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

Dhimiter Bello, Brian L. Wardle, Jie Zhang, Namiko Yamamoto, Christopher Santeufemio, Marilyn Hallock, M. Abbas Virji

Research output: Contribution to journalArticle

83 Scopus citations

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). Multiple real-time instruments were used to characterize the size distribution (5.6 nm to 20 ?m), 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 ?m) 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.

Original languageEnglish (US)
Pages (from-to)434-450
Number of pages17
JournalInternational Journal of Occupational and Environmental Health
Volume16
Issue number4
DOIs
StatePublished - 2010

All Science Journal Classification (ASJC) codes

  • Public Health, Environmental and Occupational Health

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