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| WoS | SCOPUS | Document Type | Document Title | Abstract | Authors | Affiliation | ResearcherID (WoS) | AuthorsID (SCOPUS) | Author Email(s) | Journal Name | JCR Abbreviation | ISSN | eISSN | Volume | Issue | WoS Edition | WoS Category | JCR Year | IF | JCR (%) | FWCI | FWCI Update Date | WoS Citation | SCOPUS Citation | Keywords (WoS) | KeywordsPlus (WoS) | Keywords (SCOPUS) | KeywordsPlus (SCOPUS) | Language | Publication Stage | Publication Year | Publication Date | DOI | JCR Link | DOI Link | WOS Link | SCOPUS Link |
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| ○ | ○ | Article | Nanoristors: highly uniform, sub-500-millivolt, large-scale, and robust molybdenum disulfide nanograined memristors | Memristors are garnering attention as promising electronic synapse and nonvolatile memory devices owing to their high density and analog switching with low energy consumption. However, most conventional memristors suffer not only from device-to-device and cycle-to-cycle variations but also from a destructive conductive filament (CF)-forming process, which are issues that must be addressed to use memristors in practical applications. Here, we demonstrate a highly robust and reliable memristor array using molybdenum disulfide (MoS2) nanograins, named nanoristors. MoS2 films with 7-10 nm nanograins were synthesized using plasma-enhanced chemical vapor deposition. We confirmed that tens of thousands of grain boundaries exist in a 1 mu m x 1 mu m area, resulting in memory operation with exceptionally high uniformity and excellent endurance (>2300 cycles). Moreover, vertically formed grain boundaries and defects work as a guiding route for Ag+ ion diffusion, resulting in forming-free operation with a low switching voltage of less than 500 mV. Furthermore, the MoS2 nanoristor successfully emulated potentiation and depression characteristics which are essential for online learning in neuromorphic systems. The face recognition functionality of the MoS2 nanoristor-based synapse device is evaluated using the device-to-system simulation. As the proposed approach of fabricating nanograined MoS2 leads to highly uniform and robust operation of memristors, it is expected that nanoristors fabricated using layered nanomaterials will open up new opportunities for achieving electronic synapse and memory devices for application in neuromorphic electronic systems. | Woo, Gunhoo; Kim, Hyeong-U; Jang, Byung Chul; Naqi, Muhammad; Hong, Seongin; Bala, Arindam; Kang, Seunghun; Kim, Yunseok; Kim, Sunkook; Kim, Taesung; Kim, Jae-Joon; Yoo, Hocheon | Sungkyunkwan Univ SKKU, SKKU Adv Inst Nanotechnol, Suwon, South Korea; Korea Inst Machinery & Mat KIMM, Semicond Mfg Res Ctr, Daejeon, South Korea; Kyungpook Natl Univ, Sch Elect & Elect Engn, 41566 80 Daehakro, Daegu, South Korea; Sungkyunkwan Univ SKKU, Sch Adv Mat Sci & Engn, Suwon, South Korea; Gachon Univ, Dept Phys, Seongnam 13120, South Korea; Sungkyunkwan Univ SKKU, Sch Mech Engn, Suwon, South Korea; Seoul Natl Univ, Dept Elect & Comp Engn, Seoul 08826, South Korea; Seoul Natl Univ, Interuniv Semicond Res Ctr, Seoul 08826, South Korea; Gachon Univ, Dept Elect Engn, Seongnam, South Korea; Univ Sci & Technol UST, Nanomechatron, Daejeon, South Korea; Seoul Natl Univ, Interuniv Semicond Res Ctr, Seoul, South Korea | Naqi, Muhammad/ABG-6265-2021; Jang, Byung Chul/GYV-0656-2022; Kim, Hyeong-U/AAV-2668-2021; Yoo, Hocheon/ABZ-6637-2022; Hong, Seongin/AAS-3551-2021 | 57219875023; 56420633500; 9238827900; 57193271744; 56982097100; 57209077061; 57201351045; 57200906063; 14060236800; 15835496400; 55954142000; 56637576900 | seonkuk@skku.edu;tkim@skku.edu;kimjaejoon@snu.ac.kr;hyoo@gachon.ac.kr; | JOURNAL OF MATERIALS CHEMISTRY C | J MATER CHEM C | 2050-7526 | 2050-7534 | 12 | 17 | SCIE | MATERIALS SCIENCE, MULTIDISCIPLINARY;PHYSICS, APPLIED | 2024 | 5.1 | 23.8 | 0.61 | 2025-05-07 | 2 | 2 | TRANSITION-METAL DICHALCOGENIDES; MOS2; CONVERSION; DAMAGE; FILMS | Energy utilization; Face recognition; Grain boundaries; Layered semiconductors; Memristors; Online systems; Plasma CVD; Plasma enhanced chemical vapor deposition; Conductive filaments; Cycle to cycle variation; Grain-boundaries; Large-scales; Low energy consumption; Memory operations; Memristor; Nano grains; Nonvolatile memory devices; Synthesised; Molybdenum disulfide | English | 2024 | 2024-05-02 | 10.1039/d3tc04265k | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |||
| ○ | Article | Peptide-mediated targeted delivery of SOX9 nanoparticles into astrocytes ameliorates ischemic brain injury | Astrocytes are highly activated following brain injuries, and their activation influences neuronal survival. Additionally, SOX9 expression is known to increase in reactive astrocytes. However, the role of SOX9 in activated astrocytes following ischemic brain damage has not been clearly elucidated yet. Therefore, in the present study, we investigated the role of SOX9 in reactive astrocytes using a poly-lactic-co-glycolic acid (PLGA) nanoparticle plasmid delivery system in a photothrombotic stroke animal model. We designed PLGA nanoparticles to exclusively enhance SOX9 gene expression in glial fibrillary acidic protein (GFAP)-immunoreactive astrocytes. Our observations indicate that PLGA nanoparticles encapsulated with GFAP:SOX9:tdTOM reduce ischemia-induced neurological deficits and infarct volume through the prostaglandin D2 pathway. Thus, the astrocyte-targeting PLGA nanoparticle plasmid delivery system provides a potential opportunity for stroke treatment. Since the only effective treatment currently available is reinstating the blood supply, cell-specific gene therapy using PLGA nanoparticles will open a new therapeutic paradigm for brain injury patients in the future. We describes the development of a poly-lactic-coglycolic acid (PLGA) nanoparticle-based system for conjugation of targeting peptides to PLGA nanoparticles and delivery of the therapeutic gene SOX9 to damaged astrocytes in a mouse stroke model. | Shin, Hyo Jung; Choi, Seung Gyu; Qu, Fengrui; Yi, Min-Hee; Lee, Choong-Hyun; Kim, Sang Ryong; Kim, Hyeong-Geug; Beom, Jaewon; Yi, Yoonyoung; Kim, Do Kyung; Joe, Eun-Hye; Song, Hee-Jung; Kim, Yonghyun; Kim, Dong Woon | Chungnam Natl Univ, Dept Med Sci, Daejeon 35015, South Korea; Chungnam Natl Univ, Dept Anat & Cell Biol, Daejeon 35015, South Korea; Chungnam Natl Univ, Brain Res Inst, Daejeon 35015, South Korea; Univ Alabama, Dept Chem & Biochem, Tuscaloosa, AL 35487 USA; Mayo Clin, Dept Neurol, Rochester, MN 55905 USA; Dankook Univ, Coll Pharm, Dept Pharm, Cheonan 31116, South Korea; Kyungpook Natl Univ, BK21 KNU Creat BioRes Grp 4, Sch Life Sci, Brain Sci & Engn Inst, Daegu 41566, South Korea; Indiana Univ Sch Med, Dept Biochem & Mol Biol, Indianapolis, IN 46202 USA; Seoul Natl Univ, Bundang Hosp, Dept Rehabil Med, Seongnam 13620, South Korea; Hallym Univ, Coll Med, Dept Pediat, Seoul 05355, South Korea; Gangdong Sacred Heart Hosp, Seoul 05355, South Korea; Konyang Univ, Coll Med, Dept Anat, Daejeon 35365, South Korea; Ajou Univ, Sch Med, Dept Biomed Sci, Neurosci Grad Program, Worldcup Ro 164, Suwon 16499, Kyunggi, South Korea; Chungnam Natl Univ, Dept Neurol, Sejong 30099, South Korea; Sejong Hosp, Sejong 30099, South Korea; Univ Alabama, Dept Chem & Biol Engn, Tuscaloosa, AL 35487 USA | Yi, Min-Hee/CAF-1860-2022; lee, hy/GRS-0797-2022 | ykim@eng.ua.edu;visnu528@cnu.ac.kr; | NANOSCALE | NANOSCALE | 2040-3364 | 2040-3372 | 16 | 2 | SCIE | CHEMISTRY, MULTIDISCIPLINARY;MATERIALS SCIENCE, MULTIDISCIPLINARY;NANOSCIENCE & NANOTECHNOLOGY;PHYSICS, APPLIED | 2024 | 5.1 | 23.8 | 3 | NEUROPATHIC PAIN; HEME OXYGENASE-1; EXPRESSION; GENE; NEUROPROTECTION; GENERATION; DISEASE | English | 2024 | 2024-01-03 | 10.1039/d3nr01318a | 바로가기 | 바로가기 | 바로가기 | ||||||||||
| ○ | ○ | Article | Potentiating effect of AMD3100 on bone morphogenetic protein-2 induced bone regeneration | Background AMD3100, a CXCR4 antagonist, is currently prescribed for activating the mobilization of hematopoietic stem cells. Recently, AMD3100 was shown to potentiate bone morphogenetic protein-2 (BMP-2)-induced bone formation by stimulating the trafficking of mesenchymal cells. However, optimization of the strategic combination of AMD3100 and BMP-2 has not yet been clearly established. The purpose of this study was to evaluate the effect of AMD3100 on BMP-2-induced bone regeneration in vitro and in a mouse calvarial defect healing model.Methods In vitro osteoblastic differentiation and cell migration after sequential treatments with AMD3100 and BMP-2 were analyzed by alkaline phosphatase (ALP) activity, ALP staining, and calcium accumulation. Migration capacity was evaluated after treating mesenchymal cells with AMD3100 and/or BMP-2. A critical-size calvarial defect model was used to evaluate bone formation after sequential or continuous treatment with AMD3100 and BMP-2. The degree of bone formation in the defect was analyzed using micro-computed tomography (micro-CT) and histological staining.Results Compared with single treatment using either AMD3100 or BMP-2 alone, sequential treatment with AMD3100 followed by BMP-2 on mesenchymal cells increased osteogenic differentiation. Application of AMD3100 and subsequent BMP-2 significantly activated cell migration on mesenchymal cell than BMP-2 alone or AMD3100 alone. Micro-CT and histomorphometric analysis showed that continuous intraperitoneal (IP) injection of AMD3100 resulted significantly increased new bone formation in BMP-2 loaded scaffold in calvarial defect than control groups without AMD3100 IP injection. Additionally, both single IP injection of AMD3100 and subsequent BMP-2 injection to the scaffold in calvarial defect showed pronounced new bone formation compared to continuous BMP-2 treatment without AMD3100 treatment.Results Compared with single treatment using either AMD3100 or BMP-2 alone, sequential treatment with AMD3100 followed by BMP-2 on mesenchymal cells increased osteogenic differentiation. Application of AMD3100 and subsequent BMP-2 significantly activated cell migration on mesenchymal cell than BMP-2 alone or AMD3100 alone. Micro-CT and histomorphometric analysis showed that continuous intraperitoneal (IP) injection of AMD3100 resulted significantly increased new bone formation in BMP-2 loaded scaffold in calvarial defect than control groups without AMD3100 IP injection. Additionally, both single IP injection of AMD3100 and subsequent BMP-2 injection to the scaffold in calvarial defect showed pronounced new bone formation compared to continuous BMP-2 treatment without AMD3100 treatment.Conclusion Our data suggest that single or continuous injection of AMD3100 can potentiate BMP-2-induced osteoblastic differentiation and bone regeneration. This strategic combination of AMD3100 and BMP-2 may be a promising therapy for bone regeneration. | Shim, Gyu-Jo; Lee, Chung O.; Lee, Jung-Tae; Jung, Hong-Moon; Kwon, Tae-Geon | Kyungpook Natl Univ, Sch Dent, Dept Oral & Maxillofacial Surg, Daegu, South Korea; Kyungpook Natl Univ, Inst Translat Res Dent, Daegu, South Korea; Daegu Hlth Coll, Dept Radiol Technol, Daegu, South Korea; Kyungpook Natl Univ, Sch Dent, Dept Oral & Maxillofacial Surg, 2177 Dalgubeol Daero, Daegu 41940, South Korea; Kyungpook Natl Univ, Inst Translat Res Dent, 2177 Dalgubeol Daero, Daegu 41940, South Korea | 57653519600; 56112929000; 56646664200; 59593055000; 35205433300 | kwondk@knu.ac.kr; | MAXILLOFACIAL PLASTIC AND RECONSTRUCTIVE SURGERY | MAX PLAST RECONSTR S | 2288-8101 | 2288-8586 | 46 | 1 | ESCI | DENTISTRY, ORAL SURGERY & MEDICINE | 2024 | 2.8 | 23.8 | 0 | 2025-05-07 | 1 | 1 | AMD3100; Bone morphogenetic protein 2; Bone regeneration | OSTEOBLAST PROGENITOR CELLS; MESENCHYMAL STEM-CELLS; MARROW STROMAL CELLS; OSTEOGENIC DIFFERENTIATION; GROWTH; MOBILIZATION; SDF-1; SITE; NEOVASCULARIZATION; RECRUITMENT | AMD3100; Bone morphogenetic protein 2; Bone regeneration | alkaline phosphatase; bone morphogenetic protein 2; penicillin derivative; plerixafor; streptozocin; animal cell; animal experiment; Article; bone defect; bone marrow stroma cell; bone metabolism; bone regeneration; C3H/10T1/2 clone 8 cell line; cell differentiation; cell migration; cell migration assay; colony forming unit; computer assisted tomography; male; micro-computed tomography; mobilization; mouse; nonhuman; ossification; stem cell mobilization; surface property; tissue engineering | English | 2024 | 2024-06-17 | 10.1186/s40902-024-00431-y | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Radiant synergy: Illuminating methyl orange dye removal with g-C3N4/ZnO heterojunction photocatalyst | In this study, a robust hybrid heterojunction composite of g-C3N4/ZnO was successfully synthesized using a straightforward and cost-effective coprecipitation method. The resulting composite amalgamates the properties of graphitic carbon nitride (g-C3N4) and zinc oxide nanoparticles (ZnO NPs). Thorough characterization using techniques such as XRD, FT-IR, FE-SEM, HR-TEM, UV-DRS, EIS, PL, and EDX confirmed the structural and elemental composition of the catalyst. The challenge of using photons as the sole energy source for the activation of photocatalysts under ambient conditions was addressed. The photocatalytic potential of the hybrid heterojunctions was assessed by degrading the methyl orange (MO) dye under sunlight. The 10 wt% g-C3N4/ZnO composite exhibited effective suppression of charge recombination during photocatalytic degradation. Notably, the heterojunction 10 wt% g-C3N4/ZnO composite displayed remarkable photocatalytic performance, achieving a substantial 98 % degradation of MO within 90 min of solar irradiation, outperforming other materials. Moreover, the synthesized composites exhibited favorable attributes in terms of recyclability and mechanical stability, retaining their efficacy over five cycles. This substantiates their promising role as potential candidates for future photocatalyst applications. In essence, g-C3N4/ZnO heterojunction composites offer a robust solution for efficient and sustainable photocatalytic degradation of organic pollutants. | Thirugnanam, Rajachandrasekar; Kannan, Abina; Ramasundaram, Subramaniyan; Kumaravel, Sakthivel; Altaf, Mohammad; Oh, Tae Hwan; Jayababu, Srishankar; Narayanasamy, Sobana; Ganesamoorthy, Thirunarayanan; Inbasekaran, Muthuvel | MR Govt Arts Coll, Dept Chem, Photocatalysis Lab, Mannargudi 614001, Tamil Nadu, India; Yeungnam Univ, Sch Chem Engn, Geongsan 38436, South Korea; Saveetha Inst Med & Tech Sci SIMATS, Saveetha Sch Engn, Chennai 602105, Tamil Nadu, India; Kyungpook Natl Univ, Dept Environm Engn, 80 Daehak Ro, Daegu 41566, South Korea; King Saud Univ, Coll Sci, Dept Chem, POB 2455, Riyadh 11451, Saudi Arabia; Bharathiar Univ, Dept Chem Res & Dev, Coimbatore 641046, Tamil Nadu, India; Manakula Vinayagar Inst Technol, Dept Chem, Pondicherry 605107, India; Annamalai Univ, Dept Chem, Adv Photocatalysis Lab, Annamalainagar 608002, Tamil Nadu, India; MR Govt Arts Coll, Dept Chem, Photocatalysis Lab, Mannargudi 614001, Tamil Nadu, India | ; KUMARAVEL, SAKTHIVEL/KBC-0974-2024; Altaf, Mohammad/GVT-8819-2022; Muthuvel, Inbasekaran/AAB-8412-2019 | 58605210400; 59185092200; 24528972800; 57212580936; 58639675400; 57213539906; 57219979736; 57219980620; 58001402300; 16022143900 | taehwanoh@ynu.ac.kr;profmuthuvelchem@yahoo.com; | DIAMOND AND RELATED MATERIALS | DIAM RELAT MATER | 0925-9635 | 1879-0062 | 147 | SCIE | MATERIALS SCIENCE, COATINGS & FILMS;MATERIALS SCIENCE, MULTIDISCIPLINARY;PHYSICS, APPLIED;PHYSICS, CONDENSED MATTER | 2024 | 5.1 | 23.8 | 1.99 | 2025-05-07 | 3 | 6 | Heterojunction; g-C 3 N 4 /ZnO composite; Photocatalytic degradation; Methyl orange dye; Solar light irradiation | GRAPHITIC CARBON NITRIDE; HIGHLY EFFICIENT; DEGRADATION; ZNO; NANOCOMPOSITE; DRIVEN; CONSTRUCTION; COMPOSITES; MECHANISM; SPHERES | g-C<sub>3</sub>N<sub>4</sub>/ZnO composite; Heterojunction; Methyl orange dye; Photocatalytic degradation; Solar light irradiation | Activation energy; Azo dyes; Carbon nitride; Citrus fruits; Cost effectiveness; II-VI semiconductors; Irradiation; Mechanical stability; Organic pollutants; Photocatalytic activity; Solar light; ZnO nanoparticles; Coprecipitation method; Cost effective; Dye removal; G-C3N4/ZnO composite; Graphitic carbon nitrides; Methyl orange dyes; Photocatalytic degradation; Property; Solar light irradiation; Synthesised; Heterojunctions | English | 2024 | 2024-08 | 10.1016/j.diamond.2024.111325 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | Review | Strategic design of emerging (K,Na)NbO3-based perovskites for high-performance piezocatalysis and photo-piezocatalysis | As a leading Pb-free perovskite material (ABO3-type), potassium sodium niobate (K,Na)NbO3 (KNN)-based ferroelectrics/piezoelectrics have been widely used in electronics, energy conversion, and storage due to their exceptional ability to interconvert mechanical and electrical energies. Beyond traditional applications, the piezoelectric potential generated by mechanical strain or stress modifies their energy band structures and facilitates charge carrier separation and transport, drawing increasing attention in emerging fields such as piezocatalysis and photo-piezocatalysis. With excellent piezoelectric properties, chemical/ thermal stability, and strain-tuning capability, KNN-based materials show great promise for high-performance piezocatalytic applications. Coupling KNN with semiconductors exhibiting strong optical absorption to form heterojunctions further boosts performance by suppressing electron–hole recombination and promoting directed charge transfer, which is crucial for photo-piezocatalysis. The flexibility of KNN’s perovskite structures also allows for modifications in chemical composition and crystal structure, enabling diverse design strategies such as defect engineering, phase boundary engineering, morphology control, and heterojunction formation. This review comprehensively explores the recent advancements in KNN-based piezocatalysis and photo-piezocatalysis, starting with an overview of their crystal structures and intrinsic properties. It then explores the role of piezoelectric potential in charge carrier dynamics and catalytic activity, followed by strategic design approaches to optimize efficiency in environmental remediation and energy conversion. Finally, the review addresses current challenges and future research directions aimed at advancing sustainable solutions using KNN-based materials in these applications. © The Royal Society of Chemistry 2025. | Park, Seonhwa; Jeong, Hui Yong; Kim, Seokhwan; Peddigari, Mahesh; Hwang, Geon-Tae; Moon, Geon Dae; Roh, Jong Wook; Min, Yuho | Regional Leading Research Center for Smart Energy System, Kyungpook National University, Daegu, 41566, South Korea; Regional Leading Research Center for Smart Energy System, Kyungpook National University, Daegu, 41566, South Korea, Department of Materials Science and Metallurgical Engineering, Kyungpook National University, Daegu, 41566, South Korea, Innovative Semiconductor Education and Research Center for Future Mobility, Kyungpook National University, Daegu, 41566, South Korea, Research Institute of Automotive Parts and Materials, Kyungpook National University, 80 Daehakro, Buk-gu, Daegu, South Korea; Regional Leading Research Center for Smart Energy System, Kyungpook National University, Daegu, 41566, South Korea, Department of Materials Science and Metallurgical Engineering, Kyungpook National University, Daegu, 41566, South Korea, Innovative Semiconductor Education and Research Center for Future Mobility, Kyungpook National University, Daegu, 41566, South Korea, Research Institute of Automotive Parts and Materials, Kyungpook National University, 80 Daehakro, Buk-gu, Daegu, South Korea; Department of Physics, Indian Institute of Technology Hyderabad, Telangana, Kandi, 502284, India; Department of Materials Science and Engineering, Pukyong National University, Busan, 48513, South Korea; Dongnam Regional Division, Korea Institute of Industrial Technology, Busan, 46938, South Korea; Regional Leading Research Center for Smart Energy System, Kyungpook National University, Daegu, 41566, South Korea, School of Nano and Materials Science and Engineering, Kyungpook National University, Sangju, 37224, South Korea; Regional Leading Research Center for Smart Energy System, Kyungpook National University, Daegu, 41566, South Korea, Department of Materials Science and Metallurgical Engineering, Kyungpook National University, Daegu, 41566, South Korea, Innovative Semiconductor Education and Research Center for Future Mobility, Kyungpook National University, Daegu, 41566, South Korea, Research Institute of Automotive Parts and Materials, Kyungpook National University, 80 Daehakro, Buk-gu, Daegu, South Korea | 58437403700; 59483124200; 59482653800; 56316365700; 36704574900; 23489708500; 25638796100; 36782804100 | jw.roh@knu.ac.kr;yuhomin@knu.ac.kr; | Nanoscale | NANOSCALE | 2040-3364 | 2040-3372 | 17 | 6 | SCIE | CHEMISTRY, MULTIDISCIPLINARY;MATERIALS SCIENCE, MULTIDISCIPLINARY;NANOSCIENCE & NANOTECHNOLOGY;PHYSICS, APPLIED | 2024 | 5.1 | 23.8 | 0.12 | 2025-05-07 | 2 | Carrier transport; Chemical modification; Crystal defects; Design for testability; Doping (additives); Ecodesign; Energy conservation; Environmental design; Environmental remediation; Halogen compounds; Layered semiconductors; Nitrogen compounds; Phosphorus compounds; Photocatalysis; Piezoelectric materials; Piezoelectricity; Selenium compounds; Solar power generation; Strategic materials; Sustainable development; Temperature scales; Thermal Engineering; Water resources; Wide band gap semiconductors; perovskite; potassium; sodium; Crystals structures; Electronic energies; Energy conversion and storages; Mechanical and electrical; Pb-free; Performance; Piezoelectric; Piezoelectric potential; Potassium sodium niobate; Strategic design; absorption; catalysis; chemical composition; crystal structure; drug development; ecosystem restoration; electric potential; electron; electronics; energy conversion; genetic recombination; pharmaceutics; review; semiconductor; therapy; thermostability; Perovskite | English | Final | 2024 | 10.1039/d4nr04415k | 바로가기 | 바로가기 | 바로가기 | ||||||||
| ○ | ○ | Article | Synergistic effect of ROS-generating polydopamine on drug-induced bone tissue regeneration | A PHD (prolyl hydroxylase) inhibitor, 1,4-dihydrophenonthrolin-4-one-3-carboxylic acid (1,4-DPCA), is a drug that can artificially promote tissue regeneration by enhancing metabolic activity through the upregulation of hypoxia inducible factor 1 subunit alpha (Hif-1 alpha) under normoxic conditions. This study presents a novel design methodology for a drug delivery system to maximize the regenerative effect of 1,4-DPCA. Specifically, by encapsulating 1,4-DPCA in polydopamine (PDA) that generates reactive oxygen species (ROS), the combined effects of Hif-1 alpha upregulation and the induction of cellular antioxidant defense mechanisms by localized ROS can significantly enhance tissue regeneration. The study confirmed that each material (PDA and 1,4-DPCA) triggers a positive synergistic effect on the regenerative mechanisms. As a result, the use of a PDA drug delivery system loaded with 1,4-DPCA showed approximately six times greater bone regeneration compared to the control (no treatment) in a mouse calvarial defect model. The combination of PDA NPs and 1,4-DPCA leads to a synergistic effect that enhances bone tissue regeneration in vivo. | Han, Hyeju; Kang, Bongkyun; Sharker, Shazid Md.; Kashem, Tabassum Binte; Kim, Yuejin; Lee, Jeehee; Park, Minok; Kim, Eunjeong; Jung, YunJae; Lim, Jinkyu; Ryu, Seungwon; Lee, Kyueui | Kyungpook Natl Univ, Dept Chem, Daegu 41566, South Korea; Kyungpook Natl Univ, KNU Inst Basic Sci, Daegu 41566, South Korea; Kyungpook Natl Univ, KNU G LAMP Project Grp, Daegu 41566, South Korea; North South Univ, Dept Pharmaceut Sci, Dhaka 1229, Bangladesh; Stanford Univ, Dept Orthopaed Surg, Sch Med, Stanford, CA 94305 USA; Lawrence Berkeley Natl Lab, Energy Technol Area, Berkeley, CA 94720 USA; Kyungpook Natl Univ, BK21 FOUR KNU Creat BioRes Grp, Coll Nat Sci, Dept Biol, Daegu 41566, South Korea; Gachon Univ, Coll Med, Dept Microbiol, Incheon 21999, South Korea; Catholic Univ Korea, Dept Energy & Environm Engn, Bucheon 14662, South Korea; Kyungpook Natl Univ Hosp, Biomed Res Inst, Daegu 41940, South Korea | Lee, Hyunjoo/G-8034-2012; Lee, Kyueui/ACR-8902-2022; Sharker, Shazid/S-6210-2019 | 57561260500; 59308890800; 57210229996; 59295770600; 57966884600; 57196138995; 57212683444; 56892981600; 23481503600; 57188990370; 57198781254; 56404800600 | kyueui@knu.ac.kr; | NANOSCALE | NANOSCALE | 2040-3364 | 2040-3372 | 16 | 43 | SCIE | CHEMISTRY, MULTIDISCIPLINARY;MATERIALS SCIENCE, MULTIDISCIPLINARY;NANOSCIENCE & NANOTECHNOLOGY;PHYSICS, APPLIED | 2024 | 5.1 | 23.8 | 0.29 | 2025-05-07 | 2 | 2 | RESPONSES; SYSTEM; MODEL; NRF2; MICE | Animals; Bone Regeneration; Drug Delivery Systems; Hypoxia-Inducible Factor 1, alpha Subunit; Indoles; Mice; Polymers; Prolyl-Hydroxylase Inhibitors; Reactive Oxygen Species; Skull; Controlled drug delivery; Targeted drug delivery; Tissue regeneration; Hif1a protein, mouse; hypoxia inducible factor 1alpha; indole derivative; polydopamine; polymer; prolyl hydroxylase inhibitor; reactive oxygen metabolite; Bone tissue regeneration; Drug-delivery systems; HIF-1α; Hypoxia-inducible factor 1; Metabolic activity; Polydopamine; Prolyl hydroxylase; Reactive oxygen species; Synergistic effect; Up-regulation; animal; bone regeneration; chemistry; drug delivery system; drug effect; injury; metabolism; mouse; pathology; skull; Bone | English | 2024 | 2024-11-07 | 10.1039/d4nr02887b | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |||
| ○ | ○ | Article | Triphenylphosphonium-functionalized dimeric BODIPY-based nanoparticles for mitochondria-targeting photodynamic therapy | The dimerization of boron dipyrromethene (BODIPY) moieties is an appealing molecular design approach for developing heavy-atom-free triplet photosensitizers (PSs). However, BODIPY dimer-based PSs generally lack target specificity, which limits their clinical use for photodynamic therapy. This study reports the synthesis of two mitochondria-targeting triphenylphosphonium (TPP)-functionalized meso-beta directly linked BODIPY dimers (BTPP and BeTPP). Both BODIPY dimers exhibited solvent-polarity-dependent singlet oxygen (1O2) quantum yields, with maximum values of 0.84 and 0.55 for BTPP and BeTPP, respectively, in tetrahydrofuran. The compact orthogonal geometry of the BODIPY dimers facilitated the generation of triplet excited states via photoinduced charge separation (CS) and subsequent spin-orbit charge-transfer intersystem crossing (SOCT-ISC) processes and their rates were dependent on the energetic configuration between the frontier molecular orbitals of the two BODIPY subunits. The as-synthesized compounds were amphiphilic and hence formed stable nanoparticles (similar to 36 nm in diameter) in aqueous solutions, with a zeta potential of similar to 33 mV beneficial for mitochondrial targeting. In vitro experiments with MCF-7 and HeLa cancer cells indicated the effective localization of BTPP and BeTPP within cancer-cell mitochondria. Under light irradiation, BTPP and BeTPP exhibited robust photo-induced therapeutic effects in both cell lines, with half-maximal inhibitory concentration (IC50) values of similar to 30 and similar to 55 nM, respectively. This study reports the synthesis, characterization, and photodynamic therapy activity of two orthogonal BODIPY dimers functionalized with TPP cations for mitochondrial targeting. | Kim, Chanwoo; Mai, Duy Khuong; Lee, Joomin; Jo, Jinwoong; Kim, Soyeon; Badon, Isabel Wen; Lim, Jong Min; Kim, Ho-Joong; Yang, Jaesung | Yonsei Univ, Dept Chem, Wonju 26493, Gangwon, South Korea; Chosun Univ, Dept Chem, Gwangju 61452, South Korea; Chosun Univ, Dept Food & Nutr, Gwangju 61452, South Korea; Chung Ang Univ, Dept Life Sci, Seoul 06974, South Korea; Kyungpook Natl Univ, Dept Chem, Daegu 41566, South Korea | 57454569000; 57210377167; 13405978600; 58863248800; 36113909100; 57202727336; 55230588200; 57157852700; 23399222400 | jongmin@knu.ac.kr;hjkim@chosun.ac.kr;jaesung.yang@yonsei.ac.kr; | NANOSCALE | NANOSCALE | 2040-3364 | 2040-3372 | 16 | 19 | SCIE | CHEMISTRY, MULTIDISCIPLINARY;MATERIALS SCIENCE, MULTIDISCIPLINARY;NANOSCIENCE & NANOTECHNOLOGY;PHYSICS, APPLIED | 2024 | 5.1 | 23.8 | 1.16 | 2025-05-07 | 5 | 4 | EXCITED TRIPLET-STATE; SINGLET OXYGEN GENERATION; HALOGEN-FREE PHOTOSENSITIZERS; HIGHLY EFFICIENT; FLUORESCENCE; DERIVATIVES; MODULATION; BISBODIPY; STRATEGY; ABILITY | Boron Compounds; Cell Survival; Dimerization; HeLa Cells; Humans; MCF-7 Cells; Mitochondria; Nanoparticles; Organophosphorus Compounds; Photochemotherapy; Photosensitizing Agents; Singlet Oxygen; Cancer cells; Cell culture; Charge transfer; Diseases; Excited states; Lanthanum compounds; Mitochondria; Molecular orbitals; Nanoparticles; Photodynamic therapy; Photosensitizers; Solvents; Synthesis (chemical); 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene; boron derivative; nanoparticle; organophosphorus compound; photosensitizing agent; singlet oxygen; triphenylphosphonium; Boron dipyrromethene; Cancer cells; Design approaches; Dimerizations; Dipyrromethene; Functionalized; Heavy atoms; Mitochondrias; Molecular design; Triplet photosensitizers; cell survival; chemistry; dimerization; drug effect; HeLa cell line; human; MCF-7 cell line; metabolism; mitochondrion; photochemotherapy; Dimers | English | 2024 | 2024-05-16 | 10.1039/d4nr00694a | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||||
| ○ | ○ | Article | Curing Kinetics of Ultrahigh-Temperature Thermosetting Polyimides Based on Phenylethynyl-Terminated Imide Oligomers with Different Backbone Conformations | A series of phenylethynyl-terminated imide (PETI) oligomers with varying chemical backbones and calculated number-average molecular weights were successfully synthesized via chemical imidization. These PETI oligomers exhibited exceptional solubility (>50 wt %) in both the high-boiling-point solvent N-methyl-2-pyrrolidinone (NMP) and low-boiling-point solvents tetrahydrofuran (THF) and 1,4-dioxane (dioxane). The curing reactivities of the PETI oligomers were assessed based on the dianhydride structure using a nonisothermal differential scanning calorimetry (DSC) method. Kinetic parameters, including the preexponential factor (A), activation energy (E-a), reaction order (n), and reaction rate constant (k), were determined using Kissinger, Ozawa, Crane, and Arrhenius equations. All PETI oligomers followed a first-order kinetic reaction model below 90% conversion. The curing process was characterized by two distinct stages: initiation and propagation. PETI oligomers containing electron-donating linkages (-O-) exhibited the lowest curing reactivity. In contrast, despite its slower initiation, the PETI oligomer containing electron-withdrawing groups (-CF3) exhibited the highest curing reactivity. Thermally cured resin derived from 2,3,3 ',4 '-biphenyltetracarboxylic dianhydride and 2,2 '-bis(trifluoromethyl)benzidine is expected to exhibit excellent processability and thermal stability due to their high solubility, relatively low T-m (237.4-263.1 degrees C), and remarkable T-d5% of 595.3 degrees C. This study provides a comprehensive understanding of the properties of PETI oligomers, enabling informed material selection for high-performance resin-based composite applications. | Kim, Minju; Khim, Seongjun; Lee, Joon Hyuk; Jeon, Eunkyung; Song, Jungkun; Choi, Jaeho; Yeo, Hyeonuk; Nam, Ki-Ho | Kyungpook Natl Univ, Dept Text Syst Engn, Daegu 41566, South Korea; Agcy Def Dev, Daejeon 34186, South Korea; Kyungpook Natl Univ, Dept Chem Educ, Daegu 41566, South Korea; Kyungpook Natl Univ, Sch Appl Chem Engn, Daegu 41566, South Korea | Lee, Joon Hyuk/AAS-1755-2020; Yeo, Hyeonuk/AHE-0397-2022; yeo, hyeonuk/G-7890-2017 | 57203466947; 58024968200; 57201905002; 57204466122; 57204465785; 55722492000; 55324816500; 55553181500 | knam@knu.ac.kr; | ACS APPLIED POLYMER MATERIALS | ACS APPL POLYM MATER | 2637-6105 | 6 | 21 | SCIE | MATERIALS SCIENCE, MULTIDISCIPLINARY;POLYMER SCIENCE | 2024 | 4.7 | 23.9 | 0 | 2025-05-07 | 0 | 0 | thermosetting polyimides; phenylethynyl-terminated imide; fiber-reinforced plastic; curing kinetics; processability; thermal durability; structure parameters | MOLECULAR-WEIGHT; MECHANICAL-PROPERTIES; CROSS-LINKING; COMPOSITES; DIANHYDRIDE; MATRIX; CRYSTALLIZATION; IMIDIZATION; ADHESIVE; CURE | curing kinetics; fiber-reinforced plastic; phenylethynyl-terminated imide; processability; structure parameters; thermal durability; thermosetting polyimides | Boiling point; Curing; Elastomers; Fiber reinforced plastics; Oligomers; Polyimides; Rate constants; Thermosets; Curing kinetics; Curing reactivity; Dianhydrides; Fibre-reinforced; Phenylethynyl terminated imides; Processability; Structure parameter; Thermal durability; Thermosetting polyimides; Ultrahigh temperature; Activation energy | English | 2024 | 2024-10-21 | 10.1021/acsapm.4c02851 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Dependence of Thermal Conductivity and Reprocessability on the Polymerization System for Liquid Crystalline Epoxy Vitrimers | The rapid advancement of compact, high-performance electrical devices increases internal heat accumulation, which harms their functionality and lifespan. One promising approach involves developing thermoset resins with intrinsically high thermal conductivity (TC), such as liquid crystalline epoxy resins (LCERs) with well-aligned mesogens, which exhibit high TC due to enhanced phonon transmittance. Still, traditional LCERs are not reprocessable, posing environmental problems. On the contrary, liquid crystalline epoxy vitrimers (LCEVs) with dynamic covalent bonds allow reprocessability via exchange reactions. Although typical vitrimers are praised for their remarkable properties, their conventional reprocessing, which involves transesterification, often necessitates the use of toxic external catalysts, causing instability in the material and promoting corrosion. Here, we demonstrate a series of catalyst-free LCEV systems based on LCEV monomers cured by cationic and anionic initiators to enhance functionality. The final products show high TC (similar to 0.67 W m-1 K-1), tripling that of traditional epoxy resin (similar to 0.2 W m-1 K-1), while also demonstrating excellent mechanical properties. Furthermore, the LCEVs display superior reprocessability using simple heating and compression, obviating the need for external catalysts. Importantly, these materials retain their properties even after several reprocessing cycles, with slight mechanical property reductions. These advancements hold promise for high-performance, eco-friendly material development for use in electrical devices. | Trinh, Thi En; Ku, Kyosun; Yeo, Hyeonuk | Kyungpook Natl Univ, Dept Sci Educ, Daegu 41566, South Korea; Kyungpook Natl Univ, Adv Inst Water Ind, Daegu 41566, South Korea; Kyungpook Natl Univ, Dept Chem Educ, Daegu 41566, South Korea; Kyungpook Natl Univ, Sch Appl Chem Engn, Daegu 41566, South Korea | Yeo, Hyeonuk/AHE-0397-2022; yeo, hyeonuk/G-7890-2017 | 58092720700; 57219781815; 55324816500 | yeo@knu.ac.kr; | ACS APPLIED POLYMER MATERIALS | ACS APPL POLYM MATER | 2637-6105 | 6 | 21 | SCIE | MATERIALS SCIENCE, MULTIDISCIPLINARY;POLYMER SCIENCE | 2024 | 4.7 | 23.9 | 0.74 | 2025-05-07 | 2 | 2 | epoxy resins; liquid crystals; reprocessing; thermal conductivity; vitrimers | 4,4'-DIGLYCIDYLOXYBIPHENYL EPOXY; CURING KINETICS; RESIN; CHEMISTRY; DRIVEN | epoxy resins; liquid crystals; reprocessing; thermal conductivity; vitrimers | Computer resource management; Liquid crystal displays; Metamorphic rocks; Nanocrystalline alloys; Signal receivers; Epoxy; High thermal conductivity; Liquid crystalline epoxy; Liquid-crystals; Performance; Property; Reprocessability; Reprocessing; Thermal; Vitrimer; Liquid crystals | English | 2024 | 2024-10-29 | 10.1021/acsapm.4c02370 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Directing the uniform and dense Li deposition via graphene-enhanced separators for high-stability Li metal batteries | Lithium (Li) has been widely studied as a next-generation anode material owing to its high theoretical capacity (3860 mAh g(-1)) and lowest negative potential (-3.04 V vs. SHE). However, the practical applications of Li-metal batteries (LMBs) are hindered by uncontrolled Li deposition during the charging/discharging process and low Coulombic efficiency. Among the numerous strategies, surface optimization of polymer separators with functional nanomaterials, especially graphene, has achieved significant progress in both academic and industrial fields. In this study, we elucidate how the graphene-enhanced separator (GES) improves the electrochemical reversibility of Li deposition/dissolution and consequently extends the cyclability of LMBs. When the GES is employed in Li|Cu cells, a dense Li layer forms between the graphene layer and Cu current collector after multiple Li deposition/dissolution cycles. Furthermore, when the graphene-modified current collector (GMCC) is employed, Li dendrites predominantly grow on the graphene surface and migrate toward the separator, alleviating the risk of separator puncture. The Li|Cu cell with GES demonstrates a higher cycle stability and Coulombic efficiency under high current conditions (similar to 99 % at 4 mA cm (-2)) than the Li|Cu and Li|GMCC cells. Moreover, anode-free cells paired with the GES exhibited high capacities and consistent cycle performances under both lowand high-current conditions. | Park, Minsu; Woo, Sujeong; Seo, Jihoon; Choi, Junghyun; Jeong, Euigyung; Kim, Patrick Joohyun | Kyungpook Natl Univ, Dept Appl Chem, Daegu 41566, South Korea; Clarkson Univ, Dept Chem & Biomol Engn, Potsdam, NY USA; Gachon Univ, Sch Chem Biol & Battery Engn, Seongnam 13120, South Korea; Kyungpook Natl Univ, Dept Text Syst Engn, Daegu 41566, South Korea | Seo, Jihoon/ABI-6972-2020 | 57402583800; 59137762800; 55821491100; 59883103900; 35885596300; 57195611779 | junghchoi@gachon.ac.kr;wolfpack@knu.ac.kr;pjkim@knu.ac.kr; | ELECTROCHIMICA ACTA | ELECTROCHIM ACTA | 0013-4686 | 1873-3859 | 495 | SCIE | ELECTROCHEMISTRY | 2024 | 5.6 | 23.9 | 0.84 | 2025-05-07 | 4 | 3 | Graphene-enhanced separator; Li dendrite growth direction control; Dense Li layer; Li-metal batteries; Anode-free batteries | LITHIUM-ION BATTERIES; LAYER; ANODE; CHALLENGES; EMISSIONS | Anode-free batteries; Dense Li layer; Graphene-enhanced separator; Li dendrite growth direction control; Li-metal batteries | Anodes; Cells; Charging (batteries); Cytology; Deposition; Efficiency; Electric current collectors; Lithium; Lithium batteries; Separators; Anode-free battery; Dendrite growth; Dense lithium layer; Direction control; Graphene-enhanced separator; Growth directions; Lithium dendrite; Lithium dendrite growth direction control; Lithium metals; Lithium-metal battery; Graphene | English | 2024 | 2024-08-10 | 10.1016/j.electacta.2024.144426 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Effect of Flexible Chains on Thermal Conductivity of Liquid Crystalline Epoxy Resins | Liquid crystalline epoxy resins (LCEs) have attracted scientific attention due to their excellent physical properties, including thermal conductivity. In this study, we report biphenyl epoxy resins (BPERn)-a series of LCEs-and their intermolecular interaction depending on the network structure. Biphenyl derivatives of the liquid crystalline monomers were synthesized by introducing various lengths of alkyl chains and epoxy functional groups at both ends of side monomers and exhibited a mesomorphic orientation in the specific temperature range. The BPERn were prepared by hot compression molding, employing hexamethylene diamine as a curing agent. The curing behavior was monitored by polarizing optical microscopy and differential scanning calorimetry. The formation of an LC orientation was observed during the polymerization process. The thermal properties were optimized by using thermogravimetric analysis, differential scanning calorimetry, dynamic mechanical analysis, and thermal conductivity measurements. The microstructure was optimized by X-ray scattering analysis. The thermal conductivity of the BPERn increased with the flexible chain length, and BPER8 with the longest alkyl chain reached 0.50 W/m.K. The bulk specimens of BPERn exhibited a faster temperature change than conventional commercial samples when observed by an infrared thermal imaging camera. These results suggest improvement in the thermal conductivity of the LCE suitable for application in electronic materials. | Ku, Kyosun; Yeo, Hyeonuk | Kyungpook Natl Univ, Adv Inst Water Ind, Daegu 41566, South Korea; Kyungpook Natl Univ, Dept Chem Educ, Daegu 41566, South Korea; Kyungpook Natl Univ, Sch Appl Chem Engn, Daegu 41566, South Korea | yeo, hyeonuk/G-7890-2017; Yeo, Hyeonuk/AHE-0397-2022 | 57219781815; 55324816500 | yeo@knu.ac.kr; | ACS APPLIED POLYMER MATERIALS | ACS APPL POLYM MATER | 2637-6105 | 6 | 21 | SCIE | MATERIALS SCIENCE, MULTIDISCIPLINARY;POLYMER SCIENCE | 2024 | 4.7 | 23.9 | 1.12 | 2025-05-07 | 4 | 4 | thermosetting resin; liquid crystalline epoxy resin; flexible chain; molecular interaction; orientation; thermal conductivity | CURING KINETICS; 4,4'-DIGLYCIDYLOXYBIPHENYL EPOXY | flexible chain; liquid crystalline epoxy resin; molecular interaction; orientation; thermal conductivity; thermosetting resin | Chain length; Crystal orientation; Elastomers; Epoxy resins; Molecular orientation; Thermography (imaging); Thermosets; Biphenyl derivatives; Epoxy; Flexible chains; Intermolecular interactions; Liquid crystalline epoxy resins; Network structures; Orientation; Property; Scanning calorimetry; Thermal; Compression molding | English | 2024 | 2024-10-18 | 10.1021/acsapm.4c02957 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Electrochemical characteristics of flexible open-cell supercapacitors employing different electrolyte types: KOH and ionic liquid | A carbonate hydroxide compound with substantial wettability was deposited on a porous Ni foam substrate, employing the Ni-based chemical precursor by a facile hydrothermal method. The resulting Ni 2 (CO 3 )(OH) 2 electrode exhibits a nanowire structure characterized by a significant surface area. These electrodes represent highly promising materials for faradaic capacitors. They demonstrate high wettability on the electrode surface, facilitating charge and discharge processes on the electrode surface through redox reactions. A flexible hybrid open -cell supercapacitor, designed to operate at 1.5 V, was constructed with the Ni 2 (CO 3 )(OH) 2 electrode as the positive terminal and graphene as the negative terminal, employing two distinct electrolytes (KOH and ionic liquid named MPPyFSI with 1-Methyl-1-propylpyrrolidinium Bis(fluorosulfonyl)imide structure). The open -cell devices, fabricated with 6 M KOH and MPPyFSI electrolyte, exhibit high energy densities of 39.6 and 24.8 Wh kg -1 and power densities of 1752.1 and 2908.5 W kg -1 at current densities of 2 A g -1 , respectively. Furthermore, the energy storage devices utilizing aqueous KOH and MPPyFSI demonstrate excellent stability, maintaining 73.4 and 87.1% of their specific capacity after 5,000 charge/discharge cycles. The mechanical properties of the flexible open -cell device were characterized, and the electrochemical values corresponding to the banding angle of the device were measured. | Lee, Damin; Keppetipola, Nilanka M.; Roh, Jong Wook; Kim, Dong Hwan; Cojocaru, Ludmila; Kim, Jeongmin; Toupance, Thierry | DGIST, Div Nanotechnol, 333 Techno Jungang Daero, Daegu 42988, South Korea; Kyungpook Natl Univ, Reg Leading Res Ctr Smart Energy Syst, Daegu 41566, South Korea; Univ Bordeaux, CNRS, Bordeaux INP, ISM,CNRS,ISM,Grp Chim Mol & Mat C2M, 351 Cours Liberat, F-33607 Talence, France; Coll France, CSE, UMR 8260, F-75231 Paris 05, France; Komaba Inst Sci KIS, Grad Sch Arts & Sci, 4-6-1 Komaba, Meguro, Tokyo 1538904, Japan | Cojocaru, Ludmila/HKV-3402-2023; TOUPANCE, Thierry/O-3368-2018 | 57194601076; 57221673990; 25638796100; 57195540717; 36500685000; 57203325094; 6701783693 | damin91@knu.ac.kr;thierry.toupance@u-bordeaux.fr; | ELECTROCHIMICA ACTA | ELECTROCHIM ACTA | 0013-4686 | 1873-3859 | 497 | SCIE | ELECTROCHEMISTRY | 2024 | 5.6 | 23.9 | 1.68 | 2025-05-07 | 4 | 6 | Ni2(CO3)(OH)2 nanostructure; KOH electrolyte; MPPyFSI ionic liquid; Faradaic capacitors; Supercapacitors | PERFORMANCE; NICKEL; NANOSHEET; HYDROXIDE; CARBON | Faradaic capacitors; KOH electrolyte; MPPyFSI ionic liquid; Ni<sub>2</sub>(CO<sub>3</sub>)(OH)<sub>2</sub> nanostructure; Supercapacitors | Biomechanics; Electric discharges; Electrodes; Electrolytes; Electrolytic capacitors; Ionic liquids; Potassium hydroxide; Redox reactions; Surface reactions; Wetting; Electrochemical characteristics; Electrode surfaces; Faradaic capacitor; Foam substrates; KOH electrolyte; MPPyFSI ionic liquid; Ni foam; Ni2(CO3)(OH)2 nanostructure; Open-cell; Porous Ni; Supercapacitor | English | 2024 | 2024-09-01 | 10.1016/j.electacta.2024.144513 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Enhancing ToF-SIMS OLED Data Analysis with Neural Networks and Mathematical Spectral Mixing | This study presents a method employing artificial neural networks (ANN) for automated interpretation and depth profiling of organic multilayers using a limited set of time-of-flight secondary ion mass spectrometry (ToF-SIMS) spectra. To overcome the challenges of acquiring massive data sets for OLEDs, training data was generated by combining existing ToF-SIMS data sets with mathematically generated spectra. The classification model achieved an impressive 99.9% accuracy in identifying the mixed layers of the OLED dyes. The study demonstrates the synergy of ToF-SIMS and ANN analysis for effective classification and depth profiling of the OLED layers, providing valuable insights for the development and optimization of organic electronic devices. | Son, Seungwoo; Baek, Ji Young; Choi, Chang Min; Choi, Myoung Choul; Kim, Sunghwan | Kyungpook Natl Univ, Dept Chem Educ, Daegu 41566, South Korea; Korea Basic Sci Inst, Ctr Sci Instrumentat, Ochang Ctr, Chungbuk 28119, South Korea; Mass Spectrometry Convergence Res Ctr, Daegu 41566, South Korea; Green Nano Mat Res Ctr, Daegu 41566, South Korea | ; Choi, Chang Min/HPE-9467-2023; Kim, Sunghwan/HKN-9812-2023 | 57206473214; 57203101627; 57199857902; 25633658300; 57203772967 | cmc@kbsi.re.kr;sunghwank@knu.ac.kr; | JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY | J AM SOC MASS SPECTR | 1044-0305 | 1879-1123 | 35 | 7 | SCIE | BIOCHEMICAL RESEARCH METHODS;CHEMISTRY, ANALYTICAL;CHEMISTRY, PHYSICAL;SPECTROSCOPY | 2024 | 2.7 | 23.9 | 0 | 2025-05-07 | 0 | 0 | LIGHT-EMITTING-DIODES; XPS | Multilayer neural networks; Multilayers; Organic light emitting diodes (OLED); Organic polymers; Secondary ion mass spectrometry; dye; Automated interpretation; Data set; Mass spectrometry data; Massive data sets; Neural-networks; Organic multilayers; Spectra's; Spectral mixing; Time of flight secondary ion mass spectrometry; Training data; accuracy; Article; artificial neural network; back propagation; cell structure; classification; controlled study; data analysis; secondary ion mass spectrometry; time of flight mass spectrometry; article; artificial neural network; electronic device; nerve cell network; Depth profiling | English | 2024 | 2024-05-31 | 10.1021/jasms.4c00158 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |||
| ○ | ○ | Article | Fluorescent Polyimide Films with Covalently Incorporated Perylenediimide | Fluorescent polyimide films were manufactured using colorless, transparent polyimide (PI) as a matrix material and perylenediimide (PDI) as a covalently incorporated fluorophore. The matrix polymer was manufactured using fluorinated monomers of 4,4 '-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 2,2-bis(trifluoromethyl)benzidine. A slight excess of 6FDA was used to produce an acid anhydride-terminated polyamic acid (PAA) precursor. Amine-terminated PDI was prepared in advance through a high-temperature condensation reaction between perylene-3,4,9,10-tetracarboxylic acid dianhydride and two equivalent cycloaliphatic diamines. The acid anhydride-terminated precursor PAA was treated with the amine-terminated PDI to simultaneously extend the chain and confer fluorescence (FL), followed by chemical imidization to obtain fluorescent PIs. Well-featured PI films with a thickness of approximately 50 mu m were fabricated via casting on glass slides and convection drying. The prepared PI films showed an elastic modulus of more than 4.4 GPa, a tensile strength of more than 81 MPa, a thermal decomposition temperature of more than 500 degrees C, at which a weight loss of 5% was observed, and a glass transition temperature of more than 306 degrees C. Moreover, the polymer films showed FL quantum efficiency of 5.74% or higher, with the FL color slightly differing depending on the cycloaliphatic diamine used in the synthesis of the PDI unit. | Kim, Heesang; Kwak, Giseop | Kyungpook Natl Univ, Dept Polymer Sci & Engn, Polymer Nanomat Lab, Daegu 702701, South Korea | , Giseop/M-8370-2018 | 57226091356; 17137322300 | gkwak@knu.ac.kr; | ACS APPLIED POLYMER MATERIALS | ACS APPL POLYM MATER | 2637-6105 | 6 | 12 | SCIE | MATERIALS SCIENCE, MULTIDISCIPLINARY;POLYMER SCIENCE | 2024 | 4.7 | 23.9 | 0.37 | 2025-05-07 | 2 | 2 | polyimide; perylenediimide; chemical imidization; high-temperature condensation; fluorescence; vibronic transition | INTRAMOLECULAR PROTON-TRANSFER; BRIGHT RED FLUORESCENCE; LARGE STOKES SHIFTS; EXCITED-STATE; FLEXIBLE DISPLAYS; EFFICIENCY; PHOTOLUMINESCENCE; EMISSION; DIIMIDE; DESIGN | chemical imidization; fluorescence; high-temperature condensation; perylenediimide; polyimide; vibronic transition | Amines; Condensation; Condensation reactions; Decomposition; Film preparation; Fluorescence; Glass; Glass transition; Polymer films; Tensile strength; Acid anhydride; Chemical imidization; Cycloaliphatic; High-temperature condensation; Highest temperature; Perylenediimides; Poly amic acids; Polyamic-acid; Polyimide film; Vi-bronic transitions; Polyimides | English | 2024 | 2024-06-13 | 10.1021/acsapm.4c01308 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Low-Voltage Controlled Fast Switchable Liquid-Crystal-Based Reflectarray With Transverse Rubbing Layer | This letter proposes a low-voltage controlled fast beam switchable liquid-crystal-based reflectarray (LC-RA). By introducing a strip array of ground patterns and a transverse rubbing layer, a 1.5 V-powered falling response can be achieved for fast beam switching. Typically, the falling response of the LC cannot be controlled by the bias voltage, leading to slow beam switching. The strip array, in conjunction with the top electrodes, generates lateral fields for arranging the molecules of the LC, enabling the falling nature to be controlled by the bias voltage. In addition, the transverse rubbing layer achieves a low voltage-based fast-falling response without degradation of antenna performance. This study demonstrates the antenna performance and switching speed of the proposed LC-RA and compares it with other LC-based antennas. Finally, the proposed antenna achieves 1.6 s of switching speed with under bias voltage of 5 V for the beamforming. Moreover, the proposed design shows high antenna performance, such as aperture efficiency, SLL, and scanning range, compared to the LC-based antennas at the millimeter-wave (mmWave) band. | Kim, Hogyeom; Lee, Jae-Won; Bang, Seungwoo; Wang, Junkai; Kim, Min-Seok; Kim, Hak-Rin; Oh, Jungsuek | Seoul Natl Univ, Inst New Media & Commun INMC, Seoul 08826, South Korea; Seoul Natl Univ, Dept Elect & Comp Engn, Seoul 08826, South Korea; Kyungpook Natl Univ, Sch Elect Engn, Daegu 41566, South Korea; Kyungpook Natl Univ, Sch Elect & Elect Engn, Daegu 41566, South Korea | Kim, Hak-Rin/T-1897-2019 | 57210172464; 58377059800; 58339180600; 57957421500; 59073001500; 7410124944; 35194285700 | rineey@knu.ac.kr;jungsuek@snu.ac.kr; | IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS | IEEE ANTENN WIREL PR | 1536-1225 | 1548-5757 | 23 | 12 | SCIE | ENGINEERING, ELECTRICAL & ELECTRONIC;TELECOMMUNICATIONS | 2024 | 4.8 | 23.9 | 0.36 | 2025-05-07 | 1 | 1 | Switches; Antennas; Permittivity; Permittivity measurement; Low voltage; Electrodes; Control systems; Fast beam switching; liquid crystals; reconfigurable reflectarray antenna | ANTENNA | Fast beam switching; liquid crystals; reconfigurable reflectarray antenna | Antenna arrays; Bias voltage; Liquid crystals; Scanning antennas; Antenna performance; Fast beam switching; Liquid-crystals; Low voltages; Reconfigurable reflectarray; Reconfigurable reflectarray antenna; Reflectarray antennas; Reflectarrays; Switchable; Voltage-controlled; Electrodes | English | 2024 | 2024-12 | 10.1109/lawp.2024.3438367 | 바로가기 | 바로가기 | 바로가기 | 바로가기 |
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