Speaker
Dr
Alexander Syugaev
(Udmurt Federal Research Center, Ural Branch of Russian Academy of Sciences 132 Kirov Street, 426000 Izhevsk, Russia)
Description
High-energy ball milling of metals in organic media makes it possible to modify the chemical composition of both the surface and the bulk of particles, including modification by chemically inert substances. As-modified particles may be potentially used for various composite materials, for example, microwave absorbing magnetodielectric composites. In this work, synchrotron radiation study of iron particles mechanochemically modified under their ball milling with various polymers (polystyrene, polydiene, paraffin) and surfactants (stearic acid and perfluorononanoic acid) have been carried out. XANES and EXAFS spectra measured at the iron K edge in the transmission mode were used to analyze the transformation of the local atomic environment of iron atoms in the bulk of particles (formation of a nanostructure, carbide formation) [1, 2]. The iron K edge XANES and EXAFS spectra, as well as carbon K edge, fluorine K edge, and Fe L2,3 edge NEXAFS spectra measured in the total electron yield mode allowed us to analyze in detail the chemical transformation taking place in a thin surface layer of particles, including the processes of destruction, adsorption of organic molecules and formation of chemical crosslinking between different molecules in the surface layer [1-5]. For plate-like particles prepared in the presence of surfactants, polarization dependences of NEXAFS spectra were obtained, analysis of which made us to reveal the features of spatial arrangement of the molecules in the surface layer of the particles and its transformation during processing [1-4].
This study was supported by the Federal Agency for Scientific Organizations (No. AAAA-A17-117022250038-7), Scientific Program of UB RAS (No. 18-10-2-21) and bilateral Program "Russian-German Laboratory at BESSY II", HZB Berlin.
References:
1. A.N. Maratkanova et al. Powder Technol. 274 (2015) 349-361.
2. A.V. Syugaev et al. Colloid Surface A 540 (2018) 53-66.
3. A.V. Syugaev et al. Surf. Coat. Technol. 236 (2013) 429-437.
4. A.N. Maratkanova et al. J. Phys. Chem. C 116 (2012) 14005-14013.
5. S.F. Lomayeva et al. J. Alloys Compd. 721 (2017) 18-27.
Primary author
Dr
Alexander Syugaev
(Udmurt Federal Research Center, Ural Branch of Russian Academy of Sciences 132 Kirov Street, 426000 Izhevsk, Russia)
Co-authors
Dr
Alena Maratkanova
(Udmurt Federal Research Center, Ural Branch of Russian Academy of Sciences 132 Kirov Street, 426000 Izhevsk, Russia)
Dr
Anatoly Shakov
(Udmurt Federal Research Center, Ural Branch of Russian Academy of Sciences 132 Kirov Street, 426000 Izhevsk, Russia)
Prof.
Svetlana Lomayeva
(Udmurt Federal Research Center, Ural Branch of Russian Academy of Sciences 132 Kirov Street, 426000 Izhevsk, Russia)
