User:Sunadaram

The definition of NT is subject to some confusion and controversy, and is complicated by the fact that there are naturally occurring nano-size materials and other nano-size particles that occur as byproducts of combustion or industrial processes. Size is critical in any definition of NT, but there are a variety of definitions in circulation. Some of the differences over definition are of only academic interest,but the way NT is defined in a regulatory context can make a significant difference in what is regulated, how it is regulated, and how well a regulatory program works.

http://nanotech-world.blogspot.com