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Multi-dimensional Ni@C-CoNi composites with strong magnetic interaction toward superior microwave absorption

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Journal of Materials Science & Technology 2022年第35期130卷 176-183页

作者： Mengxiao Sun Derong Wang Ziming Xiong Zhongwei Zhang Long Qin Chaochan Chen Fan Wu panbo Liu School of Mechanical Engineering Nanjing University of Science&TechnologyNanjing 210094China State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjing 210007China Division of Electron and Electricity Measurement Technology Shanghai Institute of Measurement and Testing TechnologyShanghai 201203China School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710129China School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China

Dielectric-magnetic integrated absorbers have attracted arousing attention in microwave absorption,however,it still remains a great challenge to simultaneously achieve superior dielectric polarization and strong magnetic ***,we propose a multi-scale structure optimization strategy to anchor CoNiMOFs derived OD CoNi alloy onto 1 D core-shell Ni@C *** decorating with the poly-dopamine layer,the connection between 1 D NiO and CoNi-MOFs precursors was greatly improved via the electrostatic *** from the overlapping conductive networks,enhanced interfacial polarization among the multi-dimensional heterogeneous interfaces and strong magnetic interaction,the fabricated multi-dimensional Ni@C-CoNi composites exhibit outstanding microwave ***,the optimal reflection loss is as high as-51.4 dB at 1.9 mm,and the effective absorption bandwidth achieves 4.6 GHz with a thickness of only 1.3 *** multi-scale structure optimization strategy inspires us with an efficient method to fabricate ideal microwave absorbers and the obtained multi-dimensional composites can be used as promising candidates in electromagnetic radiation protection.

关键词： Multi-dimensional composites Synergistic effect Magnetic interaction Microwave absorption

A review of the technology and applications of methods for evaluating the transport of air pollutants

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Journal of Environmental Sciences 2023年第1期123卷 341-349页

作者： Xiaoqi Wang Shuiyuan Cheng Ying Zhou Hanyu Zhang panbo Guan Zhida Zhang Weichao Bai Wujun Dai Key Laboratory of Beijing on Regional Air Pollution Control Beijing University of TechnologyBeijing 100124China School of Ecology and Environment Beijing Technology and Business UniversityBeijing 100048China State Environmental Protection Key Laboratory of Food Chain Pollution Control Beijing Technology and Business UniversityBeijing 100048China

A variety of methods based on air quality models,including tracer methods,the bruteforce method(BFM),decoupled direct method(DDM),high-order decoupled direct method(HDDM),response surface models(RSMs)and so on forth,have been widely used to study the transport of air *** methods have good applicability for the transport of air pollutants with simple formation ***,differences in research conclusions on secondary pollutants with obvious nonlinear characteristics have been *** example,the tracer method is suitable for the study of simpli?ed scenarios,while HDDM and RSMs are more suitable for the study for nonlinear *** observation techniques,including conventional air pollutant observation,lidar observation,air sounding balloons,vehicle-mounted and ship-borne technology,aerial surveys,and remote sensing observations,have been utilized to investigate air pollutant transport characteristics with time resolution as high as 1 *** addition,based on a multi-regional input-output model combined with emission inventories,the transfer of air pollutant emissions can be evaluated and applied to study the air pollutant transport *** technologies have advantages in temporal resolution and accuracy,while modeling technologies are more?exible in spatial resolution and research plan *** order to accurately quantify the transport characteristics of pollutants,it is necessary to develop a research method for interactive veri?cation of observation and *** evaluation of the transport of air pollutants from different angles can provide a scienti?c basis for regional joint prevention and control.

关键词： Air pollutant transport Simulation technology Observation technology Transport matrix Transport?ux

MoS_(2)-Decorated/Integrated Carbon Fiber:Phase Engineering Well-Regulated Microwave Absorber

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Nano-Micro Letters 2021年第7期13卷 173-187页

作者： Jing Yan Ying Huang Xiangyong Zhang Xin Gong Chen Chen Guangdi Nie Xudong Liu panbo Liu MOE Key Laboratory of Material Physics and Chemistry Under Extraodinary Conditions School of Chemistry and Chemical Engineering Ministry of EducationNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China School of Materials Science and Engineering Central South UniversityChangsha 410083People’s Republic of China Institute of Flexible Electronics Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China Industrial Research Institute of Nonwovens and Technical Textiles College of Textiles and ClothingQingdao UniversityQingdao 266071People’s Republic of China

Phase engineering is an important strategy to modulate the electronic structure of molybdenum disulfide(MoS_(2)).MoS_(2)-based composites are usually used for the electromagnetic wave(EMW)absorber,but the effect of different phases on the EMW absorbing performance,such as 1T and 2H phase,is still not *** this work,micro-1T/2H MoS_(2) is achieved via a facile one-step hydrother-mal route,in which the 1T phase is induced by the intercalation of guest molecules and *** EMW absorption mechanism of single MoS_(2) is revealed by presenting a comparative study between 1T/2H MoS_(2) and 2H MoS_(2).As a result,1T/2H MoS_(2) with the matrix loading of 15%exhibits excellent microwave absorption property than 2H MoS_(2).Furthermore,taking the advantage of 1T/2H MoS_(2),a flexible EMW absorbers that ultrathin 1T/2H MoS_(2)grown on the carbon fiber also performs outstanding performance only with the matrix loading of 5%.This work offers necessary reference to improve microwave absorption performance by phase engineering and design a new type of flexible electromagnetic wave absorption material to apply for the portable microwave absorption electronic devices.

关键词： Phase engineering Electromagnetic wave absorber 1T/2H MoS_(2) 2H MoS_(2) Flexible film

Size-Dependent Oxidation-Induced Phase Engineering for MOFs Derivatives Via Spatial Confinement Strategy Toward Enhanced Microwave Absorption

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Nano-Micro Letters 2022年第6期14卷 294-307页

作者： Hanxiao Xu Guozheng Zhang Yi Wang Mingqiang Ning Bo Ouyang Yang Zhao Ying Huang panbo Liu School of Chemistry and Chemical Engineering μNorthwestern Polytechnical UniversityXi’an 710129People’s Republic of China Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo 315201People’s Republic of China MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing Nanjing University of Science and TechnologyNanjing 210094People’s Republic of China Department of Mechanical and Materials Engineering University of Western OntarioLondonON N6A 5B9Canada

Precisely reducing the size of metal-organic frameworks(MOFs)derivatives is an effective strategy to manipulate their phase engineering owing to size-dependent oxidation;however,the underlying relationship between the size of derivatives and phase engineering has not been clarified so ***,a spatial confined growth strategy is proposed to encapsulate small-size MOFs derivatives into hollow carbon *** realizes that the hollow cavity shows a significant spatial confinement effect on the size of confined MOFs crystals and subsequently affects the dielectric polarization due to the phase hybridization with tunable coherent interfaces and heterojunctions owing to size-dependent oxidation motion,yielding to satisfied microwave attenuation with an optimal reflection loss of-50.6 d B and effective bandwidth of 6.6 ***,the effect of phase hybridization on dielectric polarization is deeply visualized,and the simulated calculation and electron holograms demonstrate that dielectric polarization is shown to be dominant dissipation mechanism in determining microwave *** spatial confined growth strategy provides a versatile methodology for manipulating the size of MOFs derivatives and the understanding of size-dependent oxidation-induced phase hybridization offers a precise inspiration in optimizing dielectric polarization and microwave attenuation in theory.

关键词： Size-dependent oxidation Phase engineering Coherent interface Dielectric polarization Electron holography

Hollow engineering of sandwich NC@Co/NC@MnO_(2)composites toward strong wideband electromagnetic wave attenuation

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Journal of Materials Science & Technology 2024年第8期175卷 194-203页

作者： Chenhao Wei Lingzi Shi Maoqing Li Mukun He Mengjie Li Xinrui Jing panbo Liu Junwei Gu Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Coal Chemical Industry Technology Research Institute Co. Ltd.Xi’an 710123China

Multiple hetero-interfaces would strengthen interfacial polarization and boost electromagnetic wave absorption,but still remain the formidable challenges in decreasing filler ***,sandwich NC@Co/NC@MnO_(2)composites with hollow cavity,multiple hetero-interfaces,and hierarchical structures have been fabricated via the cooperative processes of self-sacrifice strategy and sequential hydrothermal *** the sandwich composites,middle magnetic components(Co/NC)are wrapped by inner N-doped carbon(NC)matrix and outer hierarchical MnO_(2)***,hollow engineering of sandwich composites with multiple hetero-interfaces greatly facilitates the enhancement of absorption bandwidth without sacrificing the absorption *** maximum reflection loss of sandwich NC@Co/NC@MnO_(2)composites reaches-44.8 dB at 2.5 mm and the effective bandwidths is achieved as wide as 9.6 GHz at 2.3 *** results provide us a new insight into preparing efficient electromagnetic wave absorbers by interface engineering and hollow construction.

关键词： Interface engineering Sandwich structure Hetero-interfaces Interfacial polarization Electromagnetic wave absorption

Heterogeneous junctions of magnetic Ni core@binary dielectric shells toward high-efficiency microwave attenuation

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Journal of Materials Science & Technology 2022年第20期115卷 71-80页

作者： Jijun Wang Songlin Yu Qingqing Wu Yan Li Fangyuan Li Xiao Zhou Yuhua Chen Bingzhen Li panbo Liu Institute of Defense Engineering Academy of Military SciencesBeijing 100036China School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710129China

Metal-organic-frameworks(MOFs)derived carbon-based composites with balanced impedance matching and synergistic dielectric/magnetic loss are considered as promising microwave *** the aim to promote interfacial polarization,herein,heterogeneous junctions composed of magnetic Ni core and binary dielectric shells(C and PEDOT)are synthesized by annealing Ni-MOFs precursors and an in-situ polymerization strategy,forming Ni@C@PEDOT spheres with multilayer heterogeneous *** results indicate that the final absorption attenuation is sensitive to the thickness of the dielectric PEDOT layer,when the thickness of the PEDOT layer is 224 nm,an optimal reflection loss of-72.4 d B is achieved at 2 mm and the effective absorption bandwidth reaches 6.4 GHz with a thickness of only 1.85 mm,the excellent absorption attenuation is accredited to the promoted impedance matching,enhanced conduction loss as well as the synergistic interfacial polarization induced by magnetic core and binary dielectric ***,this work offers a simple and significant strategy in preparation for ideal microwave absorbers by rational design of multilayer heterogeneous interfaces.

关键词： Metal-organic-frameworks Core-shell structure Conductive polymer Microwave absorption

Hierarchical construction of CNT networks in aramid papers for high-efficiency microwave absorption

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Nano Research 2023年第5期16卷 7801-7809页

作者： You Wu Li Chen Yixuan Han panbo Liu Haihong Xu Guanze Yu Yingying Wang Tao Wen Wenbo Ju Junwei Gu School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China School of Light Industry and Engineering South China University of TechnologyGuangzhou 510640China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China School of Emergent Soft Matter South China University of TechnologyGuangzhou 510640China

Carbon nanotubes(CNTs)incorporated polymeric composites have been extensively investigated for microwave absorption at target frequencies to meet the requirement of radar cross-section *** this work,a strategy of efficient utilization of CNT in producing CNT incorporated aramid papers is *** layer-by-layer self-assembly technique is used to coat the surfaces of meta-aramid fibers and fibrils with CNT,providing novel raw materials available for the large-scale *** hierarchical construction of CNT networks resolves the dilemma of increasing CNT content and avoiding the agglomeration of CNT,which is a frequent challenge for CNT incorporated polymeric *** composite paper,which contains abundant heterogeneous interfaces and long-range conductive networks,is capable of reaching a high permittivity and dielectric loss tangent at a low CNT loading,its complex permittivity is,so far,adjustable in the range of(1.20−j0.05)to(25.17−j18.89)at 10 *** papers with optimal matching thicknesses achieve a high-efficiency microwave absorption with a reflection loss lower than−10 dB in the entire X-band.

关键词： layer-by-layer self-assembly aramid fiber carbon nanotube(CNT) composite paper radar absorbing materials

Effect of Soliton Propagation in Fiber Amplifiers

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Semiconductor Photonics and Technology 2001年第4期7卷 241-246页

作者： SHENTin－gen panbo 等 PhotoelectricCenterLab.ofJiangsuprovince NanjingNormalUniversityNanjing210097 Dept.ofPhys. JiangsuUniversityZhenjiag212003CHN

The propagation of optical solitons in fiber amplifiers is discussed by considering a model that includes linear high order dispersion, two photon absorption, nonlinear high order dispersion, self induced Ramam and five order nonlinear effects. Based on travelling wave method, the solutions of the nonlinear Schr dinger equations, and the influence on soliton propagation as well as high order effect in the fiber amplifier are discussed in detail. It is found that because of existing five order nonlinear effect, the solution is not of secant hyperbola type, but shows high gain state of the fiber amplifier which is very favourable to the propagation of solitons.

关键词： High order effect Soliton propagation Fiber amplifiers Travelling wave method

Maintenance Therapy and Prospects for Inflammatory Bowel Disease

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世界感染杂志 2003年第2期3卷 85-90页

作者： XUChang-tai panbo-rong GUOXiue-gan EditarialDepartmentoftheJournal FourthMilitaryMedicalUniversity GastroenterologyCenter OncologyCenterofXijingHospital.FourthMilitaryMedicalUniversity Xi‘an710032 China

Medical therapy of inflammatory bowel disease (IBD) can be considered in several subcategories, and this review is designed to provide selective updates for some of the most important therapeutic entities currently marketed or soon to be available for the medical management of IBD^[1-6]. Although conventi onal corticosteroids have been a major component of acute inflammatory bowel disease management,

关键词：治疗肠疾病预防护理