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Spinel zinc manganate-based high-capacity and high-stability non-aqueous zinc-ion batteries

JOURNAL OF MATERIALS CHEMISTRY A 2023年第46期11卷 25595-25604页

作者： Pathak, Prakash Kumar Kumar, Nitish Ahn, Heejoon Salunkhe, Rahul R. Indian Inst Technol Jammu NH-44PO Nagrota Jammu 181221 J&K India Hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program 222 Wangsimni ro Seoul 04763 South Korea

For aqueous zinc ion batteries (ZIBs), poor cyclability originates from undesired side reactions, leading to dendrite formation and thermodynamic instability. Strategies such as surface modifications of electrodes, utilization of electrolyte additives, and tuning the crystallinity and electronic structure have been previously adopted to prevent such issues. Despite significant research in this area, achieving high efficiency by suppressing dendrite growth and long-term durability is still challenging. In recent years, non-aqueous (NA) electrolyte-based ZIBs have emerged due to their advantages of high voltage window stability, alleviating dendrite formation, and compatibility of high voltage host materials with NA electrolytes. Here, we used an NA electrolyte for a spinel zinc manganate (ZMO) based ZIB. In this work, we have synthesized zinc manganate on carbon cloth (ZMC) via a simple and facile electrodeposition method. The synthesized cathode was assembled with a metallic zinc anode, which exhibited outstanding cycling stability for 1000 cycles with a minimal capacity fading of 12% and almost 100% coulombic efficiency. The ZIB exhibits the highest specific energy (SE) of 632 W h kg-1 and specific power (SP) of 1277 W kg-1. The chemical kinetics of the zinc ion have been probed by studying cyclic voltammetry and discharge curves for the galvanostatic intermittent titration technique (GITT). Furthermore, ex situ investigations were carried out to get details about the charge storage mechanisms during various stages of charge-discharge. These studies underpin the origin of high stability and excellent discharge capacity and bring up-to-date electrochemical reactions within NA ZIBs. We prepared spinel zinc manganate on free-standing carbon cloth using an electrodeposition method. It showed high capacity and stability in a non-aqueous electrolyte for zinc ion batteries.

关键词： Stability

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Nitrogen and Sulfur Co-Doped Carbon Quantum Dot-Engineered TiO₂ Graphene on Carbon Fabric for Photocatalysis Applications

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ACS APPLIED NANO MATERIALS 2023年第17期6卷 15782-15794页

作者： Ambade, Rohan B. Ali, Mumtaz Lee, Ki Hyun Jeong, Woojae Jeong, Sung Hoon Han, Tae Hee Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea Natl Text Univ Sch Engn & Technol Dept Text Engn Faisalabad 37610 Pakistan

Carbon quantum dots (CQDs) have gained considerable attention owing to their unique optoelectronic properties. However, these properties are quenched upon the aggregation of CQDs in solid-state devices, limiting their practical applications. Herein, we developed nitrogen and sulfur co-doped CQDs (NS-CQDs) by in situ carbonization process and were doped in TiO2-rGO (NS-CQDs-rGO-TiO2) nanocomposites on flexible carbon fabric substrate for efficient solid-state photocatalytic activity. The NS-CQDs-rGO-TiO2 photocatalyst decorated on flexible carbon fabric substrate facilitates recycling and thus improves the cycle life. The NS-CQD-rGO-TiO2 nanocomposites exhibited improved photocatalytic degradation of 98% toward organic pollutants (methylene blue dye) than conventional aggregation-induced quenching of N-doped CQDs-rGO-TiO2 (67%) under the same conditions. The enhanced photocatalytic activity of NS-CQD-rGO-TiO2 nanocomposites is ascribed to NS co-doping, ultrasmall nanoparticle morphology, mesoporous structure, high surface area, modified bandgap, the resulting mixed-phase TiO2, and formation of direct Z-scheme electron transfer under ultraviolet (UV) irradiation. Thus, this work provides insights into developing composite materials based on rutile TiO2 for photocatalytic environmental remediation.

关键词： rutile TiO2 NS-co-doped carbon quantum dots carbon fabric mesoporous photocatalyst methylene blue dye

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Comparison of three-dimensional printed composite fabrics with different surface textures made with digital light processing and fused deposition modeling

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JOURNAL OF INDUSTRIAL TEXTILES 2023年 53卷

作者： Li, Yongwei Sun, Jingzhe Bae, Jihyun Hanyang Univ Dept Clothing & Text Human Tech Convergence Program Seoul South Korea Hanyang Univ Dept Clothing & Text Human Tech Convergence Program 222 Wangsimni Ro Seoul South Korea

There is increasing interest in the development of functional composite materials in the field of textiles/clothing, and 3D printing technology has been researched widely to allow practical applications. Previous studies have proposed solutions to improve the adhesion of composite fabrics produced by fused deposition modeling (FDM) technology, but analysis of the adhesion characteristics of fabric composites manufactured by digital light processing (DLP) is insufficient. In this study, the DLP method was used to print rectangular patterns on four textured fabrics (woven polyester (PET), Velour, Fleece, Pleated), peeling experiments and mechanical property tests were conducted on 3D-printed composite fabrics, and these results were compared with those of the FDM method to analyze adhesion based on the surface properties of the fabrics. For composite fabrics printed using the DLP method, a liquid photosensitive resin penetrates the fibers, resulting in greater adhesion of composite fabrics and accuracy of printed patterns than those prepared using FDM. The DLP-PET showed the best mechanical properties in all groups. This research verified that adhesion can be improved by the 3D printing method and the surface characteristics of the fabric and presents a new method to prepare composite fabrics with improved properties.

关键词： composite fabrics Three-dimensional printing Digital light processing fused deposition modeling Adhesive Surface textures fabrics

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Evaluation method for microscale mechanical properties of an epoxy resin

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POLYMER TESTING 2024年 135卷

作者： Kim, Eonji Yun, Hwanhui Lee, Jinhee Lee, Wang-Eun Heo, Kyuyoung Jung, In Hwan Song, In Young Korea Res Inst Chem Technol Reliabil Assessment Ctr Daejeon 34114 South Korea Hanyang Univ Dept Organ & Nano Engn 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea

This study offers a detailed quantitative evaluation of microscale properties of polymers utilizing the surface and interfacial cutting analysis system (SAICAS) technique. The investigation focuses on the formation of the primary shear zone (PSZ) during cutting, leading to plastic deformation and subsequent chip curling. This research explores various cutting thicknesses, each demonstrating unique chip formation, and applies a lubricant to mitigate friction noise and stabilize chip formation. An in-depth analysis of force geometries is performed to gain insights into chip formation. The shear strength and shear viscosity are calculated using relevant equations, thus enabling the quantitative characterization of the viscoelastic behavior of polymers. Remarkably, the polymers exhibit shear thinning behavior, where their resistance to shear decreases as the shear rate increases. The shear viscosity-shear rate plot follows the Ostwald-de Waele relationship, indicative of plastic flow behavior. The viscoelastic characteristics were validated by comparing the values calculated based on Atkins's theory with the quantified values. Then, the physical meaning of those values were discussed. This study facilitates the direct measurement of mechanical properties in solidified form of the polymer, offering a more precise representation than traditional test piece measurements. In addition, shear viscosity determination of cross-linked materials without pretreatment is achieved, broadening the scope of material analysis through quantitative comparisons.

关键词： Mechanical properties of polymers Micro-scale analysis Shear viscosity of thermoset polymers

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Overlapping and Distinct Physical and Biological Phenotypes in Pure Frailty and Obese Frailty

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BIOSCIENCE REPORTS 2024年第11期44卷 BSR20240784页

作者： Ji, Fujue Park, Ji Hyun Rheem, Hyeonseung Kim, Jong-Hee Hanyang Univ Coll Performing Arts & Sport Div Sport Ind & Sci Major Sport Sci 222 Wangsimni Ro Seoul South Korea Hanyang Univ BK21 FOUR Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea

Background: Pure frailty and obese frailty are common types of frailty syndrome. However, the overlapping and distinct characteristics between pure frailty and obese frailty remain unclear. This study aims to reveal the overlapping/distinct physical and biological phenotypes of pure frailty and obese frailty, providing theoretical support for their prevention, diagnosis, and treatment. Method: Mice were fed either a normal or high-fat diet and assessed at 20 months of age. They were assigned to one of the four groups: control, obesity, pure frailty, and obese frailty. Grip strength, walking speed, physical activity, endurance, and body weight were measured to determine pure frailty and obese frailty. Physical and biological phenotypes were assessed. Results: Distinct physical phenotypes were observed between pure frailty and obese frailty in terms of body weight, lean mass, fat mass, fat mass in tissue, grip strength, endurance, and physical activity, while walking speed overlapped. In biological phenotypes, levels of Smad2/3, FoxO3a, P62, LAMP-2, and cathepsin L expression were distinct, while AKT, p-AKT, mTOR, p-mTOR, p-Smad2/3, p-FoxO3a, Beclin-1, ATG7, and LC3 overlapped. Conclusion: Distinct physical phenotypes observed in obese frailty are primarily attributable to the effect of obesity, with further impairment of muscle function resulting from the combined effects of frailty syndromes and obesity. Pure frailty and obese frailty share overlapping biological phenotypes, particularly in the regulation of muscle protein synthesis. Moreover, the interaction between obesity and frailty syndromes gives rise to both overlapping and distinct biological phenotypes, especially in the regulation of specific degradation signaling proteins.

关键词： frailty obesity phenotype

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Stable Open-Shell Conjugated Terpolymer with Extended NIR Absorption for Organic Photodetectors Detecting Beyond 1000 nm

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ACS APPLIED MATERIALS & INTERFACES 2025年第17期17卷 25591-25601页

作者： Jeong, Moon-Ki Lee, Sang Hyuk Won, Yousang Ahn, Jaeyong Kim, Myeong In Oh, Joon Hak Seoul Natl Univ Inst Chem Proc Sch Chem & Biol Engn Seoul 08826 South Korea Stanford Univ Dept Chem Engn Stanford CA 94305 USA Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea

Near-infrared (NIR) photodetectors play crucial roles in many scientific, industrial, and medicinal fields. However, conventional organic photodetectors (OPDs) often do not utilize the NIR region due to poor absorption beyond 1000 nm. In this study, an open-shell conjugated terpolymer is synthesized for NIR detection. This polymer contains diketopyrrolopyrrole (DPP), thiophene, and benzo[1,2-c;4,5-c ']bis[1,2,5]thiadiazole (BBT);these components form the novel random terpolymer poly{2,5-bis(2-decyltetradecyl)-3,6-di(thiophen-2-yl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione]-co-thiophene-co-benzo[1,2-c;4,5-c']bis[1,2,5]thiadiazole} (PDPPTBBT) via Stille coupling polymerization. The diradicals generated by the open-shell characteristics of PDPPTBBT become stronger as molecular packing is enhanced. This enhancement enables absorption at wavelengths beyond 1000 nm. PDPPTBBT exhibits temperature-independent Pauli paramagnetic properties. Additionally, electron paramagnetic resonance measurements reveal that compared with the singlet ground state, the polymer exhibits a higher stability in the triplet ground state and a high spin (S = 1). PDPPTBBT can act as an acceptor or a donor in films in which the material is blended with either poly(3-hexylthiophene-2,5-diyl) or Y6. OPDs prepared using the blended films display detection wavelengths exceeding 1000 nm with a maximum external quantum efficiency of 126% at 1050 nm and a specific detectivity (D*) of 7.5 x 1011 Jones.

关键词： open-shell polymers organic photodetectors conjugated polymers NIR sensors low bandgappolymers

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Hierarchical Nanoporous N-Doped Carbon for Enhanced Rate Performance of Lithium-Ion Battery Anodes

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ACS APPLIED NANO MATERIALS 2024年第15期7卷 17305-17315页

作者： Bansal, Neetu Agrim, Kavya Prakash Bohra, Aamir Mushtaq Ahamad, Tansir Park, Changyong Ahn, Heejoon Salunkhe, Rahul R. Indian Inst Technol IIT Jammu Dept Phys Mat Res Lab Jammu 181221 J&K India King Saud Univ Coll Sci Chem Dept Riyadh 11451 Saudi Arabia Hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program Seoul 04763 South Korea

At the nanoscale, the graphitic degree, surface area, and heteroatom doping are primary properties of any carbon material that influences anode performance for Li-ion battery (LIB) applications. The simultaneous control over nanostructured properties such as doping and surface area at the nanolevel remains challenging for achieving fast operating LIB. Here, we demonstrate a study on nitrogen-doped hierarchically nanoporous carbon (HNC) materials with specific dopant concentrations and tunable surface areas designed strategically via a dual-templating approach. The 3D nanoporous microflowers provide pathways to the lithium reservoir for fast charge-discharge. We explore the effect of different ammonia concentrations on nitrogen doping levels and the surface area of HNCs. Our findings reveal that consistently high surface area and excess nitrogen doping levels do not confer benefits. High-rate battery performance can be achieved at the expense of any of these properties. Using optimized HNC, we achieved a high-rate performance of 357 mAh g(-1) at 2 A g(-1) and approximately 87% stability retention after 600 cycles, showcasing its potential for LIB applications.

关键词： nanoporous carbon anode lithium doping performance templating method solid-electrolyte interphase storage

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Synergistic design of Pickering emulsion inks of nanochitosan-alginate-beeswax for edible coating in fruit preservation

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FOOD HYDROCOLLOIDS 2025年 167卷

作者： Kim, Jinkyung Seo, Jaesik Kim, Hyo Jeong Jeong, Yunho Lee, Hyunjun Park, Chanwook Eom, Youngho Pukyong Natl Univ Dept Polymer Engn Busan 48513 South Korea Hyundai Motor Co Mat Res & Engn Ctr Sustainable Mat Res Team Uiwang 16082 Gyonggi South Korea Hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program Seoul 04763 South Korea

Chitosan nanowhisker (CSW) has attracted attention as a coating agent in packaging applications because of its biocompatibility, anti-bacterial activity, and high gas barrier. However, the poor viscoelasticity of virgin CSW dispersions limits the coating process to spraying or dip-coating at very dilute concentrations. Herein, rheologyengineered CSW inks with improved coating abilities were designed, making them suitable for mass-produced coatings. Given the positive surface charge of CSW, eight types of negatively charged eco-friendly binders were selected, and their efficiency as rheological modifiers was assessed at a CSW:binder weight fraction of 1:1. Among them, three binders, sodium alginate (SA), carboxymethyl cellulose, and guar, simultaneously enhanced the viscoelasticity and homogeneity. Accordingly, the three composite inks exhibit high spreadability in practical coating. Particularly, the CSW/SA coating films exhibited remarkable mechanical properties with strength and toughness of 32.9 MPa and 1.4 MJ m-3, respectively. To apply edible coatings for fruit preservation, beeswax (BW) was mixed with CSW/SA to form Pickering emulsion inks. CSW acts as a Pickering stabilizer in the aqueous BW emulsion, affording it high dispersibility. Owing to its improved hydrophobicity, the edible CSW/SA/BW coating significantly extended the shelf life of bananas and strawberries.

关键词： Chitosan nanowhisker Viscoelastic composite ink Beeswax Pickering emulsion Edible coating

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Research Progress and Trends in Exercise Interventions for Mild Cognitive Impairment: A Bibliometric Visualization Analysis Using CiteSpace

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JOURNAL OF MULTIDISCIPLINARY HEALTHCARE 2025年 18卷 505-529页

作者： Han, Qifeng Kim, Sung Min Hanyang Univ Dept Phys Educ Seoul South Korea Hanyang Univ Dept Sport Sci 222 Wangsimni ro Seoul South Korea Hanyang Univ Human Tech Convergence Program BK21 FOUR Seoul South Korea Hanyang Univ Ctr Artificial Intelligence Muscle Seoul South Korea

Purpose: With the increasing global aging population, exercise interventions for mild cognitive impairment (MCI) have gained significant research attention. This study uses CiteSpace6.3R2 to systematically analyze the research progress and emerging trends in this field. Methods: A comprehensive literature search in the Web of Science Core Collection focused on exercise interventions for MCI. After screening, 420 relevant publications were imported into CiteSpace6.3R2 for bibliometric analysis, generating visual maps of keywords, authors, institutions, and other key indicators. Results: Publications on exercise interventions for MCI have shown steady growth, with Journal of Alzheimers' Disease leading in volume, and Geriatrics & Gerontology as the dominant subject area. The USA ranks highest in collaborative output, with the Chinese University of Hong Kong as the top institution. Among authors, Shimada Hiroyuki and three Japanese colleagues are key contributors, while Neurology is the most frequently co-cited journal. The most frequently co-cited author, Petersen, R.C. has his 2018 work as the top reference. High co-occurrence keywords include "mild cognitive impairment", "dementia", and "Alzheimer's disease". The primary keyword clusters are #0 Cognitive training, #1 Cognitive impairment, and #2 Mild Cognitive impairment, while newly burst keywords "systematic review", "recommendations", and "depression". Conclusion: Research on exercise interventions for MCI has been steadily gaining attention, becoming an interdisciplinary research area in fields such as geriatrics and neuroscience, with relevant findings concentrated in specific journals. In the collaboration network, developed countries dominate, showing systematic patterns of inter-institutional collaboration, while author collaborations are primarily focused within institutions. Current research is centered on the design and mechanisms of exercise intervention programs. Future studies will prioritize integrate

关键词： exercise intervention exercise therapy mild cognitive impairment cognitive dysfunction bibliometric visualization analysis CiteSpace

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Factors influencing life satisfaction: Role of physical fitness, body satisfaction, and shopping

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FAMILY & CONSUMER SCIENCES RESEARCH JOURNAL 2022年第2期51卷 90-102页

作者： Yoo, Jeong-Ju Lee, Sae Eun Baylor Univ Dept Human Sci & Design Waco TX 76798 USA Hanyang Univ Dept Clothing & Text Human Tech Convergence Program Seoul South Korea

The goal of this study was to assess the relationship between physical activity, body satisfaction, psychological distress, and life satisfaction. In addition, the effects of impulse and compulsive shopping behaviors concerning body satisfaction and psychological distress are analyzed. Two hundred thirty female college students participated in an online survey. Structural equation modeling was used to analyze the data. The results indicated that physical activity positively influences body image and ultimately improves life satisfaction. Compulsive shopping negatively affects psychological distress for individuals with poor body image. Physical activity professionals should recognize the factors that will impact one's life satisfaction.

关键词： body satisfaction irrational shopping life satisfaction physical activity psychological distress

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