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Nanomaterials or nanoparticles are human engineered particles with at least one dimension in the range of one to one hundred nanometers. They can be composed of many different base materials (carbon, silicon, and various metals).
Naturally created particles of this size range are normally called ultra-fine particles. Examples are welding fumes, volcanic ash, motor vehicle exhaust, and combustion products.
Nanomaterials come in many different shapes and dimensions, such as:
Nanoparticles exhibit very different properties than their respective bulk materials, including greater strength, conductivity, fluorescence and surface reactivity.
