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Nanoparticlesthatarenaturallyoccurring(e.g.volcanicashorsootfromforestfires)oraretheincidentalbyproductsofcombustionprocesses(e.g.welding,dieselengines)areusuallyphysicallyandchemicallyheterogeneous,andareoftentermedultrafineparticles.
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Engineerednanomaterialsareartificiallyproduced,anddesignedwithveryspecificpropertiesrelatedtotheirshape,size,surface,andchemistry.
Unbound engineered nanoparticles (UNP) are engineered nanomaterials that, under normal temperature and pressure conditions, are not contained within a matrix that would reasonably be expected to prevent the particles from being separately mobile and a potential source of exposure.
There is no need for new methodologies to quickly assess the presence and reactivity of nanoparticles in commercial, environmental, and biological samples since current detection techniques require expensive & complex analytical instrumentation.
The ideas and concepts behind nanoscience and nanotechnology started with a talk entitled "There's Plenty of Room at the Bottom" by physicist Richard Feynman at an American Physical Society meeting at the California Institute of Technology (CalTech) on Dec 29, 1969, long before the term 'nanotechnology' was used.
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