Enhanced microwave absorption properties of Fe3C/C nanofibers prepared by electrospinning

A review on electrospun magnetic nanomaterials: methods, properties and applications

“…With the extensive utilisation of electronic devices for civil and military purposes there is a strong desire to reduce electromagnetic (EM) pollution due to its associated negative impact on human health, national defence security and electronic safety. 121,[226][227][228][229][230][231] EM wave shielding, or absorption materials, are designed to address this challenge. Fig.…”

“…150,196 MAMs achieve EM attenuation through a combination of magnetic loss, electric loss and geometry (morphology). 226,228 Magnetic loss originates from the eddy current effect, natural ferromagnetic resonance and exchange resonance. For ferromagnetic materials, the magnetic loss ability is related to initial permeability (m i ), as shown in eqn (1), where a and b represent constants relating to the material being used, and l, k, x, M s and H c are the wavelength, magnetisation constant, elastic strain parameter of a crystal, saturation magnetisation and coercivity, respectively.…”

“…, respectively. 196,226,228 Reflection loss (RL) is calculated from eqn (2)-( 4): 196,226,228 RLðdBÞ…”

“…Dielectric and magnetic losses also influence RL and are used in combination to improve the microwave absorption performance. 228 Additionally, crosslinking the structure can cause a geometric effect that contributes to RL, as demonstrated with Fe/C cross-linked network structures. 228 Carbon fibres can be equipped with magnetic properties through the addition of MNPs to create EM absorbing materials.…”

A new way for lead–boron resin composite modification: SiO2 coated lead powders by a sol–gel method

“…Nuclear shielding composites are important materials used for blocking g rays and neutron radiation to ensure safety of personnel and machines. [1][2][3][4][5] Lead-boron polyethylene (PBPE) is widely used for nuclear shielding. The resins have good moderating effect on fast neutrons, while boron atoms can absorb thermal neutrons effectively and Pb atoms have effective shielding effect on g rays.…”