Bipolar Diffusion Charging Characteristics of Single-Wall Carbon Nanotube Aerosol Particles

Details

• Personal Author:
  Baron, Paul A. ; Deye GJ ; Kulkarni P
• Description:
  Bipolar diffusion charging characteristics of airborne single-wall carbon nanotube (SWCNT) agglomerates were investigated in the mobility diameter range of 100-1000 nm. Neutral fractions of three types of SWCNT aerosols following bipolar charge equilibrium in a radioactive source were experimentally measured to infer their electrical charging characteristics. Significant deviation from Boltzmann and Fuchs stationary charge equilibrium was observed, with neutral fractions of SWCNT particles lower by 30-53% compared to that of spherical particles of the same mobility. Particles with mobility diameter larger than 400 nm showed high electrical charging efficiencies compared to that of mobility-equivalent spherical particles. Higher charging efficiencies of SWCNT particles were attributed to their higher electrical capacitance resulting from complex nonspherical morphologies. Numerical calculations using idealized fiber geometries confirmed the qualitative trend in the experimental data. The electrical capacitance of nanotubes particles deduced from experimentally measured neutral fractions were also found to be higher by a factor ranging from 1.6 to 4.6 compared to that of mobility-equivalent spherical particles, indicating high charge carrying capacity. The charging-equivalent diameters of nanotube particles were computed and were found to be higher than their mobility diameter by a factor of 2.85-4.34. [Description provided by NIOSH]
• Subjects:
  Aerosols Dust Electricity Irritants Occupational Health Particulate Matter Safety
• Keywords:
  Aerosol-particles Dust-analysis Dust-counters Electrical-charge Electrical-properties Nanotechnology Particle-aerodynamics Particle-counters Particulate-dust Particulate-sampling-methods Particulates Radioactive-dusts Respiratory-irritants Statistical-analysis

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• ISSN:
  0021-8502
• 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
• Pages in Document:
  164-179
• Volume:
  40
• Issue:
  2
• NIOSHTIC Number:
  nn:20035082
• Citation:
  J Aerosol Sci 2009 Feb; 40(2):164-179
• Contact Point Address:
  Pramod S. Kulkarni, Cenetr for Disease Control & Prevention, NIOSH, 4676 Columbia Parkway, MS R-3, Cincinnati, OH 45225
• Email:
  PSKulkarni@cdc.gov
• Federal Fiscal Year:
  2009
• NORA Priority Area:
  Manufacturing
• Peer Reviewed:
  True
• Source Full Name:
  Journal of Aerosol Science
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:bf655b0bde2e651f0957ac4675dc77da249c75700817bdf9531d6de99560abeb94e35e12988eeda937aa716039d3219dadced83f51b8148723ae5f16319c421d
• Download URL:
  https://stacks.cdc.gov/view/cdc/187052/cdc_187052_DS1.pdf
• File Type:
  [PDF - 1.04 MB ]