材料科学
双金属
微波食品加热
电磁屏蔽
煅烧
屏蔽效应
吸收(声学)
复合数
微观结构
金属
反射损耗
玻璃微球
复合材料
微球
光电子学
纳米技术
化学工程
催化作用
物理
工程类
化学
冶金
生物化学
量子力学
作者
Qianqian Jia,Zhenguo An,Man Li,Ran Liu,Weixin Xiao,Jingjing Zhang
出处
期刊:Small
[Wiley]
日期:2022-11-27
卷期号:19 (4): 2205735-2205735
标识
DOI:10.1002/smll.202205735
摘要
The construction of hollow metallic microspheres with rationally designed building blocks of the metal shell is a promising way to achieve low density and functionality control, but the microengineering of the metallic structures on a micrometer spherical surface is a great challenge. In the present work, a novel and simple calcination-induced aggregation strategy is developed to realize the distribution status and microstructure control of Co-Cu bimetal building blocks assembled on a hollow glass microsphere support, and thus a series of low-density (0.58 g cm-3 ) dual shell composite hollow microspheres are constructed with gradient in electromagnetic property depending on the calcination temperature (CT). The optimized microwave shielding performance can be achieved at a CT of 500 °C, while further increasing CT to 700 °C leads to an interesting conversion from microwave shielding to absorption with an optimized effective absorption bandwidth of 4.64 GHz at a low matching thickness of 1.33 mm. The mechanism underlying the CT-dependent metallic shell structure variation and further the decisive effect of the shell structure on the microwave response behavior are proposed based on a series of contrast experiments.
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