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

Authors
Bello-D; Wardle-B; Zhang-J; Yamamoto-N; Santeufemio-C; Hallock-M; Virji-M
Source
Int J Occup Environ Health 2010 Oct-Dec; 16(4):434-450
NIOSHTIC No.
20037917
Abstract
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.
Keywords
Nanotechnology; Exposure-assessment; Fibrous-bodies; Particulates; Reinforced-plastics; Epoxy-compounds; Polycyclic-aromatic-hydrocarbons; Airborne-particles; Breathing-zone; Microscopy; Air-sampling; Air-sampling-techniques; Metals; Respirable-dust; Thermal-decomposition; Author Keywords: nanoparticle; nanocomposites; fiber; CNTs; airborne exposures; occupational health; nanotechnology
CODEN
IOEHFU
CAS No.
1344-28-1; 7440-44-0; 7782-42-5
Publication Date
20101001
Document Type
Journal Article
Fiscal Year
2011
NTIS Accession No.
NTIS Price
Issue of Publication
4
ISSN
1077-3525
NIOSH Division
DRDS
Priority Area
Manufacturing
Source Name
International Journal of Occupational and Environmental Health
State
WV; FL
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