Process for the controlled preparation of a composite of ultrafi

Details Process for the controlled preparation of a composite of ultrafi Process for the controlled preparation of a composite of ultrafi

1990-03-28

1994-05-31

Tucker, Philip

Compositions

Light transmission modifying compositions

Inorganic crystalline solid

252582, 252587, 252588, 2523156, 524429, 524431, 524588, G02B 520, B01J 1300, C08L 8300

Patent

active

053166990

ABSTRACT:
A chemical process for producing bulk quantities of an iron-silica gel composite in which particle size, form, and magnetic state of the iron can be selected. The process involves polymerizing an ethanolic solution of tetraethylorthosilicate, ferric nitrate and water at low temperature under the influence of an HF catalyst. The chemical and magnetic states of the iron in the resultant composite are modified in situ by exposure to suitable oxidizing or reducing agents at temperatures under 400.degree. C. Iron-containing particles of less than 200 .ANG. diameter, homogeneously dispersed in silica matrices may be prepared in paramagnetic, superparamagnetic, ferrimagnetic and ferromagnetic states.

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