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High-Efficiency Electromagnetic Interference Shielding of rGO@FeNi/Epoxy Composites with Regular honeycomb structures

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Nano-Micro Letters 2022年第3期14卷 244-256页

作者： Ping Song Zhonglei Ma Hua Qiu Yifan Ru Junwei Gu Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China Queen Mary University of London Engineering School Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China

With the rapid development of fifth-generation mobile com-munication technology and wearable electronic devices,electromagnetic interference and radiation pollution caused by electromagnetic waves have attracted worldwide attention.Therefore,the design and development of highly efficient EMI shielding materials are of great importance.In this work,the three-dimensional graphene oxide(GO)with regular honeycomb structure(GH)is firstly constructed by sacrificial template and freeze-dry-ing methods.Then,the amino functionalized FeNi alloy particles(f-FeNi)are loaded on the GH skeleton followed by in-situ reduction to prepare rGH@FeNi aerogel.Finally,the rGH@FeNi/epoxy EMI shielding com-posites with regular honeycomb structure is obtained by vacuum-assisted impregnation of epoxy resin.Benefitting from the construction of regular honeycomb structure and electromagnetic synergistic effect,the rGH@FeNi/epoxy composites with a low rGH@FeNi mass fraction of 2.1 wt%(rGH and f-FeNi are 1.2 and 0.9 wt%,respectively)exhibit a high EMI shielding effectiveness(EMI SE)of 46 dB,which is 5.8 times of that(8 dB)for rGO/FeNi/epoxy composites with the same rGO/FeNi mass fraction.At the same time,the rGH@FeNi/epoxy composites also possess excellent thermal stability(heat-resistance index and temperature at the maximum decomposition rate are 179.1 and 389.0°C respectively)and mechanical properties(storage modulus is 8296.2 MPa).

关键词： Electromagnetic interference shielding rGO@FeNi Epoxy resins honeycomb structures

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Topological study about failure behavior and energy absorption of honeycomb structures under various strain rates

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Defence Technology（防务技术） 2023年第6期24卷 214-227页

作者： Yu-chen Wei Meng-jie Tian Chun-yang Huang Shao-wu Wang Xing Li Qian-ran Hu Meng-qi Yuan State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100036China Chongqing Innovation Center Beijing Institute of TechnologyChongqing400044China State Grid Anhui Electric Power Research Institute Hefei230601China

High-speed impact threats and terrorist actions on the battlefield require the development of more effective protective materials and structures,and various protective structure is designed according their energy-absorbing characteristics.In this research,the deformation behavior,microscopic failure modes and energy absorption characteristics of re-entrant hexagonal structure,regular hexagonal structure and regular quadrilateral structure are studied under different strain rates impact.The re-entrant hexagonal structure forms a“X”-shaped deformation zone,the regular quadrilateral and regular hexagonal structure form an“I”-shaped deformation zone.The microscopic appearance of the section is a mixed fracture form.The effects of the topological shape,cell angle,and cell height on the impact behavior of the structure were evaluated.When the cell height is fixed and the cell angle is changed,the energy absorption of the structure increase and then decrease as the relative density increase.The mechanical properties of the structure are optimal when the relative density is about 18.6%and the cell angle is22.5°.When the cell angle is fixed and the cell height is changed,as the relative density increases,the energy absorption of the structure gradually increases.The regular quadrilateral structure and the reentrant hexagonal structure experienced clear strain rate effects under dynamic impact conditions;the regular hexagonal structure did not exhibit obvious strain rate effects.The results presented herein provide a basis for further rational design and selection of shock-resistant protective structures that perform well in high-speed impact environments.

关键词： honeycomb structures Impact loading Negative Poisson's ratio Titanium alloy Dynamic response

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honeycomb structures of Metal Ions to Cucurbit[8]uril

Honeycomb Structures of Metal Ions to Cucurbit[8]uril

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全国第十六届大环化学暨第八届超分子化学学术讨论会

作者： Xiao-iie Cheng Li-Li Liang Yi Zhao Xin Xiao Qian-Jiang Zhu Sai-Feng Xue Zhu Tao Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province Guizhou University

Cucurbit[n]uril(Q[n])-based coordination chemistry is an important area in the cucurbit[n]uril chemistry due to the novel structure of Q[n]s which could interact with various metal ions.In the present works,two similar Q[8]-based honeycomb supramolecular structures are demonstrated.A overall view of the supramolecular assemblies of the Ce-Q[8]-[CdCl]systems and Sr-Q[8]-[SrCl]systems are all the honeycomb-like structures(Fig.la,c).As can be seen,the one-dimensional supramolecular chains are

关键词： cucurbituril metal ions honeycomb structures

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Modeling of Heat Conduction in Thermoplastic honeycomb Core/Face Sheet Fusion Bonding

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Chinese Journal of Aeronautics 2009年第6期22卷 685-690页

作者： Fan Xinyu Li Yubin Li Juan Yan Chun Li Ke Key Lab of Polymer Materials Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100191 China Xi'an Long Technology & Development Co. Ltd Xi'an 710075 China

honeycomb sandwich materials have been widely used in aerospace industry as secondary structural materials or interior panels. Recently the research of full thermoplastic honeycomb sandwich materials has been of interest due to their recyclability. In their production, they usually demand an adhesive-free process, namely fusion bonding, to connect thermoplastic honeycomb core and face sheets. It is a heat induced process where a parameter of temperature should be well controlled to guarantee the product quality. This article presents a mathematical model of heat conduction to analyze the transient temperature distribution from heating tools towards inner part of the core under fusion bonding conditions. In order to simplify the complexity of 3D honeycomb geometry, a homogenization method is used to obtain average thermal properties of the honeycomb along the major heat flux direction. The model is validated by comparing with the results of in-situ temperature measurement during fusion bonding. The presented model can also be applied to analyzing general out-of-plane heat conduction through honeycomb sandwich structures made from other materials.

关键词： honeycomb structures heat conduction homogenization method welding

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Electrical Control of Edge Magnetism in Two-Dimensional Buckled honeycomb Lattice

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Chinese Physics Letters 2014年第9期31卷 144-147页

作者：鲍伟成邹良剑 Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 Department of Physics University of Science and Technology of China Hefei 230026

We theoretically study indirect spin coupling strength between two magnetic impurities located on honeycomb Kane-Mele zigzag ribbon （KMZR） with periodic and open boundary （PB and OB）. We show that spin interaction J in PB ribbons displays an AFM-FM oscillating behavior with increasing the staggered potential and electron density, and approaches to maximum at the edges. While the spin coupling in OB KMZR shows a trivial smooth AFM coupling with varying staggered potential. Such a novel J（ A） behavior is the combining effect of finite size, topological edge states and inversion symmetry breaking induced by the staggered potential. We propose that one could control the edge magnetism electrically in two-dimensional buckled honeycomb materials, e.g., silicence, germanene and stanene.

关键词： honeycomb structures

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ANALYSIS OF SHEAR STRESS DISTRIBUTION IN honeycomb AIRCRAFT WING STRUCTURE SUBJECTED TO (S.T.) TORQUE

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Chinese Journal of Aeronautics 1997年第3期10卷 23-28页

作者： Khalid M. Tahir, Zhang Xing (Department of Flight Vehicle Design & Structural Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100083, China)

Using the method of elasticity, an analytical approach is developed to analyze the shear stress in a honeycomb wing structure with a large aspect ratio under the condition of free torsion. The formulas of shear stress, warping and angle of twist are derived. These formulas are both useful and convenient from the point of view in the structure design.

关键词： honeycomb structures wings shear stress free torsion analytical method

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