ABSTRACT
Nanomaterials often have unique optical, electronic or mechanical properties, but in addition to offering the intended benefits, they may also have unforeseen environmental, health and social risks. During the production and distribution of nanomaterials, laboratory researchers and factory workers may be exposed to nanoparticles before the product package is sealed. The hierarchy of control measures, a concept of risk management that is widely accepted in the societies of occupational safety and health, consists of an approach to risk reduction, and the elimination of the hazard of or exposure to nanomaterials. Conventional impactors have particle collection plates as the impaction surface, on which particles within a certain size interval are collected following inertial size separation. The particle laden gas enters the particle acceleration nozzles and accelerates, and only a part of the minor gas stream leaving the acceleration nozzles enters the particle collection nozzles.
