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17th International Conference on Adaptive Structures and Technologies, ICAST 2006

作者： Goo, N.S. Paik, I.L. Jung, Y.C. Cho, J.W. Intelligent Microsystem Program Department of Advanced Technology Fusion Konkuk University Seoul 143-701 Korea Republic of Department of Aerospace Engineering Konkuk University Seoul 143-701 Korea Republic of Department of Textile Engineering Konkuk University Seoul 143-701 Korea Republic of

ISBN: (纸本)9781605601250

This paper discusses the actuation durability of a conducting shape memory polyurethane (CSMPU) actuator. Introduced in 2004, the CSMPU actuator was manufactured by an in situ polymerization method for shape memory polyurethane with multiwalled carbon nanotubes. In order to apply the CSMPU to smart actuators and determine detailed design concepts, the durability data should be measured. Hence, the experiments in this research were designed to obtain durability data, and the maximum number of actuation cycles versus the initial elongation ratio and the actuation temperature were measured for the purpose of assessing durability. The broken surfaces of the specimens were investigated.

关键词： Durability

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Edge atomic Fe sites decorated porous graphitic carbon as an efficient bifunctional oxygen catalyst for Zinc-air batteries

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Journal of Energy Chemistry 2023年第8期83卷 602-611,I0014页

作者： Ruihui Gan Yali Wang Xiangwu Zhang Yan Song Jingli Shi Chang Ma Tianjin Municipal Key Lab of Advanced Fiber and Energy Storage Technology Tiangong UniversityTianjin 300387China Fiber and Polymer Science Program Department of Textile EngineeringChemistry and ScienceWilson College of TextilesNorth Carolina State UniversityRaleighNC 27695-8301uNITED sTATES CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001ShanxiChina

The development of advanced bifunctional oxygen electrocatalysts for oxygen reduction and evolution reactions(ORR and OER) is critical to the practical application of zinc-air batteries(ZABs). Herein, a silica-assisted method is reported to integrate numerous accessible edge Fe-Nx sites into porous graphitic carbon(named Fe-N-G) for achieving highly active and robust oxygen electrocatalysis. Silica facilitates the formation of edge Fe-Nx sites and dense graphitic domains in carbon by inhibiting iron *** purification process creates a well-developed mass transfer channel for Fe-N-G. Consequently,Fe-N-G delivers a half-wave potential of 0.859 V in ORR and an overpotential of 344 m V at10 m A cm^(-2)in OER. During long-term operation, the graphitic layers protect edge Fe-Nx sites from demetallation in ORR and synergize with Fe OOH species endowing Fe-N-G with enhanced OER *** functional theory calculations reveal that the edge Fe-Nx site is superior to the in-plane Fe-Nx site in terms of OH* dissociation in ORR and OOH* formation in OER. The constructed ZAB based on Fe-N-G cathode shows a higher peak power density of 133 m W cm^(-2)and more stable cycling performance than Pt/C + RuO2counterparts. This work provides a novel strategy to obtain high-efficiency bifunctional oxygen electrocatalysts through space mediation.

关键词： Bifunctionality EdgeFe-Nxsites Oxygen catalysis Graphitic domains Zinc-air batteries

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Li<sub>2</sub>MnSiO<sub>4</sub>/Carbon Composite Nanofibers as a High-Capacity Cathode Material for Li-Ion Batteries

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Soft Nanoscience Letters 2012年第3期2卷 54-57页

作者： Shu Zhang Ying Li Guanjie Xu Shuli Li Yao Lu Ozan Topracki Xiangwu Zhang Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh NC.

Li2MnSiO4 has an extremely high theoretical capacity of 332 mAh?g?1. However, only around half of this capacity has been realized in practice and the capacity retention during cycling is also low. In this study, Li2MnSiO4/carbon composite nanofibers were prepared by a combination of electrospinning and heat treatment. The one-dimensional continuous carbon nanofiber matrix serves as long-distance conductive pathways for both electrons and ions. The composite nanofiber structure avoids the aggregation of Li2MnSiO4 particles, which in turn enhances the electrode conductivity and promotes the reaction kinetics. The resultant Li2MnSiO4/carbon composite nanofibers were used as the cathode material for Li-ion batteries, and they delivered high charge and discharge capacities of 218 and 185 mAh?g?1, respectively, at the second cycle. In addition, the capacity retention of Li2MnSiO4 at the first 20th cycles increased from 37% to 54% in composite nanofibers.

关键词： Electrospinning Li2MnSiO4 Carbon Nanofibers Li-Ion Battery

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Centrifugally-spun nanofibers for advanced energy storage

Centrifugally-spun nanofibers for advanced energy storage

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2014国际纳米技术和新能源材料研讨会——暨世界著名科学家来鄂讲学计划武汉论坛

作者： Xiangwu Zhang Fiber and Polymer Science Program Department of Textile EngineeringChemistry and ScienceNorth Carolina State University

Among the various existing energy storage technologies, rechargeable lithium-ion batteries and supercapacitors have been considered as two important solutions to the increasing needs for high-performance electrochemical power sources. N ovel centrifugally-spun nanofibers with functional properties can dramatically alter surface reaction rates and charge transport throughout the batteries and supercapacitors,

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Design of Sustainable Polymer Materials Through Molecular Simulations

Design of Sustainable Polymer Materials Through Molecular Si...

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The 12th Asian textile Conference (第12届亚洲纺织会议暨2013年纺织学术年会)

作者： Melissa A.Pasquinelli Fiber and Polymer Science Program/Textile Engineering Chemistry and Science North Carolina State University USA

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Coprecipitation Strategy for Halide-Based Solid-State Electrolytes and Atmospheric-Dependent In Situ Analysis

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ACS Applied Materials and Interfaces 2024年第21期16卷 27394-27399页

作者： Bilo, Josanelle Angela V. Chang, Chung-Kai Chuang, Yu-Chun Fang, Mu-Huai Research Center for Applied Sciences Academia Sinica Taipei11529 Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu30013 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Tsinghua University Hsinchu30013 Taiwan Department of Science and Technology Philippine Textile Research Institute Taguig City1631 Philippines National Synchrotron Radiation Research Center Hsinchu300 Taiwan

In the continuous pursuit of an energy-efficient alternative to the energy-intensive mechanochemical process, we developed a coprecipitation strategy for synthesizing halide-based solid-state electrolytes that warrant both structural control and commercial scalability. In this study, we propose a new coprecipitation approach to synthesized Li3InCl6, exhibiting both structural and electrochemical performance stability, with a high ionic conductivity of 1.42 × 10-3 S cm-1, comparable to that of traditionally prepared counterparts. Through the in situ synchrotron X-ray diffraction technique, we unveil the stability mechanisms and rapid chemical reactions of Li3InCl6 under dry Ar, dry O2, and high-humidity atmosphere, which were not previously reported. Furthermore, the fast reversibility capability of moisture-exposed Li3InCl6 was tracked under vacuum, revealing the optimal recovery conditions at low temperatures (150-200 °C). This work addresses the critical challenges in structural engineering and sustainable mass production and provides insights into chemical reactions under real-world conditions. © 2024 The Authors. Published by American Chemical Society.

关键词： Coprecipitation

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Light Transmission in Knitted Fabrics Through Polymeric Optical Fiber Insertion for Advanced textile Applications

SSRN

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SSRN 2024年

作者： Modesto, Larissa Nascimento Porto, Bruna Bessa, Gisele Cristina Rincon, Leonardo Mejia Steffens, Fernanda Federal University of Santa Catarina Textile Engineering Department SC Blumenau89036-002 Brazil Federal University of Santa Catarina Postgraduate Program in Textile Engineering SC Blumenau89036-002 Brazil

Smart textiles are prominent in the textile industry, with applications in various technical areas such as medicine, architecture, sports, and esthetic purposes, among others. Within this concept, optical fibers are classified as passive smart textiles and are highly attractive for clothing lighting and monitoring physiological parameters. This study aimed to present methods for inserting polymeric optical fibers into weft single knitted fabrics and verifying the loss of luminosity in them, analyzing the technical feasibility of developing e-textiles to be applied in monitoring. For such, weft knitted fabrics were produced by altering the optical fiber insertion methodology, defined as inlay insertion and insertion in the course direction, each subdivided into different methods. Light transmission was verified using a laser pen connected to the optical fiber. Images were captured and analyzed using LILP software to verify and quantify the loss of luminosity in each insertion method. Light transmission microscopy was performed to evaluate the surface of the polymeric optical fiber used. For the insertion techniques performed, inlay and by course direction, the result obtained for signal transmission was satisfactory;however, the inlay insertion methods presented lower light emission but lower luminosity loss than the insertion by course direction. This result is very interesting because it enables the development of weft knitted fabrics from the use of optical fibers for application in various types of monitoring. © 2024, The Authors. All rights reserved.

关键词： Light transmission

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A Braided Flexible Zn-MnO2 Yarn Battery Based on Cobweb-Like Carbonized Polypyrrole Modified Carbon Fiber Electrodes

SSRN

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SSRN 2023年

作者： Chen, Lei Hu, Kairui Yang, Ke Yanilmaz, Meltem Han, Xu Liu, Yong Zhang, Xiangwu School of Textile Science and Engineering Tiangong University Tianjin300387 China Department of Textile Engineering Istanbul Technical University Istanbul Turkey Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science Wilson College of Textiles North Carolina State University RaleighNC27695 United States

Flexible zinc ion batteries (ZIBs) are promising candidate for energy storage devices because of high safety and low cost. Carbon fiber (CF) is an ideal current collector for ZIBs due to its good flexibility, electrical conductivity and corrosion resistance. Herein, a novel CF-based current collector is proposed. At first, the inertness and non-polarity of CF were significantly modified by activating and etching to obtain a multi-layered pore structure. After then, carbonized polypyrrole (CPPy) nanowire conductive networks were built up on etched carbon fiber (ECF) by electrochemical in-situ growing and carbonization. Based on the CPPy network, MnO2 nanoflowers were grown firmly by the hydrothermal method to construct a multilayer MnO2@CPPy@ECF composite electrode. The multi-layered three-dimensional CPPy conductive network is rooted in the interior of MnO2, providing a dedicated transmission path for both electrons and ions during electrochemical redox reactions. The MnO2@CPPy@ECF electrode had an initial capacity of 346.1 mAh·g-1 at 0.1 A·g-1 and 252.8 mAh·g-1 after 800 cycles. In addition, the integrated flexible Zn-MnO2 2D fabric battery with MnO2@CPPy@ECF fabric cathode shows a specific capacity of 254.7 mAh·g-1 at 0.1 A · g-1. Finally, a flexible Zn-MnO2 yarn battery with unique structural advantages of high flexibility, shape adaptability, structural integrity and good mechanical stability was fabricated by the 2D braid method. The initial specific capacity of the flexible Zn-MnO2 yarn battery is 111.7 mAh·g-1 at 0.1C, and the coulomb efficiency reaches more than 98%. This work opens up a new pathway for the rational design of flexible electrodes for wearable ZIBs. © 2023, The Authors. All rights reserved.

关键词： Yarn

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Advanced Nanofibrous Energy-Storage Materials

Advanced Nanofibrous Energy-Storage Materials

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The 12th Asian textile Conference (第12届亚洲纺织会议暨2013年纺织学术年会)

作者： Xiangwu Zhang Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh USA

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Highly Thermally Stable, Highly Electrolyte-Wettable Hydroxyapatite/Cellulose Nanofiber Hybrid Separators for Lithium-Ion Batteries

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ACS Applied Energy Materials 2023年第7期6卷 3862-3871页

作者： Liu, Yi Li, Chunxing Li, Chao Liang, Zhenye Hu, Xueshan Liu, Hao Zhang, Ze Cui, Meng Chen, Gang Wan, Jiayu Zhang, Xiangwu Tao, Jinsong State Key Lab of Pulp and Paper Engineering South China University of Technology Guangzhou510640 China SUSTech Energy Institute for Carbon Neutrality Southern University of Science and Technology Shenzhen518055 China Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen518055 China Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science Wilson College of Textiles North Carolina State University RaleighNC27695-8301 United States

Separators have an important influence on the safety and performance of lithium-ion batteries (LIBs). However, traditional polyolefin-based separators suffer from poor thermal stability and weak electrolyte wettability. Here, by using hydroxyapatite (HAP) and cellulose nanofibers (CNFs) as raw materials, we fabricated a unique HAP/CNF hybrid separator. The separators exhibit excellent thermal properties, with high thermal stability (up to 250 °C) and outstanding flame retardancy. The separators also demonstrate excellent electrolyte wettability. Compared to polypropylene (PP) separators, the HAP/CNF separators show a smaller contact angle with electrolytes, 17.2° for HAP/CNF and 45.5° for PP. Meanwhile, the HAP/CNF separators illustrate an excellent smoothness of 68.0 nm. In addition, the batteries assembled with the hybrid separators display a better performance compared with the batteries assembled with commercial PP separators. The raw materials are green, and the fabrication processes are free of organic solvents. We envision that the HAP/CNF hybrid separator could be a promising separator candidate for next-generation high-safety and high-performance LIBs. © 2023 American Chemical Society.

关键词： Thermodynamic stability

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