Discover Materials最新文献_第4页

Fabrication of flat stainless steel substrates with improved oxidation behavior for metal-supported solid oxide cells using aqueous tape casting 采用水带铸造技术制备具有改善氧化性能的金属支撑固体氧化物电池用平面不锈钢衬底

Discover Materials Pub Date : 2023-10-20 DOI: 10.1007/s43939-023-00063-5

Yifei Yan, Olivera Kesler

{"title":"Fabrication of flat stainless steel substrates with improved oxidation behavior for metal-supported solid oxide cells using aqueous tape casting","authors":"Yifei Yan, Olivera Kesler","doi":"10.1007/s43939-023-00063-5","DOIUrl":"https://doi.org/10.1007/s43939-023-00063-5","url":null,"abstract":"Abstract An aqueous tape casting procedure was developed and optimized to fabricate thick, flat tapes for use as porous stainless-steel substrates for metal-supported solid oxide cells (MS-SOCs). Curling tape is one of the main challenges when using aqueous based slurry formation. This work demonstrated that the sedimentation problem can be solved by increasing solid loading rather than adding excessive binder to raise viscosity. The effect of various casting surfaces on tape curling was also investigated. Materials that allow easy tape release resulted in flatter tapes once the water was evaporated. In addition, substrate oxidation resistance at high temperature was evaluated with respect to starting powder size, sintering extent, and pore former types. High sintering extent that removes or encloses the porosity between steel particles while retaining porosity left by pore formers can effectively prevent breakaway oxidation due to local chromium depletion. Carbon residue in the steel substrates from the slurry organic content can be decreased when formulating the slurry to prevent Cr-rich phase formation in the steel, which severely compromises the substrate oxidation resistance and ductility. By dwelling the substrate in high purity hydrogen, the sensitization can be reversed, but more detailed investigation of the reaction dynamics is needed. By combining the strategies described, this work produced crack-free, flat, 400–500 μm thick stainless steel substrates with 28.7 vol% porosity and improved oxidation resistance compared to previous substrates fabricated by dry pressing of fine powders.","PeriodicalId":34625,"journal":{"name":"Discover Materials","volume":"27 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135567528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis and characterization of CuO-MgO-ZnO and CuO-Co3O4-CeO2 CuO-MgO-ZnO和CuO-Co3O4-CeO2的合成与表征

Discover Materials Pub Date : 2023-09-26 DOI: 10.1007/s43939-023-00064-4

Leonardo Francisco Gonçalves Dias, Gabriel Junior Cavalcante Pimentel, João Pedro Costa Rheinheimer, Orisson Ponce Gomes, Bianca Gottardo de Almeida, Diogo Paschoalini Volanti, Margarete Teresa Gottardo de Almeida, Paulo Noronha Lisboa-Filho

{"title":"Synthesis and characterization of CuO-MgO-ZnO and CuO-Co3O4-CeO2","authors":"Leonardo Francisco Gonçalves Dias, Gabriel Junior Cavalcante Pimentel, João Pedro Costa Rheinheimer, Orisson Ponce Gomes, Bianca Gottardo de Almeida, Diogo Paschoalini Volanti, Margarete Teresa Gottardo de Almeida, Paulo Noronha Lisboa-Filho","doi":"10.1007/s43939-023-00064-4","DOIUrl":"https://doi.org/10.1007/s43939-023-00064-4","url":null,"abstract":"Abstract The synthesis of trioxides offers unique properties for different applications due to the combination of multiple oxides; however, few studies have reported on the properties of these materials, especially in terms of their ability to create reactive oxygen species, which are helpful for antibacterial and antifungal activity. This study aimed to evaluate the surface properties of CuO-MgO-ZnO and CuO-Co 3 O 4 -CeO 2 trioxides synthesized via precipitation assisted by an ultrasonic bath or sonication. The structural analysis indicated the formation of micrometric particles consisting of individual phases of each oxide, with no apparent influence of the preparation method on their morphology. UV–Vis spectroscopy revealed that CuO-MgO-ZnO particles have a band gap near 5.5 eV, while CuO-Co 3 O 4 -CeO 2 has a single value at 4.2 eV. Zeta potential measurements indicated changes in the materials' outermost layer composition due to the synthesis method. Additionally, biological assays showed that the materials could completely inhibit the growth of Candida species and Staphylococcus aureus but not Klebsiella pneumoniae . These results suggest that the materials may be suitable for self-cleaning surfaces and medical device coatings.","PeriodicalId":34625,"journal":{"name":"Discover Materials","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134886228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dielectric and energy harvesting properties of functionalized composite nanofibers consisting of Boc-Phe-Leu self-assembled dipeptide inclusions in biocompatible polymeric matrices 生物相容性聚合物基质中由boc - ph - leu自组装二肽包体组成的功能化复合纳米纤维的介电和能量收集性能

Discover Materials Pub Date : 2023-09-23 DOI: 10.1007/s43939-023-00062-6

Adelino Handa, Rosa M. F. Baptista, Daniela Santos, Bruna Silva, João Oliveira, Bernardo Almeida, Etelvina de Matos Gomes, Michael Belsley

{"title":"Dielectric and energy harvesting properties of functionalized composite nanofibers consisting of Boc-Phe-Leu self-assembled dipeptide inclusions in biocompatible polymeric matrices","authors":"Adelino Handa, Rosa M. F. Baptista, Daniela Santos, Bruna Silva, João Oliveira, Bernardo Almeida, Etelvina de Matos Gomes, Michael Belsley","doi":"10.1007/s43939-023-00062-6","DOIUrl":"https://doi.org/10.1007/s43939-023-00062-6","url":null,"abstract":"Abstract Hybrid bionanomaterials were produced through electrospinning, incorporating the dipeptide Boc- l -phenylalanyl- l -leucine into nanofibers of biocompatible polymers. Scanning electron microscopy confirmed the uniformity of the nanofibers, with diameters ranging from 0.56 to 1.61 µm. The dielectric properties of the nanofibers were characterized using impedance spectroscopy, assessing temperature and frequency dependencies. Notably, the composite micro/nanofibers exhibited semiconducting dielectric behavior with bandgap energies of 4–5 eV, and their analysis revealed increased dielectric constant with temperature due to enhanced charge mobility. The successful incorporation of the dipeptide was verified by Maxwell–Wagner interfacial polarization, and the Havriliak–Negami model disclosed insights into electric permittivity. Furthermore, the fibers demonstrated pyroelectric and piezoelectric responses, with Boc-Phe-Leu@PLLA nanofibers having the highest piezoelectric coefficient of 85 pC/N. These findings highlight the influence of dipeptide nanostructures on dielectric, pyroelectric, and piezoelectric properties, suggesting the potential of polymeric micro/nanofibers as efficient piezoelectric energy generators for portable and wearable devices. Graphical Abstract","PeriodicalId":34625,"journal":{"name":"Discover Materials","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135961141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Assessing the performance of MoTe2 based solar cell with Cu2O hole transport layer through device simulation 通过器件仿真评估具有Cu2O空穴传输层的MoTe2基太阳能电池的性能

Discover Materials Pub Date : 2023-09-13 DOI: 10.1007/s43939-023-00061-7

Naimur Rahman, Md. Dulal Haque, Md. Ferdous Rahman, Md. Mominul Islam, Most. Airin Nahar Juthi, Anita Rani Roy, Most. Alema Akter, Md. Foridul Islam

{"title":"Assessing the performance of MoTe2 based solar cell with Cu2O hole transport layer through device simulation","authors":"Naimur Rahman, Md. Dulal Haque, Md. Ferdous Rahman, Md. Mominul Islam, Most. Airin Nahar Juthi, Anita Rani Roy, Most. Alema Akter, Md. Foridul Islam","doi":"10.1007/s43939-023-00061-7","DOIUrl":"https://doi.org/10.1007/s43939-023-00061-7","url":null,"abstract":"Abstract In this study, the SCAPS-1D tool has been used to numerically examine the performance of Transition Metal Dichalcogenides (TMDC) based Molybdenum ditelluride (MoTe 2 ) solar cells containing CdS electron transport layer (ETL) and Cu 2 O hole transport layer (HTL). Based on the photovoltaic cell parameters, including absorber layer thickness, temperature, defect density, the effects of series and shunt resistance, and electron affinity, the structure of both MoTe 2 based solar cells with and without the usage of the HTL has been analyzed. With 1.1 μm thickness of MoTe 2 and doping density of 5 × 10 15 cm −3 , Al/FTO/CdS/MoTe 2 /Cu 2 O/Ni heterojunction’s solar cell proposed structure has been optimized. The final power conversion efficiency (PCE) = 32.38%, open-circuit voltage (V oc ) = 1.07 V, short-circuit current (J sc ) = 35.12 mA/cm 2 , and fill factor (FF) = 86.32% has been determined from the optimized structure. The determined results indicate a suitable path for the realization of low cost and high efficiency MoTe 2 -based solar cell.","PeriodicalId":34625,"journal":{"name":"Discover Materials","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135740305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Polyethylene terephthalate aggregates in structural lightweight concrete: a meta-analysis and review 聚对苯二甲酸乙二醇酯骨料在结构轻量化混凝土:荟萃分析和回顾

Discover Materials Pub Date : 2023-09-08 DOI: 10.1007/s43939-023-00060-8

Chikadibia K.A Uche, Sani Aliyu Abubakar, S. N. Nnamchi, K. Ukagwu

引用次数: 0

The differences in crystal structure and phase of lead-free perovskite solar cell materials 无铅钙钛矿太阳能电池材料的晶体结构和物相差异

Discover Materials Pub Date : 2023-08-22 DOI: 10.1007/s43939-023-00055-5

S. Pering

引用次数: 1

Thermal DLTS study of the defect states of PELLE polymer 微球聚合物缺陷态的热DLTS研究

Discover Materials Pub Date : 2023-08-07 DOI: 10.1007/s43939-023-00059-1

J. Rusnák, Michal Pecz, Ján Škoviera, Ivan Klbik