Co²⁺/Co³⁺ratio dependence of electromagnetic wave absorption in hierarchical NiCo₂O₄–CoNiO₂hybrids

Abstract

Amorphous hierarchical NiCo2O4–CoNiO2hybrids have been successfully fabricatedviaa facile one-pot hydrothermal route, followed by morphologic conversion into urchin-like structured NiCo2O4–CoNiO2nanorods and irregular-shaped hierarchical NiCo2O4–CoNiO2polyhedral nanocrystals through air-annealing treatment at 450 °C and 650 °C, respectively.

In-situ synthesis of carbon nanotubes decorated by magnetite nanoclusters and their applications as highly efficient and enhanced microwave absorber

“…Based on the transmit line theory [32][33][34][35], the reflection loss (RL) values for a single layer microwave absorber backed by a metal plate can be calculated by the relative complex permittivity and complex permeability as expressed by the following formulas:…”

CaCu3Ti4O12 particles and MWCNT-filled microwave absorber with improved microwave absorption by FSS incorporation

“…3a, both the bandwidth of reflection loss and absorbing intensity of absorber are significant increase in the frequency range of X-band. Compared with single CCTO particle-or MWCNT-filled composites with very narrow microwave absorption bandwidth, the enhanced microwave absorption of the CCTO particle-and MWCNT-filled composites mainly originates from the properly EM impedance matching and high EM wave attenuation [29][30][31][32][33][34][35], which is a synergetic consequence of the suitable value and frequency dependency of complex permittivity. These results indicate that CCTO particle-and MWCNT-filled coatings with wider microwave absorption bandwidth and/or thinner thickness, which can be obtained simply by using CCTO particles and MWCNTs as absorber and then optimizing filler content and properties.…”

Near-Infrared Spectroscopic Study of Chlorite Minerals

“…The absorption features of chlorites located between 2250 and 2340 nm (4440 and 4270 cm −1 ) can be explicitly separated into their constituent absorption bands using the Gaussian-Lorentz model [18], and the mathematical shape description of the individual absorptions is accurate [19][20][21][22][23][24]. The Gaussian-Lorentz model was developed and validated by empirical studies of isolated vibration absorption bands in both transmission and reflectance spectra of autunite, nontronite, and smectite [25,26].…”