Журнал нано- та електронної фізики (Journal of nano- and electronic physics)
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Item Influence of Structural Features and Physico-chemical Properties of Metal-carbon Nanocomposites with Ferromagnetic Metal Inclusions on Microwave Radiation(Sumy State University, 2014) Kozhitov, L.; Kuzmenko, A.; Muratov, D.; Rodionov, V.; Popkova, A.; Yakushko, E.; Dobromyslov, M.Metal-carbon nanocomposites on the basis of polyacrylonitrile and compounds of metals (Fe, Ni, Co) synthesized at IR-heating and studied by SEM, X-ray phase analysis, Raman scattering, IR Fourier spec-troscopy are characterized by the carbon nanostructured amorphous graphite matrix with uniformly dis-tributed nanoparticles of metals (10-30 nm), their oxides and compounds – FeNi3 and FeCo, multilayered carbon nanotubes (~ 7-22 nm), and in the composition of Fe-Co / C fullerene-like formations – C60. All nanocomposites feature high absorption of electromagnetic waves in the frequency range 20-40 GHz. Two absorption mechanisms are proposed: dielectric loss in the amorphous carbon matrix and scattering of electric and magnetic components by ferromagnetic inclusions. Absorption was – 8.68 dB for Fe-Ni / C, – 12.93 dB for Fe / C, and – 7.07 dB for Ni / C and for Fe-Co / C was found to be maximum in the whole range studied (more than – 40 dB) with a peak of – 52.83 dB at 24.27 GHz, which is explained probably by both high nanocomposite electric conductivity 2 S / m and high specific magnetization of phase FeCo. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/36259Item Atomic Force Analysis of Elastic Deformations of CD(Сумський державний університет, 2013) Kuzmenko, A.; Kuzko, A.; Timakov, D.; Dobromyslov, M.The procedure for the determination of elastic parameters according to reference nanometer lithographic marks by atomic force microscopy on samples with up to microscopic sizes is proposed. Analysis of dynamic changes of elastic characteristics that makes it possible to establish the critical rotation velocity of a CD without plastic deformations has been made. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/33672Item Kinetic Characteristics, Phase and Structural Changes in Electrical Materials and Devices(Сумський державний університет, 2013) Kuzmenko, A.; Grechushnikov, E.; Kharseev, V.; Dobromyslov, M.Electron-microscopic and X-ray studies have revealed that the ability of lead-acid storage batteries to adopt charge due to physico-chemical processes occurring in the lead paste and on the border of the “shunt-paste” depends dramatically on both the initial moisture content in the lead paste and keeping enhanced humidity in the exposure chamber for plates. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/33653Item Mechanisms of Microwave Absorption in Carbon Compounds from Shungite(Сумський державний університет, 2013) Emelyanov, S.; Kuzmenko, A.; Rodionov, V.; Dobromyslov, M.According to SEM, X-ray phase analysis, Raman scattering data features of nanostructural changes in shungite carbon structure were found when processing shungite in 52 % hydrofluoric acid. It is found that conductivity increases up to the values of electrical graphite and absorption of microwave radiation also increases at frequencies up to 40 GHz, which, along with dielectric losses, is due to intense processes of both scattering at laminar carbon structures and absorption of electromagnetic energy. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/33650