Nano Archive

Experimental study of nanoparticles penetration through commercial filter media

Kim, Seong Chan and Harrington, Matthew S. and Pui, David Y. H. (2007) Experimental study of nanoparticles penetration through commercial filter media. JOURNAL OF NANOPARTICLE RESEARCH, 9 (1). pp. 117-125.

Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.

Official URL:


In this study, nanoparticle penetration was measured with a wide range of filter media using silver nanoparticles from 3 nm to 20 nm at three different face velocities in order to define nanoparticle filtration characteristics of commercial fibrous filter media. The silver particles were generated by heating a pure silver powder source via an electric furnace with a temperature of 870 degrees C, which was found to be the optimal temperature for generating an adequate amount of silver nanoparticles for the size range specified above. After size classification using a nano-DMA, the particle counts were measured by an Ultrafine Condensation Particle Counter (UCPC) both upstream and downstream of the test filter to determine the nanoparticle penetration for each specific particle size. Particle sampling time continued long enough to detect more than 10(5) counts at the upstream and 10 counts at the downstream sampling point so that 99.99% efficiency can be detected with the high efficiency filter. The results show a very high uniformity with small error bars for all filter media tested in this study. The particle penetration decreases continuously down to 3 nm as expected from the classical filtration theory, and together with a companion modeling paper by Wang et al. in this same issue, we found no significant evidence of nanoparticle thermal rebound down to 3 nm.

Item Type:Article
Uncontrolled Keywords:nanoparticles; penetration; filtration; thermal rebound; diffusion; occupational health
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
ID Code:2628
Deposited By:Anuj Seth
Deposited On:09 Jan 2009 14:33
Last Modified:20 Jan 2009 11:25

Repository Staff Only: item control page