Superparamagnetic oxidic particles, processes for their production and their use
AssigneeDegussa AG
InventorsHeiko Gottfried, Christian Janzen, Markus Pridoehl, Paul Roth, Berthold Trageser, Guido Zimmermann
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Abstract
Pyrogenic, oxidic particles contain superparamagnetic metal oxide domains with a diameter of 3 to 20 nm in a non-magnetic metal or non-metal oxide matrix. The particles display a chloride content of 50 to 1000 ppm. The particles are produced by pyrogenic processes by mixing the precursor of the superparamagnetic domains and the precursor of the non-magnetic metal or non-metal oxide matrix in a flame with air and/or oxygen and fuel gas and reacting this mixture in a flame. The particles can be used as ferro fluids, for example.
Claims20
Pyrogenic, oxidic particles containing superparamagnetic metal oxide domains in a non-magnetic matrix comprising a metal oxide or a metalloid oxide, where each of the domains has a diameter of from 3 to 20 nm and where the chloride content of the particles is in a range from 50 to 1000 ppm.
Dependencies are inferred from the claim text.