奈米微粒與健康風險研究─總計畫暨子計畫一：可控制粒徑分布型態奈米氣懸微粒產生技術之研究(III)(2/2)
Date Issued
2005-07-31
Date
2005-07-31
Author(s)
鄭福田
DOI
932621Z002001
Abstract
Filtration is a convenient and popular way in collection particles from gas stream. It is a
effective way in both micron sized particle as well as nanoparticle by different mechanism.
Collection efficiency and pressure drop are the major concerns in applying filter.While
micron sized particle loading of filter were studied by some researchers, nanoparticle loading
was not studied before. A nanoparticle generator composed of Electrospray aerosol generatorwas developed to generate a stable aerosol source which size distribution was controllable.
The aerosol generator could supply as high as 106#/cm3 to speed up loading test. It was
utilized to generate both monodispersed and bi-modal distribution challenge aerosol in
membrane filter loading test. In this work, a PVC membrane filter with 5 μm pore was used
in evaluating the pressure drop versus particle loading.
The loading curve of monodispersed nanoparticle showed that smaller particle made
pressure drop build up more than bigger particle under equal loading mass. The pressure drop
ratio was closed to the ratio of total surface area of particles, alike to micron sized particle
loading by other researchers. The loading curve of bimodal distributions showed different
results.When number concentration of smaller mode particle was lower than larger mode, the
pressure-loading curve was close to larger particle. But when number concentration of
smaller mode particle was higher than larger mode, the pressure-loading curve was close to
smaller particle. This could be explained by whether the void of larger particle cake was fully
filled of smaller particles or not.
Subjects
nanoparticle
Electrospray
bimodal size distribution
aerosol loading
membrane filtration
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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