Microwave absorption properties of Ag3PO4 nanoparticles-modified NI@C nanocapsules

Transform between the permeability and permittivity in Ni@C C NbC nanocomposites with enhanced microwave absorption properties

“…In addition, there is an obvious reflection peak detected at 2q ¼ 26 corresponding to the (002) planes of graphite phase. The graphite phase is difficult to find in the Ni@C nanocapsules because of breaking down the translation symmetry along radial direction [22,23]. With adding Nb content, the (111) reflection of nickel shifts to the lower angle, and the lattice parameter increases from 0.2032 nm to 0.2035 nm, which is presented in the right-hand panel of Fig.…”

Ag3PO4 nanoparticle-decorated Ni/C nanocapsules with tunable electromagnetic absorption properties

“…1,8 A Ni ingot of 99.9% purity was placed in a water-cooled copper crucible as the anode, while a tungsten needle of 5 mm diameter was employed as the cathode. After evacuating the arc-discharge chamber to 5 mPa, ethanol of 40 ml was introduced into the chamber as the C source.…”

“…The residual gas was then pumped out, and the black powders formed on the inner surface of the chamber were collected as the Ni/C product after they were passivated in N 2 gas for 10 h. Ag 3 PO 4 nanoparticles were prepared on the surface of the as-prepared Ni/C product using an ionexchange process. 8 Ni/C product of 0.25 g was dispersed into Na 2 HPO 4 hydrate solution of controlled volume under mechanical stirring. AgNO 3 solution of 12 mol/ml was added into the mixture of Ni/C product and Na 2 HPO 4 hydrate solution of 3 mol/ml using an AgNO 3 :Na 2 HPO 4 volume ratio of 1:2 at a titration rate of 100 ml/h under vigorous stirring for 1 h. The precipitates were collected by centrifugation, washed several times with distilled water and absolute ethanol, and dried in a vacuum at 60 • C for 12 h as the Ag 3 PO 4 @Ni/C product.…”

Excellent microwave absorption properties of Fe ion-doped SnO2/multi-walled carbon nanotube composites

“…Measurements were conducted within the range of 2-18 GHz via vector network analysis (AV3629D, China). RL of different Fe ion doping contents on the SnO 2 /MWCNTs-paraffin composites was calculated using the following equation: [27][28][29] RLðdBÞ ¼ 20 log…”