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Tailoring of a robust asymmetric aramid nanofibers/MXene aerogel film for enhanced infrared thermal camouflage and Joule heating performances

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Nano Research 2024年第3期17卷 1990-1998页

作者： Wanbin Dang Wei Guo Wenting Chen qiuyu zhang Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

The development of infrared(IR)surveillance technology has led to a growing interest in thermal camouflage.However,the trade-off relationship between low IR-emissivity and thermal insulation hinders the advance of thermal camouflage materials.Herein,guided by multi-physics simulation,we show a design of asymmetric aramid nanofibers/MXene(ANF/MXene)aerogel film that realizes high-efficient thermal camouflage applications.The rationale is that the asymmetric structure contains a thermal-insulation three-dimensional(3D)network part to prevent effective heat transfer and a low IR-emissivity(~0.3)dense surface layer to suppress radiative heat emission.It is remarkable that the synergy mechanism in the topology structure contributes to over 40%reduction of target radiation temperature.Impressively,the tailored asymmetric ANF/MXene aerogel film also enables sound mechanical properties such as a Young’s modulus of 44.4 MPa and a tensile strength of 1.3 MPa,superior to most aerogel materials.It also exhibits great Joule heating performances including low driving voltage(4 V),fast thermal response(<10 s),and long-term stability,further enabling its versatile thermal camouflage applications.This work offers an innovative design concept to configure multifunctional structures for next-generation thermal management applications.

关键词： asymmetric aerogel film low infrared(IR)-emissivity thermal insulation IR thermal camouflage Joule heating performance

Recycling the spent electronic materials to construct a highperformance Cu_(1.94)S/ZnS heterostructure anode of sodium-ion batteries

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Nano Research 2024年第5期17卷 4006-4015页

作者： Xiaowei He Tianshuai Wang Lidong Tian qiuyu zhang School of Chemistry and Chemical Engineering Xi’an Key Laboratory of Functional Organic Porous MaterialsKey Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information TechnologyNorthwestern Polytechnical UniversityXi’an 710072China Chongqing Science and Technology Innovation Center of Northwestern Polytechnical University Chongqing 401135China College of Materials Science and Engineering Xi’an University Science and TechnologyXi’an 710054China

Heterostructure engineering by coupling different nanocrystals has received extensive attention because it can enhance the reaction kinetics of the anode of sodium-ion batteries(SIBs).However,constructing high-quality heterostructure anode materials through green and environmentally friendly methods remains a challenge.Herein,we have proposed a simple one-step method by recycling the electronic waste metal materials to synthesize the Cu_(1.94)S/ZnS heterostructure materials.Combined with the experimental analysis and first principle calculations,we find that the synergistic effect of different components in heterostructure structures can significantly enhance the reversible capacity and rate performance of anode materials.Based on the constructed Cu_(1.94)S/ZnS anode,we obtain a superior reversible capacity of 440 mAh·g^(-1) at 100 mA·g^(-1) and 335 mAh·g^(-1) after 3000 cycles at 2000 mA·g^(-1).Our work sheds new light on designing high-rate and capacity anodes for SIBs through the greenness synthesis method.

关键词： sodium-ion batteries heterostructure reversible capacity environmentally synthesis process

A healable, mechanically robust and ultrastretchable ionic conductive elastomer for durably wearable sensor

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Nano Research 2024年第4期17卷 3369-3378页

作者： Guoxian zhang Chunmei Li JiaoJun Tan Mingqi Wang Yafeng Ren Feijie Ge qiuyu zhang Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China College of Bioresources Chemical and Materials Engineering National Demonstration Center for Experimental Light Chemistry Engineering EducationShaanxi University of Science&TechnologyXi’an 710021China

The ionic conductive elastomers show great promise in multifunctional wearable electronics,but they currently suffer from liquid leakage/evaporation or mechanical compliance.Developing ionic conductive elastomers integrating non-volatility,mechanical robustness,superior ionic conductivity,and ultra-stretchability remains urgent and challenging.Here,we developed a healable,robust,and conductive elastomer via impregnating free ionic liquids(ILs)into the ILs-multigrafted poly(urethane-urea)(PUU)elastomer networks.A crucial strategy in the molecular design is that imidazolium cations are largely introduced by double-modification of PUU and centipede-like structures are obtained,which can lock the impregnated ILs through strong ionic interactions.In this system,the PUU matrix contributes outstanding mechanical properties,while the hydrogen bonds and ionic interactions endow the elastomer with self-healing ability,conductivity,as well as non-volatility and transparency.The fabricated ionic conductive elastomers show good conductivity(3.8×10^(-6) S·cm^(-1)),high mechanical properties,including tensile stress(4.64 MPa),elongation(1470%),and excellent healing ability(repairing efficiency of 90%after healing at room temperature for 12 h).Significantly,the conductive elastomers have excellent antifatigue properties,and demonstrate a highly reproducible response after 1000 uninterrupted extension-release cycles.This work provides a promising strategy to prepare ionic conductive elastomers with excellent mechanical properties and stable sensing capacity,and further promote the development of mechanically adaptable intelligent sensors.

关键词： ionic conductive elastomers poly(urethane-urea)(PUU) ionic interactions centipede-like self-healing

Nanostructured MXene-based materials for boosting hydrogen sorption properties of Mg/MgH_(2)

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Materials Reports(Energy) 2024年第1期4卷 58-68页

作者： Yingyan Zhao Bolun Wang Li Ren Yinghui Li Xi Lin qiuyu zhang Zhigang Hu Jianxin Zou National Engineering Research Center of Light Alloys Net Forming&State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai200240PR China Shanghai Engineering Research Center of Mg Materials and Applications&School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai200240PR China Shanghai Key Laboratory of Hydrogen Science&Center of Hydrogen Science Shanghai Jiao Tong UniversityShanghai200240PR China

Hydrogen holds the advantages of high energy density,great natural abundance and zero emission,making it suitable for large scale and long term energy storage,while its safe and efficient storage is still challenging.Among various solid state hydrogen storage materials,MgH_(2) is promising for industrial applications due to its high gravimetric and volumetric hydrogen densities and the abundance of Mg on earth.However,the practical application of MgH_(2) has been limited by its stable thermodynamics and slow hydrogen desorption kinetics.Nanocatalysis is considered as a promising approach for improving the hydrogen storage performance of MgH_(2) and bringing it closer to the requirements of commercial applications.It is worth mentioning that the recently emerging two-dimensional material,MXene,has showcased exceptional catalytic abilities in modifying the hydrogen storage properties of MgH_(2).Besides,MXene possesses a high surface area,excellent chemical/physical stability,and negatively charged terminating groups,making it an ideal support for the"nanoconfinement"of MgH_(2) or highly active catalysts.Herein,we endeavor to provide a comprehensive overview of recent investigations on MXene-based catalysts and MXene supports for improving the hydrogen sorption properties of Mg/MgH_(2).The mechanisms of hydrogen sorption involved in Mg-MXene based composites are highlighted with special emphases on thermodynamics,kinetics,and catalytic behaviors.The aim of this work is to provide a comprehensive and objective review of researches on the development of high-performance catalysts/supports to improve hydrogen storage performances of Mg/MgH_(2) and to identify the opportunities and challenges for future applications.

关键词： Magnesium-based hydride MXene Catalytic modification Nano-confinement Hydrogen storage performance

Core-shell structured Co@NC@MoS_(2)magnetic hierarchical nanotubes:Preparation and microwave absorbing properties

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Journal of Materials Science & Technology 2022年第33期128卷 148-159页

作者： Yunfei zhang Yulong Li Mengmeng Wei Dengtao Yang qiuyu zhang Baoliang zhang School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710072China Xi’an Key Laboratory of Functional Organic Porous Materials Northwestern Polytechnical UniversityXi’an 710129China Shaanxi Engineering and Research Center for Functional Polymers on Adsorption and Separation Sunresins New Materials Co.Ltd.Xi’an 710072China

In this study,a new lightweight one-dimensional absorber Co@NC@MoS_(2)was designed and prepared.Firstly,polydopamine(PDA)was coated by oxidative self-polymerization with cobalt-nitrilotriacetic acid chelate nanowires(Co-NTAC)as template.Then core-shell structured magnetic hierarchical nanotubes(Co@PDA@MoS_(2))were prepared by one-step hydrothermal method.After thermal annealing,PDA layer was transformed into nitrogen doped carbon layer(NC)to obtain the efficient microwave absorber Co@NC@MoS_(2).The removal of template and growth of MoS_(2)were completed simultaneously,the preparation process was simplified.Because of its good magnetic loss and dielectric loss,Co@NC@MoS_(2)shows excellent microwave absorption performance.Under filler content of 15 wt.%,the minimum reflection loss(RL_(min))can reach-61.97 dB@9.2 GHz,and the effective absorption bandwidth(EAB)is 5.6 GHz.The electromagnetic parameters of Co@NC@MoS_(2)can be further adjusted by changing the load of MoS_(2).Meanwhile,the structure and composition of Co@NC@MoS_(2)were systematically analyzed.The influence of the microstructure on the microwave absorbing properties was investigated,and the microwave attenuation mechanism is revealed.As an efficient and lightweight absorber,Co@NC@MoS_(2)has potential application value in the construction of new stealth coatings.

关键词： Nanotubes Magnetic materials Core-shell structure MoS_(2)nanosheets Electromagnetic wave absorption

Magnetic field-induced strategy for synergistic CI/Ti_(3)C_(2)T_(x)/PVDF multilayer structured composite films with excellent electromagnetic interference shielding performance

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Journal of Materials Science & Technology 2022年第15期110卷 246-259页

作者： Qing Liu Yi zhang Yibin Liu Chunmei Li Zongxu Liu Baoliang zhang qiuyu zhang MOE Key Laboratory of Materials Physics and Chemistry under Extraordinary Conditions Northwestern Polytechnical UniversityXi’an 710072China Research and Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China

Lightweight,scalable,mechanically flexible conductive polymer composite was always desirable for electromagnetic interference(EMI)shielding applications.In this work,we showcased a novel approach to the superior EMI shielding composite materials by orchestrating the multilayered structure and synergistic system.The asymmetric structure with the carbonyl irons(CI)-rich Ti_(3)C_(2)T_(x)/poly(vinylidene fluoride)(PVDF)magneto-electric layer jointly behind the Ti_(3)C_(2)T_(x) nanosheets filled PVDF layer was designed and fabricated with the aid of a facile but efficient magnetic field-induced method and was then hotpressed into a multilayer structured film.Ti_(3)C_(2)T_(x) nanosheets were excluded by CI agglomeration layer in the asymmetric film to form the complete 3D electrical conductive skeletons.Based on this strategy,EMI shielding properties of the asymmetric multilayer structured composite was superior to the homogeneous blend and sandwiched or alternating layered composites.In addition,an increase in CI content in the composite referred to the thickening of CI-rich layers,making it gain the most powerful EMI SE values,i.e.42.8 d B for DCMP20–10 film(20 wt%CI,10 wt%Ti_(3)C_(2)T_(x))at a thickness of 0.4 mm.More importantly,the composite transformed from a reflection type to an absorption dominating EMI shielding material due to the multireflections and magneto-electric synergism in the CI-rich Ti_(3)C_(2)T_(x)/PVDF layers.Meanwhile,the EMI SE of the composites can be adjusted by increase of either theoverall thickness,or the layer numbers of m-DCMP sheets.The thickness specific EMI SE was calculated as 165.25 d B mm^(-1)for 4-sheet composite film,a record high value among the high efficiency polymer-based EMI shielding materials.This method offered an alternative protocol for preferential integration of excellent EMI shielding performance with high mechanical performance in CPC materials.

关键词： Electromagnetic interference shielding Conductive polymer composites Asymmetric/multilayer structure Magneto-electric synergism

Construction of sub-micron eccentric Ag@PANI particles by interface and redox potential engineering

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Chinese Chemical Letters 2023年第10期34卷 270-274页

作者： Mingming Sun Wei Guo Meiyu Meng qiuyu zhang Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary ConditionsSchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Benefitting from the tunable heterogeneous interface and electronic interaction, metal-polymer-based hybrid composites have attracted wide attention. It is highly desired to develop advanced synthesis methodology and understand the structure-performance relationship. Herein, with the aniline oligomer as the key enabler, we resolve the inferior dynamics issue in the Ag+-aniline reaction system, and successfully fabricate a sub-micron anisotropic eccentric Ag@polyaniline(PANI) particle(an average size up to 340 nm) at room temperature. We demonstrate the synergy mechanism of polyvinyl pyrrolidone and insitu generated PANI for modifying the dynamic reaction interface. We further clarify the H+concentration and the surfactant types serve as main descriptors to tune the reaction dynamics. Besides, by applying other aniline oligomers, a series of similar eccentric structures can also be obtained, indicative of the good applicability of our strategy. Such a sub-micron eccentric structure furnishes the Ag@PANI composites with sound performance for microwave absorption, as demonstrated by a minimum reflection loss(RL) value of-35 d B with an effective absorption bandwidth of 3.7 GHz. This study provides an inspiring scope/concept of eccentric microstructure engineering for better meeting the demands in the high-tech military, energy, environment fields, and beyond.

关键词： Ag@PANI Eccentric particles Redox potential Reaction interface Microwave absorption

The construction of molybdenum disulfide/cobalt selenide heterostructures @ N-doped carbon for stable and high-rate sodium storage

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Journal of Energy Chemistry 2022年第8期31卷 1-11,I0001页

作者： Junjie Chen Mengyun Ling Lingyun Wan Chen Chen Pei Liu qiuyu zhang Baoliang zhang School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710129ShaanxiChina Xi'an Key Laboratory of Functional Organic Porous Materials Northwestern Polytechnical UniversityXi’an 710129ShaanxiChina Shaanxi Engineering and Research Center for Functional Polymers on Adsorption and Separation Sunresins New Materials Co.Ltd.Xi’an 710129ShaanxiChina

Constructing heterostructures is an important approach to develop high-performance anode materials for sodium ion batteries(SIBs).The abundant phase interfaces provide numerous defects and active sites for rapid electron/ion transport.Herein,CoSe_(2)■NC@NC/MoS_(2) heterostructures are prepared through a multi-step reaction strategy,CoSe_(2) nanoparticles served as the coating shells for MoS_(2) cores are anchored in carbon frameworks.The core–shell structure effectively buffers the double volume expansion and inhibits the dissolution of MoS_(2) and CoSe_(2) in the electrolyte.AsSIBs anodes,the heterostructure delivers a high reversible capacity of 481.6 m Ah g^(-1) at 0.5 A g^(-1) after 100 cycles,superior rate capability(174.5 m Ah g^(-1) at 20.0 A g^(-1)),excellent long-term cycle performance(333.4 m Ah g^(-1) after 2000 cycles at 5.0 A g^(-1)).The DFT calculation proves that the electronic distribution of heterostructures is reconstructed with enhanced conductivity.The kinetic analysis,mechanism characterizations and full-cells tests exhibit the synergistic reaction mechanism among different components and practical application prospects.The heterostructure also shows more rapid ions diffusion kinetics than single components.

关键词： Synergistic effect Heterostructures Sodium storage DFT calculation Full-cells

Meta-Analysis:Prevalence of Food Allergy and Food Allergens—China, 2000−2021

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China CDC weekly 2022年第34期4卷 766-770,I0003-I0005页

作者： Jiangzuo Luo qiuyu zhang Yanjun Gu Junjuan Wang Guirong Liu Tao He Huilian Che Key Laboratory of Precision Nutrition and Food Quality Key Laboratory of Functional DairyMinistry of EducationCollege of Food Science and Nutritional EngineeringChina Agricultural UniversityBeijingChina

What is already known about this topic?In recent decades,the prevalence of food allergy has increased worldwide;however,a comprehensive estimate of the prevalence of food allergy and allergens in China is not yet available.What is added by this report?By searching the English databases PubMed,Embase,Cochrane Library,and Chinese databases CNKI,Wanfang Data,and VIP Chinese epidemiological studies on food allergy,the probability of food allergy in China and related influencing factors were determined.What are the implications for public health practice?The findings of this study provide up-to-date estimates of the prevalence of food allergy rates in China in terms of age,gender,and the eight major food allergens.

关键词： has searching gender