Search academic texts

Information × Registration Number 0219U003358, 0118U000246 , R & D reports Title Development of new polymeric nanocomposites with hybrid fillers with controllable electrophysical properties as elements of microwave equipment. popup.stage_title Head Matzui Ludmika, Registration Date 11-02-2019 Organization Taras Shevchenko Kiev University popup.description2 The object of the study is hybrid carbon-inorganic materials based on carbon nanotubes and inorganic nanoparticles with high dielectric or magnetic permeability. It has been proved for the first time that the temperature dependence of the electrical support for composites with hybrid fillers (BaFe12O19, Fe3O4), as well as with the carbon mono filler, is well described in the model of tunneling of current carriers induced by thermal fluctuations. For the first time, the influence of an additional dielectric magnetic filler, its morphology and structure on the peculiarities of electromagnetic radiation response of hybrid carbon-inorganic materials in the frequency range 1-60 GHz was found. On the basis of the comparative analysis of the protective properties of composite materials, the carbonaceous / Fe3O4 / epoxy resin with random and approximate distribution of fillers shows, first, that the absorption coefficient of composite materials with hybrid filler increases, the second decrease of the coefficient of electromagnetic radiation for oriented composite materials refiners for the case of collinear orientation of fillers (along the external magnetic field 0 H) and the vector of the electric field of electromagnetic radiation E in comparison with the composite with random distribution of the filler. For the first time, the effective losses of electromagnetic radiation up to 17 GHz at frequencies above 20 GHz were achieved in hybrid composites of carbon nanotubes / epoxy resins with additional fillers Fe3O4 and BaFe12O19, in the thickness of 0.6-0.8 mm. It has been shown that both the magnitude of effective losses and the frequency range of effective electromagnetic radiation of the response can be managed guided by selecting the concentration of carbon nanotubes and the type of additional magnetic filler in the hybrid composites and the thickness of the samples. Product Description popup.authors Вовченко Л.Л. Журавков А.В. Лазаренко О.А. Лаунець В.Л. Лень Т.А. Мацуй Л.Ю. Перец Ю.С. Турков О.В. Яковенко О.С. popup.nrat_date 2020-04-02 Close