Abstract
The filtration efficiency for nanoparticles down to 1 nm in size through glass fibrous filters was measured using an improved PSM-CNC system. In addition, the effects of relative humidity and particle charge were investigated for various nanoparticle diameters. The results show that the filtration efficiencies were independent of humidity and affected by particle charge in the case of particles below 100 nm in size. For particles smaller than 2 nm, the particle penetrations increased with decreasing particle size. These results suggest that the thermal rebound phenomena would be operative for nanoparticles with diameters below 2 nm, even though it would depend on the states of both the particles and the filter media. These results are particularly important for experimental investigations of the behavior of nanoparticles on a filter.
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Acknowledgements
The authors wish thanks Mr. Jun Katayama (Sharp Co.) for helping the experiment. This study was supported (in part) by funds from the Grant-in-Aid for Scientific Research on Priority Areas under Grant No. 14048216 from Ministry of Education, Culture, Sports, Science and Technology, in Japan and a Grant-in-Aid for Scientific Research (B) (No. 15360413) by Japan Society for the Promotion of Science (JSPS). And this work was supported in part by the New Energy and Industrial Technology Development Organization (NEDO)’s “Nanotechnology Materials Program – Nanotechnology Particle Project” based on funds provided by the Ministry of Economy, Trade and Industry, Japan (METI).
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Kim, C.S., Bao, L., Okuyama, K. et al. Filtration efficiency of a fibrous filter for nanoparticles. J Nanopart Res 8, 215–221 (2006). https://doi.org/10.1007/s11051-005-9017-x
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DOI: https://doi.org/10.1007/s11051-005-9017-x