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Composition Optimization and Microstructure Design in MOFs-Derived Magnetic Carbon-Based Microwave Absorbers:A Review 被引量:11
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作者 Honghong Zhao Fengyuan Wang +3 位作者 liru cui Xianzhu Xu Xijiang Han Yunchen Du 《Nano-Micro Letters》 SCIE EI CAS CSCD 2021年第12期383-415,共33页
Magnetic carbon-based composites are the most attractive candidates for electromagnetic(EM)absorption because they can terminate the propagation of surplus EM waves in space by interacting with both electric and magne... Magnetic carbon-based composites are the most attractive candidates for electromagnetic(EM)absorption because they can terminate the propagation of surplus EM waves in space by interacting with both electric and magnetic branches.Metal-organic frameworks(MOFs)have demonstrated their great potential as sacrificing precursors of magnetic metals/carbon composites,because they provide a good platform to achieve high dispersion of magnetic nanoparticles in carbon matrix.Nevertheless,the chemical composition and microstructure of these composites are always highly dependent on their precursors and cannot promise an optimal EM state favorable for EM absorption,which more or less discount the superiority of MOFs-derived strategy.It is hence of great importance to develop some accompanied methods that can regulate EM properties of MOFs-derived magnetic carbon-based composites e ectively.This review comprehensively introduces recent advancements on EM absorption enhancement in MOFs-derived magnetic carbon-based composites and some available strategies therein.In addition,some challenges and prospects are also proposed to indicate the pending issues on performance breakthrough and mechanism exploration in the related field. 展开更多
关键词 Magnetic carbon-based composites Metal–organic frameworks Composition optimization Microstructure design EM absorption enhancement
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Al_(2)O_(3)/TiO_(2)复配改性环氧树脂的绝缘特性 被引量:4
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作者 马文杰 赵红红 +3 位作者 崔丽茹 张磊江 杜耘辰 韩喜江 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2021年第2期61-66,共6页
为了满足高压直流输电体系对绝缘子性能的特殊要求,使用三氧化二铝(Al_(2)O_(3))和二氧化钛(TiO_(2))复配掺杂的方法改性环氧树脂基底,对复合物表面结构以及绝缘特性进行了分析。绝缘性能测试结果表明,相比于Al_(2)O_(3)或者TiO_(2)单... 为了满足高压直流输电体系对绝缘子性能的特殊要求,使用三氧化二铝(Al_(2)O_(3))和二氧化钛(TiO_(2))复配掺杂的方法改性环氧树脂基底,对复合物表面结构以及绝缘特性进行了分析。绝缘性能测试结果表明,相比于Al_(2)O_(3)或者TiO_(2)单独掺杂,共掺杂可以更显著降低复合物表面电阻率并且增加电气强度。将2种纳米材料的质量调到合适比例时,纳米粉体/树脂基底界面上会形成一定的导电通道,载流子可以沿着通道被传导出去,从而改善表面电阻率。而适当量Al_(2)O_(3)的引入可以进一步改善材料的电气强度。优化后复合物的表面电阻率为8.62×10^(13)Ω,电气强度可达到29.01 kV/mm,共掺杂的协同效应对于树脂绝缘性能的提升十分有意义。 展开更多
关键词 环氧树脂 三氧化二铝 二氧化钛 电阻率 电气强度
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Polymer-bubbling for one-step synthesis of three-dimensional cobalt/carbon foams against electromagnetic pollution 被引量:2
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作者 Fengyuan Wang Ping Xu Ning Shi +5 位作者 liru cui Yahui Wang Dawei Liu Honghong Zhao Xijiang Han Yunchen Du 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第34期7-16,共10页
Constructing three-dimensional(3D)foam-like structure in magnetic metal/carbon composites is regarded as a promising pathway to reinforce their electromagnetic(EM)functions.Herein,a nitrateassisted polymer-bubbling st... Constructing three-dimensional(3D)foam-like structure in magnetic metal/carbon composites is regarded as a promising pathway to reinforce their electromagnetic(EM)functions.Herein,a nitrateassisted polymer-bubbling strategy is reported for the synthesis of Co/carbon foams,which is simply accomplished by direct pyrolyzing the mixture of polyvinylpyrrolidone(PVP)and cobalt nitrate hexahydrate(Co(NO_(3))_(2)·6 H_(2) O).Co(NO_(3))_(2)·6H_(2)O not only plays as the source of Co nanoparticles,but also accounts for the formation of 3D microstructure through releasing gas.By manipulating the weight ratio of Co(NO_(3))_(2)·6H_(2)O to PVP,the chemical composition,microstructure,and EM properties of these composites can be easily regulated.When the weight ratio reaches 1.5,the resultant composite displays good microwave absorption performance,whose reflection loss intensity and effective absorption bandwidth are superior to those of many common Co/C composites.EM analysis reveals that such architecture is greatly helpful to establish cross-linked conductive networks in the wax matrix,resulting in powerful dielectric loss under low absorber loading.Meanwhile,3D microstructure is also beneficial for multiple reflections that equal to extend the transmission path of incident EM waves.Simple synthesis strategy and desirable properties of these magnetic carbon foams may render them as the low-cost substitute of 3D graphene for the application against EM pollution. 展开更多
关键词 Polymer-bubbling Three-dimensional foams Co/C composites Electromagnetic pollution Microwave absorption
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中国崛起与国际秩序演变 被引量:2
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作者 崔立如 《全球秩序》 2018年第1期1-18,共18页
近年来,中国崛起与国际秩序的关系被广泛讨论。在国际关系复杂且不确定的演变中,中国将在国际秩序中扮演何种角色?中共十九大之后,'强起来'的中国要争取在一个相互依赖与互联性更大的世界经济体系当中,获得具有更大主动性的地... 近年来,中国崛起与国际秩序的关系被广泛讨论。在国际关系复杂且不确定的演变中,中国将在国际秩序中扮演何种角色?中共十九大之后,'强起来'的中国要争取在一个相互依赖与互联性更大的世界经济体系当中,获得具有更大主动性的地位。新时代的中国外交需要以高度的智慧和实用的政策有效应对前所未有的复杂课题,尤其需要努力在两个并行的进程之间维持一种微妙的平衡:作为崛起大国中国既要追求更大的安全与发展空间,更加重视现实主义的国家之间竞争问题;与此同时,中国还要努力维护建立在相互依赖关系基础上的全球经济体系和全球化进程的持续性。 展开更多
关键词 中国崛起 世界秩序 国家竞争 全球化
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