Open Ceramics最新文献_第5页

Preparation of ZnO@ZnS core-shell nanorod arrays with enhanced photocurrent for removal of methylene blue dyes in wastewater 增强光电流制备ZnO@ZnS核壳纳米棒阵列去除废水中的亚甲基蓝染料

IF 2.9

Open Ceramics Pub Date : 2025-02-18 DOI: 10.1016/j.oceram.2025.100756

Yu-Zhe Wu, Wenjea J. Tseng

{"title":"Preparation of ZnO@ZnS core-shell nanorod arrays with enhanced photocurrent for removal of methylene blue dyes in wastewater","authors":"Yu-Zhe Wu, Wenjea J. Tseng","doi":"10.1016/j.oceram.2025.100756","DOIUrl":"10.1016/j.oceram.2025.100756","url":null,"abstract":"<div><div>This study synthesized core-shell zinc oxide@zinc sulfide nanorod arrays (ZnO@ZnS NRAs) using a hydrothermal process in a thioacetamide solution, with sulfidation temperatures ranging from 60 to 100 °C. An increased sulfidation temperature resulted in a higher ZnS fraction within the ZnO@ZnS NRAs. ZnO@ZnS NRAs prepared at 70 °C, with a ZnS ratio of approximately 70:30 by weight, exhibited the highest photocurrent density of 0.22 mA·cm<sup>−2</sup> under xenon-lamp irradiation at a bias voltage of 1.5 V (vs. Ag/AgCl). X-ray photoelectron spectroscopy, photoluminescence, and electron paramagnetic resonance analyses confirmed the presence of vacancy defects, which are believed to promote the separation of photoinduced charge carriers, thereby enhancing carrier density. The increased photocurrent facilitated the efficient photodegradation of methylene blue dye in aqueous solutions, following Langmuir-Hinshelwood kinetics for heterogeneous catalysis. The first-order rate constant for the ZnO@ZnS NRAs treated at 70 °C was double that of the pristine ZnO counterpart. The band alignment at the ZnO-ZnS interface, combined with effective electron-hole separation, contributes to the enhanced photoelectrochemical and photocatalytic activity of the ZnO@ZnS NRAs.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"21 ","pages":"Article 100756"},"PeriodicalIF":2.9,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermomechanical and thermal characterization of pressureless sintered TiB2 无压烧结TiB2的热力学和热特性

IF 2.9

Open Ceramics Pub Date : 2025-02-18 DOI: 10.1016/j.oceram.2025.100754

Simone Taraborelli , Simone Failla , Diletta Sciti , Steven M. Smith II , Jeremy Watts , William G. Fahrenholtz , Greg E. Hilmas

{"title":"Thermomechanical and thermal characterization of pressureless sintered TiB2","authors":"Simone Taraborelli , Simone Failla , Diletta Sciti , Steven M. Smith II , Jeremy Watts , William G. Fahrenholtz , Greg E. Hilmas","doi":"10.1016/j.oceram.2025.100754","DOIUrl":"10.1016/j.oceram.2025.100754","url":null,"abstract":"<div><div>The impact of high-energy milling using WC<img>Co media on the pressureless sintering and properties of TiB<sub>2</sub> was studied. After 30 mins of milling, samples sintered at 2200 °C achieved a high relative density (>98 %) and a fine mean grain size (<2 µm). In the microstructure W<sub>x</sub>B<sub>y</sub> phases, often containing Co, were observed at triple points, due to contamination from the milling media. Moreover, core-rim structures with multiple rims were detected: the cores consisted of pure TiB<sub>2</sub> grains, the rims were (Ti<sub>x</sub>W<sub>y</sub>)B<sub>2</sub> solid solutions. The core-rim formation was significantly more pronounced compared to a reference sample of the same powder mixture densified by hot pressing at 1900 °C. The hardness reached 23 GPa, comparable to the hot-pressed sample, while the fracture toughness remained within 4.8–5.1 MPa·m<sup>1/2</sup> up to 1000 °C. The strength was approximately 350–400 MPa up to 1000 °C, declining sharply at higher temperatures due to W-containing impurities. Thermal diffusivity and conductivity were similarly impacted by these impurities.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"22 ","pages":"Article 100754"},"PeriodicalIF":2.9,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of Boron Carbide powder stability under accelerated aging 加速老化条件下碳化硼粉末稳定性的评价

IF 2.9

Open Ceramics Pub Date : 2025-02-17 DOI: 10.1016/j.oceram.2025.100755

Amruth Kaitheri , Johannes Ofstad , Elvia Anabela Chavez Panduro , Martin Oppegård , Sanosh Kunjalukkal Padmanabhan , Sudipto Pal , Antonio Alessandro Licciulli , Vidar Johannesen , Trygve Eidet , Kjell Wiik , Mari-Ann Einarsrud

{"title":"Evaluation of Boron Carbide powder stability under accelerated aging","authors":"Amruth Kaitheri , Johannes Ofstad , Elvia Anabela Chavez Panduro , Martin Oppegård , Sanosh Kunjalukkal Padmanabhan , Sudipto Pal , Antonio Alessandro Licciulli , Vidar Johannesen , Trygve Eidet , Kjell Wiik , Mari-Ann Einarsrud","doi":"10.1016/j.oceram.2025.100755","DOIUrl":"10.1016/j.oceram.2025.100755","url":null,"abstract":"<div><div>Boron carbide (B<sub>4</sub>C) is a hard and durable ceramic used in aerospace, nuclear reactors, ballistic protection, <em>etc</em>. The stability of B<sub>4</sub>C powders at ambient conditions has been investigated using accelerated ageing by heat treatment at 400 °C in controlled atmospheres. The degree of conversion of B<sub>4</sub>C increased in the following order: Argon (no reaction), humidified argon (∼4 %), synthetic air (∼13 %) and humidified synthetic air (∼19 %). In humidified atmosphere, the reaction product was boric acid due to cooling in the presence of humidity. The high conversion in humidified synthetic air suggests that humidity accelerates the oxidation, and a reaction mechanism is proposed to explain the enhanced rate of oxidation. It is anticipated that the observed oxidation reactions are not limited to 400 °C but will also occur at ambient temperatures. This agrees with observations of reduced quality of the B<sub>4</sub>C during storage in ambient atmosphere.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"22 ","pages":"Article 100755"},"PeriodicalIF":2.9,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improved mechanical quality of ceramic vat photopolymerization prints by supercritical carbon dioxide extraction 超临界二氧化碳萃取技术改善陶瓷缸光聚合印刷品的机械质量

IF 2.9

Open Ceramics Pub Date : 2025-02-15 DOI: 10.1016/j.oceram.2025.100753

Nonna Nurmi , Erkka J. Frankberg , Arnold Ismailov , Dominique Hautcoeur , Setareh Zakeri , Essi Sarlin , Erkki Levänen

{"title":"Improved mechanical quality of ceramic vat photopolymerization prints by supercritical carbon dioxide extraction","authors":"Nonna Nurmi , Erkka J. Frankberg , Arnold Ismailov , Dominique Hautcoeur , Setareh Zakeri , Essi Sarlin , Erkki Levänen","doi":"10.1016/j.oceram.2025.100753","DOIUrl":"10.1016/j.oceram.2025.100753","url":null,"abstract":"<div><div>Vat photopolymerization (VPP) enables 3D printing of dense ceramics with complex structures, however the mandatory thermal pre-conditioning and debinding steps to remove the organic substances, can last 7 days. Supercritical carbon dioxide (scCO<sub>2</sub>) extraction was used as a pre-conditioning method to investigate if dense and sufficiently strong alumina parts can be obtained using a shorter thermal debinding cycle, due to the creation of nanosized porosity during the scCO<sub>2</sub> extraction. The mechanical properties and microstructure of the sintered alumina parts with 15 h scCO<sub>2</sub> extraction + 18 h thermal debinding were comparable to the reference with 101 h debinding, which marks a significant 67 % reduction in time. Furthermore, scCO<sub>2</sub> extraction improved the flexural strength and density, and resulted in less deviation. Thus, scCO<sub>2</sub> extraction can shorten post-processing of ceramic VPP prints and facilitate more predictable properties, which have been the two bottlenecks related to the VPP process.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"21 ","pages":"Article 100753"},"PeriodicalIF":2.9,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Direct ink writing of IR-transparent yttria ceramics 红外透明氧化钇陶瓷的直墨书写

IF 2.9

Open Ceramics Pub Date : 2025-02-15 DOI: 10.1016/j.oceram.2025.100752

Dariia Chernomorets , Alex Sangiorgi , Jan Hostaša

引用次数: 0

Graphene oxide membranes coated on porous ceramic hollow fibers for the removal of pharmaceutical contaminants from wastewater 在多孔陶瓷中空纤维上涂覆氧化石墨烯膜用于去除废水中的药物污染物

IF 2.9

Open Ceramics Pub Date : 2025-02-14 DOI: 10.1016/j.oceram.2025.100750

Aline Maria de Jesus Machado Cardoso, Vicelma Luiz Cardoso, Miria Hespanhol Miranda Reis

引用次数: 0

The influence of the amount of recycled material on microstructure and properties of recycled single-domain YBCO bulks 再生材料用量对再生单畴YBCO块体微观结构和性能的影响

IF 2.9

Open Ceramics Pub Date : 2025-02-09 DOI: 10.1016/j.oceram.2025.100749

Jan Sklenka , Ondřej Jankovský , Tomáš Hlásek , Michal Lojka , David Sedmidubský , Filip Antončík

引用次数: 0

Highly complex ceramic cores for investment casting applications made possible by additive manufacturing 用于熔模铸造应用的高度复杂的陶瓷芯通过增材制造成为可能

IF 2.9

Open Ceramics Pub Date : 2025-02-09 DOI: 10.1016/j.oceram.2025.100748

Alice Rosa , Oscar Santoliquido , Francesco Camerota , Rose Ghaderi , Federico Barcelli , Alberto Ortona

引用次数: 0

Impact of bovine serum albumin in simulated body fluid on the dynamic dissolution behavior of bioactive glass S53P4 模拟体液中牛血清白蛋白对生物活性玻璃S53P4动态溶解行为的影响

IF 2.9

Open Ceramics Pub Date : 2025-02-07 DOI: 10.1016/j.oceram.2025.100747

Minna Siekkinen , Adrian Stiller , Xiaoju Wang , Leena Hupa

引用次数: 0

Effect of plasma process parameters on the wear behavior of High-Power Pulsed Magnetron Sputtering deposited Aluminum Titanium Nitride coatings 等离子体工艺参数对大功率脉冲磁控溅射沉积铝钛氮化涂层磨损性能的影响

IF 2.9

Open Ceramics Pub Date : 2025-01-28 DOI: 10.1016/j.oceram.2025.100746

Muhammad Naveed PhD , Awais Qadir PhD

{"title":"Effect of plasma process parameters on the wear behavior of High-Power Pulsed Magnetron Sputtering deposited Aluminum Titanium Nitride coatings","authors":"Muhammad Naveed PhD , Awais Qadir PhD","doi":"10.1016/j.oceram.2025.100746","DOIUrl":"10.1016/j.oceram.2025.100746","url":null,"abstract":"<div><div>High Power Pulsed Magnetron Sputtering (HPPMS) has emerged as a promising physical vapor deposition (PVD) technique for depositing hard coatings on cutting tools. Among these coatings, Aluminum Titanium Nitride (AlTiN) is widely recognized for its excellent mechanical and thermal properties, making it a popular choice for industrial cutting applications. Despite its growing adoption by coating solution providers, there remains a limited understanding of the influence of key HPPMS process parameters on the development of high-performance AlTiN coatings. This study investigates the effects of two critical process parameters—substrate bias and target frequency—on the deposition of AlTiN coatings. The wear behavior of the coated tools was assessed through turning tests, evaluating their performance under industrially relevant conditions. Additionally, the challenges of depositing coatings on tools with complex geometries were addressed. The findings provide valuable insights into the optimization of HPPMS process parameters, contributing to the development of advanced coatings with enhanced wear resistance and improved performance in cutting applications.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"21 ","pages":"Article 100746"},"PeriodicalIF":2.9,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0