Characterization of exposures to nanoscale particles and fibers during solid core drilling of hybrid carbon nanotube advanced composites

Details

• Personal Author:
  Bello D ; Hallock M ; Santeufemio C ; Virji M ; Wardle B ; Yamamoto N ; Zhang J
• Description:
  This work investigated exposures to nanoparticles and nanofibers during solid core drilling of two types of advanced carbon nanotube (CNT)-hybrid composites: (1) reinforced plastic hybrid laminates (alumina fibers and CNT); and (2) graphite-epoxy composites (carbon fibers and CNT). Mutliple real-time instruments were used to characterize the size distribution (5.6 nm to 20 microm), number and mass concentration, particle-bound polyaromatic hydrocarbons (b-PAHs), and surface area of airborne particles at the source and breathing zone. Time-integrated samples included grids for electron microscopy characterization of particle morphology and size resolved (2 nm to 20 microm) samples for the quantification of metals. Several new important findings herein include generation of airborne clusters of CNTs not seen during saw-cutting of similar composites, fewer nanofibers and respirable fibers released, similarly high exposures to nanoparticles with less dependence on the composite thickness, and ultrafine (< 5 nm) aerosol originating from thermal degradation of the composite material. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Dust Environmental Monitoring Epoxy Resins Hydrocarbons Metals Occupational Health Particulate Matter Plastics Polycyclic Aromatic Hydrocarbons Safety Temperature

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• Keywords:
  Air-sampling Air-sampling-techniques Airborne-particles Airborne Exposures Author Keywords: Nanoparticle Breathing-zone CNTs Epoxy-compounds Exposure-assessment Fiber Fibrous-bodies Microscopy Nanocomposites Nanotechnology Occupational Health Particulates Polycyclic-aromatic-hydrocarbons Reinforced-plastics Respirable-dust Thermal-decomposition

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• ISSN:
  1077-3525
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Florida ; OSHA Region 3 ; OSHA Region 4 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DRDS - Division of Respiratory Disease Studies
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  434-450
• Volume:
  16
• Issue:
  4
• NIOSHTIC Number:
  nn:20037917
• Citation:
  Int J Occup Environ Health 2010 Oct-Dec; 16(4):434-450
• CAS Registry Number:
  Alumina (CAS RN 1344-28-1) ; Carbon (CAS RN 7440-44-0) ; Graphite (CAS RN 7782-42-5)
• Federal Fiscal Year:
  2011
• NORA Priority Area:
  Manufacturing
• Peer Reviewed:
  True
• Source Full Name:
  International Journal of Occupational and Environmental Health
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:5530370ea385f5a0d6d428dac70bb3805c43440de85eec7f69545d09cf9aa3a6f85ab48cf10ef217f2d67b7269da7a91f21e3828b8237eebae839264063e4f37
• Download URL:
  https://stacks.cdc.gov/view/cdc/191833/cdc_191833_DS1.pdf
• File Type:
  [PDF - 749.02 KB ]