Fig. 2From: Inhaled nanomaterials and the respiratory microbiome: clinical, immunological and toxicological perspectivesSchematic illustrating the relative dimensions of nanoparticles with examples of each category. Nanomaterials (NMs) exist in different dimensionality and current classification schemes of nano-structured materials (NSM) are proposed as zero (OD), one (1D), two (2D) and three dimensional (3D). 3D nanocomposites form when two or more materials with individual properties act synergistically to create a composite with unique propertiesBack to article page