Korean Journal of Chemical Engineering最新文献

{"title":"AI-Based Prediction Module of Key Neutronic Characteristics to Optimize Loading Pattern for i-SMR with Flexible Operation","authors":"Jungseok Kwon,&nbsp;Tongkyu Park,&nbsp;Sung Kyun Zee","doi":"10.1007/s11814-024-00240-z","DOIUrl":"10.1007/s11814-024-00240-z","url":null,"abstract":"<div><p>This paper proposes an AI-based module for a loading pattern (L/P) optimization algorithm applied to the i-SMR, designed for flexible operation. The AI module can be used as a surrogate model in the simulated annealing (SA) screening process, which allows for more efficient optimization. The convolution neural network (CNN) model was trained using reactor core L/Ps and corresponding core parameter values derived from a realistic core simulation code. For load-following operations, we selected core parameters such as control rod insertion depth, radial peaking factor, axial shape index, and effective multiplication factor. To calculate the objective function of an L/P during the SA process using core design codes, it takes approximately 3 s, while the AI-based module can predict the objective function within about 0.1 ms. During the prediction of selected parameters, we discovered two factors affecting prediction accuracy. First, the model exhibited a significant increase in error when trained on dataset containing negative values. Second, utilizing batch normalization (BN) layer and squeeze and excitation (SE) module, intended to improve accuracy, resulted in a decrease in performance of the model. Our study demonstrated that the CNN-based model achieves excellent prediction accuracy and has an ability to accelerate optimization algorithms by taking advantage of artificial intelligence’s inherent computational speed.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"41 10","pages":"2741 - 2759"},"PeriodicalIF":2.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141885979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of the Ge@GeO2-C Composite Anode Synthesized Using a Simple High-Energy Ball-Milling Process for Li-Ion Batteries","authors":"Hyun Woo Kim,&nbsp;Jinhyup Han","doi":"10.1007/s11814-024-00245-8","DOIUrl":"10.1007/s11814-024-00245-8","url":null,"abstract":"<div><p>To address the limitations of the current anodes of Li⁺-ion batteries (LIBs), a Ge/GeO₂/carbon (Ge@GeO₂-C) composite was designed by introducing a high-energy ball-milling process for advanced LIBs. Ge@GeO₂-C is prepared and characterized by XPS, XRD, SEM, and TEM, which facilitate synthesis and provide controllability with respect to milling time. Interestingly, as the ball-milling time increased, the proportion of metallic Ge increased during the carbon thermal reduction reaction. The electrochemical characteristics of Ge@GeO₂-C are assessed using differential capacity analysis (dQ/dV) and galvanostatic charge–discharge techniques to confirm its viability as an anode material in LIBs. The results demonstrate decent initial and secondary capacities of approximately 1800 mAh g⁻¹ (for the first cycle) and 838 mAh g⁻¹ (for the second cycle) at a rate of C/60 by the reaction between Ge and the Li–Ge complex. Furthermore, post-mortem characterization was performed to gain an understanding of the material, suggesting future prospects for advanced LIBs.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"41 11","pages":"3019 - 3026"},"PeriodicalIF":2.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141887360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Dendrite-Free Lithium Metal Battery by Incorporating Poly(dimethylsiloxane) Layer onto the Porous Three-Dimensional Copper Current Collector","authors":"Jihyeok Song,&nbsp;Subin Lee,&nbsp;Youngkwang Kim,&nbsp;Yung-Eun Sung,&nbsp;Taeeun Yim,&nbsp;Oh Joong Kwon","doi":"10.1007/s11814-024-00241-y","DOIUrl":"10.1007/s11814-024-00241-y","url":null,"abstract":"<div><p>As an anode, lithium metal electrode is one of the most promising candidates for lithium batteries because of their theoretically high specific capacity and low redox potential. However, lithium dendrites are formed during the cycle of lithium deposition and dissolution on the copper current collector during charging and discharging, threatening the stability and durability of lithium metal batteries (LMBs). In this study, a three-dimensional (3D) porous copper coated with a polymer layer (polydimethylsiloxane, PDMS) is used as a current collector to ensure high stability. A PDMS-coated 3D porous current collector is prepared by Cu electrodeposition using hydrogen bubbles as a template followed by a PDMS coating. PDMS coating is performed by spin coating of PDMS on a slide glass and transferring it to the current collector. The 3D current collector functionalized by PDMS offers prolonged lifespans in both Li deposition/dissolution and intercalation of the lithium iron phosphate cathode, as the functionalized PDMS-coated 3D porous current collector effectively prevents the growth of Li dendrites at the interface.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"41 11","pages":"3027 - 3034"},"PeriodicalIF":2.9,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assembly of ITO Nanocrystals into Nanotubes Using Polycarbonate Membranes for Dual-Band Electrochromic Modulation","authors":"Sungbin Kim,&nbsp;Jungchul Noh,&nbsp;Sungyeon Heo","doi":"10.1007/s11814-024-00242-x","DOIUrl":"10.1007/s11814-024-00242-x","url":null,"abstract":"<div><p>Assembling doped metal oxide nanocrystals (NCs) into one-dimensional (1D) structures can enhance the optical and electrochemical properties of thin films. However, achieving this assembly without damaging the NCs’ properties has been challenging. Here, we present facile method to assemble near-infrared (NIR) absorbing plasmonic indium tin oxide (ITO) NCs into 1D nanotubes (NTs) using track-etched polycarbonate (PC) membranes as templates. By infiltrating freestanding PC membranes with 3% doped ITO NCs, attaching them to an adhesive layer, and then annealing, we produce robust ITO NTs on substrates. Fabricated ITO NTs, featuring mesopores and macropores, exhibit rapid NIR modulation under electrochemical potential while maintaining static visible opacity, making them useful for privacy protection and thermal management. Incorporating NbO_x into these ITO NT films demonstrates rapid switching and electrochemically stable visible and NIR dual-band electrochromic modulation, highlighting the significance of structuring NCs.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"41 11","pages":"3053 - 3058"},"PeriodicalIF":2.9,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"β-Cyclodextrin-Grafted Cobalt-Aluminum Bimetallic Oxide Modified Acrylic Ester Resin for Oil/Water Separation","authors":"Jie Wen,&nbsp;Yanjun Lyu,&nbsp;Lianhong Zhang,&nbsp;Yuling Ma,&nbsp;Xia Huang,&nbsp;Wanyu Zhu","doi":"10.1007/s11814-024-00208-z","DOIUrl":"10.1007/s11814-024-00208-z","url":null,"abstract":"<div><p>A novel method was developed to introduce β-cyclodextrin (β-CD) cage-like macromolecules into acrylic ester resin using metal oxides as a medium, resulting in high-oil-absorption resin composites. β-CD was first grafted onto the surface of cobalt-aluminum bimetallic oxide (CoAl-LDO) via a facile hydrothermal method in an alkaline environment, generating more pore structures. To enhance the hydrophobic properties of β-CD-grafted CoAl-LDO nanoparticles, KH-570 was employed as a modifier to modify nanoparticles. Finally, the β-CD-grafted CoAl-LDO/acrylic ester resin composite was successfully synthesized by suspension polymerization method. The oil absorption performance of the resin composite was evaluated using various solvents. Its saturated capacity reached 18.62 g/g for cyclohexane, 19.92 g/g for toluene, and a remarkable 31.42 g/g for trichloromethane. Even for diesel, a challenging oil due to its viscosity, the absorption reached a noteworthy 16.17 g/g. Further demonstrating its selectivity, the composite strictly adsorbed oil while repelling water. Notably, the impressive capacity remained largely unchanged after eight regeneration cycles.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 2","pages":"383 - 392"},"PeriodicalIF":2.9,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of an Atopic Dermatitis Incidence Rate Prediction Model for South Korea Using Air Pollutants Big Data: Comparisons Between Regression and Artificial Neural Network","authors":"Byeonggeuk Lim,&nbsp;Poong-Mo Park,&nbsp;Da-Mee Eun,&nbsp;Dong-Woo Kim,&nbsp;Cheonwoong Kang,&nbsp;Ki-Joon Jeon,&nbsp;SeJoon Park,&nbsp;Jong-Sang Youn","doi":"10.1007/s11814-024-00244-9","DOIUrl":"10.1007/s11814-024-00244-9","url":null,"abstract":"<div><p>We have developed models to predict the incidence of atopic dermatitis using regression analysis and artificial neural networks (ANN). Initially, the prediction models were created using various inputs, including air pollutants (SO₂, CO, O₃, NO₂, and PM₁₀), meteorological factors (temperature, humidity, wind speed, and precipitation), population rates, and clinical data from South Korea, referred to as the average model. Subsequently, we developed models that use sex and age as variables instead of population rates, named the sex and age model. Both sets of models were designed to forecast incidence rates on a nationwide scale (NW), as well as for 16 administrative districts (AD) in South Korea, which includes seven metropolitan areas and nine provinces. We found that SO₂ significantly affected the incidence rate, and the inclusion of regional variables in the AD models helped account for regional variations in incidence rates. The average models generally provided accurate predictions of incidence rates, with SO₂ chosen as the key independent variable in the regression models for the five air pollutants studied. The <i>R</i>² values for the average models using regression are 0.70 for the NW model and 0.89 for the AD model. Among the ANN-based models, the <i>R</i>² values are 0.84 for the NW model and 0.90 for the AD model, this indicated a slightly higher predictive accuracy. For the sex and age models, we differentiated between children under 10 years of age and those older. In these models, ANN demonstrated greater accuracy than regression, with <i>R</i>² values of 0.95, 0.92, 0.96, and 0.92 for the sex and age NW model under 10 years old, sex and age AD model under 10 years old, sex and age NW model over 10 years old, and sex and age AD model over 10 years old, respectively.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 1","pages":"109 - 119"},"PeriodicalIF":2.9,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent Progress in Blue-Emitting Semiconductor Nanocrystal Quantum Dots for Display Applications","authors":"Seongwoo Cho,&nbsp;Yeongcheol Kim,&nbsp;Seunghyun Lee,&nbsp;Ju Young Woo","doi":"10.1007/s11814-024-00238-7","DOIUrl":"10.1007/s11814-024-00238-7","url":null,"abstract":"<div><p>Solution-processable semiconductor nanocrystal quantum dots possess remarkable optical characteristics, including high photoluminescence quantum yield, narrow photoluminescence linewidth, and size-dependent color tunability. Three primary colors, which are red, green, and blue, are essential for realization of electroluminescent display utilizing quantum dots. While extensive research has been conducted on red- and green-emitting quantum dots, the development of blue-emitting quantum dots lags behind other primary color materials. This comprehensive review provides an overview of the progress in the synthesis of various types of blue-emitting quantum dots and their device applications. Furthermore, perspectives on further advancement of blue-emitting quantum dots to meet the requirements for commercially viable electroluminescent displays is discussed.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"41 13","pages":"3359 - 3370"},"PeriodicalIF":2.9,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fence Line Monitoring of Petroleum Refining Plants in Korea: UV-DOAS Analysis of SO2, NO2, and Benzene Emissions for Comprehensive Management","authors":"Cheonwoong Kang,&nbsp;Dongwoo Kim,&nbsp;Jeonghun Kim,&nbsp;Sunghwan Cho,&nbsp;Jungung Yu,&nbsp;Daeil Kang,&nbsp;Poongmo Park,&nbsp;Kijoon Jeon","doi":"10.1007/s11814-024-00220-3","DOIUrl":"10.1007/s11814-024-00220-3","url":null,"abstract":"<div><p>Increasing public interest in air pollutants driven by climate change and high concentrations of particulate matter (PM) has highlighted the importance of managing pollutants, such as SO₂, NO₂, and benzene. These compounds are known precursors of secondary PM that affect the climate and human health, with benzene being particularly carcinogenic. Benzene is a volatile organic compound (VOC) that can persist in the atmosphere for approximately 9.4 days, potentially traveling long distances and contributing to the generation of secondary organic aerosols (SOAs) through photochemical reactions, leading to elevated fine dust concentrations. To comprehensively manage emissions, leaks, and point sources, a fence line monitoring study was conducted at petroleum refining industrial complexes in Daesan-eup, Chungcheongnam-do, and Yeosu-si, Jeollanam-do in Korea. Ultraviolet Differential Optical Absorption Spectroscopy (UV-DOAS) technology was used to confirm measurement reliability and monitor emissions. High SO₂ concentrations emitted in a specific direction were identified at the Yeosu-si, and further investigation identified the flare stack of a suspected plant as the emission source. Fence line monitoring was effective in identifying and addressing unknown high-concentration emission sources and devising measures to manage fugitive emissions and leaks.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 1","pages":"99 - 108"},"PeriodicalIF":2.9,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advances in Flexible, Foldable, and Stretchable Quantum Dot Light-Emitting Diodes: Materials and Fabrication Strategies","authors":"Taewoo Park,&nbsp;Ji Su Kim,&nbsp;Daewon Ko,&nbsp;Gi Doo Cha,&nbsp;Dae-Hyeong Kim,&nbsp;Dong Chan Kim","doi":"10.1007/s11814-024-00236-9","DOIUrl":"10.1007/s11814-024-00236-9","url":null,"abstract":"<div><p>Deformable light-emitting devices, capable of maintaining consistent light emission even under mechanical deformations, represent a cornerstone for next-generation human-centric electronics. Quantum dot light-emitting diodes (QLEDs), leveraging the electroluminescence (EL) of colloidal quantum dots (QDs), show exceptional promise in this domain. Their superior advantages, such as excellent color purity, high luminous efficiency, slim form factor, and facile fabrication on various soft substrates, position them as prime candidates for deformable EL devices. This review explores recent advancements in deformable QLEDs, with a particular focus on material engineering and fabrication strategies. We begin by introducing various types of QDs and the operational principles of QLEDs, along with summarizing performance enhancements in reported deformable devices. Next, we categorize device structures based on the direction of light emission. We then discuss representative methods for patterning QD thin films on flexible substrates to fabricate full-color QLEDs. Additionally, we highlight fabrication strategies for deformable QLEDs with unconventional form factors, including flexible, foldable, fiber-type, and stretchable devices, and their potential applications. We conclude this review with a brief outlook on the future of this technology.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"41 13","pages":"3517 - 3543"},"PeriodicalIF":2.9,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and Characterization of Quercetin-Functionalized Gold Nanoparticles for Screening Anticancer Potentials: A Flow Cytometry Approach","authors":"Jiyoung Lee,&nbsp;Roopkumar Sangubotla,&nbsp;Jongsung Kim","doi":"10.1007/s11814-024-00234-x","DOIUrl":"10.1007/s11814-024-00234-x","url":null,"abstract":"<div><p>The gold nanoparticles (AuNPs) were synthesized via the Turkevich-Frens approach, conjugated with polyphenol moieties named quercetin (Qu), and prepared as Au-Qu NPs. In this study, we investigated the anticancer activity of the Au-Qu NPs through an apoptosis assay and a live/dead staining assay. The cell viability and apoptosis studies of the synthesized AuNPs and Au-Qu NPs were investigated on mouse embryonic fibroblast cells (NIH/3T3) and human cervical cancer cell lines (HeLa). Interestingly, minimal cytotoxicity was observed in 3T3 cells. Also, an apoptosis assay was conducted using the flow cytometry approach to investigate the cell death in both 3T3 and HeLa cells after the treatment of AuNPs and Au-Qu NPs using Annexin-FITC and propidium iodide (PI) dyes. The apoptosis studies were performed in both 3T3 and HeLa cells, and the Au-Qu NPs exhibited a reasonably increased apoptosis of 34.5% in HeLa cells as compared to AuNPs in HeLa cells (32.2%). Thus, the Au-Qu NPs are more suitable for investigating anticancer properties than AuNPs. In addition, Au-Qu NPs are displaying less early apoptosis (40.5%) than AuNPs (54.7%) in 3T3 cells, which suggests that Au-Qu NPs are biocompatible in healthy cells. The live/dead assay results obtained in 3T3 and HeLa cells in a time-dependent manner (0, 6, 12, and 24 h) have demonstrated the potential cell viability and cell toxicity in response to AuNPs and Au-Qu NPs.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"41 11","pages":"3095 - 3103"},"PeriodicalIF":2.9,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}