For obvious reasons, toxic substances are a no-go area for new medical methods. But everyone wants a piece of the nanotube action, so researchers at the University of California have been coating them with synthetic polymers that mimic molecules found in the human body. A big step along from sugar-coating the pills.
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The big deal in coating nanotubes is getting the tubes appart so the coating material can get in contact with the somplete surface of the nanotubes. For this an efficient deagglomeration of the tubes is required. For more information you may want to look at: http://www.hielscher.com/ultrasonics/nano_03.htm.