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Temperature‑Arousing Self‑Powered Fire Warning E‑Textile Based on p-n Segment Coaxial Aerogel Fibers for Active Fire Protection in Firefighting Clothing

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Nano-Micro Letters 2023年第12期15卷 141-160页

作者： Hualing He Yi Qin Zhenyu Zhu Qing Jiang Shengnan Ouyang yuhang wan Xueru Qu Jie Xu Zhicai Yu State Key Laboratory of New Textile Materials and Advanced Processing Technologies School of Textile Science and EngineeringWuhan Textile UniversityWuhan 430200People’s Republic of China National Local Joint Laboratory for Advanced Textile Processing and Clean Production Hubei Key Laboratory of Biomass Fibers and Eco‑Dyeing and FinishingWuhan Textile UniversityWuhan 430200People’s Republic of China Jiangsu New Horizon Advanced Functional Fiber Innovation Center Co. Ltd.Suzhou 215000People’s Republic of China

Firefighting protective clothing is a crucial protective equipment for firefighters to minimize skin burn and ensure safety firefighting operation and rescue mission.A recent increasing concern is to develop self-powered fire warning materials that can be incorporated into the firefighting clothing to achieve active fire protection for firefighters before the protective clothing catches fire on fireground.However,it is still a challenge to facilely design and manufacture thermoelectric(TE)textile(TET)-based fire warning electronics with dynamic surface conformability and breathability.Here,we develop an alternate coaxial wet-spinning strategy to continuously produce alternating p/n-type TE aerogel fibers involving n-type Ti_(3)C_(2)T_(x)MXene and p-type MXene/SWCNT-COOH as core materials,and tough aramid nanofiber as protective shell,which simultaneously ensure the flexibility and high-efficiency TE power generation.With such alternating p/n-type TE fibers,TET-based self-powered fire warning sensors with high mechanical stability and wearability are successfully fabricated through stitching the alternating p-n segment TE fibers into aramid fabric.The results indicate that TET-based fire warning electronics containing 50 p-n pairs produce the open-circuit voltage of 7.5 mV with a power density of 119.79 nW cm-2 at a temperature difference of 300℃.The output voltage signal is then calculated as corresponding surface temperature of firefighting clothing based on a linear relationship between TE voltage and temperature.The fire alarm response time and flame-retardant properties are further displayed.Such self-powered fire warning electronics are true textiles that offer breathability and compatibility with body movement,demonstrating their potential application in firefighting clothing.

关键词： Self-powered fire warning Coaxial wet spinning P-n segment thermoelectric fiber Thermoelectric textiles Active fire protection

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Electrochemical synthesis of trimetallic nickel-iron-copper nanoparticles via potential-cycling for high current density anion exchange membrane water-splitting applications

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Journal of Energy Chemistry 2024年第2期89卷 535-542,I0012页

作者： Ziqi Zhang Sheng wan Hanbo wang Jinghan He Ruige Zhang yuhang Qi Haiyan Lu State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012JilinChina

Hydrogen is known for its elevated energy density and environmental compatibility and is a promising alternative to fossil fuels.Alkaline water electrolysis utilizing renewable energy sources has emerged as a means to obtain high-purity hydrogen.Nevertheless,electrocatalysts used in the process are fabricated using conventional wet chemical synthesis methods,such as sol-gel,hydrothermal,or surfactantassisted approaches,which often necessitate intricate pretreatment procedures and are vulnerable to post-treatment contamination.Therefore,this study introduces a streamlined and environmentally conscious one-step potential-cycling approach to generate a highly efficient trimetallic nickel-iron-copper electrocatalyst in situ on nickel foam.The synthesized material exhibited remarkable performance,requiring a mere 476 mV to drive electrochemical water splitting at 100 mA cm^(-2)current density in alkaline solution.Furthermore,this material was integrated into an anion exchange membrane watersplitting device and achieved an exceptionally high current density of 1 A cm^(-2)at a low cell voltage of2.13 V,outperforming the noble-metal benchmark(2.51 V).Additionally,ex situ characterizations were employed to detect transformations in the active sites during the catalytic process,revealing the structural transformations and providing inspiration for further design of electrocatalysts.

关键词： Electrocatalytic water splitting Hydrogen evolution reaction Oxygen evolution reaction Electrochemical synthesis Anion exchange membrane

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Low-dimensional van der Waals materials for linear-polarization-sensitive photodetection: materials, polarizing strategies and applications

Materials Futures

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Materials Futures 2024年第1期3卷 95-127页

作者： yuhang Ma Huaxin Yi Huanrong Liang wan wang Zhaoqiang Zheng Jiandong Yao Guowei Yang State Key Laboratory of Optoelectronic Materials and Technologies Nanotechnology Research CenterSchool of Materials Science&EngineeringSun Yat-sen UniversityGuangzhou 510275GuangdongPeople’s Republic of China Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices Sun Yat-sen UniversityGuangzhou 510275GuangdongPeople’s Republic of China School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006GuangdongPeople’s Republic of China

Detecting light from a wealth of physical degrees of freedom(e.***.wavelength,intensity,polarization state,phase,etc)enables the acquirement of more comprehensive information.In the past two decades,low-dimensional van der Waals materials(vdWMs)have established themselves as transformative building blocks toward lensless polarization optoelectronics,which is highly beneficial for optoelectronic system miniaturization.This review provides a comprehensive overview on the recent development of low-dimensional vdWM polarized photodetectors.To begin with,the exploitation of pristine 1D/2D vdWMs with immanent in-plane anisotropy and related heterostructures for filterless polarization-sensitive photodetectors is introduced.Then,we have systematically epitomized the various strategies to induce polarization photosensitivity and enhance the degree of anisotropy for low-dimensional vdWM photodetectors,including quantum tailoring,construction of core–shell structures,rolling engineering,ferroelectric regulation,strain engineering,etc,with emphasis on the fundamental physical principles.Following that,the ingenious optoelectronic applications based on the low-dimensional vdWM polarized photodetectors,including multiplexing optical communications and enhanced-contrast imaging,have been presented.In the end,the current challenges along with the future prospects of this burgeoning research field have been underscored.On the whole,the review depicts a fascinating landscape for the next-generation high-integration multifunctional optoelectronic systems.

关键词： polarization-discriminating photodetectors 1D van der Waals materials

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Hybrid plasmon waveguide leveraging Bloch surface polaritons for sub-wavelength confinement

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Science China Technological Sciences 2013年第3期56卷 567-572页

作者： wan yuhang ZHENG Zheng SHI XiaoGang BIAN YuSheng LIU JianSheng School of Electronic and Information Engineering Beihang University School of Instrument and Science and Optic-electronic Engineering Beihang University

A novel hybrid plasmonic waveguide based on a guided Bloch surface polariton structure is proposed and investigated.This hybrid waveguide overcomes the weak confinement in the Bloch surface polariton structure caused by the diffraction limitation.By introducing a metal stripe near the dielectric ridge located on the periodic multilayer structure that is designed to support a TM polarized Bloch surface polariton,a sub-wavelength scale electric field confinement is realized.The coupling of the Bloch surface polariton and the surface plasmon polariton results in a strong field distribution within the gap between the metal stripe and the dielectric ridge.The variation of the characteristic of the hybrid mode is revealed via tuning the height of the ridge and the coupling distance.Sub-wavelength scale mode size is realized as well as a propagation length of about 100μm.

关键词： Bloch surface wave plasmonic waveguide

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Fluorescent Double Network Hydrogels with Ionic Responsiveness and High Mechanical Properties for Visual Detection

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Journal of Wuhan University of Technology(Materials Science) 2024年第2期39卷 487-496页

作者：郑湾 LIU Lerong Lü Hanlin wanG yuhang LI Feihu ZHANG Yixuan 陈艳军 wanG Yifeng School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

We developed a fluorescent double network hydrogel with ionic responsiveness and high mechanical properties for visual detection.The nanocomposite hydrogel of laponite and polyacrylamide serves as the first network,while the ionic cross-linked hydrogel of terbium ions and sodium alginate serves as the second network.The double-network structure,the introduction of nanoparticles and the reversible ionic crosslinked interactions confer high mechanical properties to the hydrogel.Terbium ions are not only used as the ionic cross-linked points,but also used as green emitters to endow hydrogels with fluorescent properties.On the basis of the “antenna effect” of terbium ions and the ion exchange interaction,the fluorescence of the hydrogels can make selective responses to various ions(such as organic acid radical ions,transition metal ions) in aqueous solutions,which enables a convenient strategy for visual detection toward ions.Consequently,the fluorescent double network hydrogel fabricated in this study is promising for use in the field of visual sensor detection.

关键词： visual detection ionic responsiveness fluorescent hydrogels double network hydrogels mechanical property

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Hybrid plasmon waveguide leveraging Bloch surface polaritons for sub-wavelength confinement

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Chinese Science Bulletin 2013年第7期58卷 567-572页

关键词：等离子体波导表面极化子混合模式波长等离激元表面等离子体激元极化结构金属条带

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非同步模式振荡器的设计

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集成电路应用 2023年第11期40卷 6-7页

作者：万宇航吴郁北京工业大学信息学部北京100020

阐述一种性能较高的非同步模式的振荡器的设计,通过外接RC可调电路充放电实现振荡功能。利用Cadence软件平台搭建电路并进行系统仿真。振荡器的主要模块包括比较器、分压电路、放电电路以及逻辑电路。仿真结果表明,在供电电压为5V时,振... 详细信息

阐述一种性能较高的非同步模式的振荡器的设计,通过外接RC可调电路充放电实现振荡功能。利用Cadence软件平台搭建电路并进行系统仿真。振荡器的主要模块包括比较器、分压电路、放电电路以及逻辑电路。仿真结果表明,在供电电压为5V时,振荡器能有效地实现内部翻转,输出稳定的时钟信号。可应用于DC-DC电源管理芯片中。

关键词：振荡器非同步模式放电电路逻辑电路

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无人机辅助认知边缘计算鲁棒资源分配方案

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西安邮电大学学报 2023年第3期28卷 1-9页

作者：刘伯阳何雯静马杰万宇航万奕尧西安邮电大学通信与信息工程学院陕西西安710121

为了扩展移动边缘计算(Mobile Edge Computing, MEC)的服务覆盖范围,并为MEC网络中的次用户(Secondary Users, SU)提供频谱接入机会,将无人机(Unmanned Aerial Vehicle, UAV)技术、认知无线电(Cognitive Radio, CR)与MEC技术进行结合,提出一种UAV辅助认知边缘计算鲁棒资源分配方案。该方案在主用户(Primary User, PU)位置存在估计误差时联合优化时间分配、计算和通信资源分配以及UAV波束成形矢量和部署位置,建立SU与UAV能耗加权和最小化问题。为求解该问题,采用鲁棒优化理论和连续凸近似算法优化UAV波束成形矢量和位置,再利用变量替换与拉格朗日对偶算法对转换后的凸问题求解,从而优化时间、计算和通信资源分配变量。仿真结果表明,所提方案可以有效提高系统鲁棒性并减少系统能耗,不同参数下的性能仿真证明了所提方案的有效性。

关键词：移动边缘计算无人机认知无线电鲁棒资源分配

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功能梯度锥-柱连接壳的环向自由振动分析

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固体力学学报 2024年第1期45卷 74-87页

作者：庞磊成龙刘文光张宇航吕志鹏宛润豪南昌航空大学航空制造工程学院南昌330063 东北大学机械工程与自动化学院沈阳110819

论文旨在分析功能梯度锥-柱连接壳的环向自由振动,以提高其结构的振动性能和稳定性.采用Voigt模型和四参数幂函数体积分数描述功能梯度材料属性,基于Donnell薄壳理论推导出锥壳和柱壳的位移与应变关系,分别得出锥壳和柱壳的能量表达式.... 详细信息

论文旨在分析功能梯度锥-柱连接壳的环向自由振动,以提高其结构的振动性能和稳定性.采用Voigt模型和四参数幂函数体积分数描述功能梯度材料属性,基于Donnell薄壳理论推导出锥壳和柱壳的位移与应变关系,分别得出锥壳和柱壳的能量表达式.引入人工弹簧模拟边界和壳体间的连接条件,依据Chebyshev多项式构造位移函数,基于Rayleigh-Ritz法求解FGMs锥-柱连接壳模态频率,分析梯度指数、边界条件和几何参数对模态频率的影响.结果表明:增加陶瓷体积分数能有效提高结构的模态频率,而增大梯度指数则会降低结构的模态频率;边界约束条件越强,FGMs锥-柱连接壳的模态频率越高;随着环向波数的增大,边界条件对结构模态频率的影响越来越弱,边界约束效果作用于圆柱壳明显强于圆锥壳;当环向波数大于3时,随着壳体厚度增大,结构的模态频率呈线性提高,而增大锥柱壳长度比会降低结构模态频率;在锥柱壳长度比一定时,随着锥角的增大会使结构的模态频率先增加到峰值后减小.

关键词：锥-柱连接壳功能梯度材料 Chebyshev多项式模态频率

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钢渣粉对提钛渣胶凝材料中氯离子固化效果的影响机理研究

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化工矿物与加工 2024年第1期53卷 28-34页

作者：万紫妍唐颂罗利明彭耀谢宇航杨越梁雨西南科技大学环境与资源学院西南科技大学矿物材料及应用研究所西南科技大学核废物与环境安全国防重点学科实验室

钢渣粉(SSP)用作掺料可以促进胶凝材料的强度增长，但其对胶凝材料中Cl-固化效果的影响机理尚不明确。基于此，将磨细的SSP加入到提钛渣(TETS)中，制备了CaO-SSP-TETS胶凝材料固化体，探究钢渣粉对固化体中Cl-固化效果的影响机理。保持... 详细信息

钢渣粉(SSP)用作掺料可以促进胶凝材料的强度增长，但其对胶凝材料中Cl-固化效果的影响机理尚不明确。基于此，将磨细的SSP加入到提钛渣(TETS)中，制备了CaO-SSP-TETS胶凝材料固化体，探究钢渣粉对固化体中Cl-固化效果的影响机理。保持CaO含量和液固比不变，考查不同钢渣粉与提钛渣质量比、不同养护龄期固化体中Cl-的固化量及固化量增长倍数，采用氯离子快速测定仪、XRD、SEM和EDS分别对固化体浸出液的Cl-浓度、水化反应产物、微观形貌和微区成分进行表征，结果表明：Cl-固化量与提钛渣掺量成正比，Cl-固化量增长倍数随钢渣粉掺量的升高先增大后减小，钢渣粉与提钛渣的质量比为1∶1时，Cl-固化量的增长倍数最高。固化体中新生成物相主要是水铝钙石、方解石和水化硅酸钙，固化体对Cl-的固化主要是水铝钙石对Cl-的化学固化和水化硅酸钙对Cl-的物理吸附。

关键词：提钛渣钢渣粉固化体氯离子固化化学固化物理吸附

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