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Nano ?

Definitions

Nano-objects (particles, fibers, plates, tubes,...) are entities with at least one dimension is smaller than 100 nanometers. These entities are the basis for the formation of nano-structured materials on the surface or in volume. They are passive or active as nanodevices. This website deals the risks associated with nanomaterials without covering the wider field of nanotechnologies.
Cartoons Episode 1

Nanomaterials

Various definitions of the word “nanomaterial” exist:

  • the definition of ISO [ISO TS/80004-1, TS/80004-2 and ISO TS 27687], a nanomaterial is a “material with any external dimension in the nanoscale or having internal structure or surface structure in the nanoscale”,
  • for the European commission a nanomaterial means “a natural, incidental or manufactured material containing particles, in an unbound state or as an aggregate or as an agglomerate and where, for 50 % or more of the particles in the number size distribution, one or more external dimensions is in the size range 1 nm - 100 nm. In specific cases and where warranted by concerns for the environment, health, safety or competitiveness the number size distribution threshold of 50 % may be replaced by a threshold between 1 and 50 %. By derogation from the above, fullerenes, graphene flakes and single wall carbon nanotubes with one or more external dimensions below 1 nm should be considered as nanomaterials”.