Abstract

This chapter reviews geometry of different classes of carbon nanotubes and examines similarities between carbon nanotubes and asbestos fibers. Geometric parameters of carbon nanotubes are characterized by the aspect ratios and other critical scaling parameters related to the inhalability of carbon nanotubes and their engulfment by macrophages in phagocytosis. Geometric and scaling parameters are used to present a conceptual framework and a parametric map for the extrapolation of potential toxic effects resulting from the inhalation of carbon nanotubes. Similarities between carbon nanotubes and asbestos fibers are also examined by using the Cook’s criteria for the asbestos-like pathologies that can be also caused by microscopic fibers. Scaling parameters for the size effects associated with carbon nanotubes and a new parametric map for the efficiency of phagocytosis are used to evaluate the potential toxicological effects of the inhaled carbon nanotubes from the point of view of the Cook’s criteria for asbestos fibers and other research.

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