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Scaled-up synthesis of defect-rich layered double hydroxide monolayers without organic species for efficient oxygen evolution reaction

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Green Energy & Environment 2022年第5期7卷 975-982页

作者： Haoyuan Chi Jingwen Dong Tian Li Sha Bai Ling Tan Jikang Wang Tianyang Shen Guihao Liu Lihong Liu Luyi Sun Yufei Zhao Yu-Fei Song State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China College of Chemistry Key Laboratory of Theoretical&Computational Photochemistry of Ministry of EducationBeijing Normal UniversityBeijing100875China Polymer Program Institute of Materials Science and Department of Chemical&Biomolecular EngineeringUniversity of ConnecticutStorrsConnecticut06269USA Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing100029China

The scaled-up synthesis of organic-free monolayer nanomaterials is highly desirable,especially in obtaining green energy by *** this study,a method for the scaled-up synthesis of the series of monolayer layered double hydroxides(LDHs)without the addition of organic solvents is reported via the separate nucleation and aging steps *** resulting monolayer LDHs with the thicknesses of less than 1 nm showed a narrow thickness distribution.X-ray absorption fine-structure revealed that monolayer NiFe-LDH nanosheets have a number of oxygen and metal vacancies *** a practical application,monolayer NiFe-LDH nanosheets containing defects showed an enhanced electrocatalytic water oxidation activity compared with that of bulk *** functional theory calculations uncovered that excellent catalytic activity is attributed to vacancies *** proposed method is an economical and universally applicable strategy for the scaled-up production of monolayer LDHs.

关键词： process synthesis monolayer

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Advanced Flexible Carbon‑Based Current Collector for Zinc Storage

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Advanced Fiber Materials 2022年第6期4卷 1500-1510页

作者： Hao Jia Minghui Qiu Chunxia Tang Hongqi Liu Jinlin Xu Benjamin Tawiah Shou‑xiang Jiang Xiangwu Zhang Key Laboratory of Eco‑Textiles Ministry of EducationJiangnan UniversityWuxiJiangsuPeople’s Republic of China Institute of Textiles and Clothing The Hong Kong Polytechnic UniversityHong KongPeople’s Republic of China Department of Industrial Art(Textiles) Kwame Nkrumah University of Science and TechnologyKumasiGhana Fiber and Polymer Science Program Department of Textile EngineeringChemistry and ScienceWilson College of TextilesNorth Carolina State UniversityRaleighNC 27695‑8301USA

Carbon cloth(CC)-based electrodes have attracted extensive attention for next-generation wearable energy-storage devices due to their excellent electrical conductivity and mechanical ***,the application of conventional CC-based electrodes for zinc(Zn)storage severely hinders Zn ion transport and induces deleterious Zn dendrite growth,resulting in poor electrochemical ***,a novel oxygen plasma-treated carbon cloth(OPCC)is rationally designed as a current collector for flexible hybrid Zn ion supercapacitors(ZISs).The modified interface of OPCC with abundant oxygenated groups enables enhanced electrolyte wettability and uniform superficial electric field distribution.A prolonged working lifespan for Zn electrodeposition is achieved by the OPCC due to the improved interfacial kinetics and homogenized ion *** as-prepared hybrid ZIS also delivers excellent cycling endurance(98.5%capacity retention for 1500 cycles)with outstanding operation stability under various extreme *** facile surface modification strategy provides a new way for developing future flexible electrodes for wearable electronic products.

关键词： Zinc ion supercapacitor Carbon cloth Oxygen plasma treatment Interface kinetics

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Preparation of Novel partially Bio-Based Thermoplastic Polyurethane / Polyacrylonitrile Electrospun Fiber Mats 21

Preparation of Novel partially Bio-Based Thermoplastic Polyu...

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21st International Union of Materials Research Societies International Conference in Asia, IUMRS-ICA 2021

作者： Saisangtham, Suchawadee Okhawilai, Manunya Potiyaraj, Pranut Interdisciplinary Program in Petrochemistry and Polymer Science Faculty of Science Chulalongkorn University Bangkok10330 Thailand Metallurgy and Materials Science Research Institute Chulalongkorn University Bangkok10330 Thailand Department of Materials Science Faculty of Science Chulalongkorn University Bangkok10330 Thailand Center of Excellence on Petrochemical and Materials Technology Chulalongkorn University Bangkok10330 Thailand

The partially bio-based thermoplastic polyurethane/polyacrylonitrile electrospun fiber mats at various weight ratio was fabricated via electrospinning technique. A partially bio-based thermoplastic polyurethane was prepared from caprolactone diol and partially bio-based diisocyanate at a mole ratio of 2.1:1. Ethylene glycol was used as a chain extender. Three major effects i.e. solution concentration, distance from tip to collector and applied voltage on morphology of the obtained electrospun fiber mats were systematically investigated using a scanning electron microscope. The design of experiment, namely, Taguchi method was also applied. The morphology of the prepared electrospun fiber mats revealed continuous and smooth fibers without the formation of beads. The fiber diameters of the thermoplastic bio-based polyurethane/polyacrylonitrile were in micron size ranging from 0.2 to 1.4 µm. Moreover, the results showed that with the decrease of concentration, the fiber diameter decreased where the changes of applied voltage and distance from tip to collector resulted in negligible changes in fiber diameter. The findings can be further applied as processing conditions to meet properties requirements for the high-performance separator application. © Published under licence by IOP Publishing Ltd.

关键词： Taguchi methods

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Effects of nanopores and sulfur doping on hierarchically bunched carbon fibers to protect lithium metal anode

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Carbon Energy 2021年第5期3卷 784-794页

作者： Ji In Jung Sunwoo Park Son Ha Se Youn Cho Hyoung-Joon Jin Young Soo Yun Program in Environmental and Polymer Engineering Inha UniversityIncheonSouth Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoulSouth Korea Carbon Composite Materials Research Center Korea Institute of Science and TechnologyWanju-gunJeollabuk-doSouth Korea Department of Polymer Science and Engineering Inha UniversityIncheonSouth Korea Department of Integrative Energy Engineering Korea UniversitySeoulSouth Korea

Studies on three-dimensional structured carbon templates have focused on how to guide homogeneous lithium metal nucleation and growth for lithium metal anodes(LMAs).However,there is still insufficient evidence for a key factor to achieve their high electrochemical ***,the effects of nanopores and sulfur doping on carbon-based nanoporous host(CNH)electrode materials for LMAs were investigated using natural polymer-derived *** pore-filling behaviors of lithium metal in the nanopores of the CNH electrode materials were first observed by ex situ scanning electron microscopy analysis,where the protective lithium metal nucleation and growth process led to significantly high Coulombic efficiency(CE)of~99.4%and stable 600 *** addition,a comparison study of CNH and sulfurdoped CNH(S-CNH)electrodes,which differ only in the presence or absence of sulfur,revealed that sulfur doping can cause lower electrochemical series resistance,higher CE value,and better cycling stability in a wide range of current densities and number of ***,S-CNH-based LMAs showed high electrochemical performance in full-cell Li-S battery tests using a sulfur copolymer cathode,where a high energy density of 1370Wh kgelectrode−1 and an excellent power density of 4120Wkgelectrode−1 were obtained.

关键词： carbon template Li-S batteries lithium metal anode lithium metal batteries nanoporous carbon sulfur doping

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A Review on Digital Simulation Strategies and Its Applications for Advanced Compression Garments 16

A Review on Digital Simulation Strategies and Its Applicatio...

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16th Textile Bioengineering and Informatics Symposium, TBIS 2023

作者： Youn, Seonyoung Darden, Ryan Mathur, Kavita Fiber and Polymer Science Ph.D. Program North Carolina State University RaleighNC27606 United States Department of Textile Engineering Chemistry and Sciences M.S. Textile Engineering Program North Carolina State University RaleighNC27606 United States Department of Textile and Apparel Technology and Management North Carolina State University RaleighNC27606 United States

ISBN: (纸本)9781713879473

This paper presents a comprehensive review on the current state of digital simulation technology and its strategic application usages with a key focus on advanced compression garments. Although three-dimensional (3D) digital garment simulators have significantly impacted the apparel and textile industry, their use has been limited to visual prototyping, quality checking, or marketing. The physical properties of garment simulators have been overlooked in advanced functional manufacturing. This literature review investigates the possibility of strategically utilizing virtual physical properties to enhance garment functions, specifically in wearables and medical-grade compression fields. The first phase of this paper gives an overview of the current state of 3D garment simulation tools and their measurement features. This is followed by a gap analysis between simulated and physical property evaluations, focusing on minimizing the gaps. The literature is thoroughly examined to identify appropriate studies that uses digital tools for compressional garments and add value to wearables and healthcare applications. This paper provides valuable insights for apparel and textile engineers, enabling them to better understand the limitations and capabilities of garment simulators in improving advanced features for specific end users. © TBIS 2023. All rights reserved.

关键词： Physical properties

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Development of green materials from ENR-25/PHBV blends: Curing characteristics and mechanical performance 21

Development of green materials from ENR-25/PHBV blends: Curi...

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21st International Union of Materials Research Societies International Conference in Asia, IUMRS-ICA 2021

作者： Tomano, N. Boondamnoen, O. Aumnate, C. Potiyaraj, P. Program in Petrochemistry and Polymer Science Faculty of Science Chulalongkorn University Bangkok10330 Thailand Department of Materials Science Faculty of Science Chulalongkorn University Bangkok10330 Thailand Center of Excellence on Petrochemical and Materials Technology Chulalongkorn University Bangkok10330 Thailand Metallurgy and Materials Science Research Institute Chulalongkorn University Soi Chula 12 Phayathai Rd. Bangkok10330 Thailand

The objective of this work was to develop green materials from epoxidized natural rubber (25% epoxidation), (ENR-25), poly(3-hydroxybutyrate-co-3-hydroxyvalerate), (PHBV), and polybutadiene adducted with maleic anhydride, (PB-g-MA) as compatibilizer. The ENR-25/PHBV blends were prepared at the ratio of 100/0, 90/10, and 80/20 with 0 and 10 %wt. PB-g-MA. The blends were prepared using an internal mixer, where PHBV was first melted at a temperature of 175 °C before mixing with ENR-25 and the incorporation of a compatibilizer. The mixing of ENR-25 and PHBV was continued at a temperature of 175 °C and mixing speed of 50 rpm until it reaches the complete blending time. All ENR-25/PHBV blends were then mixed with curing agents in an internal mixer at a temperature of 50 °C. The cure characteristics were determined using a moving die rheometer (MDR). Then vulcanization proceeded in a compression molding machine. The result shows that the addition of PHBV enhanced the modulus of ENR-25 for every blend ratio with and without compatibilizer owing to the mechanical properties of PHBV. Significantly, the PB-g-MA compatibilizer successfully improved the interface adhesion between ENR-25 and PHBV and the decrease in phase size was clearly seen in the SEM images. © Published under licence by IOP Publishing Ltd.

关键词： Curing

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Biomass-Based Discrete Furan Oligomers as Materials for Electrochromic Devices

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ACS Sustainable Chemistry and Engineering 2024年第1期12卷 459-469页

作者： Atayde, Eduardo C. Fong, Guan-Lun Yeh, Jyun-Yi Matsagar, Babasaheb M. Wang, Yu-Cheng Chen, De-Chian Peng, Chi-How Li, Yi-Pei Yamauchi, Yusuke Ho, Kuo-Chuan Wu, Kevin C.-W. Molecular Science and Technology Program Taiwan International Graduate Program (TIGP-MST) Academia Sinica No. 128 Sec. 2 Academia Road Taipei 11529 Taiwan Department of Chemistry National Tsing Hua University No. 101 Sec. 2 Kuang-Fu Road Hsinchu 30013 Taiwan Department of Chemical Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan Sustainable Chemical Science and Technology Program Taiwan International Graduate Program (TIGP-SCST) Academia Sinica No. 128 Sec. 2 Academia Road Taipei 11529 Taiwan School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN) The University of Queensl Brisbane 4072 QLD Australia Department of Materials Process Engineering Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan Institute of Polymer Science and Engineering National Taiwan University No.1 Sec. 4 Roosevelt Rd. Taipei 10617 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University No. 135 Yuandong Rd. Taoyuan 320 Taiwan

Electrochromic devices (ECDs) are materials that can undergo reversible changes in transmittance when exposed to different applied potentials. While many conjugated heterocyclic oligomers, such as oligothiophenes, have been developed for this purpose, there is no reported study on the use of discrete oligomeric furans as ECD materials. In this work, we introduce a furan trimer that can be utilized as a discrete electrochromic material, which transitions from light yellow to red and has a very high coloration efficiency of 1940 cm²/C at 507 nm. We propose that the reversible π-stack formation of the oligomer radical cations is behind this phenomenon, as evidenced by both experimental and computational results. The derivability of this oligomer from biomass and its facile synthesis make it an interesting alternative for other existing organic electrochromic materials. © 2023 American Chemical Society

关键词： electrochromism furan oligomer hydroxyalkylation−alkylation reaction solvatochromism π-stacks

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Two-dimensional MXenes:New frontier of wearable and flexible electronics

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InfoMat 2022年第4期4卷 1-28页

作者： Abbas Ahmed Sudeep Sharma Bapan Adak Md Milon Hossain Anna Marie LaChance Samrat Mukhopadhyay Luyi Sun Polymer Program Institute of Materials ScienceUniversity of ConnecticutStorrsConnecticutUSA Advanced Sensor and Energy Research(ASER)Lab Department of Electronic EngineeringKwangwoon UniversitySeoulSouth Korea Department of Textile and Fiber Engineering Indian Institute of TechnologyNew DelhiIndia Department of Textile Engineering Chemistry and ScienceNorth Carolina State UniversityRaleighNorth CarolinaUSA Department of Textile Engineering Khulna University of Engineering&TechnologyKhulnaBangladesh Department of Chemical and Biomolecular Engineering University of ConnecticutStorrsConnecticutUSA

Wearable electronics offer incredible benefits in mobile healthcare monitoring,sensing,portable energy harvesting and storage,human-machine interactions,etc.,due to the evolution of rigid electronics structure to flexible and stretchable ***,transition metal carbides and nitrides(MXenes)are highly regarded as a group of thriving two-dimensional nanomaterials and extraordinary building blocks for emerging flexible electronics platforms because of their excellent electrical conductivity,enriched surface functionalities,and large surface *** article reviews the most recent developments in MXene-enabled flexible electronics for wearable *** MXeneenabled electronic devices designed on a nanometric scale are highlighted by drawing attention to widely developed nonstructural attributes,including 3D configured devices,textile and planer substrates,bioinspired structures,and printed ***,the unique progress of these nanodevices is highlighted by representative applications in healthcare,energy,electromagnetic interference(EMI)shielding,and humanoid control of *** emerging prospects of MXene nanomaterials as a key frontier in nextgeneration wearable electronics are envisioned and the design challenges of these electronic systems are also discussed,followed by proposed solutions.

关键词： flexible electronics MXene nanostructures wearable electronics

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Design optimization of a high-pressure economizer header in heat recovery steam generators to mitigate flow-accelerated corrosion

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Results in Engineering 2025年 26卷

作者： Khunphakdee, Phuris Phuakpunk, Kiattikhoon Piemjaiswang, Ratchanon Chalermsinsuwan, Benjapon Program of Petrochemistry and Polymer Science Faculty of Science Chulalongkorn University Bangkok Thailand Nonthaburi Thailand Energy Research Institute Chulalongkorn University Bangkok10330 Thailand Sustainable Environment Research Institute Chulalongkorn University Bangkok Thailand Fuels Research Center Department of Chemical Technology Faculty of Science Chulalongkorn University Bangkok Thailand

Flow accelerated corrosion remains an active damage in heat recovery steam generators. A recent case took place in tubes downstream an inlet header of a high-pressure economizer harp after six years of operation. The harp includes an inlet header, an outlet header, tubes, and connecting pipes conveying water between harps. The patterned damage raised concerns about the header design. Thus, this research examined the effects of design variables including chromium content, header size, and the number of connecting pipes on the FAC. A CFD model with k-Ε RNG turbulence model and the Chilton-Colburn analogy was employed to predict FAC rates. Design of experiments was applied to generate a data set for ANOVA analysis. From the results, increasing chromium content most effectively reduces the FAC rate, followed by adding more connecting pipes and their interaction. Adding more pipes redistributes peak velocities to more tubes and reduces peaks magnitude. A 50 % reduction in peak velocity is observed when the number of pipes increased from 3 to 7. Although increasing header size has smaller impact, it theoretically reduces flow acceleration and pressure drops at downstream tubes’ entrances, leading to more uniform flow and reduced FAC rates. The regression model, with R-squared of 0.995, accurately predicts FAC rates. Optimal design variables, 3.16 % Cr steel, 85.64 mm header diameter, and 7 connecting pipes yield an FAC rate of 0.0359 mm/year, with a 2.68 % deviation from the CFD prediction. The proposed methodology and findings provide valuable insights for optimizing HRSG header design to mitigate FAC. © 2025 The Author(s)

关键词： Boiler circulation

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Graphene-functionalized textile composites for wearable Joule heating applications

Advanced Nanocomposites

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Advanced Nanocomposites 2025年 2卷 108-123页

作者： Omar Faruk Abbas Ahmed Ashfaqul Hoque Khadem Lu Jia Luyi Sun Department of Materials Science and Engineering Binghamton University State University of New York at Binghamton NY 13902 USA Polymer Program Institute of Materials Science and Department of Chemical & Biomolecular Engineering University of Connecticut Storrs CT 06269 USA Department Mechanical Engineering College of Engineering Computing and Applied Science Clemson University Clemson SC 29634 USA College of Textile Engineering Taiyuan University of Technology Jinzhong Shanxi 030600 China

Thermal comfort is essential for maintaining physiological well-being, with textile materials traditionally serving as the primary medium for regulating heat exchange between the body and its environment. However, conventional textiles often fall short of maintaining optimal thermal balance. So, there is an increasing demand for advanced thermoregulation systems that can effectively reduce heat loss and enhance warmth, ensuring consistent comfort. Recent research has highlighted the promise of advanced functional materials, especially graphene and its composites, for modifying textiles to improve thermal properties. This article comprehensively reviews recent advancements in graphene-functionalized textile composites, focusing on their applications in wearable Joule heaters designed for personalized thermal comfort or thermal therapy. Various graphene-functionalized textile composites are reviewed from the perspectives of material properties, processing strategies and device fabrication methods. Key challenges and future opportunities are summarized for graphene-functionalized textile-based Joule heaters as innovative solutions in wearable thermal regulation.

关键词： Graphene Textile Composite Wearable electronics Joule heater

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