세라미스트最新文献

{"title":"Recent progresses in metal oxide gas sensors for food freshness monitoring","authors":"Young Kook Moon","doi":"10.31613/ceramist.2023.26.3.05","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.3.05","url":null,"abstract":"As the growing demand for fresh and safe food continues, the development of reliable, low-cost, and time-saving methods for freshness investigation becomes increasingly important. Metal oxide gas sensors, which offer distinctive advantages such as high gas response, reversible reaction, and cost-effectiveness, represent valuable tools for monitoring food freshness to avoid rotten meat, spoiled fish, and over-ripened fruit. This paper reviews the recent developments in metal oxide gas sensors for highly sensitive and selective detection of food freshness marker gases, such as hydrogen sulfide, ammonia, trimethylamine, and ethylene. Key approaches include the use of thermal activation, the utilization of chemical affinity between analyte gases and sensing materials, and bilayer structures with catalytic overlayers. Overall, the development of such advanced gas sensors has the potential to greatly improve the efficiency and accuracy of food freshness monitoring, making it more accessible and convenient for food producers and consumers.","PeriodicalId":495698,"journal":{"name":"세라미스트","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135085925","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}

{"title":"Improvement of mechanical properties of hard metals for cutting tools","authors":"Hanjung Kwon","doi":"10.31613/ceramist.2023.26.3.04","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.3.04","url":null,"abstract":"The cutting tools used to machine metallic ingots are produced using hard metals with excellent wear resistance. These hard metals consist of hard phases (transitional metal carbides) and tough phases (metallic phases), though microstructural variables such as grain size, mean free path, and coherency in interfaces between the phases will also affect the properties of the hard metals. Accordingly, the mechanical properties of hard metals can be improved by strengthening both phases, or by adjusting various other factors that affect the microstructure and mechanical properties of the hard metals. In this paper we review the factors that have been identified as controlling the microstructure and associated properties, as well as the diverse research concerning the improvement of hard metals. We ultimately conclude that fine grains of solid-solution strengthened carbides with hard metallic phases are necessary for producing hard metals with superior mechanical properties, as is the formation of a coherent interfacial structure, as the interfacial area is relatively weaker than the grain inside.","PeriodicalId":495698,"journal":{"name":"세라미스트","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135085924","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}

{"title":"Surveying Metal Catalysts for Electrochemical Direct Oxidation of Small Organic Compounds","authors":"Sangwon Lee, Jiseon Kim, Kangwoo Cho","doi":"10.31613/ceramist.2023.26.3.01","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.3.01","url":null,"abstract":"Electrochemical degradation of organic molecules is important in wastewater treatment. In addition, the direct oxidation of small organics can be utilized for electrochemical hydrogen production or fuel cell. This study aimed to provide database for various anode catalysts that can degrade organic molecules such as urea, methanol, ethanol, glucose, ammonia, formic acid, acetic acid, oxalic acid in various pH conditions. Pt, Ni, Cu anodes were employed, and the target molecule concentration was 0.3 M. The activity was analyzed by the peak current densities of cyclic voltammetry. The Cu showed activity in the reaction of decomposing glucose and ammonia at pH 14. The Ni was active in ammonia degradation at pH 7, and the Pt was active in oxalic acid oxidation at pH 0. Relevant mechanisms were proposed for these reactions. We suggest Cu-Ni composites for toilet wastewater treatment and Pt for handling anaerobic digestor effluent.","PeriodicalId":495698,"journal":{"name":"세라미스트","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135085931","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}

{"title":"First-principles study on transition-metal doping and band-structure modulation in ZnO","authors":"Youngho Kang","doi":"10.31613/ceramist.2023.26.3.09","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.3.09","url":null,"abstract":"Transparent conducting oxides (TCOs) have both the electrical conductivity of a metal and the optical transparency of an insulator. Due to this unique feature, TCO is utilized in various applications such as flat panel displays, solar cells, light emitting diodes, and smart windows. At present, Sn-doped In₂O₃ (ITO) is the most widely used in the TCO market because of the superior materials properties. However, due to the demand for higher conductivity, instability of indium supply and high price, research to find new TCO materials has been continuously conducted. In this study, to develop a new TCO based on ZnO, we investigate the thermal stability of the transition metal dopants Sc and V and their effect on the band structure of ZnO using first-principles calculations. Our results show that Sc and V are efficient donors that can generate one free electron by substituting Zn when doped into ZnO. Furthermore, by analyzing the band structure of the doped system and calculating the electron effective mass, we show that Sc and V doping can be an important strategy to develop ZnO-based high-performance TCOs.","PeriodicalId":495698,"journal":{"name":"세라미스트","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135085927","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}

{"title":"Ab initio modeling of realistic tetrachloroaluminate intercalation into van der Waals electrode materials","authors":"Kanghoon Yim, Rizcky Tamarany","doi":"10.31613/ceramist.2023.26.3.08","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.3.08","url":null,"abstract":"Aluminum-ion batteries (AIBs) have recently attracted much attention due to their very fast charging and discharging speeds and excellent cycle stability. Unlike lithium-ion batteries, AIBs can be designed using a variety of ions, and the operating mechanism of ion intercalation in actual battery systems has not been fully clarified. Among them, the AIB based on tetrachloroaluminate(AlCl₄⁻) ion has the fastest charging and discharging speed and more than 8,000 cycles of cycle stability. However, due to the large size of the AlCl₄⁻ ion (∼ 5.28 Å), there has been controversy over its actual intercalation/deintercalation behavior and it is difficult to explain the characteristics of AIBs with very fast ion exchange behavior and excellent cycle stability. Theoretical studies using first-principles calculations have reported that the most stable structure when AlCl₄⁻ ion is inserted into graphite is that the ion intercalation gallery of graphite should be extended to∼9 Å. However, this is in contradiction with the experimental observation results (∼5.7 Å). In this paper, we solved this discrepancy between theory and experiment, and proposed a first-principles calculation-based computational simulation model that considers more realistic ion intercalation conditions. We found that the operating mechanism of AlCl₄⁻ ion intercalation can vary depending on the range of expansion of the out-of-plane lattice constant of the graphite structure. In other words, when the distance between the ion insertion galleries is physically constrained and a deformation force exists, AlCl₄⁻ ion is stabilized to have a flat planar shape, which is in good agreement with the experimental observation results. We also applied the computational simulation model that considers this behavior to explain the AlCl₄⁻ ion intercalation mechanism in 2D van der Waals electrode materials with confined out-of-plane lattice lengths, and predicted the battery performance of aluminum-ion battery electrodes in hetero-structures where different 2D materials form interfaces.","PeriodicalId":495698,"journal":{"name":"세라미스트","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135085792","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}

{"title":"Research Trends in One-dimensional Nanostructures based Gas Sensors fabricated by Glancing Angle Deposition","authors":"Seunggi Lee, Jae Han Chung, Yun Haeng Cho, Donghwi Cho, Young-Seok Shim","doi":"10.31613/ceramist.2023.26.3.06","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.3.06","url":null,"abstract":"One-dimensional (1D) nanostructures allow for precise control of geometrical size and shape, offering greater design flexibility than other nanostructures. 1D nanostructures, in particular, hold immense potential for revolutionizing the gas sensor field, owing to their extensive surface areas conducive to chemical reactions. To harness this potential, researchers have dedicated their efforts to developing fabrication methods that incorporate 1D nanostructures into gas sensor applications. Various techniques have been explored, including hydrothermal synthesis, electrospinning, sol-gel processes, solid-state chemical reactions, vapor-phase transport, and chemical vapor deposition. Despite these advancements, challenges regarding uniformity and reproducibility persist. In this report, we review the glancing angle deposition (GLAD) technique for applying 1D nanostructures to gas sensors and discuss to the potential of GLAD in overcoming existing limitations and driving forward the realm of 1D nanostructure-based gas sensors.","PeriodicalId":495698,"journal":{"name":"세라미스트","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135085686","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}

{"title":"Estimation of optimal conditions for crystallization of calcium fluoride for treatment of high-concentration fluorine-containing industrial wastewater","authors":"Ga-young Lee, Kang Seong Min, Kang Seong Chung","doi":"10.31613/ceramist.2023.26.3.02","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.3.02","url":null,"abstract":"This study attempted to utilize fluidized bed reactor for fluoride removal and CaF₂ purity from the industrial wastewater including high concentration of fluoride ion. Effects of HRT, pH, Ca₂⁺ amount and seed height were investigated through lab-scale batch and continuous experiments. Considering fluoride removal efficiently and CaF₂ purity that HRT 5hr, pH6, seed height of 50 cm, [Ca₂⁺]/[F^-](mol/mol) ratio of 0.55 were found to be optimum. Correspondingly, removal fluoride was 82.5%, with a CaF₂ the crystallization rate of 95.1%, respectively. The results of continuous experiment showed that with pellet as CaF₂ , fluoride concentration can be stably reduced to less than 45mg/L in effluent from the influent 300mg/L on average. HR-XRD analysis showed that the crystalline structure of crystals was mainly CaF₂ .","PeriodicalId":495698,"journal":{"name":"세라미스트","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135085926","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}

{"title":"Recent Advances and Trends in Photoelectrochemical Hybrid Water Electrolysis","authors":"Chanmin Jo, Dong Kyu Lee, Hyunjung Lee, Tae-Eon Park, Uk Sim, Young-Hoon Yun","doi":"10.31613/ceramist.2023.26.3.07","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.3.07","url":null,"abstract":"The replacement of fossil fuels is urgently needed for carbon neutrality and sustainable development. Hydrogen is represented as a next-generation energy source, and among the various methods to obtain hydrogen, water electrolysis using catalysts has been studied steadily. Among them, photoelectrochemical water electrolysis using solar energy is a promising method, but it has problems such as high overvoltage, durability of photoelectrodes under aqueous electrolyte environment, and photocorrosion. Therefore, recently, there has been increasing interest in hybrid water electrolysis, which improves efficiency by reducing the high overvoltage of water electrolysis by adding sacrificial materials. In this article, we review various photoelectrochemical hybrid water electrolysis studies and their limitations.","PeriodicalId":495698,"journal":{"name":"세라미스트","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135085921","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}

{"title":"Technologies for manufacturing of Bi-Te-based thermoelectric materials","authors":"Myung Sik Choi, Kyu Hyoung Lee","doi":"10.31613/ceramist.2023.26.3.03","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.3.03","url":null,"abstract":"Bismuth-Telluride(Bi-Te)-based alloys are well-known for their high thermoelectric conversion efficiency, especially near room temperature, making them ideal for applications in solid-state refrigeration and power generation from waste heat. However, to expand their applications further, it is essential to improve their performance and reliability. To achieve these goals, recent research has been dedicated to developing processing technologies that can concurrently enhance the thermoelectric and mechanical properties. This is particularly crucial because the manufacturing process for these materials is intricate and demands precise parameter control to ensure the production of high-quality products. This review offers a comprehensive overview of the process technology employed in manufacturing Bi-Te-based thermoelectric materials, alongside introducing a cutting-edge near net shape hot extrusion technique recently developed for their production.","PeriodicalId":495698,"journal":{"name":"세라미스트","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135086044","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}