无otropic等价双极的自发定向极化利用了超薄电磁波吸收器的热学工程
Honghan Wang1, Xinyu Xiao1, Shangru Zhai2
1Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, 116034, People's Republic of China.
Nano-micro letters
|September 26, 2024
概括
研究人员开发了一种新型的碳支持者/纳米级高合金 (HEAs) 复合材料,用于高效的电磁波 (EMW) 吸收. 这种先进的材料在超薄厚度下实现了特殊的EMW吸收,在电磁功能设备中提供了有前途的应用.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 电磁主义 电磁主义
背景情况:
- 高合金 (HEAs) 为电磁波 (EMW) 吸收提供可调节的电子特性.
- 碳基材料是提高EMW吸收性能的有效支持.
- 控制电子迁移和双极极化是设计高效EMW吸收器的关键.
研究的目的:
- 开发一种新型的碳支持者/纳米级HEAs复合物,以增强EMW吸收.
- 研究碳化纤维素纸 (CCP) 在HEAs核和异质接口形成中的作用.
- 阐明EMW吸收复合材料介电性质背后的机制.
主要方法:
- 一种使用CCP作为碳支器的改革性碳热冲击方法.
- 在碳化纤维素纤维 (CCF) 上保存含氧功能组.
- 合成CCP/HEAs复合物,含有不同的Mn含量,然后进行表征和理论计算.
主要成果:
- 使用35%Mn的CCP/HEAs复合物 (CCP/HEAs-Mn2.15) 显示EMW吸收效率为-51.35dB.
- 在1.03毫米的厚度下实现了超薄的EMW吸收.
- 识别了可切换的富含电子的位点和有助于介电性质的异构等价二极体.
结论:
- 开发的CCP/HEAs复合物是一种高效的EMW吸收器,在最小厚度下表现出色.
- 使用CCP的碳热冲击方法是设计基于HEAs的EMW吸收材料的可行策略.
- 这些发现为设计先进的电磁功能设备提供了理论基础.
相关概念视频
Potential Due to a Polarized Object
370
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
370
Induced Electric Dipoles
4.2K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.2K
Atomic Nuclei: Nuclear Relaxation Processes
632
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
632
π Electron Effects on Chemical Shift: Overview
1.1K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.1K
Dual Nature of Electromagnetic (EM) Radiation
2.0K
Electromagnetic (EM) radiation consists of electric and magnetic field components oscillating in planes perpendicular to each other and mutually perpendicular to radiation propagation through space. EM radiation can be classified as a wave, characterized by the properties of waves such as wavelength (denoted as λ) and frequency (represented by ν).
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the...
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the...
2.0K
Electromagnetic Waves in Matter
3.0K
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...
3.0K


