Nanomaterials are defined as materials with at least one dimension (height, width, length, thickness, diameter) in the size range from approximately 1-100 nanometers.
At the nanomaterial level, some materials no longer behave as bulk materials (of greater size) but their properties obey the laws of atomic physics. Examples of nanomaterials are volcanic ash, quantum dots, metal and metal oxide nanoparticles, carbon nanotubes, fullerenes, etc.