Related Experiment Video
Updated: Sep 13, 2025
09:01
Magnetic-, Acoustic-, and Optical-Triple-Responsive Microbubbles for Magnetic Hyperthermia and Pothotothermal Combination Cancer Therapy
Published on: May 22, 2020
3.2K
Facile synthesis of magnetic core-shell structures for tunable microwave absorption
Jiao Liu1, Xukang Han1, Wenjuan Ren1
1School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, People's Republic of China. mamingliang@qut.edu.cn.
Nanoscale
|July 29, 2025
Summary
A novel SnCo/C@MoS2 composite effectively absorbs microwaves, showing minimal reflection loss and broad bandwidth. This advanced material offers superior electromagnetic wave attenuation for 5G applications.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetics
Background:
- The proliferation of 5G technology and radar systems intensifies electromagnetic pollution.
- Advanced microwave absorption materials are crucial for mitigating electromagnetic interference.
Purpose of the Study:
- To develop a novel core-shell composite material for enhanced microwave absorption.
- To investigate the synergistic effects of combining one-dimensional and two-dimensional nanostructures.
Main Methods:
- Synthesis of SnCo/C@MoS2 composite using electrospinning and hydrothermal methods.
- Characterization of material properties and microwave absorption performance.
- Electromagnetic wave (EMW) attenuation analysis using Computer Simulation Technology (CST).
Main Results:
- The SnCo/C@MoS2 composite achieved a minimum reflection loss (RLmin) of -64.27 dB at 1.52 mm thickness.
- An effective absorption bandwidth (EAB) of 5.20 GHz was recorded.
- Simulated radar cross-section (RCS) values were below -20 dB m².
Conclusions:
- The core-shell SnCo/C@MoS2 composite demonstrates excellent microwave absorption capabilities.
- Synergistic effects between 1D carbon nanofibers and 2D MoS2 nanosheets enhance interfacial polarization and multi-loss mechanisms.
- This material shows significant potential for electromagnetic wave attenuation applications.
Related Concept Videos
01:14Diamagnetic Shielding of Nuclei: Local Diamagnetic Current
962
An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
962
01:05Atomic Nuclei: Magnetic Resonance
758
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
758
01:28Standing 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
01:31Magnetic Susceptibility and Permeability
1.4K
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
1.4K
01:31Ferromagnetism
2.5K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.5K
01:26Diamagnetism
2.5K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.5K