Classifying Nanotechnology

In these days I was looking for a good way to classify nanotechnology for the groups I'm creating on simpy and diigo , I know that the basic idea of folksonomy is that everyone choses it's own tags and if there are enough people tagging, than there will be good tags for everyone. Anyway I'm starting this nanotechnology tagging groups alone, and I would like to suggest some specific tags.
Recently I found out that this problem has been solved about an year ago by the
European Patent Office. They identified 6 main (partially overlapping) fields:
Y01N2 Nanobio
Y01N4 Nanoelectronics
Y01N6 Nanomaterials
Y01N8 Nanotools
Y01N10 Nanooptics
Y01N12 Nanomagnetics

There is a definition for all of these fields in the esp@cenet portal, but they are of not immediate interpretation because they cross refer to other patent classifications, so I'll write down some less accurate but more user friendly definitions in the next weeks.