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. Author manuscript; available in PMC: 2016 Jan 9.
Published in final edited form as: J Toxicol Environ Health B Crit Rev. 2015;18(0):121–212. doi: 10.1080/10937404.2015.1051611

FIGURE 2. CNF aerosols collected on impactor stages during thermal treatment.

FIGURE 2

Transmission electron microscopy images of airborne CNF size selected by impactors located in a thermal treatment processing area for CNF. Impactor Stage A: 2.5–10 µm; Impactor Stage B: 1.0–2.5 µm; Impactor Stage C: 0.5–1.0 µm; Impactor Stage D: 0.25–0.5. Lacey carbon-coated Ni and SiO-coated Ni grids were used in impactors. (From: Birch et al. 2011).