Pub Date : 2024-07-10DOI: 10.1557/s43578-024-01388-4
Wenting Shen, Jiaxin Du, Xiangyu Mei, Su Liu, Fujian Liu, Yinsong Si
Graphitic carbon nitride (g-C3N4), owing to its unique structure, has emerged as a hotspot in the semiconductor photocatalytic hydrogen production. However, the intrinsic poor crystallinity of g-C3N4, which leads to poor hydrogen production efficiency, remains a significant drawback. This study introduces a novel approach for synthesizing highly crystallized g-C3N4 by optimizing precursor mass and employing a fixed temperature polymerization technique. Our research focuses on the intermediate stage polymerization at 220 °C using varying masses of dicyandiamide (DCY) precursors. The results indicate that an increase in the mass of the DCY precursor leads to g-C3N4 with a more regular microstructure and enhanced crystallinity. The photocatalytic hydrogen production rate of this g-C3N4 reached up to 3779 μmol·h−1·g−1, which is five times that of the original g-C3N4.This research holds significant implications for improving the photocatalytic hydrogen production performance of intrinsic g-C3N4.
{"title":"Fixed temperature polymerization during intermediate stage to synthesize highly crystallized g-C3N4 for photocatalytic hydrogen production","authors":"Wenting Shen, Jiaxin Du, Xiangyu Mei, Su Liu, Fujian Liu, Yinsong Si","doi":"10.1557/s43578-024-01388-4","DOIUrl":"https://doi.org/10.1557/s43578-024-01388-4","url":null,"abstract":"<p>Graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>), owing to its unique structure, has emerged as a hotspot in the semiconductor photocatalytic hydrogen production. However, the intrinsic poor crystallinity of g-C<sub>3</sub>N<sub>4</sub>, which leads to poor hydrogen production efficiency, remains a significant drawback. This study introduces a novel approach for synthesizing highly crystallized g-C<sub>3</sub>N<sub>4</sub> by optimizing precursor mass and employing a fixed temperature polymerization technique. Our research focuses on the intermediate stage polymerization at 220 °C using varying masses of dicyandiamide (DCY) precursors. The results indicate that an increase in the mass of the DCY precursor leads to g-C<sub>3</sub>N<sub>4</sub> with a more regular microstructure and enhanced crystallinity. The photocatalytic hydrogen production rate of this g-C<sub>3</sub>N<sub>4</sub> reached up to 3779 μmol·h<sup>−1</sup>·g<sup>−1</sup>, which is five times that of the original g-C<sub>3</sub>N<sub>4</sub>.This research holds significant implications for improving the photocatalytic hydrogen production performance of intrinsic g-C<sub>3</sub>N<sub>4</sub>.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"1 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141587688","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 paper describes a novel approach the development of biocompatible polyvinyl chloride (PVC) and polyurethane (PU) polymers, modified with copper (II) ions followed by the immobilisation the thrombin inhibitor argatroban (AG) using dopamine chemistry. The surface loading of the immobilised AG was 6.06 µg cm−2 on PVC and 6.66 µg cm−2 on PU, confirmed by FTIR and inhibitor concentration measurements. Both AG/Cu-modified polymers produced NO by catalytically decomposing S-nitrosothiol, reaching NO levels in plasma of 0.59 × 10–10(text{mol} , {text{cm}}^{-2} , {text{min}}^{-1}) for AG/Cu-PVC and 0.51 × 10–10(text{mol} , {text{cm}}^{-2} , {text{min}}^{-1}) for AG/Cu-PU, matching endothelial cell-produced physiological levels. This modification improved the haemocompatibility of the polymers through thrombin inhibition and reduced platelet aggregation and adhesion. Additionally, both modified polymers inhibited Staphylococcus aureus adhesion, growth and viability, confirming their acquired antibacterial properties. Antibacterial activity against Escherichia coli was also observed. These results demonstrate that modifying PVC and PU surfaces with copper (II) and AG produced materials with dual antithrombotic and antibacterial functions.
Graphical abstract
本文介绍了一种新方法，即开发生物相容性聚氯乙烯（PVC）和聚氨酯（PU）聚合物，用铜（II）离子修饰，然后用多巴胺化学法固定凝血酶抑制剂阿加曲班（AG）。经傅立叶变换红外光谱和抑制剂浓度测量证实，固定 AG 的表面负载量在 PVC 上为 6.06 µg cm-2，在 PU 上为 6.66 µg cm-2。两种 AG/Cu 改性聚合物都能通过催化分解 S-亚硝基硫醇产生 NO，血浆中的 NO 含量分别为：AG/Cu-PVC 0.59 × 10-10 （text{mol}，{text{cm}}^{-2} ，{text{min}}^{-1}），PU 0.51 × 10-10 （text{min}}^{-1}）。51 × 10-10 (text{mol} , {text{cm}}^{-2} , {text{min}}^{-1}) ，符合内皮细胞产生的生理水平。这种改性通过抑制凝血酶改善了聚合物的血液相容性，并降低了血小板的聚集和粘附。此外，这两种改性聚合物都能抑制金黄色葡萄球菌的粘附、生长和存活，证实了它们的抗菌特性。还观察到了对大肠杆菌的抗菌活性。这些结果表明，用铜（II）和 AG 对聚氯乙烯和聚氨酯表面进行改性，可制成具有抗血栓和抗菌双重功能的材料。
{"title":"Argatroban- and copper-modified polymers with improved thromboresistance and antimicrobial properties","authors":"Liana Azizova, Volodymyr Chernyshenko, Daria Korolova, Iain U. Allan, Sergey Mikhalovsky, Lyuba Mikhalovska","doi":"10.1557/s43578-024-01389-3","DOIUrl":"https://doi.org/10.1557/s43578-024-01389-3","url":null,"abstract":"<p>This paper describes a novel approach the development of biocompatible polyvinyl chloride (PVC) and polyurethane (PU) polymers, modified with copper (II) ions followed by the immobilisation the thrombin inhibitor argatroban (AG) using dopamine chemistry. The surface loading of the immobilised AG was 6.06 µg cm<sup>−2</sup> on PVC and 6.66 µg cm<sup>−2</sup> on PU, confirmed by FTIR and inhibitor concentration measurements. Both AG/Cu-modified polymers produced NO by catalytically decomposing S-nitrosothiol, reaching NO levels in plasma of 0.59 × 10<sup>–10</sup> <span>(text{mol} , {text{cm}}^{-2} , {text{min}}^{-1})</span> for AG/Cu-PVC and 0.51 × 10<sup>–10</sup> <span>(text{mol} , {text{cm}}^{-2} , {text{min}}^{-1})</span> for AG/Cu-PU, matching endothelial cell-produced physiological levels. This modification improved the haemocompatibility of the polymers through thrombin inhibition and reduced platelet aggregation and adhesion. Additionally, both modified polymers inhibited <i>Staphylococcus aureus</i> adhesion, growth and viability, confirming their acquired antibacterial properties. Antibacterial activity against <i>Escherichia coli</i> was also observed. These results demonstrate that modifying PVC and PU surfaces with copper (II) and AG produced materials with dual antithrombotic and antibacterial functions.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"23 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141569982","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 : 2024-07-09DOI: 10.1557/s43578-024-01380-y
Mohammad Raziul Haque, Md Masud Rana, Naznin Akhtar, Mohammad Shahedur Rahman, S. M. Asaduzzaman
Hydroxyapatite is widely used as a biomaterial filler to promote maxillofacial bone regeneration. Bacterial infections pose a common challenge to maxillofacial bone tissue regeneration; thus, incorporating antibacterial properties into hydroxyapatite-based scaffolds is essential. This study aimed to develop composite scaffolds for maxillofacial reconstruction by incorporating silver and iron nanoparticles into hydroxyapatite-polymer composites. A thermally induced phase separation method was employed to fabricate scaffolds with hydroxyapatite, collagen, and chitosan. Various characterization techniques, including porosity and density measurements, swelling ability analysis, biodegradability, FTIR, XRD, and SEM analysis, were utilized. The incorporation of silver and iron nanoparticles enhanced antibacterial properties and promoted bone growth. The scaffolds demonstrated efficacy against bacteria in antimicrobial assays. Cytotoxicity and blood biocompatibility analysis confirmed their compatibility with cells, and in vivo studies in a rabbit mandibular defect model demonstrated successful bone restoration. These findings may have significant implications for craniofacial tissue regeneration, particularly in non-load-bearing bone defects.
{"title":"Development of nanoparticle doped hydroxyapatite-based composite scaffolds for maxillofacial reconstruction","authors":"Mohammad Raziul Haque, Md Masud Rana, Naznin Akhtar, Mohammad Shahedur Rahman, S. M. Asaduzzaman","doi":"10.1557/s43578-024-01380-y","DOIUrl":"https://doi.org/10.1557/s43578-024-01380-y","url":null,"abstract":"<p>Hydroxyapatite is widely used as a biomaterial filler to promote maxillofacial bone regeneration. Bacterial infections pose a common challenge to maxillofacial bone tissue regeneration; thus, incorporating antibacterial properties into hydroxyapatite-based scaffolds is essential. This study aimed to develop composite scaffolds for maxillofacial reconstruction by incorporating silver and iron nanoparticles into hydroxyapatite-polymer composites. A thermally induced phase separation method was employed to fabricate scaffolds with hydroxyapatite, collagen, and chitosan. Various characterization techniques, including porosity and density measurements, swelling ability analysis, biodegradability, FTIR, XRD, and SEM analysis, were utilized. The incorporation of silver and iron nanoparticles enhanced antibacterial properties and promoted bone growth. The scaffolds demonstrated efficacy against bacteria in antimicrobial assays. Cytotoxicity and blood biocompatibility analysis confirmed their compatibility with cells, and in vivo studies in a rabbit mandibular defect model demonstrated successful bone restoration. These findings may have significant implications for craniofacial tissue regeneration, particularly in non-load-bearing bone defects.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"83 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141569986","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 : 2024-07-09DOI: 10.1557/s43578-024-01385-7
Zuzanna Buchwald, Tomasz Buchwald, Adam Voelkel
Hydroxyapatite modified with methacrylate groups-bearing polyhedral oligomeric silsesquioxane was for the first time applied as a filler in the experimental composite for dental applications. As the modifier changed the hydroxyapatite surface from hydrophilic to hydrophobic, it was predicted that the stability of the obtained composites would be improved in comparison with raw hydroxyapatite-filled composites. The stability in the oral imitating environment, basic physicochemical properties, and remineralizing potential understood as the ability to release calcium ions, were examined. The distribution of the fillers in the organic matrix, composites’ degree of conversion, depth of cure, flexural and compressive strengths, sorption, and solubility after 2 and 12 weeks of incubation, and the concentrations of calcium released were examined. The results were subjected to statistical analysis. The filler modification resulted in the improvement of the composites’ mass stability during long-term incubation with simultaneous beneficial more balanced calcium release profiles and comparable physicochemical properties.
{"title":"Hydroxyapatite modified with polyhedral oligomeric silsesquioxane as a filler for dental resin-based composites","authors":"Zuzanna Buchwald, Tomasz Buchwald, Adam Voelkel","doi":"10.1557/s43578-024-01385-7","DOIUrl":"https://doi.org/10.1557/s43578-024-01385-7","url":null,"abstract":"<p>Hydroxyapatite modified with methacrylate groups-bearing polyhedral oligomeric silsesquioxane was for the first time applied as a filler in the experimental composite for dental applications. As the modifier changed the hydroxyapatite surface from hydrophilic to hydrophobic, it was predicted that the stability of the obtained composites would be improved in comparison with raw hydroxyapatite-filled composites. The stability in the oral imitating environment, basic physicochemical properties, and remineralizing potential understood as the ability to release calcium ions, were examined. The distribution of the fillers in the organic matrix, composites’ degree of conversion, depth of cure, flexural and compressive strengths, sorption, and solubility after 2 and 12 weeks of incubation, and the concentrations of calcium released were examined. The results were subjected to statistical analysis. The filler modification resulted in the improvement of the composites’ mass stability during long-term incubation with simultaneous beneficial more balanced calcium release profiles and comparable physicochemical properties.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"43 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141569985","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}
Deep drawing of box-shaped products is of wide interest. In this study, sand was used as a flexible medium to replace the rigid die for deep drawing of box-shaped products. This method can enable forming with reduced die cost. During the deep drawing, three driving modes were realized through different placement of the sand. To study the difference among these three driving modes, the macroscopic and microscopic cooperative verification method was adopted. At the macroscopic level, the pressure stress was analyzed by using analytical models and simulation. The stress variation rules were also obtained. At the microscopic level, the microstructure of the key regions is discussed. The results show that the maximum decrease in the average grain size was about 82.38%. The maximum proportion of deformed grains was about 4.30%. The rules governing the change in the microstructure and stress were obtained, enabling prediction of the stress distribution and the microstructure of other products obtained by using sand forming.
{"title":"Analysis and simulation research on deep drawing of magnesium alloy box-shaped products with sand die based on different driving modes","authors":"Xinyu Han, Hongyu Wang, Xinyu Wang, Jinyan Han, Sixiang Zhang","doi":"10.1557/s43578-024-01373-x","DOIUrl":"https://doi.org/10.1557/s43578-024-01373-x","url":null,"abstract":"<p>Deep drawing of box-shaped products is of wide interest. In this study, sand was used as a flexible medium to replace the rigid die for deep drawing of box-shaped products. This method can enable forming with reduced die cost. During the deep drawing, three driving modes were realized through different placement of the sand. To study the difference among these three driving modes, the macroscopic and microscopic cooperative verification method was adopted. At the macroscopic level, the pressure stress was analyzed by using analytical models and simulation. The stress variation rules were also obtained. At the microscopic level, the microstructure of the key regions is discussed. The results show that the maximum decrease in the average grain size was about 82.38%. The maximum proportion of deformed grains was about 4.30%. The rules governing the change in the microstructure and stress were obtained, enabling prediction of the stress distribution and the microstructure of other products obtained by using sand forming.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"20 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141569984","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 : 2024-07-09DOI: 10.1557/s43578-024-01383-9
Huiying Hao, Dan Li
Hydrogel dressings with self-healing properties hold immense promise for enhancing the effectiveness of burn wound healing treatments by prolonging the lifespan of the material. In this study, a composite hydrogel combining hyaluronic acid (HA) and konjac glucomannan (KGM), referred to as HAKGM hydrogel, was synthesized using the Schiff-base reaction. The research focused on investigating the impact of varying KGM concentrations on key properties such as gelation time, swelling ratio, biodegradation, mechanical characteristics, and physico-chemical properties of the HAKGM hydrogel composite. Notably, the HAKGM hydrogel composite exhibited notable antibacterial and biofilm activities against tested microorganisms, underscoring its potential for infection control in burn wound management. Furthermore, cytotoxicity assessments on NIH/3T3 cells revealed minimal harm caused by the HAKGM hydrogel composite, suggesting its biocompatibility. Fluorescence imaging showcased the attachment and infiltration of fibroblasts into the hydrogel matrix over 24, 48, and 72 h of cell growth, indicating its ability to support cellular proliferation and tissue regeneration. Finally, in a full-thickness skin defect model, the injectable HAKGM hydrogel composite demonstrated significant efficacy in reducing burn wound recovery time. These findings highlight the potential utility of the novel HAKGM hydrogel composite as an advanced solution for burn wound dressings, offering enhanced healing properties and facilitating improved patient outcomes.
{"title":"Facile fabrication of functional hyaluronic acid-/konjac glucomannan-based injectable hydrogel as wound closure and anti-microbial material for the treatment of burn wound healing","authors":"Huiying Hao, Dan Li","doi":"10.1557/s43578-024-01383-9","DOIUrl":"https://doi.org/10.1557/s43578-024-01383-9","url":null,"abstract":"<p>Hydrogel dressings with self-healing properties hold immense promise for enhancing the effectiveness of burn wound healing treatments by prolonging the lifespan of the material. In this study, a composite hydrogel combining hyaluronic acid (HA) and konjac glucomannan (KGM), referred to as HAKGM hydrogel, was synthesized using the Schiff-base reaction. The research focused on investigating the impact of varying KGM concentrations on key properties such as gelation time, swelling ratio, biodegradation, mechanical characteristics, and physico-chemical properties of the HAKGM hydrogel composite. Notably, the HAKGM hydrogel composite exhibited notable antibacterial and biofilm activities against tested microorganisms, underscoring its potential for infection control in burn wound management. Furthermore, cytotoxicity assessments on NIH/3T3 cells revealed minimal harm caused by the HAKGM hydrogel composite, suggesting its biocompatibility. Fluorescence imaging showcased the attachment and infiltration of fibroblasts into the hydrogel matrix over 24, 48, and 72 h of cell growth, indicating its ability to support cellular proliferation and tissue regeneration. Finally, in a full-thickness skin defect model, the injectable HAKGM hydrogel composite demonstrated significant efficacy in reducing burn wound recovery time. These findings highlight the potential utility of the novel HAKGM hydrogel composite as an advanced solution for burn wound dressings, offering enhanced healing properties and facilitating improved patient outcomes.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"23 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141569983","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 : 2024-07-09DOI: 10.1557/s43578-024-01387-5
Neslihan Erat Toprak, Abdulkadir Özer, Gamze Bozkurt
In this study, we investigate for the first time the catalytic activity of the Co/Co3O4–Cu2O–ZnO catalyst in hydrogen production from the hydrolysis of NaBH4. After the Co3O4–CuO–ZnO support material was synthesized by the chemical precipitation method, the impregnation method was used to dope Co on the support material. Morphological and structural analyses of the Co/Co3O4–Cu2O–ZnO catalyst were investigated by XRD, XPS, SEM, TEM, and BET methods. Then, activity tests of the catalyst were performed in an H2 generation system. The hydrogen generation rate (HGR) of the Co/Co3O4–Cu2O–ZnO catalyst was found 4698 ml min−1 gcat−1 at 25°C. After the HGR measurements at 25, 35, 45, and 55°C the activation energy of the Co/Co3O4–Cu2O–ZnO catalyst was calculated as 28.05 kJ mol−1. In addition, the HGR value had reached a high value such as 12,920 ml min−1 gcat−1 at 55°C.
{"title":"Efficient hydrogen production via hydrolysis of NaBH4 by the Co/Co3O4–Cu2O–ZnO catalyst prepared using mixed metal oxides as support material","authors":"Neslihan Erat Toprak, Abdulkadir Özer, Gamze Bozkurt","doi":"10.1557/s43578-024-01387-5","DOIUrl":"https://doi.org/10.1557/s43578-024-01387-5","url":null,"abstract":"<p>In this study, we investigate for the first time the catalytic activity of the Co/Co<sub>3</sub>O<sub>4</sub>–Cu<sub>2</sub>O–ZnO catalyst in hydrogen production from the hydrolysis of NaBH<sub>4</sub>. After the Co<sub>3</sub>O<sub>4</sub>–CuO–ZnO support material was synthesized by the chemical precipitation method, the impregnation method was used to dope Co on the support material. Morphological and structural analyses of the Co/Co<sub>3</sub>O<sub>4</sub>–Cu<sub>2</sub>O–ZnO catalyst were investigated by XRD, XPS, SEM, TEM, and BET methods. Then, activity tests of the catalyst were performed in an H<sub>2</sub> generation system. The hydrogen generation rate (HGR) of the Co/Co<sub>3</sub>O<sub>4</sub>–Cu<sub>2</sub>O–ZnO catalyst was found 4698 ml min<sup>−1</sup> gcat<sup>−1</sup> at 25°C. After the HGR measurements at 25, 35, 45, and 55°C the activation energy of the Co/Co<sub>3</sub>O<sub>4</sub>–Cu<sub>2</sub>O–ZnO catalyst was calculated as 28.05 kJ mol<sup>−1</sup>. In addition, the HGR value had reached a high value such as 12,920 ml min<sup>−1</sup> gcat<sup>−1</sup> at 55°C.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"25 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141569987","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}
The study examines 3D printing technology for robust and flexible prototypes, concentrating on FDM to improve the tensile properties of multilayer TPU and conductive TPU. This research aims at the mechanical properties of layered materials to evaluate how effectively rapid prototyping approaches adhere to robust and soft components. The research evaluated five TPU/E-TPU filaments that additively produced multilayer assemblies: Models (TET), (ETE), (TETE/ETET), (pure TPU), and (pure E-TPU). Models of pure TPU and pure E-TPU serve as standards for comparison. We tailored three input parameters at three levels each: layer thickness, printing speed, and extruder temperature. The experimental results of TET (emphasizing flexibility) and ETE (prioritizing electric conductivity)-layered model arrangements lead to the best mechanical properties. The ANOVA results for the tensile strength extension response models; R2 = 75.7%; adjusted R2 = 69.3%; and the tensile strain at yield is R2 = 71.4%; adjusted R2 = 65.7%.
{"title":"Superior tensile properties of FDM 3D-printed TPU/E-TPU layered structure","authors":"Muhammad Imran Farid, Wenzheng Wu, Guiwei Li, Aodu Zheng, Yu Zhao","doi":"10.1557/s43578-024-01365-x","DOIUrl":"https://doi.org/10.1557/s43578-024-01365-x","url":null,"abstract":"<p>The study examines 3D printing technology for robust and flexible prototypes, concentrating on FDM to improve the tensile properties of multilayer TPU and conductive TPU. This research aims at the mechanical properties of layered materials to evaluate how effectively rapid prototyping approaches adhere to robust and soft components. The research evaluated five TPU/E-TPU filaments that additively produced multilayer assemblies: Models (TET), (ETE), (TETE/ETET), (pure TPU), and (pure E-TPU). Models of pure TPU and pure E-TPU serve as standards for comparison. We tailored three input parameters at three levels each: layer thickness, printing speed, and extruder temperature. The experimental results of TET (emphasizing flexibility) and ETE (prioritizing electric conductivity)-layered model arrangements lead to the best mechanical properties. The ANOVA results for the tensile strength extension response models; <i>R</i><sup>2</sup> = 75.7%; adjusted <i>R</i><sup>2</sup> = 69.3%; and the tensile strain at yield is <i>R</i><sup>2</sup> = 71.4%; adjusted <i>R</i><sup>2</sup> = 65.7%.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"1 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141552517","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 : 2024-07-02DOI: 10.1557/s43578-024-01382-w
V. Madhu Babu, Deekshith G. Kalali, Harita Seekala, P. Sudharshan Phani, K. Bhanu Sankara Rao, Koteswararao V. Rajulapati
Nanocrystalline two-phase AlCrFeMoNbNi high-entropy alloy (HEA) was produced using mechanical alloying (MA) and high-pressure torsion (HPT), with an average grain size of 10 ± 2 nm. Nanoindentation testing was performed to measure the hardness from which the strengthening contributions via various mechanisms such as strain hardening, solid solution strengthening, frictional stress and grain boundary strengthening are assessed. A Hall–Petch coefficient of 0.135 MPa (sqrt{text{m}}) is estimated from this analysis, which is much lower than that for comparable alloys. A very low activation volume, for plastic deformation, of 3.4 b3 was measured from strain rate dependent nanoindentation testing, which is indicative of grain boundary mediated plastic deformation. Furthermore, the estimated activation energy of 171 kJ/mol measured from nanoindentation testing, is comparable to that for grain boundary diffusion in Cantor alloy. These experimental results provide insights on the deformation response of nanocrystalline two-phase AlCrFeMoNbNi HEA at an extremely fine grain size of around 10 nm.
{"title":"Understanding the mechanical properties of two-phase nanocrystalline AlCrFeMoNbNi high-entropy alloy evaluated by nanoindentation","authors":"V. Madhu Babu, Deekshith G. Kalali, Harita Seekala, P. Sudharshan Phani, K. Bhanu Sankara Rao, Koteswararao V. Rajulapati","doi":"10.1557/s43578-024-01382-w","DOIUrl":"https://doi.org/10.1557/s43578-024-01382-w","url":null,"abstract":"<p>Nanocrystalline two-phase AlCrFeMoNbNi high-entropy alloy (HEA) was produced using mechanical alloying (MA) and high-pressure torsion (HPT), with an average grain size of 10 ± 2 nm. Nanoindentation testing was performed to measure the hardness from which the strengthening contributions via various mechanisms such as strain hardening, solid solution strengthening, frictional stress and grain boundary strengthening are assessed. A Hall–Petch coefficient of 0.135 MPa <span>(sqrt{text{m}})</span> is estimated from this analysis, which is much lower than that for comparable alloys. A very low activation volume, for plastic deformation, of 3.4 b<sup>3</sup> was measured from strain rate dependent nanoindentation testing, which is indicative of grain boundary mediated plastic deformation. Furthermore, the estimated activation energy of 171 kJ/mol measured from nanoindentation testing, is comparable to that for grain boundary diffusion in Cantor alloy. These experimental results provide insights on the deformation response of nanocrystalline two-phase AlCrFeMoNbNi HEA at an extremely fine grain size of around 10 nm.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"61 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141512259","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 : 2024-07-02DOI: 10.1557/s43578-024-01384-8
Muhammad Ilham Maulana, Adi Noer Syahid, Bunga Rani Elvira, Aprilia Erryani, Yudi Nugraha Thaha, Fendy Rokhmanto, Manami Mori, Kenta Yamanaka, Akhmad Ardian Korda, Ika Kartika, Albertus Deny Heri Setyawan
Co–Cr–W–Ni–Mn–B alloys, potentially applicable for implant materials, with boron contents of 0, 0.01, and 0.05 wt% were prepared by arc melting in an argon atmosphere. The influence of B content on the as-cast microstructure, mechanical, and corrosion properties was investigated. The as-cast state revealed dendritic structure, with the length of dendritic arm-spacing decreasing with increasing boron contents. The addition of boron led to the emergence of M5B3-type precipitates at the interdendritic boundaries within the matrix, which consisted of the γ and ε phases. The alloy with 0.01 wt% B exhibited increased ultimate-tensile-strength and plastic elongation of 17% and 36% higher than those of the boron-free alloy, respectively. The corrosion rate of the Co–Cr–W–Ni–Mn alloy in Hanks’ solution has dropped drastically by 850% with a minor B addition of 0.05 wt%. The improved mechanical and corrosion properties were attributed to the refined dendritic structure and formation of boride (M5B3-type) precipitates.
{"title":"Effect of boron microalloying on the microstructure, mechanical, and corrosion properties of as-cast biomedical Co–Cr–W–Ni-based alloys","authors":"Muhammad Ilham Maulana, Adi Noer Syahid, Bunga Rani Elvira, Aprilia Erryani, Yudi Nugraha Thaha, Fendy Rokhmanto, Manami Mori, Kenta Yamanaka, Akhmad Ardian Korda, Ika Kartika, Albertus Deny Heri Setyawan","doi":"10.1557/s43578-024-01384-8","DOIUrl":"https://doi.org/10.1557/s43578-024-01384-8","url":null,"abstract":"<p>Co–Cr–W–Ni–Mn–B alloys, potentially applicable for implant materials, with boron contents of 0, 0.01, and 0.05 wt% were prepared by arc melting in an argon atmosphere. The influence of B content on the as-cast microstructure, mechanical, and corrosion properties was investigated. The as-cast state revealed dendritic structure, with the length of dendritic arm-spacing decreasing with increasing boron contents. The addition of boron led to the emergence of M<sub>5</sub>B<sub>3</sub>-type precipitates at the interdendritic boundaries within the matrix, which consisted of the γ and ε phases. The alloy with 0.01 wt% B exhibited increased ultimate-tensile-strength and plastic elongation of 17% and 36% higher than those of the boron-free alloy, respectively. The corrosion rate of the Co–Cr–W–Ni–Mn alloy in Hanks’ solution has dropped drastically by 850% with a minor B addition of 0.05 wt%. The improved mechanical and corrosion properties were attributed to the refined dendritic structure and formation of boride (M<sub>5</sub>B<sub>3</sub>-type) precipitates.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"94 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141512260","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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