Figure 1
From: Why are nanomaterials different and how can they be appropriately regulated under REACH?
![Figure 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F2190-4715-26-4/MediaObjects/12302_2013_Article_115_Fig1_HTML.jpg)
Schematic illustration of different forms of a substance. (i) Bulk form with different surface modifications; (ii) bulk form and nanoforms of the same substance, nanoforms shown with different sizes and different surface modifications; (iii) nanoforms of a substance with different sizes without having a corresponding bulk form (e.g. fullerenes, carbon nanotubes).