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Nanoparticles can be formed in several different ways. One of the most common ways is attrition. Attrition is a process in which macro or micro scale particles are “ground up” in a ball mill and then air classified to recover oxide nanoparticles. Another common way to produce nanoparticles is pyrolysis. During pyrolysis (also called flame spray pyrolysis or chemical vapor condensation), an organic liquid or gas is forced through an orifice at high pressure and is then burned. Then, the ash that is left is air classified to produce oxide nanoparticles.
