Observation and Measurement of Anomalous Responses in a Differential Mobility Analyzer Caused by Ultrafine Fibrous Carbon Aerosols

Details

• Personal Author:
  Baron, Paul A. ; Deye GJ ; Ku BK ; Maynard AD
• Description:
  We observed anomalous instrument responses above certain voltages when characterizing aggregates of airborne carbon nanotubes or nanofibers using a differential mobility analyzer (DMA). These were associated with sudden increases in measured number concentrations at high voltages, fluctuations in DMA voltage and audible high-frequency sounds from the DMA column. Onset of the anomalies depended on the material forming the aerosol and DMA sampling flow rate. The low density of the nanotubes relative to the nanofibers is thought to be the main reason the anomalous responses occur more easily and strongly with the nanotubes. Two possible mechanisms are suggested to explain the observations. The results indicate that measurement of nanometer-diameter conducting fibrous material by electrical mobility analysis may present a unique challenge. [Description provided by NIOSH]
• Subjects:
  Aerosols Electricity Hearing Manufacturing And Industrial Facilities Noise Noise, Occupational Occupational Health Safety
• Keywords:
  Aerosol-sampling Electric-properties Electrical-conductivity Electrical-measurement Electrical-properties Electrical-stimulation Hearing-acuity Materials-testing Nanotechnology Sound Statistical-analysis Voltage-regulation

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• ISSN:
  0304-3886
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; 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:
  65
• Issue:
  8
• NIOSHTIC Number:
  nn:20031861
• Citation:
  J Electrostat 2007 Jul; 65(8):542-548
• Contact Point Address:
  Centers for Disease Control and Prevention (CDC), National Institute for Occupational Safety and Health (NIOSH), 4676 Columbia Parkway, MS-R3, Cincinnati, OH 45226
• Email:
  BKu@cdc.gov
• Federal Fiscal Year:
  2007
• NORA Priority Area:
  Manufacturing
• Peer Reviewed:
  True
• Source Full Name:
  Journal of Electrostatics
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:bd4541c0450ebe48d2e2d1187da1f796307a1507d5ef1e1e9012f0f747e5c2af3a4fb35412cf86e6d8a8d8007f90dd24b8a34ec23befaea3296a3a2562f7fc3a
• Download URL:
  https://stacks.cdc.gov/view/cdc/185985/cdc_185985_DS1.pdf
• File Type:
  [PDF - 203.97 KB ]