Iron oxide particles

Iron oxide particles are available with hydrodynamic diameters of 50 nm and 250 nm, respectively.
The surface of the 50 nm particles is colloidal stabilized with carboxylic acid groups. The particles possess nearly no sedimentation tendency and cannot be separated with conventional permanent magnets. These iron oxide particles are also available with a phospholipid surface resulting in particles with a hydrodynamic diameter of 70 nm. For magnetic separation a high gradient magnetic system is recommended.
The 250 nm iron oxide particles consist of monodisperse magnetite aggregates and can easily be separated with permanent magnets. They possess a low tendency of sedimentation and are also available with gold labeling.

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References
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