Періодичні видання СумДУ
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Item Influence of the Substrate Temperature on the Size Distribution and Phase Composition of Ablated HfO2 Nanoparticles(Sumy State University, 2015) Panfilov, V.I.; Pugachevskii, M.A.; Kuzmenko, A.P.; Dobromyslov, M.B.The influence of the substrate temperature on the formation of high-temperature phases of hafnium dioxide in the process of pulsed laser ablation is investigated. It is established that the HfO2 nanoparticles of the high-temperature tetragonal and cubic phases with a quantitative content up to 50 % are formed on the surface of the substrate at room temperature during the laser ablation with intensity of 1010 W/m2. It is shown that with increasing the substrate temperature the average size of the ablated nanoparticles decreases and the quantitative content of the high-temperature phases is increased up to 70 %.Item The Hydrothermal Autoclave Synthesis of the Nanopowders of the Refractory ZrO2 and HfO2 Oxides(Sumy State University, 2015) Karpovich, N.F.; Pugachevsky, M.A.; Panfilov, V.I.; Kuzmenko, A.P.; Dobromyslov, M.B.The nanopowders of the transition metal ZrO2 and HfO2 oxides were obtained by the hydrothermal autoclave synthesis. The nanoparticles possess a rounded shape and a size range of 40 to 80 nm (ZrO2), of 10 to 40 nm (HfO2). X-ray diffraction analysis and electron microscopy show that the structure of the nanoparticles is monoclinic.Item Small Angle X-ray Scattering in Nanocomposite: Nanoparticles BaTiO3 with Modified Surface in Polystyrene(Sumy State University, 2015) Kuzmenko, A.P.; Chekadanov, A.S; Emelianov, N.A.By small angle X-ray scattering (SAXS) investigated the structure of polystyrene matrix composites filled by barium titanate nanoparticles with different volume fraction. Found that the percolation threshold for these systems is about 15 % of the content of the nanoparticles. Estimate the average distance between nanoparticles composites with different volume fraction.