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Highly Ordered Thermoplastic Polyurethane/Aramid Nanofiber Conductive Foams Modulated by Kevlar Polyanion for Piezoresistive Sensing and Electromagnetic Interference Shielding

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Nano-Micro Letters 2023年第6期15卷 335-352页

作者： Kunpeng Qian Jianyu Zhou Miao Miao Hongmin Wu Sineenat Thaiboonrod Jianhui Fang Xin Feng School of Materials Sciences and Engineering Shanghai UniversityShanghai 200444People’s Republic of China Research Center of Nano Science and Technology Shanghai UniversityShanghai 200444People’s Republic of China National Nanotechnology Center(NANOTEC) National Science and Technology Development Agency(NSTDA)Thailand Science ParkPathum Thani 12120Thailand

Highly ordered and uniformly porous structure of conductive foams is a vital issue for various functional purposes such as piezoresistive sensing and electromagnetic interference(EMI) shielding. With the aids of Kevlar polyanionic chains, thermoplastic polyurethane(TPU) foams reinforced by aramid Nanofibers(ANF) with adjustable pore-size distribution were successfully obtained via a nonsolvent-induced phase separation. In this regard, the most outstanding result is the in situ formation of ANF in TPU foams after protonation of Kevlar polyanion during the NIPS process. Furthermore, in situ growth of copper nanoparticles(Cu NPs) on TPU/ANF foams was performed according to the electroless deposition by using the tiny amount of pre-blended Ti_(3)C_(2)T_(x) MXene as reducing agents. Particularly, the existence of Cu NPs layers significantly promoted the storage modulus in 2,932% increments, and the well-designed TPU/ANF/Ti_(3)C_(2)T_(x) MXene(PAM-Cu) composite foams showed distinguished compressive cycle stability. Taking virtues of the highly ordered and elastic porous architectures, the PAM-Cu foams were utilized as piezoresistive sensor exhibiting board compressive interval of 0–344.5 kPa(50% strain) with good sensitivity at 0.46 kPa^(-1). Meanwhile,the PAM-Cu foams displayed remarkable EMI shielding effectiveness at 79.09 dB in X band. This work provides an ideal strategy to fabricate highly ordered TPU foams with outstanding elastic recovery and excellent EMI shielding performance, which can be used as a promising candidate in integration of satisfactory piezoresistive sensor and EMI shielding applications for human–machine interfaces.

关键词： Highly ordered conductive foams MXene Nanofiber Thermoplastic Kevlar polyanion Piezoresistive sensing Electromagnetic interference shielding

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Highly Efficient,Dual‑Functional Self‑Assembled Electrospun Nanofiber Filters for Simultaneous PM Removal and On‑Site Eye‑Readable Formaldehyde Sensing

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Advanced Fiber Materials 2023年第3期5卷 1088-1103页

作者： Jin Yeong Song Seongmin Kim Jaeseong Park Sang Min Park School of Mechanical Engineering Pusan National University63‑2 Busan University‑RoGeumjeong‑GuBusan 46241South Korea

Air pollution containing particulate matter(PM)and volatile organic compounds has caused magnificent burdens on indi-vidual health and global economy.Although advances in highly efficient or multifunctional Nanofiber filters have been achieved,many existing filters can only deal with one type of air pollutant,such as capturing PM or absorbing and detecting toxic gas.Here,highly efficient,dual-functional,self-assembled electrospun Nanofiber(SAEN)filters were developed for simultaneous PM removal and onsite eye-readable formaldehyde sensing fabricated on a commercial fabric mask.With the use of an electrolyte solution containing a formaldehyde-sensitive colorimetric agent as a collector during electrospinning,the one-step fabrication of the dual-functional SAEN filter on commercial masks,such as a fabric mask and a daily dispos-able mask,was achieved.The electrolyte solution also allowed the uniform deposition of electrospun Nanofibers,thereby achieving the high efficiency of PM filtration with an increased quality factor up to twice that of commercial masks.The SAEN filter enabled onsite and eye-readable formaldehyde gas detection by changing its color from yellow to red under a 5 ppm concentrated formaldehyde gas atmosphere.The repetitive fabrication and detachment of the SAEN filter on a fabric mask minimized the waste of the mask while maintaining high filtration efficiency by replenishing the SAEN filters and reusing the fabric mask.Given the dual functionality of SAEN filters,this process could provide new insights into design-ing and developing high performance and dual-functional electrospun Nanofiber filters for various applications,including individual protection and indoor purification applications.

关键词： Electrospinning Nanofiber Self-assembly PM removal Formaldehyde sensing

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Three-dimensional architecture using hollow Cu/C Nanofiber interpenetrated with MXenes for high-rate lithium-ion batteries

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Rare Metals 2023年第10期42卷 3378-3386页

作者： Jing-Chong Liu Lin-Lin Ma Shuai Li Lan-Lan Hou Xin-Ran Qi Yong-Qiang Wen Guo-Ping Hu NüWang Yong Zhao Xiao-Xian Zhao Beijing Key Laboratory for Bioengineering and Sensing Technology Daxing Research InstituteSchool of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing100083China Key Laboratory of Intelligent Textile and Flexible Interconnection of Zhejiang Province Hangzhou310018China Department of Chemistry College of ScienceHebei Agriculture UniversityBaoding071001China School of Chemistry Beihang UniversityBeijing100191China Key Laboratory of Rare Earths Ganjiang Innovation AcademyChinese Academy of SciencesGanzhou341119China

Improving the electron/ion transport ability and alleviating expansion during charging/discharging processes are vital for lithium-ion batteries(LIBs).In this work,a three-dimensional anode was fabricated using conductive hollow carbon-based nano tubes interpenetrated MXene architecture by directing the assembly of flexible electrospun hollow copper/carbon nanotubes and rigid Ti_(3)C_(2)T_(x) MXene nanosheets.The introduction of copper into carbon matrix leads to an improvement of lithium storage owing to the increase of disorder graphite.Additionally,the unique structure of the fabricated electrode provides a cross-network for fast electron diffusion by preventing the stack of nanotubes and MXene nanosheets.Consequently,the optimized electrode exhibits a high initial capacity of 424.45mAh·g^(-1) and maintains at 378.05 mAh·g^(-1) with a current density of 5 A·g^(-1) after 1000 cycles.This strategy of structural and chemical optimization provides new ideas for developing high-performance and durable electrochemical energy storage devices in the future.

关键词： Nanofiber Hollow structure Electrospinning Carbon materials Lithium-ion battery

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Carbon dots embedded Nanofiber films:Large-scale fabrication and enhanced mechanical properties

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Chinese Chemical Letters 2022年第1期33卷 304-307页

作者： Chang Liu Rui Cheng Jiazhuang Guo Ge Li He Li Hong-Gang Ye Zhi-Bin Liang Cai-Feng Wang Su Chen State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineeringand Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer MaterialsNanjing Tech UniversityNanjing 210009China

Valuable application prospects and large-scale production technologies are powerful driving forces for the development of materials science.Carbon dots(CDs)are a kind of promising carbon-based fluorescent nanomaterials,which possess wide application prospects based and even beyond the fluorescence properties.Herein,we report the fast and high-yield synthesis of CDs and the large-scale preparation of fluorescent Nanofiber films with enhanced mechanical properties.CDs were prepared from magnetic hyperthermia treatment of citric acid and carbamide,with the output of 25.37 g in a single batch.The asprepared CDs exhibit a high absolute photoluminescence(PL)quantum yield(QY)of 67%and wonderful dispersibility in polar solvents.Then,solution blow spinning of CDs and polymer matrixes of alcohol soluble polyurethane(APU)and polyacrylonitrile(PAN)led to large-area fluorescent CDs-embedded Nanofiber films,APU/CDs(size:120 cm×18 cm)and PAN/CDs(size:120 cm×22 cm),respectively.The resultant large-area APU/CDs and PAN/CDs Nanofiber films have dramatically enhanced mechanical properties,to show integrated improvement of tensile strength and elongation.

关键词： Carbon dots Mass production Solution blow spinning Nanofiber Mechanical properties

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Synergetic Improvement of Interlaminar Fracture Toughness in Carbon Fiber/Epoxy Composites Interleaved with PES/PEK‑C Hybrid Nanofiber Veils

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Advanced Fiber Materials 2022年第5期4卷 1081-1093页

作者： Jinli Zhou Chenyu Zhang Chao Cheng Ming Wang Zhihui Yang Yanfei Yang Hongying Yang Muhuo Yu Zhongyuan University of Technology Zhengzhou 450000China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua UniversityShanghai 201620China Shanghai University of Engineering Science Shanghai 201620China Henan University of Engineering Zhengzhou 450000China

In this study,two types of soluble thermoplastic resins were added to epoxy resin at a fixed weight ratio to prepare a three-phase cast body.The cast was then manufactured into hybrid Nanofiber as interleaves for interlaminar toughening of carbon fiber/epoxy resin(CF/EP)composites using a co-solvent method.The results revealed that when the hybrid components reached 15 wt%,Polyethersulfone(PES)and polyaryletherketone cardo(PEK-C)exhibited the best synergistic toughening effect,and the fracture toughness increased by 99.8%and 39.8%,respectively,compared with the reference or the same proportion of the single PES toughened sample.We used PES/PEK-C hybrid Nanofibers with an areal density of 19.2 g per square meter(gsm)as composite toughening layers.Apart from the lack of significant influence of PES Nanofiber on CF/EP composites,the interlaminar fracture toughness of mode I and mode II layers increased by 88.3%and 46.9%,respectively,compared to the reference sample.Scanning Electron Microscopy of the fracture surface and cross-section micromorphology of the laminate displayed that the thermoplastic microspheres of different sizes contribute differently to crack resistance:PEK-C consumes more energy due to the debonding and extraction of microspheres and resin,whereas the presence of the PES phase can induce more plastic deformation and crack deflection.

关键词： Carbon fiber/epoxy resin Polyethersulfone Polyaryletherketone cardo Interlaminar fracture toughness Nanofiber

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Preparation,characterization and performance of an electrospun carbon Nanofiber mat applied in hexavalent chromium removal from aqueous solution

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Journal of Environmental Sciences 2019年第3期31卷 75-84页

作者： Zhihua Yuan Xiaoxia Cheng Lubin Zhong Renxiang Wu Yuming Zheng CAS Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences

Hexavalent chromium, Cr(VI), a highly toxic oxyanion known as a carcinogen and mutagen,is an issue of concern due to its adverse impact on human health. Therefore, development of effective technologies and/or materials for Cr(VI) removal from water has been of great interest for researchers. In this study, an electrospun carbon Nanofiber(CNF) mat was prepared via electrospinning polyacrylonitrile(PAN), followed by thermal pre-oxidation and carbonization. Scanning electron microscopy(SEM) observation showed that the fiber diameter of the CNF with carbonization temperature of 950°C(CNF_(950)) was about 266 nm.Potentiometric titration analysis demonstrated that the point of zero charge p H(pHpzc) of CNF_(950) was around 7.93. CNF_(950) demonstrated high adsorption capacity and fast adsorption kinetics for Cr(VI) at pH < 3. Langmuir isotherm calculations showed that the maximum adsorption capacity of Cr(VI) on CNF_(950) was 118.8 mg/g at pH 2. The adsorption isotherm of Cr(VI) on CNF_(950) was well described by the Redlich–Peterson model, revealing that Cr(VI)adsorption was the result of a combination of monolayer and multilayer adsorption,depending on the initial Cr(VI) concentration. Solution pH greatly affected Cr(VI) adsorption onto CNF_(950) due to the electrostatic interaction, and the adsorption capacity was relatively high when pH was below 3. X-ray photoelectron spectroscopy(XPS) analysis revealed that the removal of Cr(VI) might be the result of a combination of redox reaction and electrostatic adsorption. The adsorption-saturated CNF_(950) could be regenerated by NaOH solution. This study extends the potential applicability of electrospun CNF mats for Cr(VI)-contaminated water purification.

关键词： Adsorption Carbon Nanofiber mat Electrospinning Hexavalent chromium Redox reaction

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Fabrication of High-Efficiency Polyvinyl Alcohol Nanofiber Membranes for Air Filtration Based on Principle of Stable Electrospinning

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Journal of Donghua University(English Edition) 2023年第2期40卷 142-148页

作者：高婷婷郑军妹王丹阳 Ningbo Fotile Kitchen Ware Company Ningbo 315336China Key Laboratory of Healthy&Intelligent Kitchen System Integration of Zhejiang Province Ningbo 315336China

A mass flow matching model(MFMM)was established for studying the stable status of solution electrospinning.The study of the solution droplet status at the needle tip focused on various combinations of applied voltages and injection rates to figure out their influence on steadily fabricating polyvinyl alcohol(PVA)Nanofibers prepared from PVA spinning solutions with two different mass fractions(10%and 16%).The results revealed that during the stable electrospinning,the influence resulted from the change of the injection rate approximately canceled out the impact brought by adjusting the applied voltage,leading to almost the same morphology as that of the PVA Nanofibers.And the mass fraction of PVA in the spinning solution dominated the structure and the diameter distribution of the electrospun Nanofibers.Under stable electrospinning conditions,the composite membrane was produced by depositing PVA Nanofibers on the polyethylene terephthalate(PET)nonwoven substrate for an air filtration test.Furthermore,the prepared composite membrane exhibited a high air filtration efficiency(99.97%)and a low pressure drop(120 Pa)for 300-500 nm neutralized polystyrene latex(PSL)aerosol particles,demonstrating its potential as an alternative for a variety of commercial applications in air filtration.

关键词： polyvinyl alcohol(PVA) Nanofiber stable electrospinning air filtration membrane

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A new insight into the stability of Nanofiber electrodes used in proton exchange membrane fuel cells

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Journal of Energy Chemistry 2020年第3期29卷 126-132页

作者： Yanyan Gao Ming Hou Liang He Manman Qi Haiping Chen Shaojing Hong Yongyi Jiang Zhigang Shao Baolian Yi Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100039China Guangzhou Automobile Group Co.Ltd. Automotive Engineering InstituteGuangzhou 510080GuangdongChina Anhui Mingtian Hydrogen Energy Technology Co.Ltd. Lu’an 237000AnhuiChina

The Nanofiber electrodes have been considered as promising candidates for commercial proton exchange membrane fuel cells due to their high catalyst utilization and enhanced mass transport efficiency.However,for the first time our research determined that the Nanofiber electrodes were restricted by the poor chemical stability of the polymer carriers.To gain further insight into the durability of Nanofiber electrodes,both cyclic voltammetry aging tests and Fenton’s tests were conducted.Similar to previous reports,our research demonstrated that Nanofiber electrodes showed remarkable stability in the cyclic voltammetry aging process.However,Fenton’s tests indicated that Nanofibers in the electrodes would decompose easily while being attacked by reactive oxygen species such as HO·or HOO·,which greatly limits their practicability and reliability.The different performances under the two tests also demonstrated that the cyclic voltammetry aging protocols,which have been applied extensively,cannot well mirror the real operating conditions of fuel cells.

关键词： PEMFC Nanofiber electrode Stability

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Bidirectional micro-actuators based on eccentric coaxial composite oxide Nanofiber

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Nano Research 2020年第9期13卷 2451-2459页

作者： Guang Wang He Ma Xiang Jin Hua Yuan Yang Wei Qunqing Li Kaili Jiang Shoushan Fan State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics and Tsinghua-Foxconn Nanotechnology Research CenterTsinghua UniversityBeijing 100084China College of Applied Science Beijing University of TechnologyBeijing 100124China Collaborative Innovation Center of Quantum Matter Beijing 100084China

It is of great importance to develop new micro-actuators with high performance by optimizing the structures and materials.Here we develop a VO2/AI2O3/CNT eccentric coaxial Nanofiber,which can be potentially applied as a micro-actuator.The specific eccentric coaxial structure was efficiently fabricated by conventional thin film deposition methodology with individual CNT templet.Activated by thermal and photothermal stimuli,the as-developed actuator delivers a bidirectional actuation behavior with large amplitudes and an ultra-fast response,〜2.5 mS.A tweezer can be further made by assembling two such Nanofibers symmetrically onto a tungsten probe.Clamping and unclamping can be realized by laser stimulus.More experimental and simulation investigations indicated that the actuation behaviors could be attributed to the nanostructured eccentric coaxial geometry,the thermal coefficient mismatch between layers and the fast phase transition of V02.The micro-actuators will have potentials in micro manipulators,nanoscaled switches,remote controls and other autonomous systems.Furthermore,a large variety of coaxial and eccentric coaxial Nanofibers with various functions can also be developed,giving the as-developed methodology more opportunities.

关键词： carbon nanotube vanadium dioxide actuator Nanofiber phase transition

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基于三维芳纶纳米纤维骨架的柔性高压复合电解质膜及其固态锂金属电池

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Science China Materials 2020年第5期63卷 703-718页

作者：刘乐浩吕婧莫金珊彭鹏李静如姜冰褚立华李美成 State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Renewable EnergyNorth China Electric Power UniversityBeijing 102206China Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of SciencesSuzhou 215123China

聚合物电解质在锂金属电池中的应用受限于锂枝晶生长、电化学不稳定性及较低的离子电导率.为解决这些问题,本文通过向三维多孔芳纶纳米纤维(ANF)中填充聚环氧乙烷(PEO)-双三氟甲基磺酰亚胺锂(LiTFSI)电解质,制备了基于三维芳纶纳米纤维... 详细信息

聚合物电解质在锂金属电池中的应用受限于锂枝晶生长、电化学不稳定性及较低的离子电导率.为解决这些问题,本文通过向三维多孔芳纶纳米纤维(ANF)中填充聚环氧乙烷(PEO)-双三氟甲基磺酰亚胺锂(LiTFSI)电解质,制备了基于三维芳纶纳米纤维网络骨架的柔性ANF/PEO-LiTFSI复合电解质薄膜.由于其独特的构造及离子在三维ANF/PEO-LiTFSI界面中的连续输运,该复合电解质膜具有比PEO-LiTFSI电解质膜更高的力学强度(10.0 MPa)、热稳定性、电化学稳定性(60℃下达4.6 V)和离子电导率,以及较强的抑制锂枝晶能力.基于该复合电解质的固态LiFePO4/Li电池表现出优异的循环性能(在0.4 C下充放电百次后的容量达130 mA h g-1、保持率为93%).该研究提供了一种基于三维骨架设计和制备高性能电解质的有效方法,有望应用于固态锂金属电池.

关键词： composite electrolyte aramid Nanofiber threedimensional scaffold mechanical stability Li metal battery

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