核心空洞腔三元MOF衍生复合材料具有层次性的异构接口,通过多尺度损失协同作用实现超宽带电磁波吸收
Tong Wu1, Penggang Ren2, Shengchong Hui3
1School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China.
Journal of colloid and interface science
|July 18, 2025
概括
一个新的层次化的异构接口-空洞腔协同策略创造了先进的TiO2/C@N/C@Co/N/C复合材料,用于优异的电磁波吸收. 这些材料提供了卓越的性能,包括显著的反射损失和宽带宽,这对于现代隐形技术至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 电磁学 电磁学 电磁学 电磁学
背景情况:
- 由于5G,雷达和隐形技术的进步,对具有薄型的超宽带电磁波 (EMW) 吸收材料的需求正在增加.
- 现有的材料往往难以平衡吸收效率与最小厚度和广泛的有效带宽.
研究的目的:
- 为设计先进的EMW吸收材料开发一种新的层次化的异构接口-空腔协同效应 (HHS) 战略.
- 通过逐步协调增长方法合成和表征一个核心空洞腔外结构的TiO2/C@N/C@Co/N/C (TNCC) 复合物.
- 研究空腔工程和界面梯度调制对EMW吸收性质的协同效应.
主要方法:
- 在MIL-125-NH2基板上,ZIF-8和ZIF-67的逐步协调生长.
- 热处理以形成核心空洞腔外 (CHS) 结构的TNCC复合材料.
- 多尺度表征,有限元多物理模拟 (COMSOL,CST) 和密度函数理论 (DFT) 计算.
主要成果:
- 在2.11毫米厚度下达到-64.6dB的最小反射损失 (RLmin) 和8.05GHz的有效吸收带宽 (EAB),覆盖Ku频段和X频段的一半.
- 在 15.025 GHz 显示了 36.3 dB 的雷达截面 (RCS) 降低,角度覆盖率为 85.7%.
- 空腔工程增强了极化放松和抑制了金属聚合,而界面梯度调制通过电子合和磁性损失改善了能量消散.
结论:
- 该HHS战略为精确的结构设计和MOF衍生EMW吸收器的功能集成提供了一种新的方法.
- 由于协同的多尺度极化和磁性损失机制,TNCC复合材料具有出色的EMW吸收能力.
- 这项研究提供了通过先进的材料设计和理解协同效应来优化EMW减弱的基本见解.
相关概念视频
IR Absorption Frequency: Hybridization
772
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
772
Electromagnetic Waves in Matter
3.4K
Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the...
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the...
3.4K
Electromagnetic Wave Equation
1.3K
Maxwell's equations for electromagnetic fields are related to source charges, either static or moving. These fields act on a test charge, whose trajectory can thus be determined using suitable boundary conditions. The objective of electromagnetism is thus theoretically complete.
However, although electric and magnetic fields were first introduced as mathematical constructs to simplify the description of mutual forces between charges, a natural question emerges from Maxwell's equations:...
However, although electric and magnetic fields were first introduced as mathematical constructs to simplify the description of mutual forces between charges, a natural question emerges from Maxwell's equations:...
1.3K
Standing Waves in a Cavity
1.0K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.0K
Absorption of Radiation
822
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
822
Electromagnetic Waves
9.3K
James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
9.3K


