Anticorrosive magnetic nanocolloids protected by precious metals
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United States of America Patent
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Dec 10, 2002
Grant Date -
N/A
app pub date -
Aug 11, 2000
filing date -
Feb 14, 1998
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Expired
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Abstract
The invention relates to new single- or multi-metallic magnetic colloid particles (for example, Fe, Co, Ni, Fe/Co) having a size of up to 20 nm, the surface of which is protected against corrosion by precious metals, such as Pd, Ag, Pt or Au. The invention also relates to a method for producing such materials. In isolated form or in solution said materials are used among other things as sealing media against dust and gas in magnetic fluid seals (liquid O ring), for lubricating and mounting rotating shafts (magnetic levitation bearing), for the magnetooptic storage of information as well as for the magnetic marking of cells and their separation in biological samples or for the local administration of medicines.
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