Field and Laboratory Measurements Related to Occupational and Consumer Exposures - Safety of Nanomaterials along Their Lifecycle - page 295

Yang et al.
(2011)

High speed jet
milling

TiO 2 FESEM PSD, PNC The light and agglomeration behavior of aerosol nanoparticles

inluenced and limited the number concentration distribution of
nano-TiO 2 aerosols in the workplace, while the dispersive forces on
the aerosol nanoparticles from the discharging port had a profound
inluence on the light and agglomeration of the particles.
Agglomerated particles were the most frequently found form of
aerosol particles, with a high number concentration in the
workplace. Primary particles of the nano-TiO 2 aerosol (70 nm)
reached a relatively high concentration at a height of 1.5 m (in the
breathing zone), after a working time of 2 h, but exhibited lower
concentrations at other working times. With the aerosol enclosure,
a distinct reduction in the aerosol concentrations was observed for
all diameter ranges. Furthermore, with the help of the aerosol
enclosure, the diameter of agglomerated aerosol particles increased
from the mode diameter of 124 nm to 175 nm

Abbreviations: PSD, particle size distribution; PNC, particle number concentration; SA, surface area; M, mass; NAPD, number-averaged particle diameter.