检索结果-南通市图书馆

Journal of Materials Science & Technology 2023年第13期144卷 81-92页

作者： Siyuan Zhang Jinlei Tao Rui Sun Shipeng Hu Jian Jiao Northwestern Polytechnical University Xi’an 710072China

Excellent impedance matching and high conduction loss are important factors for the preparation of high-performance electromagnetic wave(EMW)absorbing materials,but these two properties are of-ten *** this work,three absorbers with unique hollow structures,H-Ag/CuO@CuS,H-O-Ag/CuO@CuS,and H-P-Ag/CuO@CuS,are designed and synthesized by adopting hollow CuO@CuS with double shell as carrier and silver nitrate as the structural *** more voids coming from hol-low structures,window-opened structures,and stacked pores improve the impedance matching of these absorbers,and the introduction of elemental Ag effectively regulates the conduction ***,a balance between impedance matching and conduction loss is achieved to improve the reflection loss(RL)value and broadens the absorbing band of the *** comparison to H-Ag/CuO@CuS and H-O-Ag/CuO@CuS(hollow structure with open window)in which elemental Ag is uniformly dispersed in the CuO layer,H-P-Ag/CuO@CuS exhibits more excellent EMW absorption performance due to more voids and an optimized conductive network arising from Ag/CuO pieces distributed between the hol-low Ag/CuO@CuS particles and Ag distributed in the CuS *** the thickness is 2.3 mm,H-P-Ag/CuO@CuS provides an ultra-wide electromagnetic absorption band of 8.56 GHz(9.44-18 GHz),in which the RLloss of-41 dB.

关键词： Elemental sliver Impedance matching conduction loss Electromagnetic wave absorption

Unique electromagnetic wave absorber for three-dimensional framework engineering with copious heterostructures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第3期170卷 129-139页

作者： Liyuan Yu Qianqian Zhu Zhiqiang Guo Yuhang Cheng Zirui Jia Guanglei Wu Institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China

In order to obtain high-performance electromagnetic wave absorbers,the adjustment of structure and components is *** on the above requirements,this system forms a three-dimensional frame structure consisting of MXene and transition metal oxides(TMOs)through efficient electrostatic *** three-dimensional network structure has rich heterojunction structures,which can cause a large amount of interface polarization and conduction losses in incident electromagnetic *** structures cause multiple reflections and scattering of electromagnetic waves,which is also an important reason for further increasing electromagnetic wave *** the doping ratio is 1:1,the system has the best impedance matching,the maximum effective absorption bandwidth(EAB max)can reach 5.12 GHz at 1.7 mm,and the minimum reflection loss(RL_(min))is-50.30 dB at 1.8 *** provides a reference for the subsequent formation of 2D-MXene materials into 3D materials.

关键词： MXene Three-dimensional frame Heterojunction structure conduction loss Electromagnetic wave absorption

3D carbon network supported porous SiOC ceramics with enhanced microwave absorption properties

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第19期54卷 223-229页

作者： Chen Chen Sifan Zeng Xiaochun Han Yongqiang Tan Wanlin Feng Huahai Shen Shuming Peng Haibin Zhang Innovation Research Team for Advanced Ceramics Institute of Nuclear Physics and ChemistryChina Academy of Engineering PhysicsMianyang621900China

Porous SiOC ceramic was successfully prepared by pyrolysis of dimethylsilicone oil,silane coupling agent and melamine *** microwave absorbing properties of porous SiOC were studied for the first *** the matching layer thickness of 3.0 mm,the paraffin-based composite with porous SiOC displays a minimum reflection coefficient(RC)of-39.13 d B(11.76 GHz)and an effective absorption bandwidth(EAB)of 4.64 GHz which are much larger than that of paraffin-based composite with ordinary *** is found that the porous structure of SiOC is crucial to achieve its high microwave absorption performance by improving both the polarization loss and conduction *** enhanced polarization loss is originated from the dipole polarization and interfacial polarization,while the improvement of conduction loss is attributed to the carbon skeleton of porous *** results indicate that porous SiOC ceramic is a promising candidate for high-performance ceramic-based microwave absorbing materials.

关键词： Porous structure Polarization loss conduction loss Dipole polarization Interfacial polarization

Simultaneous optimization of conduction and polarization losses in CNT@NiCo compounds for superior electromagnetic wave absorption

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第35期166卷 34-46页

作者： Yongpeng Zhao Zhicheng Lin Li Huang Zitong Meng Hao Yu Xin Kou Zhiyong Zou Peng Huang Yuchao Wang Ding Xi Pengfei Yin Gehong Su Zhiqiang Fan Zhiping Su Dongbei Xu Lujun Pan Lijia Xu College of Mechanical and Electrical Engineering Sichuan Agricultural UniversityYa’an 625000China School of Education Northwest Normal UniversityLanzhou 730000China College of Graduate Sichuan Agricultural UniversityChengdu 610000China College of Science Sichuan Agricultural UniversityYa’an 625000China College of Agriculture Sichuan Agricultural UniversityChengdu 610000China School of Physics Dalian University of TechnologyDalian 116024China

Polarization and conduction losses are the two most crucial dielectric loss mechanisms for carbon-based composites,but their synergistic effects in different frequency bands need to be further *** importantly,for polarization and conduction losses,the strengthening of one party always comes at the expense of the other,which inevitably limits the overall performance of the ***,we have developed a composite of CNT and NiCo hybrid particles via a scalable wet chemical process and an-nealing *** the adjustment of the precursor and the annealing temperature,the conduction and polarization losses of the composite are optimized *** optimized samples achieved the full absorption of the X and Ku bands under conditions of low filling rate and thin *** theoretical and experimental studies have revealed conduction loss and polarization loss laws at different frequency *** synergistic effect of conductive loss and magnetic loss in the low-frequency region ensures that the sample exhibits high microwave dissipation ***,in the medium and high-frequency part,the magnetic loss can be almost ignored and the timely replenishment of polar-ization loss keeps the wave-absorbing performance at a high *** excellent multi-band absorption characteristics make the as-obtained absorbers meet the needs of future applications.

关键词： CNT@NiCo compounds conduction loss Polarization loss Electromagnetic wave absorption

Supramolecular self-assembly of nickel（Ⅱ）-substituted α-Keggin-type polyoxometalate and polyaniline coated Fe2O3 hollow nanospindle for microwave absorption application

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2021年第3期31卷 387-397页

作者： Na Zhang Puzhen Chen Weixing Chen Hongli Zhang Yan Wang School of Materials and Chemical Engineering Xi'an Technological University

A general strategy has been developed here to supramolecular self-assembly of nickel（Ⅱ）-substituted α-Keggintype polyoxometalate and polyaniline coated Fe2O3hollow nanospindle(Fe2O3hollow nanospindle@PANI/α-SiW11Ni composites) via electrostatic attraction and hydrothermal ***3+was first hydrolyzed and polymerized into Fe2O3,then dissolved into [Fe（H2PO4）x]3-x,resulting in hollow *** polyoxometalate existed in polyaniline as a proton-doped counter-ion form,rather than as a separate crystalline *** protons and anions entered the PANI main chain and combined with N atoms of amines and imines on the PANI chain((-NH·+=)/α-[SiW11Ni（H2O）O39]6-) to form poles and bipolar delocalization into π bonds of the whole polyaniline molecular chain,which leaded to conductance and *** Fe2O3hollow nanospindle@PANI/α-SiW11Ni composites were proven to be excellent microwave absorber in terms of reflection loss（RL） and *** maximum RLvalue was up to-53.6 dB at 3.5 mm and 6.9 *** broadest absorption bandwidth exceeding-10 dB was 6.3 GHz at a thickness of only 1.9 ***,the ternary composites presented obvious multi-band absorption with the matching thickness range of 1.5-5 *** absorption peaks bandwidth reached as wide as 14.3 GHz,which included all C-Ku *** hollow and core-shell structures could provide non-uniform interface for the induced polarization loss and space for the reflecting and scattering of *** carrier,pair-ion carrier and hydrogen bond network could lead to conduction *** magnetic losses were caused by eddy current effect and natural *** work can lay a theoretical foundation for the design and performance regulation of new absorbing materials.

关键词： Microwave absorption Electrostatic attraction conduction loss Impedance matching Attenuation

A Two-Dimensional Semiconductive Metal-Organic Framework for Highly Efficient Microwave Absorption

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2022年第4期40卷 467-474页

作者： Peng Miao Tao Zhang Teng Wang Juan Chen Tong Gao You Wang Jie Kong Kai-Jie Chen School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi'anShaanxi 710072China School of Materials Science and Chemical Engineering Xi'an Technological UniversityXi'anShaanxi 710021China

Comprehensive Summary Advanced microwave absorbing materials(MAMs)are urgently required to eliminate and attenuate microwaves to address the ubiquitous microwave radiations and *** this contribution,we report the microwave absorption application of a two-dimensional(2D)semiconductive metal-organic framework(MOF),i.e.,CuHT(HT=4-hydroxythiophenol),without any pyrolysis at high temperature.

关键词： Metal-organic frameworks Microwave absorption Layered compound conduction loss Density functional calculations

IC Pattern Based Power Factor Maximization Model for Improved Power Stabilization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Intelligent Automation & Soft Computing 2023年第4期36卷 401-414页

作者： N.Hariharan Y.Sukhi N.Kalaiarasi R.M.K.College of Engineering and Technology Thiruvallur601206India R.M.K.Engineering College Thiruvallur601206India

The voltageﬂuctuation in electric circuits has been identiﬁed as key issue in different electric *** the usage of electricity growing in rapid way,there exist higherﬂuctuations in powerﬂ*** maintain theﬂow or stabi-lity of power in any electric circuit,there are many circuit models are discussed in ***,they suffer to maintain the output voltage and not capable of maintaining power *** improve the performance in power stabilization,an efﬁcient IC pattern based power factor maximization model(ICPFMM)in this *** model is focused on improving the power stability with the use of IC(Inductor and Conductor)towards identifying most efﬁcient circuit for the current duty cycle according to the input voltage,voltage in capacitor and output voltage *** model with boost converter diverts the incoming voltage through number of conductors and *** triggering speciﬁc inductor,a speciﬁc capacitor gets charged and a particular circuit gets *** model maintains num-ber of IC(Inductor and Conductor)patterns through which the powerﬂow *** to that,the pattern available,the mofset controls the level of power to be regulated through any *** the pattern,the model computes the Cir-cuits Switching loss and Circuits conduction loss for various ***-ing to the input voltage,the model estimates Circuit Power Stabilization Support(CPSS)according to the voltage available in any capacitor and input *** the value of CPSS,the model trigger optimal number of circuits to maintain voltage *** this approach,more than one circuit has been triggered to maintain output voltage and to get *** proposed model not only main-tains power stability but also reduces the wastage in voltage which is not *** proposed model improves the performance in voltage stability with less switching loss.

关键词： Soft computing DC-DC converters boost rectiﬁers power stabilization conduction loss switching loss intelligent automation