Synthesis of Al2O3 nanoparticles for their subsequent use as fillers of polymer composite materials

Estimation of the thermophysical properties of heat-protective composite materials

“…A modern methodology for solving inverse coefficient problems is proposed in [32][33][34][35][36][37]. The works [38][39][40][41][42][43][44][45][46][47][48][49] also solve direct problems of determining temperature fields in composite materials characterizing by significant anisotropy of properties, using both analytical and numerical methods, as well as describe experiments to determine the properties of composite materials. In this paper, we consider a composite material in which the matrix is air, and inclusions are cylindrical fiber inclusions.…”

Study of high-frequency magnetic properties of composites and multi-layer films

“…When the dipole-dipole interaction energy becomes greater than kT, where T is the measurement temperature, the heterogeneous system transits to a magnetically ordered state. In this case, the individual particles can have their own anisotropy field directions due to different mechanisms (the particle shape, the direction of the crystallographic axes, the ordering of atom pairs in a single grain, the magnitude and direction of local stresses at the dielectric-magnetostrictive ferromagnetic particle interface), which leads to a significant dispersion of the fields of local anisotropy in the film [38][39][40][41][42].…”

“…In the region of significant metal phase concentrations, the composite can be considered as a bulk material with nanoscale dielectric inclusions [43][44][45][46]. In such a structure, the dispersion of local anisotropy fields is relatively low, and the imaginary part of the complex magnetic permeability (μ // ) has small values.…”

Synthesis and dielectric properties of metal-ceramic nanostructures

“…This behaviour of multilayer structures can be explained by assuming that the charge transfer in composite layers whose composition is up to the percolation threshold is not through the dielectric phase but through a lower resistive semicon- ductor interlayer. On the other hand, in composites after the percolation threshold, where an infinite network of adjoining metal granules is formed, the channel resistance increases due to the interaction of silicon with the metal phase and the formation of iron and cobalt silicides, which have a higher resistivity than that of pure metals [39][40][41][42][43][44][45][46]. When the thickness of the composite becomes significant, the effect of silicides on the electrical transfer process in (Co45Fe45Zr10)x(Al2O3)1-х after the percolation threshold is reduced.…”