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Magnetic nanoparticle-modified hollow double-shell SiC@C@FeCo with excellent electromagnetic wave absorption

Nano Research 2024年第4期17卷 3164-3174页

作者： Guiyu Peng Jintang Zhou Jiaqi Tao Weize Wang Jun Liu Junru yao Yijie Liu zhengjun yao College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics) Ministry of Industry and Information TechnologyNanjing 211100China

Integrated micro and nanostructures,heterogeneous components,defects,and interfaces is the way to develop high-performance microwave absorbing ***,there still needs to be more precise experimental routes and effective *** this work,by a continuous process of vacuum sintering,hydrothermal,and carbon thermal reduction,magnetic FeCo nanoparticles were successfully embedded on the hollow double-shell mesoporous SiC@C surface,thus solving the challenges of a single component loss *** hollow double-shell nanostructure introduces air to enhance impedance matching while significantly reducing the density of the *** extensive defects and heterogeneous grain boundaries effectively enhance the polarization loss *** magnetic loss mechanism introduced by the magnetic particles effectively improves the impedance matching properties of the *** synergy of these multiple advantages has enabled the SCFC_(2)-8(here SiC@C@FeCo is abbreviated to SCFC,2 represents the initial metal ion content,and 8 represents the hydrothermal time)sample to achieve an adequate absorption bandwidth of 6.09 GHz at 2.0 *** a minimum reflection loss of-60.56 dB,the absorption bandwidth can cover the entire C,X,and Ku bands by adjusting the matching thickness(1.3–4.0 mm).This work provides a valuable paradigm for the deeper exploitation of microwave absorption potential and guides the development of other high-performance materials.

关键词： SiC@C@FeCo(SCFC)composites core–shell hollow structure microwave absorption

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Multi-functional and multi-scenario applications for MXene aerogels with synergistically enhanced asymmetric modules

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Nano Research 2024年第4期17卷 3359-3368页

作者： Junru yao Jintang Zhou Feng Yang Guiyu Peng Yijie Liu zhengjun yao Fan Wu Haibo Zeng College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics) Ministry of Industry and Information TechnologyNanjing 211100China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China

The development of multifunctional materials and synergistic applications of various functions are important conditions for integrated and miniaturized ***,we developed asymmetric MXene/aramid nanofibers/polyimides(AMAP)aerogels with different modules using an integrated molding *** asymmetric modules(layered MXene/aramid nanofibers section and porous MXene/aramid nanofibers/polyimides section)interactions are beneficial for enhanced performances,resulting in low reflection electromagnetic interference(EMI)shielding(specific shielding effectiveness of 2483(dB·cm^(3))/g and a low R-value of 0.0138),high-efficiency infrared radiation(IR)stealth(ultra-low thermal conductivity of 0.045 W/(m·K)and IR emissivity of 0.32 at 3–5μm and 0.28 at 8–14μm),and excellent thermal management performances of insulated Joule ***,these multifunctional AMAP aerogels are suitable for various application scenarios such as personal and building protection against electromagnetic pollution and cold,as well as military equipment protection against infrared detection and EMI.

关键词： multifunctional material electromagnetic interference shielding low reflection infrared radiation stealth thermal insulation Joule heating

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Magneto-electric integrated design strategy of NiCo@C composites for synergistic absorption and conversion in mid-high frequency microwaves

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Nano Research 2024年第4期17卷 2205-2215页

作者： Yijie Liu Jintang Zhou Xiaoxuan He Lvtong Duan Yucheng Wang Zhenyu Cheng zhengjun yao College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics) Ministry of Industry and Information TechnologyNanjing 211100China

Achieving synergistic absorption of electromagnetic waves(EMWs)in the mid-high frequency and absorption band conversion is an urgent ***,the present solution is usually a straightforward mixture of magnetic component-carbon ***,we optimize the magnetic properties and electrical relaxation response from a chemical synthesis *** integrated design,the contents of carbon components and multi-dimensional morphology are controlled by retaining strong magnetic *** morphology design and the construction of heterogeneous interfaces will boost the intense response of charge in the surrounding to enhance the polarization *** multi-dimensional structure and electromagnetic(EM)properties of the sample after optimized engineering have an extremely powerful absorption conversion effect on EMW ***@C particles ultimately achieve synergistic absorption effects at low thickness(d<3.5 mm)at middle frequencies(6–10 GHz)and high frequencies(10.5–18 GHz).Our work establishes a correlation mechanism between the physical and chemical properties of materials and EM *** also provides insight into the synergistic absorption of EMWs in the mid-high frequency and absorption band conversion strategies.

关键词： micro-nano composites NiCo@C hollow structure mid-high frequency absorption

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Heterogeneous ZnO@CF structures and their excellent microwave absorbing properties with thin thickness and low filling

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Journal of Materials Science & Technology 2022年第18期113卷 166-174页

作者： Zibao Jiao Wenjun Huyan Junru yao zhengjun yao Jintang Zhou Peijiang Liu College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics) Ministry of Industry and Information TechnologyNanjing 211100China

With the aim to obtain enhanced absorbing performance at small thickness and low filling,a robust strat-egy to fabricate zinc oxide(ZnO)modified carbon fiber(CF)structures have been successfully prepared by using low temperature hydrothermal *** to the multi-interface polarization caused by the high specific surface area of the complex heterostructures and the improvement of impedance matching,the composites show excellent electromagnetic wave absorption *** the condition of low filling content(20 wt%)and ultra-thin thickness(1.5 mm),the excellent absorption performance of minimal reflection loss of−34.4 dB and an effective absorption bandwidth(RL≤−10 dB)of 4.94 GHz is *** addition,the effective absorption bandwidth covers the whole 2-18 GHz band with the increase of thickness from 0.5 to 10 *** work provides an innovative method for designing the matching layer of carbon-based absorbing materials,and ZnO@CF heterostructure is expected to become a potential absorbing material.

关键词： Heterogeneous structure Carbon fiber Impedance matching characteristic Electromagnetic wave absorption

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Achieving Ultra-Wideband and Elevated Temperature Electromagnetic Wave Absorption via Constructing Lightweight Porous Rigid Structure

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Nano-Micro Letters 2022年第11期14卷 33-47页

作者： Zibao Jiao Wenjun Huyan Feng Yang Junru yao Ruiyang Tan Ping Chen Xuewei Tao zhengjun yao Jintang Zhou Peijiang Liu College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100People’s Republic of China Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics) Ministry of Industry and Information TechnologyNanjing 211100People’s Republic of China School of Electronic Science and Engineering Nanjing UniversityNanjing 210023People’s Republic of China School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167People’s Republic of China

Realizing ultra-wideband absorption,desirable attenuation capability at high temperature and mechanical requirements for real-life applications remains a great challenge for microwave absorbing ***,we have constructed a porous carbon fiber/polymethacrylimide(CP)structure for acquiring promising microwave absorption performance and withstanding both elevated temperature and high strength in a low *** the ability of porous structure to induce desirable impedance matching and multiple reflection,the absorption bandwidth of CP composite can reach ultra-wideband absorption of 14 GHz at room temperature and even cover the whole X-band at 473 ***,the presence of imide ring group in polymethacrylimide and hard bubble wall endows the composite with excellent heat and compressive ***,the lightweight of the CP composite with a density of only 110 mg cm^(−3) coupled with high compressive strength of 1.05 MPa even at 453 K also satisfies the requirements in engineering *** with soft and compressible aerogel materials,we envision that the rigid porous foam absorbing material is particularly suitable for environmental extremes.

关键词： Porous structure EM wave absorption Mechanism

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基础科学的科普新表达——中国科技馆第二期“论道科普”展览创新沙龙活动侧记

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自然科学博物馆研究 2024年第2期9卷 83-87页

作者：崔胜玉唐罡闫卓远腰正君范亚楠中国科技馆北京市100101 中国科技馆展览设计中心北京市100101

2024年3月22日,第二期“论道科普”展览创新沙龙活动在中国科技馆成功举办。沙龙活动围绕“基础科学的科普新表达”主题展开,来自科技史、科学教育、基础科学研究、科学传播等领域专家,通过深入的讨论和交流,分享不同视角下基础科学展... 详细信息

2024年3月22日,第二期“论道科普”展览创新沙龙活动在中国科技馆成功举办。沙龙活动围绕“基础科学的科普新表达”主题展开,来自科技史、科学教育、基础科学研究、科学传播等领域专家,通过深入的讨论和交流,分享不同视角下基础科学展览创作的新方向、新思路,为新时代背景下的基础科学展览创新研发注入新活力、探索新路径、开辟新领域。

关键词：基础科学科技馆展览创新

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Two-Dimensional Materials in Large-Areas: Synthesis, Properties and Applications

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Nano-Micro Letters 2020年第5期12卷 119-152页

作者： Ali Zavabeti Azmira Jannat Li Zhong Azhar Ali Haidry zhengjun yao Jian Zhen Ou College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100People’s Republic of China Department of Chemical Engineering The University of MelbourneParkvilleVIC 3010Australia School of Engineering RMIT UniversityMelbourneVIC 3000Australia

Large-area and high-quality two-dimensional crystals are the basis for the development of the next-generation electronic and optical *** synthesis of two-dimensional materials in wafer scales is the first critical step for future technology uptake by the industries;however,currently presented as a significant *** efforts have been devoted to producing atomically thin two-dimensional materials with large lateral dimensions,controllable and uniform thicknesses,large crystal domains and minimum *** this review,recent advances in synthetic routes to obtain high-quality two-dimensional crystals with lateral sizes exceeding a hundred micrometres are *** of the achieved large-area two-dimensional crystals in electronics and optoelectronics are summarised,and advantages and disadvantages of each approach considering ease of the synthesis,defects,grain sizes and uniformity are discussed.

关键词： Two-dimensional materials Large-area Electronics Optoelectronics Defect engineering

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电子束重熔对铁基粉末冶金表面耐磨性能的影响

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材料导报 2022年第17期36卷 158-162页

作者：杨海屹张莎莎姚正军刘子利南京航空航天大学材料科学与技术学院南京210000 面向苛刻环境的材料制备与防护技术工业和信息化部重点实验室南京210000

通过电子束对铁基粉末冶金制品的表面进行重熔处理,以达到提高表面硬度和耐磨性的目的。结果表明:经过电子束重熔处理后,铁基粉末冶金制品表面组织发生了转变,逐步从奥氏体+珠光体转变为针状马氏体+残余奥氏体。当电流为8 mA时,因为组... 详细信息

通过电子束对铁基粉末冶金制品的表面进行重熔处理,以达到提高表面硬度和耐磨性的目的。结果表明:经过电子束重熔处理后,铁基粉末冶金制品表面组织发生了转变,逐步从奥氏体+珠光体转变为针状马氏体+残余奥氏体。当电流为8 mA时,因为组织未能完全熔化,所以仍会有较多奥氏体存在;当电流增大至9 mA时,组织将完全转变为马氏体和残余奥氏体,且随着电流的继续增大,组织中残余奥氏体的含量也逐渐降低。电子束重熔处理能有效地降低铁基粉末冶金制品表面的孔隙率,并促使组织发生马氏体转变,从而提高表面耐磨性能、降低磨损率。同时,随着电流的增大,样品表面耐磨性能逐渐提升。

关键词：电子束重熔粉末冶金耐磨性硬度

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职业教育在实现共同富裕中的“可为”与“作为”

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职教发展研究 2022年第3期 42-48页

作者：姚正军南京邮电大学通达学院后勤管理处江苏扬州225127

实现共同富裕一直都是中华民族对社会发展图景的设想与追求。新时代的共同富裕是所有成员与所有要素的全面富裕,是物质富裕和精神富裕的整体融合,是共同参与和平等共享的统一,也是主观能动性与客观现实性的统一。职业教育在实现共同富... 详细信息

实现共同富裕一直都是中华民族对社会发展图景的设想与追求。新时代的共同富裕是所有成员与所有要素的全面富裕,是物质富裕和精神富裕的整体融合,是共同参与和平等共享的统一,也是主观能动性与客观现实性的统一。职业教育在实现共同富裕方面具有独特优势:可以通过赋能乡村振兴推动城乡协调发展,可以通过技术技能培训增强人人参与的可能性,可以构筑人们的精神家园,可以通过对创新创业能力的培育为“人人出彩”提供保障。职业教育在实现共同富裕过程中要发挥自身价值,需要构建以党组织为核心的协同治理机制,增强职业教育在实现共同富裕过程中的引领力;需要通过完善职业教育和其他类型教育的共生融通机制,促进地方经济的高质量发展;需要通过引导城乡要素的双向嵌入来激活城乡融合共同体的内源性活力。

关键词：职业教育共同富裕职业教育价值

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Laser Cladding Fe-Al-Cr Coating with Enhanced Mechanical Properties

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Journal of Wuhan University of Technology(Materials Science) 2019年第5期34卷 1197-1204页

作者：罗西希姚正军 ZHANG Pingze GU Dongdong CHEN Yu School of Materials Engineering Xi'an Aeronautical UniversityXi'an 710077China College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China School of Business and Trade Nanjing Institute of Industry TechnologyNanjing 210046China

Dense Fe-Al-Cr coatings with approximately 50 μm in thickness are successfully prepared on the 1045 carbon steel substrates via a laser cladding process. Proper Cr content(5 at% Cr) will lead to decrease in the melting point, and improves the viscosity of the liquid and the nucleation rate of the molten pool, leading to refining grains of the solidification structure. As a result, the Fe-29 Al-5 Cr laser cladding layer exhibits the best hardness, plasticity properties, and wear resistance at 400 °C. Excessive Cr for the Fe-29 Al-7.5 Cr coating leads to the formation of Cr2 Al in the grain boundaries and thermal vacancies during the solidification process, resulting in inferior mechanical properties and poor tribological behavior.

关键词： Fe-Al-Cr intermetallic alloys and compounds laser processing mechanical properties nanoindentation

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