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In situ structure characterization of airborne carbon nanofibres by a tandem mobility-mass analysis.

Authors
Ku-BK; Emery-MS; Maynard-AD; Stolzenburg-MR; McMurry-PH
Source
Nanotechnology 2006 Jul; 17(14):3613-3621
NIOSHTIC No.
20030709
Abstract
Carbon nanofibres aerosolized by the agitation of as-produced commercial powder have been characterized in situ by using the differential mobility analyser-aerosol particle mass analyser (DMA-APM) method to determine their structural properties such as the effective density and fractal dimension for toxicology study. The effective density of the aerosolized carbon nanofibres decreased from 1.2 to 0.4 g cm-3 as the mobility diameters increased from 100 to 700 nm, indicating that the carbon nanofibres had open structures with an overall void that increased with increasing diameter, due to increased agglomeration of the nanofibres. This was confirmed by transmission electron microscopy (TEM) observation, showing that 100 nm mobility diameter nanofibres were predominantly single fibres, while doubly or triply attached fibres were seen at mobility diameters of 200 and 400 nm. Effective densities calculated using Cox's theory were in reasonable agreement with experimental values. The mass fractal dimension of the carbon nanofibres was found to be 2.38 over the size range measured and higher than that of single-walled carbon nanotubes (SWCNTs), suggesting that the carbon nanofibres have more compact structure than SWCNTs.
Keywords
Aerosols; Aerosol-particles; Airborne-particles; Airborne-fibers; Toxicology; Nanotechnology
Contact
Bon Ki Ku, Centers for Disease Control and Prevention (CDC), National Institute for Occupational Safety and Health (NIOSH), 4676 Columbia Parkway, MS-R3, Cincinnati, OH 45226, USA
CODEN
NNOTER
Publication Date
20060728
Document Type
Journal Article
Email Address
BKu@cdc.gov
Fiscal Year
2006
NTIS Accession No.
NTIS Price
Issue of Publication
14
ISSN
0957-4484
NIOSH Division
DART
Priority Area
Work Environment and Workforce: Emerging Technologies
Source Name
Nanotechnology
State
OH; MN; DC
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