Two-dimensional confinement engineering of SiO2 nanosheets supported nano-cobalt for high-efficiency microwave absorption

Fabrication of iron manganese metal–organic framework derived magnetic MnFe2O4/C composites for broadband and highly efficient electromagnetic wave absorption

“…The EMW absorption performance of absorbers is tightly correlated with their electromagnetic parameters. 36–38 Generally, the real permittivity ( ε ′) and real permeability ( μ ′) represent the storage capacity of electric and magnetic field energy, respectively, while the imaginary permittivity ( ε ′′) and imaginary permeability ( μ ′′) denote the dissipation capacity of electric and magnetic field energies, respectively. 39,40 As shown in Fig.…”

MoS2-Based Nanocomposites for Microwave Absorption: A Review

“…108 The value of C o could be calculated by taking the real and imaginary values of the permeability obtained from the test into the above eq 2. 106,109 In general, the change of the value of C o with frequency could estimate whether the magnetic loss of the material is caused by eddy loss or natural resonance loss. 110,111 If the curve of the value of C o fluctuates greatly with frequency, it indicates that the magnetic loss of the material is mainly caused by natural resonance loss.…”

“…In order to study the eddy loss mechanism, the following formula is used to calculate the eddy current loss coefficient C o : C normalo = 2 π μ normalo d 2 σ = μ ″ false( μ ′ false) 2 f where μ o is the vacuum permeability, d is the thickness of the absorber, σ is the conductivity, μ′ is the real part of the permeability, μ″ is the imaginary part of the permeability, and f is the frequency . The value of C o could be calculated by taking the real and imaginary values of the permeability obtained from the test into the above eq . , In general, the change of the value of C o with frequency could estimate whether the magnetic loss of the material is caused by eddy loss or natural resonance loss. , If the curve of the value of C o fluctuates greatly with frequency, it indicates that the magnetic loss of the material is mainly caused by natural resonance loss. On the contrary, if the value of C o is almost a constant, the magnetic loss of the material is mainly caused by the eddy current loss. , Shown in Figure are the C o values of the C3N1, C1N3, and C1N1 Co-2DSi (400 °C), Co-2DSiO 2 (850 °C), and Co-2DSiO 2 (950 °C) samples.…”

“…Copyright 2023 Elsevier Inc. C o – f curves of absorbers (b) Co-2DSi (400 °C), (c) Co-2DSiO 2 (850 °C), and (d) Co-2DSiO 2 (950 °C). Reproduced with permission from ref . Copyright 2023 Elsevier B.V.…”

Highly lubricating and wear‐resistant Ti3C2Tx@SiO2/PI composites based on the action of transfer film at the friction surface

“…0D particle intercalation is an effective way to reduce the COF of 2D materials. 13 The particles can make 2D-layered materials with increased spacing making the layers easy to peel, which will improve the lubrication characteristics of the 2D material. 14 SiO 2 particles with nanosphere structure are a typical 0D reinforcing material in the field of modified polymer tribological properties.…”