In Situ Structure Characterization of Airborne Carbon Nanofibres by a Tandem Mobility-Mass Analysis

Details

• Personal Author:
  Emery MS ; Ku BK ; Maynard AD ; McMurry PH ; Stolzenburg MR
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Aerosols Air Pollutants, Occupational Occupational Health Particulate Matter Safety Toxicology
• Keywords:
  Aerosol-particles Airborne-fibers Airborne-particles Nanotechnology
• ISSN:
  0957-4484
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  District of Columbia ; Minnesota ; Ohio ; OSHA Region 3 ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DART - Division of Applied Research and Technology
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  17
• Issue:
  14
• NIOSHTIC Number:
  nn:20030709
• Citation:
  Nanotechnology 2006 Jul; 17(14):3613-3621
• Contact Point Address:
  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
• Email:
  BKu@cdc.gov
• Federal Fiscal Year:
  2006
• NORA Priority Area:
  Work Environment and Workforce: Emerging Technologies
• Peer Reviewed:
  True
• Source Full Name:
  Nanotechnology
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:4470be93667d31d10c399a2e4032c7f15137074065e5830d8c1c19afbca49a34e9184b55f5689bff6d9a94508e2861d8bbb811f06c942e435cb0e5f3ebd80044
• Download URL:
  https://stacks.cdc.gov/view/cdc/191234/cdc_191234_DS1.pdf
• File Type:
  [PDF - 1.01 MB ]