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O. I. Vernaya, A. V. Peisikova, M. K. Fuki, V. P. Shabatin, T. I. Shabatina
The effect of the reaction conditions on
the formation of iron nanoparticles during the reduction of iron (III) with
sodium borohydride
Abstract
Iron
nanoparticles were obtained by reducing of iron (III) chloride with sodium
borohydride in aqueous solutions at room temperature without using stabilizing
agents. For this method of synthesis by the methods of X-ray phase analysis,
BET specific surface area and transmission electron microscopy, the effect of
the concentration of reagents, the molar ratio of the reagents, the ultrasonic
effect and the inert atmosphere (Ar) on the size and composition of the
obtained particles was established. The results showed that, depending on the
synthesis conditions, borohydride reduction of iron salts in aqueous solution
leads to the formation of either agglomerates 200–800 nm of iron nanoparticles
(5–100 nm) or zero-valent iron colloidal solutions (1–20 nm). The presence and
concentration of wustite and magnetite in the composition of the obtained
particles is determined mainly by the concentration of the reducing agent in
reaction mixture.
Key words: nanoparticles, iron, borohydride
method, size, composition.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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