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Effects of Irradiation with Low-Energy and High-Energy Krypton Ions on the Structure of TiCrN Coatings

100%
Kislitsin S., Gorlachev I., Uglov V.
Acta Physica Polonica A
|
2015
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vol. 128
|
issue 5
818-823
EN
The results of surface structure investigations of TiCrN coating on carbon steel after irradiation by high- and low energy krypton ions and successive two-hour vacuum annealing are reported in the present publication. Specimens with the TiCrN coatings of the 50÷100 nm thickness were formed by vacuum arc deposition techniques. The prepared specimens were irradiated by low energy (280 keV) and high energy (125 MeV) krypton ions. Study of surface structure was done by scanning electron microscopy and atomic force microscopy. X-ray diffraction and the Rutherford backscattering spectrometry were applied for determination of structure and coating thickness. After irradiation by high energy Kr ions there appear convexities of spherical shape with dimensions 10÷30 nm on the surface of the coating. Subsequent two-hour vacuum annealing led to decrease of convexities dimensions. Irradiation by low-energy Kr ions does not lead to significant changes in the structure of the coating surface. Only traces of surface sputtering are found. Explanation of the observed surface damage is proposed. Convexities are the traces of ions passing through coating and appear due to structural reconstruction at energy release along a trajectory of ions braking. As the projective range of high energy Kr ions exceeds coating thickness, then damage of structures is generated in the substrate and convexities are the traces of undersurface damages.
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Temperature Dependent Catalytic Activity of Ag/PET Ion-Track Membranes Composites

76%
Borgekov D., Mashentseva A., Kislitsin S., Kozlovskiy A., Russakova A., Zdorovets M.
Acta Physica Polonica A
|
2015
|
vol. 128
|
issue 5
871-874
EN
Electroless deposition has been used to coat finely porous polyethylene terephthalate (PET) track-etched membranes with silver, forming silver nanotubes within the pores with inner and outer diameters of 60 and 100 nm. The sample's X-ray diffraction pattern shows a face-centered cubic crystalline phase of silver with the lattice constant 4.0838 nm. The average size of silver nanoclusters, as obtained from the scanning electron microscopy analysis is about 30 nm which is consistent with the X-ray diffraction results. The temperature dependent catalytic activity of prepared composites is demonstrated for two model reactions such as reduction of 4-nitrophenol (4-NP) and decomposition of hydrogen peroxide. Apparent constant rates and activation energy as well as reusability of catalysts were determined. The developed composite catalyst could be used consecutively for several runs without any damages for 4-NP reduction. For hydrogen peroxide reaction decomposition the reaction rate of the second cycle is reduced 2.4 times. Moreover, the second reuse reduced conversion of H₂O₂ to 54.7% suggests removal of active Ag centers during the first cycle of testing.
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