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超材料吸波结构的电磁-热能转换研究 被引量:4
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作者 赵强 于坤 +2 位作者 宋镇江 龚新刚 何泓材 《电子元件与材料》 CAS CSCD 北大核心 2018年第7期79-82,87,共5页
设计了一种由金属-介质-金属组成的超材料吸波结构,仿真得到在2.433 GHz处吸收率达到0.99,能量损耗分析表明电磁波能量主要由介质损耗消耗,转化为热能。进一步仿真分析该吸波结构在2.433 GHz,且功率密度为0.086 W·cm^(-2)的电磁波... 设计了一种由金属-介质-金属组成的超材料吸波结构,仿真得到在2.433 GHz处吸收率达到0.99,能量损耗分析表明电磁波能量主要由介质损耗消耗,转化为热能。进一步仿真分析该吸波结构在2.433 GHz,且功率密度为0.086 W·cm^(-2)的电磁波作用下的温度分布,表明温度最高达到55℃。最后通过实验证实,并结合热电模块,实现电磁-热能-电能转换。该研究可用于温度控制和能量无线传输等。 展开更多
关键词 超材料 电磁波吸收结构 吸收 电磁 能量转换 能量无线传输
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Magnetic and microwave absorption properties of Ni_(1-x)Zn_xFe_2O_4 nanocrystalline synthesized by sol-gel method 被引量:4
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作者 ZHANG Min LIU QiangChun +4 位作者 ZI ZhenFa DAI YuQiang ZHU XueBin SUN YuPing DAI JianMing 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第1期13-19,共7页
Ni1-xZnxFe2O4(0≤x≤1,in steps of 0.1) nanocrystallines were synthesized by sol-gel route.The doping effects of zinc on structural,magnetic and microwave absorption properties were investigated in detail.X-ray diffrac... Ni1-xZnxFe2O4(0≤x≤1,in steps of 0.1) nanocrystallines were synthesized by sol-gel route.The doping effects of zinc on structural,magnetic and microwave absorption properties were investigated in detail.X-ray diffraction(XRD) results show that all the samples are single-phase spinel structure.The magnetic and microwave absorption properties are strongly dependent on the zinc content,which can be understood in terms of the cations redistribution in spinel tetrahedral and octahedral sites with the increase of zinc content.The magnetic measurement shows the antiferromagnetic nature of the samples for x=0.9 and x=1.0.The saturation magnetization reaches the maximum of 3.35μB/f.u.at x=0.5.The optimal reflection loss(RL) of-29.6 dB is found at 6.5 GHz for an absorber thickness of 5 mm.The RL values exceeding 10 dB are obtained for the absorber in the range of 3.9-8.9 GHz.These Ni1-xZnxFe2O4 nanocrystallines may be attractive candidates for electromagnetic wave absorption materials. 展开更多
关键词 Ni-Zn ferrite magnetic measurement microwave absorption properties
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Highly efficient and broad electromagnetic wave absorbers tuned via topology-controllable metal-organic frameworks 被引量:5
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作者 Peng Miao Jianxin Chen +2 位作者 Yusheng Tang Kai-Jie Chen Jie Kong 《Science China Materials》 SCIE EI CSCD 2020年第10期2050-2061,共12页
Advanced electromagnetic(EM)wave absorbing materials with strong absorption and broad bandwidth are important for military stealth and elimination of microwave pollution in consumers’electronics.Metal organic framewo... Advanced electromagnetic(EM)wave absorbing materials with strong absorption and broad bandwidth are important for military stealth and elimination of microwave pollution in consumers’electronics.Metal organic framework(MOF)-derived metal/carbon hybrids with ordered structure are significantly urgent in this field.In this contribution,we presented a design strategy of hollow cage-like or solid box-like magnetic/dielectric Fe/Co/C and dielectric Fe/Mn/C EM wave absorbing nanomaterials via pyrolyzing Prussian blue’s analogs with controllable topology and phase composition.The solid box-like Fe/Co/C and hollow cage-like Fe/Mn/C showed favorable absorption property with a broad effective absorption bandwidth(EAB)and a low reflection loss(RL).Especially,the EAB of 8.8 GHz at a thickness of 2.5 mm for solid box-like Fe/Co/C nanocomplex prepared at 900℃is a new record for this type of materials.The design and tuning strategy for EM wave absorbers derived from topology-controllable MOF is important for EM functional materials possessing great potential in military stealth and consumers’electronics. 展开更多
关键词 electromagnetic wave absorber MOF Prussian blue's analogs TOPOLOGY PYROLYSIS
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