具有磁芯和介电壳的铁基纳米复合材料的合成及电磁性能
发布时间：2021-08-30 22:07
纳米复合材料在解决能源、环境、国防、电磁污染、健康等诸多问题方面表现出巨大潜力,近几年成为关注和研究热点。纳米复合材料表现出优异的协同效应和物理化学性质,与其核、壳结构及其表面/界面结构密切相关。核/壳型纳米复合材料作为微波吸收与屏蔽材料具有重要应用价值,将磁性和介电相结合到核/壳型纳米结构中,通过磁共振、界面极化,弛豫极化、涡流共振和传导损耗等机制实现电磁波的吸收与损耗。电磁波吸收材料根据其损耗机理可划分为电介质型、磁介质型和电阻型。为了解决日益增长的电磁干扰问题和满足军事隐身需求,迫切需要研发强吸收、高强度、重量轻、成本低、频率范围宽的微波吸收材料。同时,由于吉赫兹波段微波器件的广泛使用,如移动通讯、航空飞机、铁路系统、电网系统、高速公路、局域网、雷达系统、Wi-Fi、W-LAN、笔记本电脑等,造成的电磁污染对公众健康和自然环境产生严重危害。因此,设计和研发优异的电磁波吸收材料以减少电磁辐射对人体带来的伤害引起了广泛重视和深入研究。核/壳型纳米复合材料的电磁性能主要取决于其微观形貌、粒子尺寸及分布、表面/界面、组成和微观结构因素等。本论文将重点研究磁/介电型纳米复合材料的制备与表征...
【文章来源】：大连理工大学辽宁省 211工程院校 985工程院校 教育部直属院校
【文章页数】：162 页
【学位级别】：博士
【文章目录】：
Abstract
摘要
List of Abbreviations
1 Introduction
1.1 Electromagnetic waves
1.1.1 General introduction to EMW
1.1.2 EMW interaction with the material
1.1.3 Measurement of EMW parameters
1.2 Classification of EMW absorbing materials
1.2.1 Magnetic EMW absorbers
1.2.2 Dielectric EMW absorbers
1.2.3 Conducting/Resistive EMW absorbers
1.2.4 Composite EMW absorbers
1.3 Morphologies based nanomaterials for EMW absorption
1.3.1 One-dimensional(1D) absorbing materials
1.3.2 Two-dimensional (2D) absorbing materials
1.3.3 Three dimensional (3D) network structures microwave absorbers
1.4 Preparation approaches to core/shell nanomaterials
1.4.1 Arc discharge plasma process
1.4.2 Laser ablation process
1.4.3 Chemical vapor deposition process
1.4.4 Spray pyrolysis process
1.5 Applications of EMW
1.6 Motivation and thesis outline
2 Experimental details & materials characterization techniques
2.1 Preparation of nanomaterials by dc arc plasma method
2.1.1 Plasma overview
2.1.2 Optical Emission Spectroscopy
2.1.3 Preparation conditions
2.2 Techniques and tools for the characterization of nanocomposites
2.2.1 Characterization techniques
2.2.2 EMW parameters testing
3 Synthesis, characterization and microwave absorption of silica-coated Fe@SiO_2nanocapsules
3.1 Background
3.2 Experimental setup
3.2.1 Synthesis of Fe@SiO_2 NCs and Fe NPs
3.2.2 Preparation of composites for EMW test
3.3 Results and discussion
3.3.1 Crystal structure and morphology characterizations
3.3.2 Surface characterizations
3.3.3 Formation mechanism under OES diagnosis on plasma
3.3.4 Thermal stability
3.3.5 Static magnetic properties
3.3.6 EMW parameters
3.3.7 Microwave absorption properties
3.4 Summary
4 Electromagnetic respondences of the interfacial engineered Fe/FeSi/SiO_2nanocomposites
4.1 Background
4.2 Experimental setup
4.2.1 Synthesis of Fe@FeSi/SiO_2 and FeSi/SiO_2 nanocomposite
4.2.2 Preparation of composites for EMW test
4.3 Results and discussion
4.3.1 Crystal structure and microstructure characterizations
4.3.2 Surface characterizations
4.3.3 Formation mechanism
4.3.4 Static magnetic properties
4.3.5 EMW parameters
4.3.6 Microwave absorption properties
4.4 Summary
5 Zirconium oxide-coated Fe@ZrO_2 nanochains microwave absorbent with superioranti-oxidization capability
5.1 Background
5.2 Experimental setup
5.2.1 Synthesis of Fe@ZrO_2 nanochains
5.2.2 Preparation of composite for EMW test
5.3 Results and discussion
5.3.1 Crystal structure and morphology characterizations
5.3.2 Surface characteriaztions
5.3.3 Formation mechanism of nanocomposites
5.3.4 Static magnetic properties
5.3.5 Thermal stability
5.3.6 EMW parameters
5.3.7 Microwave absorption properties
5.4 Summary
6 Synthesis of carbon-coated (SiC/Fe)@C nanowires (NWs) and the optimizedmicrowave absorption
6.1 Background
6.2 Experimental setup
6.2.1 Synthesis of (SiC/Fe)@C NWs
6.2.2 Preparation of composites for EMW test
6.3 Results and discussion
6.3.1 Crystal structure and morphology characterizations
6.3.2 Formation mechanism of (SiC/Fe)@C NWs
6.3.3 Surface characterizations
6.3.4 Thermal stability
6.3.5 Static magnetic / conductivity properties
6.3.6 EMW parameters
6.3.7 Microwave absorption properties
6.4 Summary
7 Conclusion, innovation, and outlook
7.1 Conclusions
7.2 Innovation points
7.3 创新点
7.4 Outlook
References
Published academic papers during Ph.D
Acknowledgement
About the Author
本文编号：3373585
【文章来源】：大连理工大学辽宁省 211工程院校 985工程院校 教育部直属院校
【文章页数】：162 页
【学位级别】：博士
【文章目录】：
Abstract
摘要
List of Abbreviations
1 Introduction
1.1 Electromagnetic waves
1.1.1 General introduction to EMW
1.1.2 EMW interaction with the material
1.1.3 Measurement of EMW parameters
1.2 Classification of EMW absorbing materials
1.2.1 Magnetic EMW absorbers
1.2.2 Dielectric EMW absorbers
1.2.3 Conducting/Resistive EMW absorbers
1.2.4 Composite EMW absorbers
1.3 Morphologies based nanomaterials for EMW absorption
1.3.1 One-dimensional(1D) absorbing materials
1.3.2 Two-dimensional (2D) absorbing materials
1.3.3 Three dimensional (3D) network structures microwave absorbers
1.4 Preparation approaches to core/shell nanomaterials
1.4.1 Arc discharge plasma process
1.4.2 Laser ablation process
1.4.3 Chemical vapor deposition process
1.4.4 Spray pyrolysis process
1.5 Applications of EMW
1.6 Motivation and thesis outline
2 Experimental details & materials characterization techniques
2.1 Preparation of nanomaterials by dc arc plasma method
2.1.1 Plasma overview
2.1.2 Optical Emission Spectroscopy
2.1.3 Preparation conditions
2.2 Techniques and tools for the characterization of nanocomposites
2.2.1 Characterization techniques
2.2.2 EMW parameters testing
3 Synthesis, characterization and microwave absorption of silica-coated Fe@SiO_2nanocapsules
3.1 Background
3.2 Experimental setup
3.2.1 Synthesis of Fe@SiO_2 NCs and Fe NPs
3.2.2 Preparation of composites for EMW test
3.3 Results and discussion
3.3.1 Crystal structure and morphology characterizations
3.3.2 Surface characterizations
3.3.3 Formation mechanism under OES diagnosis on plasma
3.3.4 Thermal stability
3.3.5 Static magnetic properties
3.3.6 EMW parameters
3.3.7 Microwave absorption properties
3.4 Summary
4 Electromagnetic respondences of the interfacial engineered Fe/FeSi/SiO_2nanocomposites
4.1 Background
4.2 Experimental setup
4.2.1 Synthesis of Fe@FeSi/SiO_2 and FeSi/SiO_2 nanocomposite
4.2.2 Preparation of composites for EMW test
4.3 Results and discussion
4.3.1 Crystal structure and microstructure characterizations
4.3.2 Surface characterizations
4.3.3 Formation mechanism
4.3.4 Static magnetic properties
4.3.5 EMW parameters
4.3.6 Microwave absorption properties
4.4 Summary
5 Zirconium oxide-coated Fe@ZrO_2 nanochains microwave absorbent with superioranti-oxidization capability
5.1 Background
5.2 Experimental setup
5.2.1 Synthesis of Fe@ZrO_2 nanochains
5.2.2 Preparation of composite for EMW test
5.3 Results and discussion
5.3.1 Crystal structure and morphology characterizations
5.3.2 Surface characteriaztions
5.3.3 Formation mechanism of nanocomposites
5.3.4 Static magnetic properties
5.3.5 Thermal stability
5.3.6 EMW parameters
5.3.7 Microwave absorption properties
5.4 Summary
6 Synthesis of carbon-coated (SiC/Fe)@C nanowires (NWs) and the optimizedmicrowave absorption
6.1 Background
6.2 Experimental setup
6.2.1 Synthesis of (SiC/Fe)@C NWs
6.2.2 Preparation of composites for EMW test
6.3 Results and discussion
6.3.1 Crystal structure and morphology characterizations
6.3.2 Formation mechanism of (SiC/Fe)@C NWs
6.3.3 Surface characterizations
6.3.4 Thermal stability
6.3.5 Static magnetic / conductivity properties
6.3.6 EMW parameters
6.3.7 Microwave absorption properties
6.4 Summary
7 Conclusion, innovation, and outlook
7.1 Conclusions
7.2 Innovation points
7.3 创新点
7.4 Outlook
References
Published academic papers during Ph.D
Acknowledgement
About the Author
本文编号：3373585
本文链接：https://www.wllwen.com/shoufeilunwen/gckjbs/3373585.html
