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Preparation of Iron Particles Coated with Silica

✍ Scribed by Guihua Wang; Andrew Harrison

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
119 KB
Volume
217
Category
Article
ISSN
0021-9797

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✦ Synopsis

Preparation of Iron Particles Coated with Silica

A method is described for coating fine iron particles (ϳ1 m) with a uniform silica layer, produced by the hydrolysis of tetraethyl orthosilicate. The presence of a small amount of gelatin on the surface of the iron particles facilitates this process. X-ray photoelectron measurements indicate that the gelatin interacts with the surface of the iron particles through both nitrogen (in -NH 2 groups) and oxygen (in -COOH groups) and then binds to the silica. The silica coating increases the resistance of the iron particles to oxidation on heating in air, raising the temperature at which a detectable oxidization occurs from 330 to 400°C.

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