Highly disperse magnetic metal oxide particles, processes for their preparation and their use
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United States of America Patent
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Jul 7, 1998
Grant Date -
N/A
app pub date -
Jan 3, 1997
filing date -
Jul 7, 1994
priority date (Note) -
Expired
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Abstract
This invention relates to magnetic particles comprising mixed oxides of divalent metals and iron (III), having a diameter of 1-10 nm and a surface area of 120-350 m.sup.2 /g, with silanes bound to the surface of said particle. It also relates to (1) the process for making said particles by simultaneous precipitation and silanization from aqueous solution and (2) their use as carrier materials for the magnetic separation of substances immobilized therewith.
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