Registration Number
0225U000521,
(0124U000455)
, R & D reports
Title
Magnetoelastic effects and magnetic field induced critical deformations of magnetoactive elastomers
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Синтез магнітних нанопорошків
Head
Dzhezherya Yuriy Іvanovich, Доктор фізико-математичних наук
Registration Date
13-01-2025
Organization
Institute of Magnetism NAS of Ukraine and MES of Ukraine
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The purpose of the project is to study the effects of magnetoelasticity and critical deformation phenomena of magnetoactive elastomers caused by their magnetization and moderate thermal effects, which are caused by the samples shape anisotropy, induced material anisotropy, and phase transitions in the magnetic filler of magnetoactive elastomers.
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It has been found that under the action of an applied magnetic field, the change in the shape of the studied sample of a magnetoactive elastomer (MAE) (in this case, bending) with superparamagnetic (coercive-free) manganite nanoparticles La0.8Ag0.2Mn1.2O3 occurs mainly due to elastic deformations of the MAE matrix, and when the field is removed, the shape of the MAE is almost completely restored. It is demonstrated that the uncertainty for the direction of beam bending in the case of a sample with almost completely hysteresis-free superparamagnetic nanoparticles is removed due to the residual bending of the beam after the first input-output of a transverse uniform magnetic field. It is shown that the magnitude of the contribution to bending from plastic deformation is directly proportional to the square of the magnetic field strength, which explains why, due to the residual bending, there is no change in the sign of bending upon inversion of the field sign. The structure, morphology, particle size distribution and magnetic phase transitions, as well as the magnetic, magnetocaloric and electrochemical properties of La0.6Sr0.4CoO3 nanopowders obtained at different annealing temperatures tann = 850, 875 and 900°C were studied. The obtained series of La0.6Sr0.4CoO3 nanomaterials demonstrated excellent electrocatalytic characteristics for the oxygen evolution reaction process in the electrolyte. Parallel study of the physical and electrocatalytic properties of nanopowders allowed to establish the physicochemical basis of different samples obtained at different annealing temperatures and to find ways to obtain materials for practical application in electrocatalysis.
Product Description
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Ihor V. Herasymchuk
Kalyta Viktor M.
Krаvets Anаtolii F.
Kuzmak Orest M
Pashchenko Oleksii V.
Pavlo Y. Polynchuk
Reshetniak Serhii O.
Skyrta Yurii B.
Ihor V. Fesych
Khist Viktoriia V
Cherepov Serhii V.
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2025-01-13
