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A 'nanostructure' is an intermediate size between molecular and microscopic (micrometer-sized) structures.
In describing nanostructures we need to differentiate between the number of dimensions on the nanoscale. Nanotextured surfaces have 'one dimension' on the nanoscale, i.e., only the thickness of the surface of an object is between 0.1 and 100 nm. Nanotubes have 'two dimensions' on the nanoscale, i.e., the diameter of the tube is between 0.1 and 100 nm; its length could be much greater. Finally, spherical nanoparticles have 'three dimensions' on the nanoscale, i.e., the particle is between 0.1 and 100 nm in each spatial dimension. The terms nanoparticles and ultrafine particles (UFP) often are used synonymously although UFP can reach into the micrometre range.
In describing nanostructures we need to differentiate between the number of dimensions on the nanoscale. Nanotextured surfaces have 'one dimension' on the nanoscale, i.e., only the thickness of the surface of an object is between 0.1 and 100 nm. Nanotubes have 'two dimensions' on the nanoscale, i.e., the diameter of the tube is between 0.1 and 100 nm; its length could be much greater. Finally, spherical nanoparticles have 'three dimensions' on the nanoscale, i.e., the particle is between 0.1 and 100 nm in each spatial dimension. The terms nanoparticles and ultrafine particles (UFP) often are used synonymously although UFP can reach into the micrometre range.
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