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AssigneeStudiengesellschaft Kohle mbH
InventorsHelmut Bonnemann, Werner Brijoux, Rainer Brinkmann, Nina Matoussevitch, Norbert Waldofiner
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The invention relates to monodispersable, optionally magnetic particles containing one or more metals, optionally, protected by a secondary treatment with air, having an adjustable average particle size of between 2 and 15 nm and a narrow distribution of particle size with a standard variance of 1.6 nm at the most. The invention also relates to a method for the production of said materials. Said materials are used in an isolated form or dispersed in a solution inter alia as a sealing medium against dust and gas in magnetic fluid sealing systems (liquid O-ring) for the lubrication and bearing of rotating shafts (magnetic levitation bearings), for the magneto-optical storage of information and additionally, for the magnetic marking of cells and the separation thereof in biological samples or for the local application of medicaments.
A process for the preparation of magnetic particles, characterized in that the magnetic particles are produced by decomposition of low-valency compounds of the metals of the magnetic particles in the presence of an organometallic compound of a metal of group 13.
A monometallic or polymetallic magnetic particle having a mean particle size, determined by TEM, of between 2 and 15 nm and a particle size distribution with a standard deviation of not more than 1.6 nm.
Dependencies are inferred from the claim text.