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Registration Number

0222U000468, 0120U002090 , R & D reports

Title

Development of synthesis methods of polymetallic nanostructures based on d-elements for electrically conductive compositions and catalytic nanosystems

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Head

Kytsia Andrii R,

Registration Date

10-01-2022

Organization

Department of Physical and Chemistry of Combustible Fossils LM Litvinenko of the National Academy of Sciences of Ukraine

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The influence of the ratio of reagents on the kinetics of formation of bimetallic nanoparticles "nickel-cobalt" was studied. It was established that the rate of nucleation of Ni-Co-NPs linearly depends on the concentration of nickel in the initial reaction mixture, i.e. the formed nickel nanoparticles are promoters of cobalt reduction. Using scanning electron microscopy and energy-dispersive X-ray spectroscopy it was found that the size of the obtained Ni-Co-NPs decreases with increasing of cobalt content up to 50%, but at a ratio of Ni / Co = 27/75 formed nanopowder consists of two fractions of particles - 100 nm and 2 μm and particles with a size of 100 nm contain Ni and Co in equivalent amounts but micron-sized particles are enriched in cobalt. Polymetallic nanocomposites Ni-Pd and Ni-Co-Pd were obtained by the method of galvanic replacement. It was established that the kinetics of palladium cementation by nickel nanoparticles and bimetallic Ni(50)-Co(50) nanoparticles is described by the first-order equation for Pd2+. It was found that palladium crystallizes in the form of lamellar agglomerates. It is established that the obtained product consists of two phases - solid solution of Ni and Co and palladium. It was found that anisotropy of the crystal lattice is observed for the Pd phase, which is probably caused by the lamellar form of palladium agglomerates. By the method of cementation of silver with Ni(50)-Co(50) nanoparticles, ternary Ni-Co-Ag nanocomposites were obtained. It has been established that silver crystallizes in the form of Barnsley fractal, the "petiole" of which "grows" from agglomerates of Ni(50)-Co(50) nanoparticles. It was found that the growth of the silver fractal occurs as a result of dissolution of distant Ni(50)-Co(50) nanoparticles due to electron transfer in agglomerates to nanoparticles that are not in direct contact with the growing fractal.

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Antonyshyn Iryna S
Bazylyak Liliya I
Balashova Iryna Ye
Dozhdzhanyk Veronika V
Koretskaya Natalia I
Lysyak Viktor M
Maksym Dariya Stepanivna
Opeida Josyp Oleksiyovych
Pilyuk Yaroslav V
Pokynbroda Tetyana Ya.
Fedorchuk Anatoliy O

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2022-03-09