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Dielectric properties of SiC/Ni nanocomposites prepared by a simple and facile electroless plating approach at X band are investigated. Compared to the original SiC nanopartieles (SiCp), the real part of the permittivity, ε', and the dielectric loss tangent tang δe of SiC/Ni nanocomposites are clearly enhanced by about 31% and 33%, respectively. The effective equations for complex permittivity of SiC/Ni nanoeomposites are proposed. We also calculate ε' and tan δe of SiC/Ni nanoeomposites and the calculated results are well consistent with the measured data. 相似文献
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Deposition Behavior and Mechanism of Ni Nanoparticles on Surface of SiC Particles in Solution Systems 下载免费PDF全文
Ni-deposited SiC particles are prepared successfully by a facile chemical reaction approach. The structure and morphology analyses demonstrate the Ni nanoparticles have been deposited on the surface of SiC particles. The deposition behavior of Ni on the surface of SiC particles is investigated. Pd-Sn catalytic nuclei formed in the pretreatment process promote the redox reaction and lead to the reduction of Ni^2+ to metal nickel. Moreover, the kinetic mechanism of the reaction process of Ni%2+ and H2PO^-2 has also been discussed in detail. Kinetic models have been established. 相似文献
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We study the mechanism of microwave response properties of SiCv/paraffin nanocomposites and propose a mi- crowave absorption model of nanocomposites based on the conservation law of energy and the theory of electro- magnetic scattering. Using the model we calculate the reflectivity of SiCp/paraffin nanocomposites ranging from 2 GHz to 18 GHz. The calculated results are very consistent with the experimental data in the frequency range investigated. 相似文献
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Orientation-dependent electromagnetic properties of basalt fibre/nickel core--shell heterostructures 总被引:1,自引:0,他引:1 下载免费PDF全文
The influence of orientation on electromagnetic properties
of basalt fibre/nickel core--shell heterostructures prepared by a
simple electroless plating method is investigated. For comparison,
the same investigation is also performed on naked basalt fibres.
For electromagnetic measurement, the directions of basalt
fibre/nickel and naked basalt fibres are parallel, random and
perpendicular to the direction of external electric field, termed
E_\vert\vert sample, random sample and E⊥ sample,
respectively. Electromagnetic anisotropy can be clearly observed in
the basalt fibre/nickel core--shell heterostructures, while
electromagnetic properties of naked basalt fibres are unrelated to
the orientation. The E⊥ basalt fibre/nickel shows the
highest dielectric loss but the lowest magnetic loss, and E|| basalt fibre/nickel exhibits the highest magnetic loss but the lowest dielectric loss. The dielectric loss of E⊥
basalt fibre/nickel is several times as large as that of E|| basalt fibre/nickel, which could be attributed to the increase of polarization relaxation time as a consequence of the
nanosize-confinement effect. The magnetic loss of E||
basalt fibre/nickel is even one order of magnitude higher than that
of E⊥ basalt fibre/nickel, which originates mainly from
the natural magnetic resonance of basalt fibre/nickel core--shell
heterostructures. 相似文献
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