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. 2006 Mar 31;3(1):48–66. doi: 10.3390/ijerph2006030007

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© 2006 by the authors; licensee MDPI, Basel, Switzerland

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 8: — (a) Typical aggregate of carbon nanotubes and other fullerene polyhedra collected above a kitchen propane gas stove burner. (b) Magnified view of the aggregate in (a) showing a cluster of carbon (concentric) nanoshell structures (A) and a concentric, faceted, polyhedron (p). The SAED pattern insert show the principal graphite (graphene) reflections. The (002) diffraction ring corresponds to graphene (d) spacings of 0.34 nm. The propensity of carbon nanotubes of various length-to-diameter ratios (aspect ratios) relative to fullerene nanopolyhedra is roughly 9-to-1.