with the critical size range (or particle diameter) typically ranging from nanometers (10^-9 m) to micrometers (10^-6 m). Colloids can contain particles too large to be nanoparticles, and nanoparticles can exist in non-colloidal form, for examples as a powder or in a solid matrix.

History

Natural occurrence

Nanoparticles are naturally produced by many cosmological, geological, meteorological, and biological processes. A significant

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