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VARYUKHIN, V.; KHIZHENKOV, P.; MAKMAK, I.; SIROTKIN, V.; PANCHENKO, L.. Nano and Microparticles of Iron with a Modified Surface and Prospects for Their Application. Part II: Chemical and Galvanic Methods of Treatment of Iron Particles. In: Surface Engineering and Applied Electrochemistry. 2011, nr. 5(47), pp. 403-407. ISSN 1068-3755.
|Surface Engineering and Applied Electrochemistry|
|Numărul 5(47) / 2011 / ISSN 1068-3755 /ISSNe 1934-8002|
The possibility of the application of nano and microparticles of iron as the carriers for palladium and platinum catalysts are shown. An increase in the efficiency of the catalytic activity by 2–5 times is found to be reached by way of microstirring of the reaction medium using magnetic fields with a variable direction of the intensity gradient. The possibility of manufacturing composite materials of iron–silver and iron–gold is also shown, which can be used in electric engineering. The techniques for producing catalytic and conducting materials based on the chemical depositing of certain metals on iron particles are described. Galvanic methods were shown to be used for the development of metal shells on the particles of magnetic current conducting materials. The copper sliding contacts with microinclusions of graphite and iron manufactured using
the proposed methods are characterized by a specific electric resistance of ρ = 2–3 × 10–6 Ohm cm (for comparison, the specific electric resistance of graphite sliding contacts is ρ = 800 × 10–6 Ohm cm) at a simultaneous increase in the wear resistance and, as a consequence, in the service life by 12–15 times. The possibility of the chemical passivation of the surface of nano and microparticles of iron is shown to prevent their reacting with diluted nitric acid. Iron particles were studied to be used for obtaining contrasting X ray anatomical specimens of the intraosteal blood vascular system. A technological application of a magnetic field with a variable direction of the intensity gradient was proposed to increase the density of filling the capillary network with contrasting particles, which allows increasing the density of the filling of the intraosteal capillary network by up to 75% with respect to the volume.