NiCrAlYSi coating and two types of substrates was conducted at 1100 °C. The cross-sectional morphologies of the coated samples were characterized by scanning electron microscopy (SEM), and transmission electron microscopy (TEM) was employed for detailed phase analysis. The results reveal that elemental segregation in the laser-clad sample provides the concentration fluctuations necessary for the precipitation of TCP phases, while the diffusion of Cr accelerates the destabilization of the γ/γ' phase structure, leading to the formation of the interdiffusion zone (IDZ) and the secondary reaction zone (SRZ). This study provides valuable insights for optimizing the performance of laser-clad single-crystal superalloys in future applications.
{"title":"Interdiffusion behavior of NiCrAlYSi coatings in laser additive manufacturing and as-cast single-crystal superalloys","authors":"Yongxin Liu, Xiaowei Lei, Zhe Wang, Wenwen Wu, Nan Wang","doi":"10.1016/j.matlet.2026.140238","DOIUrl":"10.1016/j.matlet.2026.140238","url":null,"abstract":"<div><div>A comparative investigation of the interdiffusion behavior between a NiCrAlYSi coating and two types of substrates was conducted at 1100 °C. The cross-sectional morphologies of the coated samples were characterized by scanning electron microscopy (SEM), and transmission electron microscopy (TEM) was employed for detailed phase analysis. The results reveal that elemental segregation in the laser-clad sample provides the concentration fluctuations necessary for the precipitation of TCP phases, while the diffusion of Cr accelerates the destabilization of the γ/γ' phase structure, leading to the formation of the interdiffusion zone (IDZ) and the secondary reaction zone (SRZ). This study provides valuable insights for optimizing the performance of laser-clad single-crystal superalloys in future applications.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"410 ","pages":"Article 140238"},"PeriodicalIF":2.7,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187168","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 : 2026-05-01Epub Date: 2026-02-11DOI: 10.1016/j.matlet.2026.140248
Rebecca Sikkema , Igor Zhitomirsky
This investigation was motivated by the need in the development of electrophoretic deposition (EPD) for the fabrication of hyaluronic acid (HyH) films. EPD of HyH was performed from 5 g L−1 HyH solutions at 20 V during 5 min. The thickness of the film deposited from aqueous solutions was 80 μm, whereas the thickness of the film deposited from mixed water-ethanol solution was 214 μm. EPD offers benefits of fabricating thick, dense, and uniform films. Composite films were deposited by EPD from 5 g L−1 HyH solution in a 3:4 mixture of water: ethanol with 3 g L−1 ceramic nanoparticles. Composite films containing calcium phosphates, such as brushite and hydroxyapatite, TiO2, hollow halloysite nanotubes, and SiO2 in the HyH matrix were obtained. HyH promoted suspension stability acting as a dispersing and charging agent. For the first time hydroxyapatite and TiO2 were synthesized using triethylenetetramine (TH) as an organic alkali for synthesis. TH acted as an alkalizer-capping agent during synthesis and facilitated the formation of smaller fibrous hydroxyapatite particles, compared to particles prepared using NH4OH. The small hydroxyapatite particles were converted to brushite in HyH solutions and co-deposited with HyH, whereas larger hydroxyapatite particles showed improved chemical stability and were incorporated into HyH films by EPD. The strategies used for the synthesis of bioceramic nanoparticles using alkalizer-capping agent, fabrication of HyH and composite films open an avenue for the synthesis of other nanomaterials and deposition of other functional polymers and composites. The deposition mechanism was developed and discussed.
电泳沉积（EPD）技术是制备透明质酸（HyH）薄膜的必要技术。在5 g L−1的HyH溶液中，在20 V下进行5分钟的EPD。在水溶液中沉积的膜厚度为80 μm，而在水-乙醇混合溶液中沉积的膜厚度为214 μm。EPD提供制造厚，致密和均匀薄膜的好处。用EPD法将5 g L−1 HyH溶液与3 g L−1纳米陶瓷颗粒以3:4的比例混合，制备复合膜。在HyH基体中制备了含钙磷酸钙（如刷石和羟基磷灰石）、TiO2、空心高岭土纳米管和SiO2的复合膜。HyH作为分散和充电剂，提高了悬浮液的稳定性。首次以三乙烯四胺（TH）为有机碱合成了羟基磷灰石和TiO2。与使用NH4OH制备的颗粒相比，TH在合成过程中充当碱化封盖剂，有助于形成更小的纤维状羟基磷灰石颗粒。较小的羟基磷灰石颗粒在HyH溶液中转化为刷石并与HyH共沉积，而较大的羟基磷灰石颗粒表现出更好的化学稳定性，并通过EPD将其纳入HyH薄膜中。利用碱化封盖剂合成生物陶瓷纳米颗粒、制备HyH和复合膜的策略为合成其他纳米材料和沉积其他功能聚合物和复合材料开辟了一条途径。研究并讨论了沉积机理。
{"title":"Influence of triethylenetetramine on bioceramic synthesis and mechanisms of electrophoretic deposition of hyaluronic acid and composites","authors":"Rebecca Sikkema , Igor Zhitomirsky","doi":"10.1016/j.matlet.2026.140248","DOIUrl":"10.1016/j.matlet.2026.140248","url":null,"abstract":"<div><div>This investigation was motivated by the need in the development of electrophoretic deposition (EPD) for the fabrication of hyaluronic acid (HyH) films. EPD of HyH was performed from 5 g L<sup>−1</sup> HyH solutions at 20 V during 5 min. The thickness of the film deposited from aqueous solutions was 80 μm, whereas the thickness of the film deposited from mixed water-ethanol solution was 214 μm. EPD offers benefits of fabricating thick, dense, and uniform films. Composite films were deposited by EPD from 5 g L<sup>−1</sup> HyH solution in a 3:4 mixture of water: ethanol with 3 g L<sup>−1</sup> ceramic nanoparticles. Composite films containing calcium phosphates, such as brushite and hydroxyapatite, TiO<sub>2</sub>, hollow halloysite nanotubes, and SiO<sub>2</sub> in the HyH matrix were obtained. HyH promoted suspension stability acting as a dispersing and charging agent. For the first time hydroxyapatite and TiO<sub>2</sub> were synthesized using triethylenetetramine (TH) as an organic alkali for synthesis. TH acted as an alkalizer-capping agent during synthesis and facilitated the formation of smaller fibrous hydroxyapatite particles, compared to particles prepared using NH<sub>4</sub>OH. The small hydroxyapatite particles were converted to brushite in HyH solutions and co-deposited with HyH, whereas larger hydroxyapatite particles showed improved chemical stability and were incorporated into HyH films by EPD. The strategies used for the synthesis of bioceramic nanoparticles using alkalizer-capping agent, fabrication of HyH and composite films open an avenue for the synthesis of other nanomaterials and deposition of other functional polymers and composites. The deposition mechanism was developed and discussed.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"410 ","pages":"Article 140248"},"PeriodicalIF":2.7,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187169","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}
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