Pub Date : 2026-04-15Epub Date: 2026-02-03DOI: 10.1016/j.matlet.2026.140213
Yusei Kobayashi , Ikki Tateishi , Monir Uzzaman , Hideyuki Katsumata , Mai Furukawa , Satoshi Kaneco
A highly active photocatalyst was fabricated by directly growing a sulfone-functionalized covalent organic framework (TpTSN-COF) onto Cu-doped ZnIn2S4 (Cu-ZIS). This in-situ method ensured homogeneous COF deposition and strong interfacial coupling, promoting effective separation and migration of photogenerated electrons and holes. The optimized 5-COF@Cu-ZIS achieved a hydrogen evolution rate of 18,500 μmol g−1 h−1 and a 6.2% apparent quantum yield (AQY) at 500 nm, outperforming the individual components and their simple mixture. Mechanistic analysis indicates that an S-scheme junction facilitates directional charge flow and suppresses recombination. These results demonstrate that targeted COF integration on ZIS is an efficient strategy for solar-driven hydrogen production.
{"title":"Construction of sulfone-functionalized covalent organic framework@cu-ZnIn2S4 for enhanced photocatalytic hydrogen evolution under visible light irradiation","authors":"Yusei Kobayashi , Ikki Tateishi , Monir Uzzaman , Hideyuki Katsumata , Mai Furukawa , Satoshi Kaneco","doi":"10.1016/j.matlet.2026.140213","DOIUrl":"10.1016/j.matlet.2026.140213","url":null,"abstract":"<div><div>A highly active photocatalyst was fabricated by directly growing a sulfone-functionalized covalent organic framework (TpTSN-COF) onto Cu-doped ZnIn<sub>2</sub>S<sub>4</sub> (Cu-ZIS). This in-situ method ensured homogeneous COF deposition and strong interfacial coupling, promoting effective separation and migration of photogenerated electrons and holes. The optimized 5-COF@Cu-ZIS achieved a hydrogen evolution rate of 18,500 μmol g<sup>−1</sup> h<sup>−1</sup> and a 6.2% apparent quantum yield (AQY) at 500 nm, outperforming the individual components and their simple mixture. Mechanistic analysis indicates that an S-scheme junction facilitates directional charge flow and suppresses recombination. These results demonstrate that targeted COF integration on ZIS is an efficient strategy for solar-driven hydrogen production.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140213"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171506","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}
Adsorption abilities of heptazine-based graphitic carbon nitride nanosheets (hg–C3N4–NS) decorated with Rh, Ir, Pd, and Pt atoms, denoted by Rh-, Ir-, Pd-, and Pt-hg–C3N4–NSs, have been investigated using DFT method. The Pt–hg–C3N4–NS and Ir–hg–C3N4–NS obviously adsorb the first hydrogen molecule with very strong interaction energies of which adsorption energies are within the range of −2.42 eV to −2.85 eV. It was suggested that all the decorated nanosheets could have a high potential as hydrogenation catalysts and could be suggested as hydrogen storage materials but only the Rh–hg-C3N4–NS was suggested as the hydrogen sensing material.
{"title":"Effects of rh, Ir, pd, and Pt single atoms decorating on heptazine-based g-C3N4 nanosheets and their abilities on hydrogen molecule adsorption and sensing properties","authors":"Piyawat Amornthatri, Kanthira Kaewsud, Viwat Vchirawongkwin, Vithaya Ruangpornvisuti","doi":"10.1016/j.matlet.2026.140211","DOIUrl":"10.1016/j.matlet.2026.140211","url":null,"abstract":"<div><div>Adsorption abilities of heptazine-based graphitic carbon nitride nanosheets (hg–C<sub>3</sub>N<sub>4</sub>–NS) decorated with Rh, Ir, Pd, and Pt atoms, denoted by Rh-, Ir-, Pd-, and Pt-hg–C<sub>3</sub>N<sub>4</sub>–NSs, have been investigated using DFT method. The Pt–hg–C<sub>3</sub>N<sub>4</sub>–NS and Ir–hg–C<sub>3</sub>N<sub>4</sub>–NS obviously adsorb the first hydrogen molecule with very strong interaction energies of which adsorption energies are within the range of −2.42 eV to −2.85 eV. It was suggested that all the decorated nanosheets could have a high potential as hydrogenation catalysts and could be suggested as hydrogen storage materials but only the Rh–hg-C<sub>3</sub>N<sub>4</sub>–NS was suggested as the hydrogen sensing material.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140211"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171511","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 : 2026-04-15Epub Date: 2026-02-03DOI: 10.1016/j.matlet.2026.140207
Yue-Sheng Lin , Chaur-Jeng Wang , Yi-Ta Wang
This study investigates the influence of precursor stoichiometry on the structure and photocatalytic performance of hydrothermally synthesized ZnS. Systematic variation of the Zn/S molar ratio induces pronounced changes in crystal phase, defect chemistry, and optical behavior. Zn-rich compositions form ultrafine crystallites and exhibit strong UV-driven photocatalytic activity but negligible visible-light response. In contrast, S-rich compositions promote the formation of zinc vacancies, introducing defect states that extend visible-light absorption and markedly enhance photocatalytic efficiency. The Zn:S = 1:4 sample shows the highest activity, achieving 5.6- and 15.5-fold enhancements in visible-light degradation rates compared with the stoichiometric and Zn-rich samples, respectively, while maintaining good operational stability. Mechanistic analysis based on radical-trapping experiments and EPR confirms that superoxide radicals (•O2−) dominate the degradation pathway. These findings highlight precursor-ratio engineering as an effective strategy for optimizing wide-bandgap ZnS photocatalysts for environmental remediation.
{"title":"Precursor-ratio modulation for enhanced photocatalytic performance of hydrothermally synthesized ZnS photocatalysts","authors":"Yue-Sheng Lin , Chaur-Jeng Wang , Yi-Ta Wang","doi":"10.1016/j.matlet.2026.140207","DOIUrl":"10.1016/j.matlet.2026.140207","url":null,"abstract":"<div><div>This study investigates the influence of precursor stoichiometry on the structure and photocatalytic performance of hydrothermally synthesized ZnS. Systematic variation of the Zn/S molar ratio induces pronounced changes in crystal phase, defect chemistry, and optical behavior. Zn-rich compositions form ultrafine crystallites and exhibit strong UV-driven photocatalytic activity but negligible visible-light response. In contrast, S-rich compositions promote the formation of zinc vacancies, introducing defect states that extend visible-light absorption and markedly enhance photocatalytic efficiency. The Zn:S = 1:4 sample shows the highest activity, achieving 5.6- and 15.5-fold enhancements in visible-light degradation rates compared with the stoichiometric and Zn-rich samples, respectively, while maintaining good operational stability. Mechanistic analysis based on radical-trapping experiments and EPR confirms that superoxide radicals (•O<sub>2</sub><sup>−</sup>) dominate the degradation pathway. These findings highlight precursor-ratio engineering as an effective strategy for optimizing wide-bandgap ZnS photocatalysts for environmental remediation.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140207"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171494","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 : 2026-04-15Epub Date: 2026-02-07DOI: 10.1016/j.matlet.2026.140228
Ziqi Xu , Yuanbang Zhao , Ruoyu Wang , Haitao Ma , Yunpeng Wang , Hanying Wang
Copper-based materials are attractive for non-enzymatic glucose sensing due to their high activity and low cost. However, conventional powder-based electrodes often suffer from high interfacial resistance and limited active sites. Herein, we develop a facile strategy combining electrodeposition and anodization to directly fabricate self-supporting porous Cu₂O electrodes on copper foil. This binder-free electrode exhibits outstanding electrocatalytic performance, achieving a sensitivity of 946.19 μA·mM−1·cm−2 and a detection limit of 1.01 μM. Notably, it shows an exceptionally wide three-stage linear range (0.02–5.71 mM), covering physiological glucose levels in tears, saliva, interstitial fluid, and blood. The sensor also demonstrates excellent anti-interference ability and reproducibility, offering a promising approach for practical glucose detection.
{"title":"Self-supporting porous Cu₂O sensors with ultra-wide linear range for non-enzymatic glucose sensing","authors":"Ziqi Xu , Yuanbang Zhao , Ruoyu Wang , Haitao Ma , Yunpeng Wang , Hanying Wang","doi":"10.1016/j.matlet.2026.140228","DOIUrl":"10.1016/j.matlet.2026.140228","url":null,"abstract":"<div><div>Copper-based materials are attractive for non-enzymatic glucose sensing due to their high activity and low cost. However, conventional powder-based electrodes often suffer from high interfacial resistance and limited active sites. Herein, we develop a facile strategy combining electrodeposition and anodization to directly fabricate self-supporting porous Cu₂O electrodes on copper foil. This binder-free electrode exhibits outstanding electrocatalytic performance, achieving a sensitivity of 946.19 μA·mM<sup>−1</sup>·cm<sup>−2</sup> and a detection limit of 1.01 μM. Notably, it shows an exceptionally wide three-stage linear range (0.02–5.71 mM), covering physiological glucose levels in tears, saliva, interstitial fluid, and blood. The sensor also demonstrates excellent anti-interference ability and reproducibility, offering a promising approach for practical glucose detection.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140228"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171597","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 : 2026-04-15Epub Date: 2026-02-09DOI: 10.1016/j.matlet.2026.140220
A.A. Zisman, N.Y. Zolotorevsky
The crystal curvature derived from EBSD orientation data is widely employed to assess weighted Burgers vectors (WBV) and densities of geometrically necessary dislocations (GND) collected at strain-induced boundaries. At the same time, specific Burgers vectors of the constituent GND types remain uncertain. In this study, to simplify and eventually solve the problem, their potential directions are limited to crystal planes least deflected from the measured WBV. As shown on cold rolled copper, this approach leads to Burgers vectors corresponding to the most loaded slip systems.
{"title":"EBSD on dislocation boundaries in cold rolled copper to identify their constituent burgers vectors","authors":"A.A. Zisman, N.Y. Zolotorevsky","doi":"10.1016/j.matlet.2026.140220","DOIUrl":"10.1016/j.matlet.2026.140220","url":null,"abstract":"<div><div>The crystal curvature derived from EBSD orientation data is widely employed to assess weighted Burgers vectors (WBV) and densities of geometrically necessary dislocations (GND) collected at strain-induced boundaries. At the same time, specific Burgers vectors of the <em>constituent</em> GND types remain uncertain. In this study, to simplify and eventually solve the problem, their potential directions are limited to crystal planes least deflected from the measured WBV. As shown on cold rolled copper, this approach leads to Burgers vectors corresponding to the most loaded slip systems.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140220"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171582","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 : 2026-04-15Epub Date: 2026-01-30DOI: 10.1016/j.matlet.2026.140181
Nickolay Sdobnyakov , Andrei Kolosov , Kseniya Savina , Denis Sokolov , Roman E. Grigoryev , Egor S. Mitinev , Sergei Serov , Daria Kravchenko , Valentin Romanovski
A molecular dynamics simulation of the coalescence process of a multicomponent Al-Li-Cu-Zr nanoparticle with a Cu nanoparticle was performed using the LAMMPS software. The thermodynamic NVT ensemble and the Nose-Hoover thermostat were employed. The tight-binding potential was chosen as the interatomic interaction potential. Various stages of structure formation during coalescence were analyzed: (i) the stage of copper penetration in the multicomponent nanoparticle; (ii) formation of Cu@CuAlZr@Li core-shell and dendritic nanostructures; and (iii) destruction of the core-shell structure to form an alloy with non-uniform component distribution. The active process of displacement of copper atoms into the central part of the nanoparticle during the first stage of structure formation is caused by the difference in surface energies (primarily between copper and aluminum) of the components, while the difference in melting temperatures of the components causes the transition from the second to the third stage of structure formation. Also, the processes of structure formation are determined by the coefficients of mutual diffusion of the dominant components (in this case, Cu in Al) in the composition of the nanoalloy.
利用LAMMPS软件对多组分Al-Li-Cu-Zr纳米颗粒与Cu纳米颗粒的聚结过程进行了分子动力学模拟。采用了热力学NVT集合和Nose-Hoover恒温器。选择紧密结合势作为原子间相互作用势。分析了聚结过程中结构形成的各个阶段：(1)铜在多组分纳米颗粒中的渗透阶段；（ii） Cu@CuAlZr@Li核壳和枝晶纳米结构的形成；(3)破坏核壳结构，形成成分分布不均匀的合金。在结构形成的第一阶段，铜原子位移到纳米粒子中心部分的活跃过程是由组分表面能（主要是铜和铝之间）的差异引起的，而组分熔化温度的差异导致了结构形成的第二阶段到第三阶段的过渡。此外，结构形成过程由纳米合金成分中主要成分（在本例中为Cu in Al）的相互扩散系数决定。
{"title":"Coalescence behavior of Al-Li-Cu-Zr and Cu nanoparticles: structure formation under molecular dynamics simulation","authors":"Nickolay Sdobnyakov , Andrei Kolosov , Kseniya Savina , Denis Sokolov , Roman E. Grigoryev , Egor S. Mitinev , Sergei Serov , Daria Kravchenko , Valentin Romanovski","doi":"10.1016/j.matlet.2026.140181","DOIUrl":"10.1016/j.matlet.2026.140181","url":null,"abstract":"<div><div>A molecular dynamics simulation of the coalescence process of a multicomponent Al-Li-Cu-Zr nanoparticle with a Cu nanoparticle was performed using the LAMMPS software. The thermodynamic NVT ensemble and the Nose-Hoover thermostat were employed. The tight-binding potential was chosen as the interatomic interaction potential. Various stages of structure formation during coalescence were analyzed: (i) the stage of copper penetration in the multicomponent nanoparticle; (ii) formation of Cu@CuAlZr@Li core-shell and dendritic nanostructures; and (iii) destruction of the core-shell structure to form an alloy with non-uniform component distribution. The active process of displacement of copper atoms into the central part of the nanoparticle during the first stage of structure formation is caused by the difference in surface energies (primarily between copper and aluminum) of the components, while the difference in melting temperatures of the components causes the transition from the second to the third stage of structure formation. Also, the processes of structure formation are determined by the coefficients of mutual diffusion of the dominant components (in this case, Cu in Al) in the composition of the nanoalloy.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140181"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171369","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 : 2026-04-15Epub Date: 2026-01-29DOI: 10.1016/j.matlet.2026.140169
Mohammad Reza Ghorbani Fard , Anton N. Patarashvili , Anastasiia N. Patarashvili , Marina Yu. Aleshina , Vladislav O. Davydov , Alexey V. Katsaba , Alexey A. Efimov , Victor V. Ivanov
This paper presents a two-channel pulsed spark ablation method for the predictable and full-range fine-tuning of the elemental composition in Al–Zn bimetallic nanoparticles. The system was calibrated by investigating the mass yield in the region of extremely low discharge energies. For the targeted boundary compositions — Al-rich (80 wt% Al) and Zn-rich (2 wt% Al) — EDX analysis confirmed the predicted ratios with high accuracy, validating the precision of the control method. Comprehensive TEM, SAED, and EDX characterization revealed that the nanoparticles form branched, porous aggregates of intimately mixed Al and Zn nanoclusters (mean size 5 nm), constituting a homogeneous nanoscale mixture. This approach provides a direct and versatile route for the tailored design of complex bimetallic nanomaterials with controlled composition and enhanced interfacial area, promising for applications in catalysis and aerosol printing.
{"title":"Controlled synthesis of Al–Zn bimetallic nanoparticles by dual-channel spark ablation","authors":"Mohammad Reza Ghorbani Fard , Anton N. Patarashvili , Anastasiia N. Patarashvili , Marina Yu. Aleshina , Vladislav O. Davydov , Alexey V. Katsaba , Alexey A. Efimov , Victor V. Ivanov","doi":"10.1016/j.matlet.2026.140169","DOIUrl":"10.1016/j.matlet.2026.140169","url":null,"abstract":"<div><div>This paper presents a two-channel pulsed spark ablation method for the predictable and full-range fine-tuning of the elemental composition in Al–Zn bimetallic nanoparticles. The system was calibrated by investigating the mass yield in the region of extremely low discharge energies. For the targeted boundary compositions — Al-rich (<span><math><mi>≈</mi></math></span>80 wt% Al) and Zn-rich (<span><math><mi>≈</mi></math></span>2 wt% Al) — EDX analysis confirmed the predicted ratios with high accuracy, validating the precision of the control method. Comprehensive TEM, SAED, and EDX characterization revealed that the nanoparticles form branched, porous aggregates of intimately mixed Al and Zn nanoclusters (mean size <span><math><mo><</mo></math></span>5 nm), constituting a homogeneous nanoscale mixture. This approach provides a direct and versatile route for the tailored design of complex bimetallic nanomaterials with controlled composition and enhanced interfacial area, promising for applications in catalysis and aerosol printing.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140169"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076732","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}
Fracture mechanics analyses require accurate fracture energy characterization. In brittle materials, total fracture energy (GF) is difficult to measure due to unstable post-peak behavior, whereas initial fracture energy (Gf), governed by the peak load, can be determined reliably and provides a robust basis for estimating the total fracture energy. Accordingly, this study experimentally investigates the fracture behavior of self-compacting concrete (SCC) containing 1%, 2%, 3%, 4% and 5% nano-SiO2 contents using the size effect method. Six mix designs with a constant water-to-cement ratio of 0.35 were evaluated. The results demonstrate that nano-SiO2 addition increases the initial fracture energy (Gf) up to an optimal dosage, beyond which further incorporation results in a reduction. The maximum enhancement in initial fracture energy (Gf) observed in this study was 5.59%. Finally, the equation is proposed to estimate the Gf of nano-SiO2 modified SCC.
{"title":"Evaluating the influence of nano-SiO₂ on the fracture of self-compacting concrete using the size effect method","authors":"Gholamreza Kargariyan Marvasty, Moosa Mazloom, Seyed Hassan Ahmadi","doi":"10.1016/j.matlet.2026.140187","DOIUrl":"10.1016/j.matlet.2026.140187","url":null,"abstract":"<div><div>Fracture mechanics analyses require accurate fracture energy characterization. In brittle materials, total fracture energy (<em>G</em><sub><em>F</em></sub>) is difficult to measure due to unstable post-peak behavior, whereas initial fracture energy (<em>G</em><sub><em>f</em></sub>), governed by the peak load, can be determined reliably and provides a robust basis for estimating the total fracture energy. Accordingly, this study experimentally investigates the fracture behavior of self-compacting concrete (SCC) containing 1%, 2%, 3%, 4% and 5% nano-SiO<sub>2</sub> contents using the size effect method. Six mix designs with a constant water-to-cement ratio of 0.35 were evaluated. The results demonstrate that nano-SiO<sub>2</sub> addition increases the initial fracture energy (<em>G</em><sub><em>f</em></sub>) up to an optimal dosage, beyond which further incorporation results in a reduction. The maximum enhancement in initial fracture energy (<em>G</em><sub><em>f</em></sub>) observed in this study was 5.59%. Finally, the equation <span><math><msub><mi>G</mi><mi>f</mi></msub><mo>=</mo><mn>21.3148</mn><mspace></mspace><msup><mfenced><msub><mi>f</mi><mi>c</mi></msub></mfenced><mn>0.206071</mn></msup></math></span> is proposed to estimate the <em>G</em><sub><em>f</em></sub> of nano-SiO<sub>2</sub> modified SCC.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140187"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171377","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 : 2026-04-15Epub Date: 2026-02-02DOI: 10.1016/j.matlet.2026.140206
Lidia Zasada, Beata Kaczmarek-Szczepańska
This study developed and evaluated sodium alginate–pullulan (SA–PU) hydrogels modified with tannic acid (TA) as potential bioinks for extrusion-based 3D bioprinting. SA–PU and SA–PU/TA hydrogels were compared in terms of structural, mechanical, and physicochemical properties, with emphasis on printability and post-printing stability. TA-modified hydrogels exhibited lower moisture content, enhanced thermal stability, and significantly reduced molecular diffusion, indicating a denser network. The SA–PU/TA hydrogel shows potential for biomedical and pharmaceutical applications, particularly for 3D-printed scaffolds requiring controlled mass transport and structural stability.
{"title":"Bioprintable SA/PU hydrogels reinforced with tannic acid","authors":"Lidia Zasada, Beata Kaczmarek-Szczepańska","doi":"10.1016/j.matlet.2026.140206","DOIUrl":"10.1016/j.matlet.2026.140206","url":null,"abstract":"<div><div>This study developed and evaluated sodium alginate–pullulan (SA–PU) hydrogels modified with tannic acid (TA) as potential bioinks for extrusion-based 3D bioprinting. SA–PU and SA–PU/TA hydrogels were compared in terms of structural, mechanical, and physicochemical properties, with emphasis on printability and post-printing stability. TA-modified hydrogels exhibited lower moisture content, enhanced thermal stability, and significantly reduced molecular diffusion, indicating a denser network. The SA–PU/TA hydrogel shows potential for biomedical and pharmaceutical applications, particularly for 3D-printed scaffolds requiring controlled mass transport and structural stability.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140206"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171389","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 : 2026-04-15Epub Date: 2026-02-04DOI: 10.1016/j.matlet.2026.140219
Honglin Yan , Hanyang Zuo , Chunguang Zhu , Tong Wu , Zhenghong Xu , Wenli Liu , Jiyuan Xiao , Yunbo Zhang , Jianhong Lu
An eco-friendly phytic acid (PA) conversion film was developed to enhance the marine durability of Ti-6Al-4 V titanium alloys (TC4) by improving galvanic corrosion resistance and organic coating adhesion. Optimal formation parameters were identified through orthogonal experiments. The film exhibited a dense, mud-cracked morphology (6 μm thick) with a composition of TiF₃ (6.7%), TiOF₂ (4.6%), TiO₂ (8.7%), TiF₄ (9.4%), AlF₃ (16.7%) and PA-Ti amorphous matrix (53.9%). The film-forming process was divided into three stages: dissolution of the substrate, growth of the film, and the dynamic equilibrium of the film growth/dissolution. After PA film treatment, the galvanic corrosion current density with coupled metals aluminum alloy (AA6061: 0.120 μA/cm2), brass (H59: 0.036 μA/cm2) and steel (Q235: 0.093 μA/cm2) was reduced by 1–2 orders of magnitude, and the organic coating adhesion increased by 99.54%. Following saltwater immersion, adhesion decreased by only 9.95%. This work provides a practical green pretreatment strategy for titanium alloys.
{"title":"Performance of an eco-friendly phytic acid conversion film on TC4 titanium alloy","authors":"Honglin Yan , Hanyang Zuo , Chunguang Zhu , Tong Wu , Zhenghong Xu , Wenli Liu , Jiyuan Xiao , Yunbo Zhang , Jianhong Lu","doi":"10.1016/j.matlet.2026.140219","DOIUrl":"10.1016/j.matlet.2026.140219","url":null,"abstract":"<div><div>An eco-friendly phytic acid (PA) conversion film was developed to enhance the marine durability of Ti-6Al-4 V titanium alloys (TC4) by improving galvanic corrosion resistance and organic coating adhesion. Optimal formation parameters were identified through orthogonal experiments. The film exhibited a dense, mud-cracked morphology (6 μm thick) with a composition of TiF₃ (6.7%), TiOF₂ (4.6%), TiO₂ (8.7%), TiF₄ (9.4%), AlF₃ (16.7%) and PA-Ti amorphous matrix (53.9%). The film-forming process was divided into three stages: dissolution of the substrate, growth of the film, and the dynamic equilibrium of the film growth/dissolution. After PA film treatment, the galvanic corrosion current density with coupled metals aluminum alloy (AA6061: 0.120 μA/cm<sup>2</sup>), brass (H59: 0.036 μA/cm<sup>2</sup>) and steel (Q235: 0.093 μA/cm<sup>2</sup>) was reduced by 1–2 orders of magnitude, and the organic coating adhesion increased by 99.54%. Following saltwater immersion, adhesion decreased by only 9.95%. This work provides a practical green pretreatment strategy for titanium alloys.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140219"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171507","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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