There is a Nanoparticle Information Library (NIL), designed to help occupational health professionals share information on naonparticles, especially their health impact. NIL is from NIOSH, the (US) National Institute for Occupational Safety and Health. You can do a quick search, or search by structure (film, nano rod, quantum dot, and so on) or element. NIL at the moment has links to other NIOSH resources on nanotechnology.
NIL is at http://www2a.cdc.gov/niosh-nil/