It is very interesting that these Co/C composites present different dielectric loss ability and similar magnetic loss ability, resulting in their distinguishable reflection loss characteristics.
In this work, the CoFe2O4 nanoparticles were used to bring magnetic loss ability, while the graphene nanosheets were designed to bring dielectric loss ability.
That is to say, the amorphous shells play an important role in allowing broader frequency range microwave absorption because of their steady dielectric loss ability in this range.
By controlling the weight ratio of precursor PVP, both the dielectric loss ability and microwave absorption performance of the nanocomposites were improved.
We also proved that the generated hollow void and mesporous lay in carbon spheres could boost dielectric loss ability and impedance match behavior.
A delta-function method and attenuation constant validate that the matched characteristic impedance and improved loss ability in Co@C microspheres account for the significant enhancement.
Electromagnetic parameters reveal that the yolk-shell structure is favorable for the matching of characteristic impedance, and more importantly, desirable dielectric loss ability can be achieved at matched characteristic impedance.
The nanoflow valve was integrated into glass microfluidic chips fabricated by wet chemical etching, and evaluated for flow loss, ability to maintain stable flow and effectiveness for removing trapped air.
This is can be explained that carbon sphere at high temperature can gradual reduce the Fe3O4 quantum dots to Fe, leading to the boosted polarization and conductive loss ability.
The greater microwave absorption performance of the double-layer absorbers should be attributed to the better impedance matching characteristic of the CNZF layer and the greater dielectric loss ability of rGO layer.
