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Representative optical microscopy images of A549 cells exposed for 24 h to CNTs before washing them to remove CNTs dissolved in the medium. (a) Cells exposed to 40 μg/mL of pristine MWCNTs; (b) cells exposed to 40 μg/mL of MWCNT-COOH; (c) control cells. Magnification: 20x. TEM micrographs of pristine MWCNTs (d) and MWCNT-COOH (e) agglomerates/aggregates in RPMI with 10% FBS culture medium (bar 2 μm).
