Effective permittivityin the matrix dispersed systems with two-layered inclusions
DOI:
https://doi.org/10.31548/energiya2018.05.195Abstract
Currently, the dispersed systems (DS) with inclusions of different nature and form are of great interest. Examples of such systems are matrix-disperse systems (MDS) with spherical bimetal nanoparticles of noble metals such as the silver core - gold shell, or vice versa - the golden core - the silver shell. The urgency of the study is connected, first of all, with the possibility of using the special properties of various disperse systems for the creation of composite materials based on them with electrodynamic, thermophysical and elastic properties, predetermined.
The purpose of the study is to calculate the frequency dependences of effective dielectric permittivity for MDS with double-layer ball inclusions with a conducting anisotropic film.
The main task of finding dielectric losses in the MDS is the calculation of the frequency dependence of the imaginary part of the effective dielectric permittivity in such systems, taking into account their composition and structure, and the subsequent calculation of the magnitude of dielectric losses.
The methods for calculating the absorption of electromagnetic radiation (EMF) in matrix disperse systems (MDS) with multilayer inclusions (in our case, the two-layers) are demonstrated on a model system of a two-layer spherical particle with a film of adsorbed water placed in a matrix with a certain dielectric constant.
The analytical dependences of the effective dielectric constant of the system on the relative contribution of the volume of water in a separate aerosol particle and the filling degree, which completely solve the problem of dielectric losses in such disperse systems, were obtained.
In the Maxwell-Garnett approximation, a detailed analysis of the dependences of the effective dielectric constant on the frequency of the external field and on the system parameters was carried out. Dielectric losses in matrix disperse systems with two-layer ball inclusions are calculated. It follows from the obtained results that dielectric losses are observed at the level of Ohm-1 conductors (experimental value), the degree of filling and the volume of water in the frequency range Hz.
Keywords: dielectric loss, matrix dispersion systems, the effective dielectric constant
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