题目内容
Nanomaterials(nanoparticles)arematerialsorparticleswithanyexternaldimensioninthenanometerscale(from1nmto100nm)orhavinginternalorsurfacestructuresinthenanometerscale.
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Nanoparticlesthatarenaturallyoccurring(e.g.volcanicashorsootfromforestfires)oraretheincidentalbyproductsofcombustionprocesses(e.g.welding,dieselengines)areusuallyphysicallyandchemicallyheterogeneous,andareoftentermedultrafineparticles.
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.
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