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Scanning electron microscope (SEM) images of MWNT-7 fibers. a: MWNT-7 fibers at a concentration of 0.2 mg/m3 in the inhalation chamber. MWNT-7 fibers were well dispersed. b: MWNT-7 fibers after digestion of an alveolar macrophage. MWNT-7 fibers form a cocoon-like mass. c: A representative MWNT-7 fiber in the pleural lavage fluid. The MWNT-7 fiber is single, long, and straight. d: A representative MWNT-7 fiber in the peritoneal cavity. The MWNT-7 fiber is single, long, and straight.
