2010 Fiscal Year Final Research Report
Measurement for length of fiber aerosol using diffusion charging
| Project/Area Number |
21681004
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Environmental impact assessment/Environmental policy
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| Research Institution | National Institute for Environmental Studies |
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Principal Investigator |
FUJITANI Yuji National Institute for Environmental Studies, 環境リスク研究センター, 研究員 (20391154)
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| Project Period (FY) |
2009 – 2010
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| Keywords | 多層カーボンナノチューブ / 繊維長さ / 拡散荷電 / APM / DMA |
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| Research Abstract |
We measured charging efficiency for fibrous multi-walled carbon nanotubes (MWCNT) aerosol and determine the relationship between charging efficiency and fiber length. Charging efficiency was determined by using the EAD and the condensation particle counter for mono-disperse MWCNT aerosol at electrical mobility diameter of 100, 200, 300 nm, respectively. Further, particle morphology (e.g. particle projected equivalent diameter, fiber length, width) was observed with transmission electron microscope. In addition to MWCNT aerosol, mono-disperse diesel particle and polystyrene latex (PSL) particle were measured for reference. The charging efficiency depends on kind of particle at same projected equivalent diameter, and MWCNT aerosol was the highest and 1.5 times higher than that of PSL particle, which suspected that this difference are due to difference of attached surface area. For MWCNT aerosol, the charging efficiency also correlates with fiber length, while no correlates to fiber width, which suggests that charging efficiency determined by using the EAD is well indicator of fiber length.
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