Three-dimensional porous manganese oxide/nickel/carbon microspheres as high-performance electromagnetic wave absorbers with superb photothermal property

Bioinspired Hollow/Hollow Architecture with Flourishing Dielectric Properties for Efficient Electromagnetic Energy Reclamation Device

“…Unlike the nearly immutable permittivity of ZC@NC‐1, the overall trend of the undulatory ε″ curves for ZC@NC‐2 and ZC@NC‐3 was to reduce gradually with the incremental frequencies owing to the mighty conductive loss inside the composites, and several formants observed in both real and imaginary dielectric constants could be ascribed to polarization behaviors. [ 26,28 ] Based on the Debye theory, [ 35 ] the Cole‐Cole plots were charted to further confirm the above viewpoints (Figure S11d and Equations S5–S9, Supporting Information). More semicircles with downward openings were found in ZC@NC‐2 and ZC@NC‐3, originating from multiple polarization relaxations induced by multiphase interfaces, dangling bonds from carbon, and lattice imperfection.…”

“…As uncovered by Figure a, the mesoporous characteristic of samples was verified in conformity with conspicuous type IV curves and H4 type hysteresis loops. [ 26 ] Besides, apart from increasing the surface area, the ingenious hollow/hollow architecture reduced the aperture to facilitate the contact of EMW with absorbers and aggrandize the chance of multiple reflections (Table S2, Supporting Information). It was noteworthy that the surface area of ZC@NC‐3 less than that of ZC@NC‐2, which might be attributed to the intertwining and covering of plethoric CNTs going against the further growth of acreage.…”

Tailoring Built‐In Electric Field in a Self‐Assembled Zeolitic Imidazolate Framework/MXene Nanocomposites for Microwave Absorption

“…RCS values were calculated using following equation [ 52 ] $$$$\begin{equation}\sigma \left( {{\mathrm{dB}}\;{{\mathrm{m}}}^{\mathrm{2}}} \right) = 10\;{\mathrm{log}}{\left( {\frac{{4\pi S}}{{{\lambda }^2}}\left| {\frac{{{E}_S}}{{{E}_i}}} \right|} \right)}^2\end{equation}$$$$where S represents the area of the model, λ is the wavelength of the incident wave, and E s and E i denote the electric field intensities of the scattered and incident waves, respectively. [ 31 ] Briefly, a model comprising an absorbent coating (200 × 200 × 2 mm 3 ) uniformly covering a perfect‐electric‐conductor plate (200 × 200 × 1 mm 3 ) was constructed along the XY ‐plane.…”

Structural Engineering Enabled Bimetallic (Ti1‐yNby)2AlC Solid Solution Structure for Efficient Electromagnetic Wave Absorption in Gigahertz

“…More obvious Cole-Cole semicircles and depressed straight tail region can be observed due to the solid-solution scattering effect caused by Nb modification, determining the improved polarization relaxation loss. [52,53] This implies that the EM wave behavior of the MAX phase solid solution is tunable through the M-site chemistry.…”