Simulation of Dielectric Properties of Nanocomposites with Non-Uniform Filler Distribution

Abstract

Dielectric properties for nanocomposites with metallic fillers inside a polymer matrix were determined using CST STUDIO SUITE—Electromagnetic field simulation software followed by the free-space Nicolson–Ross–Weir procedure. The structure is randomly generated to simulate the intrinsic non-uniformity of real nanomaterials. Cubic insertions were equated to corresponding spherical particles in order to provide either the same volume index or the same exterior surface index. The energy concentration around the inserts and within the entire material was determined as useful information in practice in order to design materials tailored to avoid exceeding the field/temperature limit values. The paper successfully associated the dialectic measurements with the results from the computer simulations, which are mainly based on energetic effects in electromagnetic applications. The experimental results are comparable with the software simulation in terms of precision. The conclusions outline the practical applications of the method for both electromagnetic shielding and microwave domain/telecommunications applications.

Flexible Electromagnetic Shielding Nano-Composites Based on Silicon and NiFe2O4 Powders

“…This aspect is explained by the internal architecture of the composite, i.e., the balance between the powder content and powder dimension, which is also correlated to the high increase in the conductivity at the GHz domain, even if the polarization effect is diminished. The study of such effects at the micro-scale and correlation with composition and architecture may be further studied as described in [60].…”

“…The development of broadband shielding composites for the microwave domain is a very new direction of research, and up to now only pure ceramic composites were studied, e.g., FeNi 3 /NiZnFe 2 O 4 /ZnO composite in [61], with clear drawbacks related to synthesis and final shaping technology, so ferrite-rubber composites, would be a good candidate for such applications, as our study emphasizes. Based on the theory from [60], a simulation is briefly presented in Figure 13-power loss density (proportional with SE A ) in inhomogeneous composites with ferrites, here for sample S2, at 0.1 GHz and 3 GHz, respectively. The higher intensity of color for the 3 GHz diagram and activity of insertions can be noticed, along with the clear increase in absorbed power in Wm −3 compared to the diagram for 0.1 GHz.…”